SelectionDAGBuilder.cpp revision 391016025a72612577cc7b8046fed60bed1aa858
1//===-- SelectionDAGBuilder.cpp - Selection-DAG building ------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This implements routines for translating from LLVM IR into SelectionDAG IR. 11// 12//===----------------------------------------------------------------------===// 13 14#define DEBUG_TYPE "isel" 15#include "SDNodeDbgValue.h" 16#include "SelectionDAGBuilder.h" 17#include "llvm/ADT/BitVector.h" 18#include "llvm/ADT/PostOrderIterator.h" 19#include "llvm/ADT/SmallSet.h" 20#include "llvm/Analysis/AliasAnalysis.h" 21#include "llvm/Analysis/ConstantFolding.h" 22#include "llvm/Constants.h" 23#include "llvm/CallingConv.h" 24#include "llvm/DerivedTypes.h" 25#include "llvm/Function.h" 26#include "llvm/GlobalVariable.h" 27#include "llvm/InlineAsm.h" 28#include "llvm/Instructions.h" 29#include "llvm/Intrinsics.h" 30#include "llvm/IntrinsicInst.h" 31#include "llvm/LLVMContext.h" 32#include "llvm/Module.h" 33#include "llvm/CodeGen/Analysis.h" 34#include "llvm/CodeGen/FastISel.h" 35#include "llvm/CodeGen/FunctionLoweringInfo.h" 36#include "llvm/CodeGen/GCStrategy.h" 37#include "llvm/CodeGen/GCMetadata.h" 38#include "llvm/CodeGen/MachineFunction.h" 39#include "llvm/CodeGen/MachineFrameInfo.h" 40#include "llvm/CodeGen/MachineInstrBuilder.h" 41#include "llvm/CodeGen/MachineJumpTableInfo.h" 42#include "llvm/CodeGen/MachineModuleInfo.h" 43#include "llvm/CodeGen/MachineRegisterInfo.h" 44#include "llvm/CodeGen/SelectionDAG.h" 45#include "llvm/Analysis/DebugInfo.h" 46#include "llvm/Target/TargetData.h" 47#include "llvm/Target/TargetFrameLowering.h" 48#include "llvm/Target/TargetInstrInfo.h" 49#include "llvm/Target/TargetIntrinsicInfo.h" 50#include "llvm/Target/TargetLibraryInfo.h" 51#include "llvm/Target/TargetLowering.h" 52#include "llvm/Target/TargetOptions.h" 53#include "llvm/Support/CommandLine.h" 54#include "llvm/Support/Debug.h" 55#include "llvm/Support/ErrorHandling.h" 56#include "llvm/Support/MathExtras.h" 57#include "llvm/Support/raw_ostream.h" 58#include <algorithm> 59using namespace llvm; 60 61/// LimitFloatPrecision - Generate low-precision inline sequences for 62/// some float libcalls (6, 8 or 12 bits). 63static unsigned LimitFloatPrecision; 64 65static cl::opt<unsigned, true> 66LimitFPPrecision("limit-float-precision", 67 cl::desc("Generate low-precision inline sequences " 68 "for some float libcalls"), 69 cl::location(LimitFloatPrecision), 70 cl::init(0)); 71 72// Limit the width of DAG chains. This is important in general to prevent 73// prevent DAG-based analysis from blowing up. For example, alias analysis and 74// load clustering may not complete in reasonable time. It is difficult to 75// recognize and avoid this situation within each individual analysis, and 76// future analyses are likely to have the same behavior. Limiting DAG width is 77// the safe approach, and will be especially important with global DAGs. 78// 79// MaxParallelChains default is arbitrarily high to avoid affecting 80// optimization, but could be lowered to improve compile time. Any ld-ld-st-st 81// sequence over this should have been converted to llvm.memcpy by the 82// frontend. It easy to induce this behavior with .ll code such as: 83// %buffer = alloca [4096 x i8] 84// %data = load [4096 x i8]* %argPtr 85// store [4096 x i8] %data, [4096 x i8]* %buffer 86static const unsigned MaxParallelChains = 64; 87 88static SDValue getCopyFromPartsVector(SelectionDAG &DAG, DebugLoc DL, 89 const SDValue *Parts, unsigned NumParts, 90 EVT PartVT, EVT ValueVT); 91 92/// getCopyFromParts - Create a value that contains the specified legal parts 93/// combined into the value they represent. If the parts combine to a type 94/// larger then ValueVT then AssertOp can be used to specify whether the extra 95/// bits are known to be zero (ISD::AssertZext) or sign extended from ValueVT 96/// (ISD::AssertSext). 97static SDValue getCopyFromParts(SelectionDAG &DAG, DebugLoc DL, 98 const SDValue *Parts, 99 unsigned NumParts, EVT PartVT, EVT ValueVT, 100 ISD::NodeType AssertOp = ISD::DELETED_NODE) { 101 if (ValueVT.isVector()) 102 return getCopyFromPartsVector(DAG, DL, Parts, NumParts, PartVT, ValueVT); 103 104 assert(NumParts > 0 && "No parts to assemble!"); 105 const TargetLowering &TLI = DAG.getTargetLoweringInfo(); 106 SDValue Val = Parts[0]; 107 108 if (NumParts > 1) { 109 // Assemble the value from multiple parts. 110 if (ValueVT.isInteger()) { 111 unsigned PartBits = PartVT.getSizeInBits(); 112 unsigned ValueBits = ValueVT.getSizeInBits(); 113 114 // Assemble the power of 2 part. 115 unsigned RoundParts = NumParts & (NumParts - 1) ? 116 1 << Log2_32(NumParts) : NumParts; 117 unsigned RoundBits = PartBits * RoundParts; 118 EVT RoundVT = RoundBits == ValueBits ? 119 ValueVT : EVT::getIntegerVT(*DAG.getContext(), RoundBits); 120 SDValue Lo, Hi; 121 122 EVT HalfVT = EVT::getIntegerVT(*DAG.getContext(), RoundBits/2); 123 124 if (RoundParts > 2) { 125 Lo = getCopyFromParts(DAG, DL, Parts, RoundParts / 2, 126 PartVT, HalfVT); 127 Hi = getCopyFromParts(DAG, DL, Parts + RoundParts / 2, 128 RoundParts / 2, PartVT, HalfVT); 129 } else { 130 Lo = DAG.getNode(ISD::BITCAST, DL, HalfVT, Parts[0]); 131 Hi = DAG.getNode(ISD::BITCAST, DL, HalfVT, Parts[1]); 132 } 133 134 if (TLI.isBigEndian()) 135 std::swap(Lo, Hi); 136 137 Val = DAG.getNode(ISD::BUILD_PAIR, DL, RoundVT, Lo, Hi); 138 139 if (RoundParts < NumParts) { 140 // Assemble the trailing non-power-of-2 part. 141 unsigned OddParts = NumParts - RoundParts; 142 EVT OddVT = EVT::getIntegerVT(*DAG.getContext(), OddParts * PartBits); 143 Hi = getCopyFromParts(DAG, DL, 144 Parts + RoundParts, OddParts, PartVT, OddVT); 145 146 // Combine the round and odd parts. 147 Lo = Val; 148 if (TLI.isBigEndian()) 149 std::swap(Lo, Hi); 150 EVT TotalVT = EVT::getIntegerVT(*DAG.getContext(), NumParts * PartBits); 151 Hi = DAG.getNode(ISD::ANY_EXTEND, DL, TotalVT, Hi); 152 Hi = DAG.getNode(ISD::SHL, DL, TotalVT, Hi, 153 DAG.getConstant(Lo.getValueType().getSizeInBits(), 154 TLI.getPointerTy())); 155 Lo = DAG.getNode(ISD::ZERO_EXTEND, DL, TotalVT, Lo); 156 Val = DAG.getNode(ISD::OR, DL, TotalVT, Lo, Hi); 157 } 158 } else if (PartVT.isFloatingPoint()) { 159 // FP split into multiple FP parts (for ppcf128) 160 assert(ValueVT == EVT(MVT::ppcf128) && PartVT == EVT(MVT::f64) && 161 "Unexpected split"); 162 SDValue Lo, Hi; 163 Lo = DAG.getNode(ISD::BITCAST, DL, EVT(MVT::f64), Parts[0]); 164 Hi = DAG.getNode(ISD::BITCAST, DL, EVT(MVT::f64), Parts[1]); 165 if (TLI.isBigEndian()) 166 std::swap(Lo, Hi); 167 Val = DAG.getNode(ISD::BUILD_PAIR, DL, ValueVT, Lo, Hi); 168 } else { 169 // FP split into integer parts (soft fp) 170 assert(ValueVT.isFloatingPoint() && PartVT.isInteger() && 171 !PartVT.isVector() && "Unexpected split"); 172 EVT IntVT = EVT::getIntegerVT(*DAG.getContext(), ValueVT.getSizeInBits()); 173 Val = getCopyFromParts(DAG, DL, Parts, NumParts, PartVT, IntVT); 174 } 175 } 176 177 // There is now one part, held in Val. Correct it to match ValueVT. 178 PartVT = Val.getValueType(); 179 180 if (PartVT == ValueVT) 181 return Val; 182 183 if (PartVT.isInteger() && ValueVT.isInteger()) { 184 if (ValueVT.bitsLT(PartVT)) { 185 // For a truncate, see if we have any information to 186 // indicate whether the truncated bits will always be 187 // zero or sign-extension. 188 if (AssertOp != ISD::DELETED_NODE) 189 Val = DAG.getNode(AssertOp, DL, PartVT, Val, 190 DAG.getValueType(ValueVT)); 191 return DAG.getNode(ISD::TRUNCATE, DL, ValueVT, Val); 192 } 193 return DAG.getNode(ISD::ANY_EXTEND, DL, ValueVT, Val); 194 } 195 196 if (PartVT.isFloatingPoint() && ValueVT.isFloatingPoint()) { 197 // FP_ROUND's are always exact here. 198 if (ValueVT.bitsLT(Val.getValueType())) 199 return DAG.getNode(ISD::FP_ROUND, DL, ValueVT, Val, 200 DAG.getTargetConstant(1, TLI.getPointerTy())); 201 202 return DAG.getNode(ISD::FP_EXTEND, DL, ValueVT, Val); 203 } 204 205 if (PartVT.getSizeInBits() == ValueVT.getSizeInBits()) 206 return DAG.getNode(ISD::BITCAST, DL, ValueVT, Val); 207 208 llvm_unreachable("Unknown mismatch!"); 209} 210 211/// getCopyFromParts - Create a value that contains the specified legal parts 212/// combined into the value they represent. If the parts combine to a type 213/// larger then ValueVT then AssertOp can be used to specify whether the extra 214/// bits are known to be zero (ISD::AssertZext) or sign extended from ValueVT 215/// (ISD::AssertSext). 216static SDValue getCopyFromPartsVector(SelectionDAG &DAG, DebugLoc DL, 217 const SDValue *Parts, unsigned NumParts, 218 EVT PartVT, EVT ValueVT) { 219 assert(ValueVT.isVector() && "Not a vector value"); 220 assert(NumParts > 0 && "No parts to assemble!"); 221 const TargetLowering &TLI = DAG.getTargetLoweringInfo(); 222 SDValue Val = Parts[0]; 223 224 // Handle a multi-element vector. 225 if (NumParts > 1) { 226 EVT IntermediateVT, RegisterVT; 227 unsigned NumIntermediates; 228 unsigned NumRegs = 229 TLI.getVectorTypeBreakdown(*DAG.getContext(), ValueVT, IntermediateVT, 230 NumIntermediates, RegisterVT); 231 assert(NumRegs == NumParts && "Part count doesn't match vector breakdown!"); 232 NumParts = NumRegs; // Silence a compiler warning. 233 assert(RegisterVT == PartVT && "Part type doesn't match vector breakdown!"); 234 assert(RegisterVT == Parts[0].getValueType() && 235 "Part type doesn't match part!"); 236 237 // Assemble the parts into intermediate operands. 238 SmallVector<SDValue, 8> Ops(NumIntermediates); 239 if (NumIntermediates == NumParts) { 240 // If the register was not expanded, truncate or copy the value, 241 // as appropriate. 242 for (unsigned i = 0; i != NumParts; ++i) 243 Ops[i] = getCopyFromParts(DAG, DL, &Parts[i], 1, 244 PartVT, IntermediateVT); 245 } else if (NumParts > 0) { 246 // If the intermediate type was expanded, build the intermediate 247 // operands from the parts. 248 assert(NumParts % NumIntermediates == 0 && 249 "Must expand into a divisible number of parts!"); 250 unsigned Factor = NumParts / NumIntermediates; 251 for (unsigned i = 0; i != NumIntermediates; ++i) 252 Ops[i] = getCopyFromParts(DAG, DL, &Parts[i * Factor], Factor, 253 PartVT, IntermediateVT); 254 } 255 256 // Build a vector with BUILD_VECTOR or CONCAT_VECTORS from the 257 // intermediate operands. 258 Val = DAG.getNode(IntermediateVT.isVector() ? 259 ISD::CONCAT_VECTORS : ISD::BUILD_VECTOR, DL, 260 ValueVT, &Ops[0], NumIntermediates); 261 } 262 263 // There is now one part, held in Val. Correct it to match ValueVT. 264 PartVT = Val.getValueType(); 265 266 if (PartVT == ValueVT) 267 return Val; 268 269 if (PartVT.isVector()) { 270 // If the element type of the source/dest vectors are the same, but the 271 // parts vector has more elements than the value vector, then we have a 272 // vector widening case (e.g. <2 x float> -> <4 x float>). Extract the 273 // elements we want. 274 if (PartVT.getVectorElementType() == ValueVT.getVectorElementType()) { 275 assert(PartVT.getVectorNumElements() > ValueVT.getVectorNumElements() && 276 "Cannot narrow, it would be a lossy transformation"); 277 return DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, ValueVT, Val, 278 DAG.getIntPtrConstant(0)); 279 } 280 281 // Vector/Vector bitcast. 282 if (ValueVT.getSizeInBits() == PartVT.getSizeInBits()) 283 return DAG.getNode(ISD::BITCAST, DL, ValueVT, Val); 284 285 assert(PartVT.getVectorNumElements() == ValueVT.getVectorNumElements() && 286 "Cannot handle this kind of promotion"); 287 // Promoted vector extract 288 bool Smaller = ValueVT.bitsLE(PartVT); 289 return DAG.getNode((Smaller ? ISD::TRUNCATE : ISD::ANY_EXTEND), 290 DL, ValueVT, Val); 291 292 } 293 294 // Trivial bitcast if the types are the same size and the destination 295 // vector type is legal. 296 if (PartVT.getSizeInBits() == ValueVT.getSizeInBits() && 297 TLI.isTypeLegal(ValueVT)) 298 return DAG.getNode(ISD::BITCAST, DL, ValueVT, Val); 299 300 // Handle cases such as i8 -> <1 x i1> 301 assert(ValueVT.getVectorNumElements() == 1 && 302 "Only trivial scalar-to-vector conversions should get here!"); 303 304 if (ValueVT.getVectorNumElements() == 1 && 305 ValueVT.getVectorElementType() != PartVT) { 306 bool Smaller = ValueVT.bitsLE(PartVT); 307 Val = DAG.getNode((Smaller ? ISD::TRUNCATE : ISD::ANY_EXTEND), 308 DL, ValueVT.getScalarType(), Val); 309 } 310 311 return DAG.getNode(ISD::BUILD_VECTOR, DL, ValueVT, Val); 312} 313 314 315 316 317static void getCopyToPartsVector(SelectionDAG &DAG, DebugLoc dl, 318 SDValue Val, SDValue *Parts, unsigned NumParts, 319 EVT PartVT); 320 321/// getCopyToParts - Create a series of nodes that contain the specified value 322/// split into legal parts. If the parts contain more bits than Val, then, for 323/// integers, ExtendKind can be used to specify how to generate the extra bits. 324static void getCopyToParts(SelectionDAG &DAG, DebugLoc DL, 325 SDValue Val, SDValue *Parts, unsigned NumParts, 326 EVT PartVT, 327 ISD::NodeType ExtendKind = ISD::ANY_EXTEND) { 328 EVT ValueVT = Val.getValueType(); 329 330 // Handle the vector case separately. 331 if (ValueVT.isVector()) 332 return getCopyToPartsVector(DAG, DL, Val, Parts, NumParts, PartVT); 333 334 const TargetLowering &TLI = DAG.getTargetLoweringInfo(); 335 unsigned PartBits = PartVT.getSizeInBits(); 336 unsigned OrigNumParts = NumParts; 337 assert(TLI.isTypeLegal(PartVT) && "Copying to an illegal type!"); 338 339 if (NumParts == 0) 340 return; 341 342 assert(!ValueVT.isVector() && "Vector case handled elsewhere"); 343 if (PartVT == ValueVT) { 344 assert(NumParts == 1 && "No-op copy with multiple parts!"); 345 Parts[0] = Val; 346 return; 347 } 348 349 if (NumParts * PartBits > ValueVT.getSizeInBits()) { 350 // If the parts cover more bits than the value has, promote the value. 351 if (PartVT.isFloatingPoint() && ValueVT.isFloatingPoint()) { 352 assert(NumParts == 1 && "Do not know what to promote to!"); 353 Val = DAG.getNode(ISD::FP_EXTEND, DL, PartVT, Val); 354 } else { 355 assert((PartVT.isInteger() || PartVT == MVT::x86mmx) && 356 ValueVT.isInteger() && 357 "Unknown mismatch!"); 358 ValueVT = EVT::getIntegerVT(*DAG.getContext(), NumParts * PartBits); 359 Val = DAG.getNode(ExtendKind, DL, ValueVT, Val); 360 if (PartVT == MVT::x86mmx) 361 Val = DAG.getNode(ISD::BITCAST, DL, PartVT, Val); 362 } 363 } else if (PartBits == ValueVT.getSizeInBits()) { 364 // Different types of the same size. 365 assert(NumParts == 1 && PartVT != ValueVT); 366 Val = DAG.getNode(ISD::BITCAST, DL, PartVT, Val); 367 } else if (NumParts * PartBits < ValueVT.getSizeInBits()) { 368 // If the parts cover less bits than value has, truncate the value. 369 assert((PartVT.isInteger() || PartVT == MVT::x86mmx) && 370 ValueVT.isInteger() && 371 "Unknown mismatch!"); 372 ValueVT = EVT::getIntegerVT(*DAG.getContext(), NumParts * PartBits); 373 Val = DAG.getNode(ISD::TRUNCATE, DL, ValueVT, Val); 374 if (PartVT == MVT::x86mmx) 375 Val = DAG.getNode(ISD::BITCAST, DL, PartVT, Val); 376 } 377 378 // The value may have changed - recompute ValueVT. 379 ValueVT = Val.getValueType(); 380 assert(NumParts * PartBits == ValueVT.getSizeInBits() && 381 "Failed to tile the value with PartVT!"); 382 383 if (NumParts == 1) { 384 assert(PartVT == ValueVT && "Type conversion failed!"); 385 Parts[0] = Val; 386 return; 387 } 388 389 // Expand the value into multiple parts. 390 if (NumParts & (NumParts - 1)) { 391 // The number of parts is not a power of 2. Split off and copy the tail. 392 assert(PartVT.isInteger() && ValueVT.isInteger() && 393 "Do not know what to expand to!"); 394 unsigned RoundParts = 1 << Log2_32(NumParts); 395 unsigned RoundBits = RoundParts * PartBits; 396 unsigned OddParts = NumParts - RoundParts; 397 SDValue OddVal = DAG.getNode(ISD::SRL, DL, ValueVT, Val, 398 DAG.getIntPtrConstant(RoundBits)); 399 getCopyToParts(DAG, DL, OddVal, Parts + RoundParts, OddParts, PartVT); 400 401 if (TLI.isBigEndian()) 402 // The odd parts were reversed by getCopyToParts - unreverse them. 403 std::reverse(Parts + RoundParts, Parts + NumParts); 404 405 NumParts = RoundParts; 406 ValueVT = EVT::getIntegerVT(*DAG.getContext(), NumParts * PartBits); 407 Val = DAG.getNode(ISD::TRUNCATE, DL, ValueVT, Val); 408 } 409 410 // The number of parts is a power of 2. Repeatedly bisect the value using 411 // EXTRACT_ELEMENT. 412 Parts[0] = DAG.getNode(ISD::BITCAST, DL, 413 EVT::getIntegerVT(*DAG.getContext(), 414 ValueVT.getSizeInBits()), 415 Val); 416 417 for (unsigned StepSize = NumParts; StepSize > 1; StepSize /= 2) { 418 for (unsigned i = 0; i < NumParts; i += StepSize) { 419 unsigned ThisBits = StepSize * PartBits / 2; 420 EVT ThisVT = EVT::getIntegerVT(*DAG.getContext(), ThisBits); 421 SDValue &Part0 = Parts[i]; 422 SDValue &Part1 = Parts[i+StepSize/2]; 423 424 Part1 = DAG.getNode(ISD::EXTRACT_ELEMENT, DL, 425 ThisVT, Part0, DAG.getIntPtrConstant(1)); 426 Part0 = DAG.getNode(ISD::EXTRACT_ELEMENT, DL, 427 ThisVT, Part0, DAG.getIntPtrConstant(0)); 428 429 if (ThisBits == PartBits && ThisVT != PartVT) { 430 Part0 = DAG.getNode(ISD::BITCAST, DL, PartVT, Part0); 431 Part1 = DAG.getNode(ISD::BITCAST, DL, PartVT, Part1); 432 } 433 } 434 } 435 436 if (TLI.isBigEndian()) 437 std::reverse(Parts, Parts + OrigNumParts); 438} 439 440 441/// getCopyToPartsVector - Create a series of nodes that contain the specified 442/// value split into legal parts. 443static void getCopyToPartsVector(SelectionDAG &DAG, DebugLoc DL, 444 SDValue Val, SDValue *Parts, unsigned NumParts, 445 EVT PartVT) { 446 EVT ValueVT = Val.getValueType(); 447 assert(ValueVT.isVector() && "Not a vector"); 448 const TargetLowering &TLI = DAG.getTargetLoweringInfo(); 449 450 if (NumParts == 1) { 451 if (PartVT == ValueVT) { 452 // Nothing to do. 453 } else if (PartVT.getSizeInBits() == ValueVT.getSizeInBits()) { 454 // Bitconvert vector->vector case. 455 Val = DAG.getNode(ISD::BITCAST, DL, PartVT, Val); 456 } else if (PartVT.isVector() && 457 PartVT.getVectorElementType() == ValueVT.getVectorElementType() && 458 PartVT.getVectorNumElements() > ValueVT.getVectorNumElements()) { 459 EVT ElementVT = PartVT.getVectorElementType(); 460 // Vector widening case, e.g. <2 x float> -> <4 x float>. Shuffle in 461 // undef elements. 462 SmallVector<SDValue, 16> Ops; 463 for (unsigned i = 0, e = ValueVT.getVectorNumElements(); i != e; ++i) 464 Ops.push_back(DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, 465 ElementVT, Val, DAG.getIntPtrConstant(i))); 466 467 for (unsigned i = ValueVT.getVectorNumElements(), 468 e = PartVT.getVectorNumElements(); i != e; ++i) 469 Ops.push_back(DAG.getUNDEF(ElementVT)); 470 471 Val = DAG.getNode(ISD::BUILD_VECTOR, DL, PartVT, &Ops[0], Ops.size()); 472 473 // FIXME: Use CONCAT for 2x -> 4x. 474 475 //SDValue UndefElts = DAG.getUNDEF(VectorTy); 476 //Val = DAG.getNode(ISD::CONCAT_VECTORS, DL, PartVT, Val, UndefElts); 477 } else if (PartVT.isVector() && 478 PartVT.getVectorElementType().bitsGE( 479 ValueVT.getVectorElementType()) && 480 PartVT.getVectorNumElements() == ValueVT.getVectorNumElements()) { 481 482 // Promoted vector extract 483 bool Smaller = PartVT.bitsLE(ValueVT); 484 Val = DAG.getNode((Smaller ? ISD::TRUNCATE : ISD::ANY_EXTEND), 485 DL, PartVT, Val); 486 } else{ 487 // Vector -> scalar conversion. 488 assert(ValueVT.getVectorNumElements() == 1 && 489 "Only trivial vector-to-scalar conversions should get here!"); 490 Val = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, 491 PartVT, Val, DAG.getIntPtrConstant(0)); 492 493 bool Smaller = ValueVT.bitsLE(PartVT); 494 Val = DAG.getNode((Smaller ? ISD::TRUNCATE : ISD::ANY_EXTEND), 495 DL, PartVT, Val); 496 } 497 498 Parts[0] = Val; 499 return; 500 } 501 502 // Handle a multi-element vector. 503 EVT IntermediateVT, RegisterVT; 504 unsigned NumIntermediates; 505 unsigned NumRegs = TLI.getVectorTypeBreakdown(*DAG.getContext(), ValueVT, 506 IntermediateVT, 507 NumIntermediates, RegisterVT); 508 unsigned NumElements = ValueVT.getVectorNumElements(); 509 510 assert(NumRegs == NumParts && "Part count doesn't match vector breakdown!"); 511 NumParts = NumRegs; // Silence a compiler warning. 512 assert(RegisterVT == PartVT && "Part type doesn't match vector breakdown!"); 513 514 // Split the vector into intermediate operands. 515 SmallVector<SDValue, 8> Ops(NumIntermediates); 516 for (unsigned i = 0; i != NumIntermediates; ++i) { 517 if (IntermediateVT.isVector()) 518 Ops[i] = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, 519 IntermediateVT, Val, 520 DAG.getIntPtrConstant(i * (NumElements / NumIntermediates))); 521 else 522 Ops[i] = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, 523 IntermediateVT, Val, DAG.getIntPtrConstant(i)); 524 } 525 526 // Split the intermediate operands into legal parts. 527 if (NumParts == NumIntermediates) { 528 // If the register was not expanded, promote or copy the value, 529 // as appropriate. 530 for (unsigned i = 0; i != NumParts; ++i) 531 getCopyToParts(DAG, DL, Ops[i], &Parts[i], 1, PartVT); 532 } else if (NumParts > 0) { 533 // If the intermediate type was expanded, split each the value into 534 // legal parts. 535 assert(NumParts % NumIntermediates == 0 && 536 "Must expand into a divisible number of parts!"); 537 unsigned Factor = NumParts / NumIntermediates; 538 for (unsigned i = 0; i != NumIntermediates; ++i) 539 getCopyToParts(DAG, DL, Ops[i], &Parts[i*Factor], Factor, PartVT); 540 } 541} 542 543 544 545 546namespace { 547 /// RegsForValue - This struct represents the registers (physical or virtual) 548 /// that a particular set of values is assigned, and the type information 549 /// about the value. The most common situation is to represent one value at a 550 /// time, but struct or array values are handled element-wise as multiple 551 /// values. The splitting of aggregates is performed recursively, so that we 552 /// never have aggregate-typed registers. The values at this point do not 553 /// necessarily have legal types, so each value may require one or more 554 /// registers of some legal type. 555 /// 556 struct RegsForValue { 557 /// ValueVTs - The value types of the values, which may not be legal, and 558 /// may need be promoted or synthesized from one or more registers. 559 /// 560 SmallVector<EVT, 4> ValueVTs; 561 562 /// RegVTs - The value types of the registers. This is the same size as 563 /// ValueVTs and it records, for each value, what the type of the assigned 564 /// register or registers are. (Individual values are never synthesized 565 /// from more than one type of register.) 566 /// 567 /// With virtual registers, the contents of RegVTs is redundant with TLI's 568 /// getRegisterType member function, however when with physical registers 569 /// it is necessary to have a separate record of the types. 570 /// 571 SmallVector<EVT, 4> RegVTs; 572 573 /// Regs - This list holds the registers assigned to the values. 574 /// Each legal or promoted value requires one register, and each 575 /// expanded value requires multiple registers. 576 /// 577 SmallVector<unsigned, 4> Regs; 578 579 RegsForValue() {} 580 581 RegsForValue(const SmallVector<unsigned, 4> ®s, 582 EVT regvt, EVT valuevt) 583 : ValueVTs(1, valuevt), RegVTs(1, regvt), Regs(regs) {} 584 585 RegsForValue(LLVMContext &Context, const TargetLowering &tli, 586 unsigned Reg, Type *Ty) { 587 ComputeValueVTs(tli, Ty, ValueVTs); 588 589 for (unsigned Value = 0, e = ValueVTs.size(); Value != e; ++Value) { 590 EVT ValueVT = ValueVTs[Value]; 591 unsigned NumRegs = tli.getNumRegisters(Context, ValueVT); 592 EVT RegisterVT = tli.getRegisterType(Context, ValueVT); 593 for (unsigned i = 0; i != NumRegs; ++i) 594 Regs.push_back(Reg + i); 595 RegVTs.push_back(RegisterVT); 596 Reg += NumRegs; 597 } 598 } 599 600 /// areValueTypesLegal - Return true if types of all the values are legal. 601 bool areValueTypesLegal(const TargetLowering &TLI) { 602 for (unsigned Value = 0, e = ValueVTs.size(); Value != e; ++Value) { 603 EVT RegisterVT = RegVTs[Value]; 604 if (!TLI.isTypeLegal(RegisterVT)) 605 return false; 606 } 607 return true; 608 } 609 610 /// append - Add the specified values to this one. 611 void append(const RegsForValue &RHS) { 612 ValueVTs.append(RHS.ValueVTs.begin(), RHS.ValueVTs.end()); 613 RegVTs.append(RHS.RegVTs.begin(), RHS.RegVTs.end()); 614 Regs.append(RHS.Regs.begin(), RHS.Regs.end()); 615 } 616 617 /// getCopyFromRegs - Emit a series of CopyFromReg nodes that copies from 618 /// this value and returns the result as a ValueVTs value. This uses 619 /// Chain/Flag as the input and updates them for the output Chain/Flag. 620 /// If the Flag pointer is NULL, no flag is used. 621 SDValue getCopyFromRegs(SelectionDAG &DAG, FunctionLoweringInfo &FuncInfo, 622 DebugLoc dl, 623 SDValue &Chain, SDValue *Flag) const; 624 625 /// getCopyToRegs - Emit a series of CopyToReg nodes that copies the 626 /// specified value into the registers specified by this object. This uses 627 /// Chain/Flag as the input and updates them for the output Chain/Flag. 628 /// If the Flag pointer is NULL, no flag is used. 629 void getCopyToRegs(SDValue Val, SelectionDAG &DAG, DebugLoc dl, 630 SDValue &Chain, SDValue *Flag) const; 631 632 /// AddInlineAsmOperands - Add this value to the specified inlineasm node 633 /// operand list. This adds the code marker, matching input operand index 634 /// (if applicable), and includes the number of values added into it. 635 void AddInlineAsmOperands(unsigned Kind, 636 bool HasMatching, unsigned MatchingIdx, 637 SelectionDAG &DAG, 638 std::vector<SDValue> &Ops) const; 639 }; 640} 641 642/// getCopyFromRegs - Emit a series of CopyFromReg nodes that copies from 643/// this value and returns the result as a ValueVT value. This uses 644/// Chain/Flag as the input and updates them for the output Chain/Flag. 645/// If the Flag pointer is NULL, no flag is used. 646SDValue RegsForValue::getCopyFromRegs(SelectionDAG &DAG, 647 FunctionLoweringInfo &FuncInfo, 648 DebugLoc dl, 649 SDValue &Chain, SDValue *Flag) const { 650 // A Value with type {} or [0 x %t] needs no registers. 651 if (ValueVTs.empty()) 652 return SDValue(); 653 654 const TargetLowering &TLI = DAG.getTargetLoweringInfo(); 655 656 // Assemble the legal parts into the final values. 657 SmallVector<SDValue, 4> Values(ValueVTs.size()); 658 SmallVector<SDValue, 8> Parts; 659 for (unsigned Value = 0, Part = 0, e = ValueVTs.size(); Value != e; ++Value) { 660 // Copy the legal parts from the registers. 661 EVT ValueVT = ValueVTs[Value]; 662 unsigned NumRegs = TLI.getNumRegisters(*DAG.getContext(), ValueVT); 663 EVT RegisterVT = RegVTs[Value]; 664 665 Parts.resize(NumRegs); 666 for (unsigned i = 0; i != NumRegs; ++i) { 667 SDValue P; 668 if (Flag == 0) { 669 P = DAG.getCopyFromReg(Chain, dl, Regs[Part+i], RegisterVT); 670 } else { 671 P = DAG.getCopyFromReg(Chain, dl, Regs[Part+i], RegisterVT, *Flag); 672 *Flag = P.getValue(2); 673 } 674 675 Chain = P.getValue(1); 676 Parts[i] = P; 677 678 // If the source register was virtual and if we know something about it, 679 // add an assert node. 680 if (!TargetRegisterInfo::isVirtualRegister(Regs[Part+i]) || 681 !RegisterVT.isInteger() || RegisterVT.isVector()) 682 continue; 683 684 const FunctionLoweringInfo::LiveOutInfo *LOI = 685 FuncInfo.GetLiveOutRegInfo(Regs[Part+i]); 686 if (!LOI) 687 continue; 688 689 unsigned RegSize = RegisterVT.getSizeInBits(); 690 unsigned NumSignBits = LOI->NumSignBits; 691 unsigned NumZeroBits = LOI->KnownZero.countLeadingOnes(); 692 693 // FIXME: We capture more information than the dag can represent. For 694 // now, just use the tightest assertzext/assertsext possible. 695 bool isSExt = true; 696 EVT FromVT(MVT::Other); 697 if (NumSignBits == RegSize) 698 isSExt = true, FromVT = MVT::i1; // ASSERT SEXT 1 699 else if (NumZeroBits >= RegSize-1) 700 isSExt = false, FromVT = MVT::i1; // ASSERT ZEXT 1 701 else if (NumSignBits > RegSize-8) 702 isSExt = true, FromVT = MVT::i8; // ASSERT SEXT 8 703 else if (NumZeroBits >= RegSize-8) 704 isSExt = false, FromVT = MVT::i8; // ASSERT ZEXT 8 705 else if (NumSignBits > RegSize-16) 706 isSExt = true, FromVT = MVT::i16; // ASSERT SEXT 16 707 else if (NumZeroBits >= RegSize-16) 708 isSExt = false, FromVT = MVT::i16; // ASSERT ZEXT 16 709 else if (NumSignBits > RegSize-32) 710 isSExt = true, FromVT = MVT::i32; // ASSERT SEXT 32 711 else if (NumZeroBits >= RegSize-32) 712 isSExt = false, FromVT = MVT::i32; // ASSERT ZEXT 32 713 else 714 continue; 715 716 // Add an assertion node. 717 assert(FromVT != MVT::Other); 718 Parts[i] = DAG.getNode(isSExt ? ISD::AssertSext : ISD::AssertZext, dl, 719 RegisterVT, P, DAG.getValueType(FromVT)); 720 } 721 722 Values[Value] = getCopyFromParts(DAG, dl, Parts.begin(), 723 NumRegs, RegisterVT, ValueVT); 724 Part += NumRegs; 725 Parts.clear(); 726 } 727 728 return DAG.getNode(ISD::MERGE_VALUES, dl, 729 DAG.getVTList(&ValueVTs[0], ValueVTs.size()), 730 &Values[0], ValueVTs.size()); 731} 732 733/// getCopyToRegs - Emit a series of CopyToReg nodes that copies the 734/// specified value into the registers specified by this object. This uses 735/// Chain/Flag as the input and updates them for the output Chain/Flag. 736/// If the Flag pointer is NULL, no flag is used. 737void RegsForValue::getCopyToRegs(SDValue Val, SelectionDAG &DAG, DebugLoc dl, 738 SDValue &Chain, SDValue *Flag) const { 739 const TargetLowering &TLI = DAG.getTargetLoweringInfo(); 740 741 // Get the list of the values's legal parts. 742 unsigned NumRegs = Regs.size(); 743 SmallVector<SDValue, 8> Parts(NumRegs); 744 for (unsigned Value = 0, Part = 0, e = ValueVTs.size(); Value != e; ++Value) { 745 EVT ValueVT = ValueVTs[Value]; 746 unsigned NumParts = TLI.getNumRegisters(*DAG.getContext(), ValueVT); 747 EVT RegisterVT = RegVTs[Value]; 748 749 getCopyToParts(DAG, dl, Val.getValue(Val.getResNo() + Value), 750 &Parts[Part], NumParts, RegisterVT); 751 Part += NumParts; 752 } 753 754 // Copy the parts into the registers. 755 SmallVector<SDValue, 8> Chains(NumRegs); 756 for (unsigned i = 0; i != NumRegs; ++i) { 757 SDValue Part; 758 if (Flag == 0) { 759 Part = DAG.getCopyToReg(Chain, dl, Regs[i], Parts[i]); 760 } else { 761 Part = DAG.getCopyToReg(Chain, dl, Regs[i], Parts[i], *Flag); 762 *Flag = Part.getValue(1); 763 } 764 765 Chains[i] = Part.getValue(0); 766 } 767 768 if (NumRegs == 1 || Flag) 769 // If NumRegs > 1 && Flag is used then the use of the last CopyToReg is 770 // flagged to it. That is the CopyToReg nodes and the user are considered 771 // a single scheduling unit. If we create a TokenFactor and return it as 772 // chain, then the TokenFactor is both a predecessor (operand) of the 773 // user as well as a successor (the TF operands are flagged to the user). 774 // c1, f1 = CopyToReg 775 // c2, f2 = CopyToReg 776 // c3 = TokenFactor c1, c2 777 // ... 778 // = op c3, ..., f2 779 Chain = Chains[NumRegs-1]; 780 else 781 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &Chains[0], NumRegs); 782} 783 784/// AddInlineAsmOperands - Add this value to the specified inlineasm node 785/// operand list. This adds the code marker and includes the number of 786/// values added into it. 787void RegsForValue::AddInlineAsmOperands(unsigned Code, bool HasMatching, 788 unsigned MatchingIdx, 789 SelectionDAG &DAG, 790 std::vector<SDValue> &Ops) const { 791 const TargetLowering &TLI = DAG.getTargetLoweringInfo(); 792 793 unsigned Flag = InlineAsm::getFlagWord(Code, Regs.size()); 794 if (HasMatching) 795 Flag = InlineAsm::getFlagWordForMatchingOp(Flag, MatchingIdx); 796 else if (!Regs.empty() && 797 TargetRegisterInfo::isVirtualRegister(Regs.front())) { 798 // Put the register class of the virtual registers in the flag word. That 799 // way, later passes can recompute register class constraints for inline 800 // assembly as well as normal instructions. 801 // Don't do this for tied operands that can use the regclass information 802 // from the def. 803 const MachineRegisterInfo &MRI = DAG.getMachineFunction().getRegInfo(); 804 const TargetRegisterClass *RC = MRI.getRegClass(Regs.front()); 805 Flag = InlineAsm::getFlagWordForRegClass(Flag, RC->getID()); 806 } 807 808 SDValue Res = DAG.getTargetConstant(Flag, MVT::i32); 809 Ops.push_back(Res); 810 811 for (unsigned Value = 0, Reg = 0, e = ValueVTs.size(); Value != e; ++Value) { 812 unsigned NumRegs = TLI.getNumRegisters(*DAG.getContext(), ValueVTs[Value]); 813 EVT RegisterVT = RegVTs[Value]; 814 for (unsigned i = 0; i != NumRegs; ++i) { 815 assert(Reg < Regs.size() && "Mismatch in # registers expected"); 816 Ops.push_back(DAG.getRegister(Regs[Reg++], RegisterVT)); 817 } 818 } 819} 820 821void SelectionDAGBuilder::init(GCFunctionInfo *gfi, AliasAnalysis &aa, 822 const TargetLibraryInfo *li) { 823 AA = &aa; 824 GFI = gfi; 825 LibInfo = li; 826 TD = DAG.getTarget().getTargetData(); 827 LPadToCallSiteMap.clear(); 828} 829 830/// clear - Clear out the current SelectionDAG and the associated 831/// state and prepare this SelectionDAGBuilder object to be used 832/// for a new block. This doesn't clear out information about 833/// additional blocks that are needed to complete switch lowering 834/// or PHI node updating; that information is cleared out as it is 835/// consumed. 836void SelectionDAGBuilder::clear() { 837 NodeMap.clear(); 838 UnusedArgNodeMap.clear(); 839 PendingLoads.clear(); 840 PendingExports.clear(); 841 CurDebugLoc = DebugLoc(); 842 HasTailCall = false; 843} 844 845/// clearDanglingDebugInfo - Clear the dangling debug information 846/// map. This function is seperated from the clear so that debug 847/// information that is dangling in a basic block can be properly 848/// resolved in a different basic block. This allows the 849/// SelectionDAG to resolve dangling debug information attached 850/// to PHI nodes. 851void SelectionDAGBuilder::clearDanglingDebugInfo() { 852 DanglingDebugInfoMap.clear(); 853} 854 855/// getRoot - Return the current virtual root of the Selection DAG, 856/// flushing any PendingLoad items. This must be done before emitting 857/// a store or any other node that may need to be ordered after any 858/// prior load instructions. 859/// 860SDValue SelectionDAGBuilder::getRoot() { 861 if (PendingLoads.empty()) 862 return DAG.getRoot(); 863 864 if (PendingLoads.size() == 1) { 865 SDValue Root = PendingLoads[0]; 866 DAG.setRoot(Root); 867 PendingLoads.clear(); 868 return Root; 869 } 870 871 // Otherwise, we have to make a token factor node. 872 SDValue Root = DAG.getNode(ISD::TokenFactor, getCurDebugLoc(), MVT::Other, 873 &PendingLoads[0], PendingLoads.size()); 874 PendingLoads.clear(); 875 DAG.setRoot(Root); 876 return Root; 877} 878 879/// getControlRoot - Similar to getRoot, but instead of flushing all the 880/// PendingLoad items, flush all the PendingExports items. It is necessary 881/// to do this before emitting a terminator instruction. 882/// 883SDValue SelectionDAGBuilder::getControlRoot() { 884 SDValue Root = DAG.getRoot(); 885 886 if (PendingExports.empty()) 887 return Root; 888 889 // Turn all of the CopyToReg chains into one factored node. 890 if (Root.getOpcode() != ISD::EntryToken) { 891 unsigned i = 0, e = PendingExports.size(); 892 for (; i != e; ++i) { 893 assert(PendingExports[i].getNode()->getNumOperands() > 1); 894 if (PendingExports[i].getNode()->getOperand(0) == Root) 895 break; // Don't add the root if we already indirectly depend on it. 896 } 897 898 if (i == e) 899 PendingExports.push_back(Root); 900 } 901 902 Root = DAG.getNode(ISD::TokenFactor, getCurDebugLoc(), MVT::Other, 903 &PendingExports[0], 904 PendingExports.size()); 905 PendingExports.clear(); 906 DAG.setRoot(Root); 907 return Root; 908} 909 910void SelectionDAGBuilder::AssignOrderingToNode(const SDNode *Node) { 911 if (DAG.GetOrdering(Node) != 0) return; // Already has ordering. 912 DAG.AssignOrdering(Node, SDNodeOrder); 913 914 for (unsigned I = 0, E = Node->getNumOperands(); I != E; ++I) 915 AssignOrderingToNode(Node->getOperand(I).getNode()); 916} 917 918void SelectionDAGBuilder::visit(const Instruction &I) { 919 // Set up outgoing PHI node register values before emitting the terminator. 920 if (isa<TerminatorInst>(&I)) 921 HandlePHINodesInSuccessorBlocks(I.getParent()); 922 923 CurDebugLoc = I.getDebugLoc(); 924 925 visit(I.getOpcode(), I); 926 927 if (!isa<TerminatorInst>(&I) && !HasTailCall) 928 CopyToExportRegsIfNeeded(&I); 929 930 CurDebugLoc = DebugLoc(); 931} 932 933void SelectionDAGBuilder::visitPHI(const PHINode &) { 934 llvm_unreachable("SelectionDAGBuilder shouldn't visit PHI nodes!"); 935} 936 937void SelectionDAGBuilder::visit(unsigned Opcode, const User &I) { 938 // Note: this doesn't use InstVisitor, because it has to work with 939 // ConstantExpr's in addition to instructions. 940 switch (Opcode) { 941 default: llvm_unreachable("Unknown instruction type encountered!"); 942 // Build the switch statement using the Instruction.def file. 943#define HANDLE_INST(NUM, OPCODE, CLASS) \ 944 case Instruction::OPCODE: visit##OPCODE((CLASS&)I); break; 945#include "llvm/Instruction.def" 946 } 947 948 // Assign the ordering to the freshly created DAG nodes. 949 if (NodeMap.count(&I)) { 950 ++SDNodeOrder; 951 AssignOrderingToNode(getValue(&I).getNode()); 952 } 953} 954 955// resolveDanglingDebugInfo - if we saw an earlier dbg_value referring to V, 956// generate the debug data structures now that we've seen its definition. 957void SelectionDAGBuilder::resolveDanglingDebugInfo(const Value *V, 958 SDValue Val) { 959 DanglingDebugInfo &DDI = DanglingDebugInfoMap[V]; 960 if (DDI.getDI()) { 961 const DbgValueInst *DI = DDI.getDI(); 962 DebugLoc dl = DDI.getdl(); 963 unsigned DbgSDNodeOrder = DDI.getSDNodeOrder(); 964 MDNode *Variable = DI->getVariable(); 965 uint64_t Offset = DI->getOffset(); 966 SDDbgValue *SDV; 967 if (Val.getNode()) { 968 if (!EmitFuncArgumentDbgValue(V, Variable, Offset, Val)) { 969 SDV = DAG.getDbgValue(Variable, Val.getNode(), 970 Val.getResNo(), Offset, dl, DbgSDNodeOrder); 971 DAG.AddDbgValue(SDV, Val.getNode(), false); 972 } 973 } else 974 DEBUG(dbgs() << "Dropping debug info for " << DI << "\n"); 975 DanglingDebugInfoMap[V] = DanglingDebugInfo(); 976 } 977} 978 979/// getValue - Return an SDValue for the given Value. 980SDValue SelectionDAGBuilder::getValue(const Value *V) { 981 // If we already have an SDValue for this value, use it. It's important 982 // to do this first, so that we don't create a CopyFromReg if we already 983 // have a regular SDValue. 984 SDValue &N = NodeMap[V]; 985 if (N.getNode()) return N; 986 987 // If there's a virtual register allocated and initialized for this 988 // value, use it. 989 DenseMap<const Value *, unsigned>::iterator It = FuncInfo.ValueMap.find(V); 990 if (It != FuncInfo.ValueMap.end()) { 991 unsigned InReg = It->second; 992 RegsForValue RFV(*DAG.getContext(), TLI, InReg, V->getType()); 993 SDValue Chain = DAG.getEntryNode(); 994 N = RFV.getCopyFromRegs(DAG, FuncInfo, getCurDebugLoc(), Chain, NULL); 995 resolveDanglingDebugInfo(V, N); 996 return N; 997 } 998 999 // Otherwise create a new SDValue and remember it. 1000 SDValue Val = getValueImpl(V); 1001 NodeMap[V] = Val; 1002 resolveDanglingDebugInfo(V, Val); 1003 return Val; 1004} 1005 1006/// getNonRegisterValue - Return an SDValue for the given Value, but 1007/// don't look in FuncInfo.ValueMap for a virtual register. 1008SDValue SelectionDAGBuilder::getNonRegisterValue(const Value *V) { 1009 // If we already have an SDValue for this value, use it. 1010 SDValue &N = NodeMap[V]; 1011 if (N.getNode()) return N; 1012 1013 // Otherwise create a new SDValue and remember it. 1014 SDValue Val = getValueImpl(V); 1015 NodeMap[V] = Val; 1016 resolveDanglingDebugInfo(V, Val); 1017 return Val; 1018} 1019 1020/// getValueImpl - Helper function for getValue and getNonRegisterValue. 1021/// Create an SDValue for the given value. 1022SDValue SelectionDAGBuilder::getValueImpl(const Value *V) { 1023 if (const Constant *C = dyn_cast<Constant>(V)) { 1024 EVT VT = TLI.getValueType(V->getType(), true); 1025 1026 if (const ConstantInt *CI = dyn_cast<ConstantInt>(C)) 1027 return DAG.getConstant(*CI, VT); 1028 1029 if (const GlobalValue *GV = dyn_cast<GlobalValue>(C)) 1030 return DAG.getGlobalAddress(GV, getCurDebugLoc(), VT); 1031 1032 if (isa<ConstantPointerNull>(C)) 1033 return DAG.getConstant(0, TLI.getPointerTy()); 1034 1035 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C)) 1036 return DAG.getConstantFP(*CFP, VT); 1037 1038 if (isa<UndefValue>(C) && !V->getType()->isAggregateType()) 1039 return DAG.getUNDEF(VT); 1040 1041 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) { 1042 visit(CE->getOpcode(), *CE); 1043 SDValue N1 = NodeMap[V]; 1044 assert(N1.getNode() && "visit didn't populate the NodeMap!"); 1045 return N1; 1046 } 1047 1048 if (isa<ConstantStruct>(C) || isa<ConstantArray>(C)) { 1049 SmallVector<SDValue, 4> Constants; 1050 for (User::const_op_iterator OI = C->op_begin(), OE = C->op_end(); 1051 OI != OE; ++OI) { 1052 SDNode *Val = getValue(*OI).getNode(); 1053 // If the operand is an empty aggregate, there are no values. 1054 if (!Val) continue; 1055 // Add each leaf value from the operand to the Constants list 1056 // to form a flattened list of all the values. 1057 for (unsigned i = 0, e = Val->getNumValues(); i != e; ++i) 1058 Constants.push_back(SDValue(Val, i)); 1059 } 1060 1061 return DAG.getMergeValues(&Constants[0], Constants.size(), 1062 getCurDebugLoc()); 1063 } 1064 1065 if (const ConstantDataSequential *CDS = 1066 dyn_cast<ConstantDataSequential>(C)) { 1067 SmallVector<SDValue, 4> Ops; 1068 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) { 1069 SDNode *Val = getValue(CDS->getElementAsConstant(i)).getNode(); 1070 // Add each leaf value from the operand to the Constants list 1071 // to form a flattened list of all the values. 1072 for (unsigned i = 0, e = Val->getNumValues(); i != e; ++i) 1073 Ops.push_back(SDValue(Val, i)); 1074 } 1075 1076 if (isa<ArrayType>(CDS->getType())) 1077 return DAG.getMergeValues(&Ops[0], Ops.size(), getCurDebugLoc()); 1078 return NodeMap[V] = DAG.getNode(ISD::BUILD_VECTOR, getCurDebugLoc(), 1079 VT, &Ops[0], Ops.size()); 1080 } 1081 1082 if (C->getType()->isStructTy() || C->getType()->isArrayTy()) { 1083 assert((isa<ConstantAggregateZero>(C) || isa<UndefValue>(C)) && 1084 "Unknown struct or array constant!"); 1085 1086 SmallVector<EVT, 4> ValueVTs; 1087 ComputeValueVTs(TLI, C->getType(), ValueVTs); 1088 unsigned NumElts = ValueVTs.size(); 1089 if (NumElts == 0) 1090 return SDValue(); // empty struct 1091 SmallVector<SDValue, 4> Constants(NumElts); 1092 for (unsigned i = 0; i != NumElts; ++i) { 1093 EVT EltVT = ValueVTs[i]; 1094 if (isa<UndefValue>(C)) 1095 Constants[i] = DAG.getUNDEF(EltVT); 1096 else if (EltVT.isFloatingPoint()) 1097 Constants[i] = DAG.getConstantFP(0, EltVT); 1098 else 1099 Constants[i] = DAG.getConstant(0, EltVT); 1100 } 1101 1102 return DAG.getMergeValues(&Constants[0], NumElts, 1103 getCurDebugLoc()); 1104 } 1105 1106 if (const BlockAddress *BA = dyn_cast<BlockAddress>(C)) 1107 return DAG.getBlockAddress(BA, VT); 1108 1109 VectorType *VecTy = cast<VectorType>(V->getType()); 1110 unsigned NumElements = VecTy->getNumElements(); 1111 1112 // Now that we know the number and type of the elements, get that number of 1113 // elements into the Ops array based on what kind of constant it is. 1114 SmallVector<SDValue, 16> Ops; 1115 if (const ConstantVector *CV = dyn_cast<ConstantVector>(C)) { 1116 for (unsigned i = 0; i != NumElements; ++i) 1117 Ops.push_back(getValue(CV->getOperand(i))); 1118 } else { 1119 assert(isa<ConstantAggregateZero>(C) && "Unknown vector constant!"); 1120 EVT EltVT = TLI.getValueType(VecTy->getElementType()); 1121 1122 SDValue Op; 1123 if (EltVT.isFloatingPoint()) 1124 Op = DAG.getConstantFP(0, EltVT); 1125 else 1126 Op = DAG.getConstant(0, EltVT); 1127 Ops.assign(NumElements, Op); 1128 } 1129 1130 // Create a BUILD_VECTOR node. 1131 return NodeMap[V] = DAG.getNode(ISD::BUILD_VECTOR, getCurDebugLoc(), 1132 VT, &Ops[0], Ops.size()); 1133 } 1134 1135 // If this is a static alloca, generate it as the frameindex instead of 1136 // computation. 1137 if (const AllocaInst *AI = dyn_cast<AllocaInst>(V)) { 1138 DenseMap<const AllocaInst*, int>::iterator SI = 1139 FuncInfo.StaticAllocaMap.find(AI); 1140 if (SI != FuncInfo.StaticAllocaMap.end()) 1141 return DAG.getFrameIndex(SI->second, TLI.getPointerTy()); 1142 } 1143 1144 // If this is an instruction which fast-isel has deferred, select it now. 1145 if (const Instruction *Inst = dyn_cast<Instruction>(V)) { 1146 unsigned InReg = FuncInfo.InitializeRegForValue(Inst); 1147 RegsForValue RFV(*DAG.getContext(), TLI, InReg, Inst->getType()); 1148 SDValue Chain = DAG.getEntryNode(); 1149 return RFV.getCopyFromRegs(DAG, FuncInfo, getCurDebugLoc(), Chain, NULL); 1150 } 1151 1152 llvm_unreachable("Can't get register for value!"); 1153} 1154 1155void SelectionDAGBuilder::visitRet(const ReturnInst &I) { 1156 SDValue Chain = getControlRoot(); 1157 SmallVector<ISD::OutputArg, 8> Outs; 1158 SmallVector<SDValue, 8> OutVals; 1159 1160 if (!FuncInfo.CanLowerReturn) { 1161 unsigned DemoteReg = FuncInfo.DemoteRegister; 1162 const Function *F = I.getParent()->getParent(); 1163 1164 // Emit a store of the return value through the virtual register. 1165 // Leave Outs empty so that LowerReturn won't try to load return 1166 // registers the usual way. 1167 SmallVector<EVT, 1> PtrValueVTs; 1168 ComputeValueVTs(TLI, PointerType::getUnqual(F->getReturnType()), 1169 PtrValueVTs); 1170 1171 SDValue RetPtr = DAG.getRegister(DemoteReg, PtrValueVTs[0]); 1172 SDValue RetOp = getValue(I.getOperand(0)); 1173 1174 SmallVector<EVT, 4> ValueVTs; 1175 SmallVector<uint64_t, 4> Offsets; 1176 ComputeValueVTs(TLI, I.getOperand(0)->getType(), ValueVTs, &Offsets); 1177 unsigned NumValues = ValueVTs.size(); 1178 1179 SmallVector<SDValue, 4> Chains(NumValues); 1180 for (unsigned i = 0; i != NumValues; ++i) { 1181 SDValue Add = DAG.getNode(ISD::ADD, getCurDebugLoc(), 1182 RetPtr.getValueType(), RetPtr, 1183 DAG.getIntPtrConstant(Offsets[i])); 1184 Chains[i] = 1185 DAG.getStore(Chain, getCurDebugLoc(), 1186 SDValue(RetOp.getNode(), RetOp.getResNo() + i), 1187 // FIXME: better loc info would be nice. 1188 Add, MachinePointerInfo(), false, false, 0); 1189 } 1190 1191 Chain = DAG.getNode(ISD::TokenFactor, getCurDebugLoc(), 1192 MVT::Other, &Chains[0], NumValues); 1193 } else if (I.getNumOperands() != 0) { 1194 SmallVector<EVT, 4> ValueVTs; 1195 ComputeValueVTs(TLI, I.getOperand(0)->getType(), ValueVTs); 1196 unsigned NumValues = ValueVTs.size(); 1197 if (NumValues) { 1198 SDValue RetOp = getValue(I.getOperand(0)); 1199 for (unsigned j = 0, f = NumValues; j != f; ++j) { 1200 EVT VT = ValueVTs[j]; 1201 1202 ISD::NodeType ExtendKind = ISD::ANY_EXTEND; 1203 1204 const Function *F = I.getParent()->getParent(); 1205 if (F->paramHasAttr(0, Attribute::SExt)) 1206 ExtendKind = ISD::SIGN_EXTEND; 1207 else if (F->paramHasAttr(0, Attribute::ZExt)) 1208 ExtendKind = ISD::ZERO_EXTEND; 1209 1210 if (ExtendKind != ISD::ANY_EXTEND && VT.isInteger()) 1211 VT = TLI.getTypeForExtArgOrReturn(*DAG.getContext(), VT, ExtendKind); 1212 1213 unsigned NumParts = TLI.getNumRegisters(*DAG.getContext(), VT); 1214 EVT PartVT = TLI.getRegisterType(*DAG.getContext(), VT); 1215 SmallVector<SDValue, 4> Parts(NumParts); 1216 getCopyToParts(DAG, getCurDebugLoc(), 1217 SDValue(RetOp.getNode(), RetOp.getResNo() + j), 1218 &Parts[0], NumParts, PartVT, ExtendKind); 1219 1220 // 'inreg' on function refers to return value 1221 ISD::ArgFlagsTy Flags = ISD::ArgFlagsTy(); 1222 if (F->paramHasAttr(0, Attribute::InReg)) 1223 Flags.setInReg(); 1224 1225 // Propagate extension type if any 1226 if (ExtendKind == ISD::SIGN_EXTEND) 1227 Flags.setSExt(); 1228 else if (ExtendKind == ISD::ZERO_EXTEND) 1229 Flags.setZExt(); 1230 1231 for (unsigned i = 0; i < NumParts; ++i) { 1232 Outs.push_back(ISD::OutputArg(Flags, Parts[i].getValueType(), 1233 /*isfixed=*/true)); 1234 OutVals.push_back(Parts[i]); 1235 } 1236 } 1237 } 1238 } 1239 1240 bool isVarArg = DAG.getMachineFunction().getFunction()->isVarArg(); 1241 CallingConv::ID CallConv = 1242 DAG.getMachineFunction().getFunction()->getCallingConv(); 1243 Chain = TLI.LowerReturn(Chain, CallConv, isVarArg, 1244 Outs, OutVals, getCurDebugLoc(), DAG); 1245 1246 // Verify that the target's LowerReturn behaved as expected. 1247 assert(Chain.getNode() && Chain.getValueType() == MVT::Other && 1248 "LowerReturn didn't return a valid chain!"); 1249 1250 // Update the DAG with the new chain value resulting from return lowering. 1251 DAG.setRoot(Chain); 1252} 1253 1254/// CopyToExportRegsIfNeeded - If the given value has virtual registers 1255/// created for it, emit nodes to copy the value into the virtual 1256/// registers. 1257void SelectionDAGBuilder::CopyToExportRegsIfNeeded(const Value *V) { 1258 // Skip empty types 1259 if (V->getType()->isEmptyTy()) 1260 return; 1261 1262 DenseMap<const Value *, unsigned>::iterator VMI = FuncInfo.ValueMap.find(V); 1263 if (VMI != FuncInfo.ValueMap.end()) { 1264 assert(!V->use_empty() && "Unused value assigned virtual registers!"); 1265 CopyValueToVirtualRegister(V, VMI->second); 1266 } 1267} 1268 1269/// ExportFromCurrentBlock - If this condition isn't known to be exported from 1270/// the current basic block, add it to ValueMap now so that we'll get a 1271/// CopyTo/FromReg. 1272void SelectionDAGBuilder::ExportFromCurrentBlock(const Value *V) { 1273 // No need to export constants. 1274 if (!isa<Instruction>(V) && !isa<Argument>(V)) return; 1275 1276 // Already exported? 1277 if (FuncInfo.isExportedInst(V)) return; 1278 1279 unsigned Reg = FuncInfo.InitializeRegForValue(V); 1280 CopyValueToVirtualRegister(V, Reg); 1281} 1282 1283bool SelectionDAGBuilder::isExportableFromCurrentBlock(const Value *V, 1284 const BasicBlock *FromBB) { 1285 // The operands of the setcc have to be in this block. We don't know 1286 // how to export them from some other block. 1287 if (const Instruction *VI = dyn_cast<Instruction>(V)) { 1288 // Can export from current BB. 1289 if (VI->getParent() == FromBB) 1290 return true; 1291 1292 // Is already exported, noop. 1293 return FuncInfo.isExportedInst(V); 1294 } 1295 1296 // If this is an argument, we can export it if the BB is the entry block or 1297 // if it is already exported. 1298 if (isa<Argument>(V)) { 1299 if (FromBB == &FromBB->getParent()->getEntryBlock()) 1300 return true; 1301 1302 // Otherwise, can only export this if it is already exported. 1303 return FuncInfo.isExportedInst(V); 1304 } 1305 1306 // Otherwise, constants can always be exported. 1307 return true; 1308} 1309 1310/// Return branch probability calculated by BranchProbabilityInfo for IR blocks. 1311uint32_t SelectionDAGBuilder::getEdgeWeight(const MachineBasicBlock *Src, 1312 const MachineBasicBlock *Dst) const { 1313 BranchProbabilityInfo *BPI = FuncInfo.BPI; 1314 if (!BPI) 1315 return 0; 1316 const BasicBlock *SrcBB = Src->getBasicBlock(); 1317 const BasicBlock *DstBB = Dst->getBasicBlock(); 1318 return BPI->getEdgeWeight(SrcBB, DstBB); 1319} 1320 1321void SelectionDAGBuilder:: 1322addSuccessorWithWeight(MachineBasicBlock *Src, MachineBasicBlock *Dst, 1323 uint32_t Weight /* = 0 */) { 1324 if (!Weight) 1325 Weight = getEdgeWeight(Src, Dst); 1326 Src->addSuccessor(Dst, Weight); 1327} 1328 1329 1330static bool InBlock(const Value *V, const BasicBlock *BB) { 1331 if (const Instruction *I = dyn_cast<Instruction>(V)) 1332 return I->getParent() == BB; 1333 return true; 1334} 1335 1336/// EmitBranchForMergedCondition - Helper method for FindMergedConditions. 1337/// This function emits a branch and is used at the leaves of an OR or an 1338/// AND operator tree. 1339/// 1340void 1341SelectionDAGBuilder::EmitBranchForMergedCondition(const Value *Cond, 1342 MachineBasicBlock *TBB, 1343 MachineBasicBlock *FBB, 1344 MachineBasicBlock *CurBB, 1345 MachineBasicBlock *SwitchBB) { 1346 const BasicBlock *BB = CurBB->getBasicBlock(); 1347 1348 // If the leaf of the tree is a comparison, merge the condition into 1349 // the caseblock. 1350 if (const CmpInst *BOp = dyn_cast<CmpInst>(Cond)) { 1351 // The operands of the cmp have to be in this block. We don't know 1352 // how to export them from some other block. If this is the first block 1353 // of the sequence, no exporting is needed. 1354 if (CurBB == SwitchBB || 1355 (isExportableFromCurrentBlock(BOp->getOperand(0), BB) && 1356 isExportableFromCurrentBlock(BOp->getOperand(1), BB))) { 1357 ISD::CondCode Condition; 1358 if (const ICmpInst *IC = dyn_cast<ICmpInst>(Cond)) { 1359 Condition = getICmpCondCode(IC->getPredicate()); 1360 } else if (const FCmpInst *FC = dyn_cast<FCmpInst>(Cond)) { 1361 Condition = getFCmpCondCode(FC->getPredicate()); 1362 if (TM.Options.NoNaNsFPMath) 1363 Condition = getFCmpCodeWithoutNaN(Condition); 1364 } else { 1365 Condition = ISD::SETEQ; // silence warning. 1366 llvm_unreachable("Unknown compare instruction"); 1367 } 1368 1369 CaseBlock CB(Condition, BOp->getOperand(0), 1370 BOp->getOperand(1), NULL, TBB, FBB, CurBB); 1371 SwitchCases.push_back(CB); 1372 return; 1373 } 1374 } 1375 1376 // Create a CaseBlock record representing this branch. 1377 CaseBlock CB(ISD::SETEQ, Cond, ConstantInt::getTrue(*DAG.getContext()), 1378 NULL, TBB, FBB, CurBB); 1379 SwitchCases.push_back(CB); 1380} 1381 1382/// FindMergedConditions - If Cond is an expression like 1383void SelectionDAGBuilder::FindMergedConditions(const Value *Cond, 1384 MachineBasicBlock *TBB, 1385 MachineBasicBlock *FBB, 1386 MachineBasicBlock *CurBB, 1387 MachineBasicBlock *SwitchBB, 1388 unsigned Opc) { 1389 // If this node is not part of the or/and tree, emit it as a branch. 1390 const Instruction *BOp = dyn_cast<Instruction>(Cond); 1391 if (!BOp || !(isa<BinaryOperator>(BOp) || isa<CmpInst>(BOp)) || 1392 (unsigned)BOp->getOpcode() != Opc || !BOp->hasOneUse() || 1393 BOp->getParent() != CurBB->getBasicBlock() || 1394 !InBlock(BOp->getOperand(0), CurBB->getBasicBlock()) || 1395 !InBlock(BOp->getOperand(1), CurBB->getBasicBlock())) { 1396 EmitBranchForMergedCondition(Cond, TBB, FBB, CurBB, SwitchBB); 1397 return; 1398 } 1399 1400 // Create TmpBB after CurBB. 1401 MachineFunction::iterator BBI = CurBB; 1402 MachineFunction &MF = DAG.getMachineFunction(); 1403 MachineBasicBlock *TmpBB = MF.CreateMachineBasicBlock(CurBB->getBasicBlock()); 1404 CurBB->getParent()->insert(++BBI, TmpBB); 1405 1406 if (Opc == Instruction::Or) { 1407 // Codegen X | Y as: 1408 // jmp_if_X TBB 1409 // jmp TmpBB 1410 // TmpBB: 1411 // jmp_if_Y TBB 1412 // jmp FBB 1413 // 1414 1415 // Emit the LHS condition. 1416 FindMergedConditions(BOp->getOperand(0), TBB, TmpBB, CurBB, SwitchBB, Opc); 1417 1418 // Emit the RHS condition into TmpBB. 1419 FindMergedConditions(BOp->getOperand(1), TBB, FBB, TmpBB, SwitchBB, Opc); 1420 } else { 1421 assert(Opc == Instruction::And && "Unknown merge op!"); 1422 // Codegen X & Y as: 1423 // jmp_if_X TmpBB 1424 // jmp FBB 1425 // TmpBB: 1426 // jmp_if_Y TBB 1427 // jmp FBB 1428 // 1429 // This requires creation of TmpBB after CurBB. 1430 1431 // Emit the LHS condition. 1432 FindMergedConditions(BOp->getOperand(0), TmpBB, FBB, CurBB, SwitchBB, Opc); 1433 1434 // Emit the RHS condition into TmpBB. 1435 FindMergedConditions(BOp->getOperand(1), TBB, FBB, TmpBB, SwitchBB, Opc); 1436 } 1437} 1438 1439/// If the set of cases should be emitted as a series of branches, return true. 1440/// If we should emit this as a bunch of and/or'd together conditions, return 1441/// false. 1442bool 1443SelectionDAGBuilder::ShouldEmitAsBranches(const std::vector<CaseBlock> &Cases){ 1444 if (Cases.size() != 2) return true; 1445 1446 // If this is two comparisons of the same values or'd or and'd together, they 1447 // will get folded into a single comparison, so don't emit two blocks. 1448 if ((Cases[0].CmpLHS == Cases[1].CmpLHS && 1449 Cases[0].CmpRHS == Cases[1].CmpRHS) || 1450 (Cases[0].CmpRHS == Cases[1].CmpLHS && 1451 Cases[0].CmpLHS == Cases[1].CmpRHS)) { 1452 return false; 1453 } 1454 1455 // Handle: (X != null) | (Y != null) --> (X|Y) != 0 1456 // Handle: (X == null) & (Y == null) --> (X|Y) == 0 1457 if (Cases[0].CmpRHS == Cases[1].CmpRHS && 1458 Cases[0].CC == Cases[1].CC && 1459 isa<Constant>(Cases[0].CmpRHS) && 1460 cast<Constant>(Cases[0].CmpRHS)->isNullValue()) { 1461 if (Cases[0].CC == ISD::SETEQ && Cases[0].TrueBB == Cases[1].ThisBB) 1462 return false; 1463 if (Cases[0].CC == ISD::SETNE && Cases[0].FalseBB == Cases[1].ThisBB) 1464 return false; 1465 } 1466 1467 return true; 1468} 1469 1470void SelectionDAGBuilder::visitBr(const BranchInst &I) { 1471 MachineBasicBlock *BrMBB = FuncInfo.MBB; 1472 1473 // Update machine-CFG edges. 1474 MachineBasicBlock *Succ0MBB = FuncInfo.MBBMap[I.getSuccessor(0)]; 1475 1476 // Figure out which block is immediately after the current one. 1477 MachineBasicBlock *NextBlock = 0; 1478 MachineFunction::iterator BBI = BrMBB; 1479 if (++BBI != FuncInfo.MF->end()) 1480 NextBlock = BBI; 1481 1482 if (I.isUnconditional()) { 1483 // Update machine-CFG edges. 1484 BrMBB->addSuccessor(Succ0MBB); 1485 1486 // If this is not a fall-through branch, emit the branch. 1487 if (Succ0MBB != NextBlock) 1488 DAG.setRoot(DAG.getNode(ISD::BR, getCurDebugLoc(), 1489 MVT::Other, getControlRoot(), 1490 DAG.getBasicBlock(Succ0MBB))); 1491 1492 return; 1493 } 1494 1495 // If this condition is one of the special cases we handle, do special stuff 1496 // now. 1497 const Value *CondVal = I.getCondition(); 1498 MachineBasicBlock *Succ1MBB = FuncInfo.MBBMap[I.getSuccessor(1)]; 1499 1500 // If this is a series of conditions that are or'd or and'd together, emit 1501 // this as a sequence of branches instead of setcc's with and/or operations. 1502 // As long as jumps are not expensive, this should improve performance. 1503 // For example, instead of something like: 1504 // cmp A, B 1505 // C = seteq 1506 // cmp D, E 1507 // F = setle 1508 // or C, F 1509 // jnz foo 1510 // Emit: 1511 // cmp A, B 1512 // je foo 1513 // cmp D, E 1514 // jle foo 1515 // 1516 if (const BinaryOperator *BOp = dyn_cast<BinaryOperator>(CondVal)) { 1517 if (!TLI.isJumpExpensive() && 1518 BOp->hasOneUse() && 1519 (BOp->getOpcode() == Instruction::And || 1520 BOp->getOpcode() == Instruction::Or)) { 1521 FindMergedConditions(BOp, Succ0MBB, Succ1MBB, BrMBB, BrMBB, 1522 BOp->getOpcode()); 1523 // If the compares in later blocks need to use values not currently 1524 // exported from this block, export them now. This block should always 1525 // be the first entry. 1526 assert(SwitchCases[0].ThisBB == BrMBB && "Unexpected lowering!"); 1527 1528 // Allow some cases to be rejected. 1529 if (ShouldEmitAsBranches(SwitchCases)) { 1530 for (unsigned i = 1, e = SwitchCases.size(); i != e; ++i) { 1531 ExportFromCurrentBlock(SwitchCases[i].CmpLHS); 1532 ExportFromCurrentBlock(SwitchCases[i].CmpRHS); 1533 } 1534 1535 // Emit the branch for this block. 1536 visitSwitchCase(SwitchCases[0], BrMBB); 1537 SwitchCases.erase(SwitchCases.begin()); 1538 return; 1539 } 1540 1541 // Okay, we decided not to do this, remove any inserted MBB's and clear 1542 // SwitchCases. 1543 for (unsigned i = 1, e = SwitchCases.size(); i != e; ++i) 1544 FuncInfo.MF->erase(SwitchCases[i].ThisBB); 1545 1546 SwitchCases.clear(); 1547 } 1548 } 1549 1550 // Create a CaseBlock record representing this branch. 1551 CaseBlock CB(ISD::SETEQ, CondVal, ConstantInt::getTrue(*DAG.getContext()), 1552 NULL, Succ0MBB, Succ1MBB, BrMBB); 1553 1554 // Use visitSwitchCase to actually insert the fast branch sequence for this 1555 // cond branch. 1556 visitSwitchCase(CB, BrMBB); 1557} 1558 1559/// visitSwitchCase - Emits the necessary code to represent a single node in 1560/// the binary search tree resulting from lowering a switch instruction. 1561void SelectionDAGBuilder::visitSwitchCase(CaseBlock &CB, 1562 MachineBasicBlock *SwitchBB) { 1563 SDValue Cond; 1564 SDValue CondLHS = getValue(CB.CmpLHS); 1565 DebugLoc dl = getCurDebugLoc(); 1566 1567 // Build the setcc now. 1568 if (CB.CmpMHS == NULL) { 1569 // Fold "(X == true)" to X and "(X == false)" to !X to 1570 // handle common cases produced by branch lowering. 1571 if (CB.CmpRHS == ConstantInt::getTrue(*DAG.getContext()) && 1572 CB.CC == ISD::SETEQ) 1573 Cond = CondLHS; 1574 else if (CB.CmpRHS == ConstantInt::getFalse(*DAG.getContext()) && 1575 CB.CC == ISD::SETEQ) { 1576 SDValue True = DAG.getConstant(1, CondLHS.getValueType()); 1577 Cond = DAG.getNode(ISD::XOR, dl, CondLHS.getValueType(), CondLHS, True); 1578 } else 1579 Cond = DAG.getSetCC(dl, MVT::i1, CondLHS, getValue(CB.CmpRHS), CB.CC); 1580 } else { 1581 assert(CB.CC == ISD::SETLE && "Can handle only LE ranges now"); 1582 1583 const APInt& Low = cast<ConstantInt>(CB.CmpLHS)->getValue(); 1584 const APInt& High = cast<ConstantInt>(CB.CmpRHS)->getValue(); 1585 1586 SDValue CmpOp = getValue(CB.CmpMHS); 1587 EVT VT = CmpOp.getValueType(); 1588 1589 if (cast<ConstantInt>(CB.CmpLHS)->isMinValue(true)) { 1590 Cond = DAG.getSetCC(dl, MVT::i1, CmpOp, DAG.getConstant(High, VT), 1591 ISD::SETLE); 1592 } else { 1593 SDValue SUB = DAG.getNode(ISD::SUB, dl, 1594 VT, CmpOp, DAG.getConstant(Low, VT)); 1595 Cond = DAG.getSetCC(dl, MVT::i1, SUB, 1596 DAG.getConstant(High-Low, VT), ISD::SETULE); 1597 } 1598 } 1599 1600 // Update successor info 1601 addSuccessorWithWeight(SwitchBB, CB.TrueBB, CB.TrueWeight); 1602 addSuccessorWithWeight(SwitchBB, CB.FalseBB, CB.FalseWeight); 1603 1604 // Set NextBlock to be the MBB immediately after the current one, if any. 1605 // This is used to avoid emitting unnecessary branches to the next block. 1606 MachineBasicBlock *NextBlock = 0; 1607 MachineFunction::iterator BBI = SwitchBB; 1608 if (++BBI != FuncInfo.MF->end()) 1609 NextBlock = BBI; 1610 1611 // If the lhs block is the next block, invert the condition so that we can 1612 // fall through to the lhs instead of the rhs block. 1613 if (CB.TrueBB == NextBlock) { 1614 std::swap(CB.TrueBB, CB.FalseBB); 1615 SDValue True = DAG.getConstant(1, Cond.getValueType()); 1616 Cond = DAG.getNode(ISD::XOR, dl, Cond.getValueType(), Cond, True); 1617 } 1618 1619 SDValue BrCond = DAG.getNode(ISD::BRCOND, dl, 1620 MVT::Other, getControlRoot(), Cond, 1621 DAG.getBasicBlock(CB.TrueBB)); 1622 1623 // Insert the false branch. Do this even if it's a fall through branch, 1624 // this makes it easier to do DAG optimizations which require inverting 1625 // the branch condition. 1626 BrCond = DAG.getNode(ISD::BR, dl, MVT::Other, BrCond, 1627 DAG.getBasicBlock(CB.FalseBB)); 1628 1629 DAG.setRoot(BrCond); 1630} 1631 1632/// visitJumpTable - Emit JumpTable node in the current MBB 1633void SelectionDAGBuilder::visitJumpTable(JumpTable &JT) { 1634 // Emit the code for the jump table 1635 assert(JT.Reg != -1U && "Should lower JT Header first!"); 1636 EVT PTy = TLI.getPointerTy(); 1637 SDValue Index = DAG.getCopyFromReg(getControlRoot(), getCurDebugLoc(), 1638 JT.Reg, PTy); 1639 SDValue Table = DAG.getJumpTable(JT.JTI, PTy); 1640 SDValue BrJumpTable = DAG.getNode(ISD::BR_JT, getCurDebugLoc(), 1641 MVT::Other, Index.getValue(1), 1642 Table, Index); 1643 DAG.setRoot(BrJumpTable); 1644} 1645 1646/// visitJumpTableHeader - This function emits necessary code to produce index 1647/// in the JumpTable from switch case. 1648void SelectionDAGBuilder::visitJumpTableHeader(JumpTable &JT, 1649 JumpTableHeader &JTH, 1650 MachineBasicBlock *SwitchBB) { 1651 // Subtract the lowest switch case value from the value being switched on and 1652 // conditional branch to default mbb if the result is greater than the 1653 // difference between smallest and largest cases. 1654 SDValue SwitchOp = getValue(JTH.SValue); 1655 EVT VT = SwitchOp.getValueType(); 1656 SDValue Sub = DAG.getNode(ISD::SUB, getCurDebugLoc(), VT, SwitchOp, 1657 DAG.getConstant(JTH.First, VT)); 1658 1659 // The SDNode we just created, which holds the value being switched on minus 1660 // the smallest case value, needs to be copied to a virtual register so it 1661 // can be used as an index into the jump table in a subsequent basic block. 1662 // This value may be smaller or larger than the target's pointer type, and 1663 // therefore require extension or truncating. 1664 SwitchOp = DAG.getZExtOrTrunc(Sub, getCurDebugLoc(), TLI.getPointerTy()); 1665 1666 unsigned JumpTableReg = FuncInfo.CreateReg(TLI.getPointerTy()); 1667 SDValue CopyTo = DAG.getCopyToReg(getControlRoot(), getCurDebugLoc(), 1668 JumpTableReg, SwitchOp); 1669 JT.Reg = JumpTableReg; 1670 1671 // Emit the range check for the jump table, and branch to the default block 1672 // for the switch statement if the value being switched on exceeds the largest 1673 // case in the switch. 1674 SDValue CMP = DAG.getSetCC(getCurDebugLoc(), 1675 TLI.getSetCCResultType(Sub.getValueType()), Sub, 1676 DAG.getConstant(JTH.Last-JTH.First,VT), 1677 ISD::SETUGT); 1678 1679 // Set NextBlock to be the MBB immediately after the current one, if any. 1680 // This is used to avoid emitting unnecessary branches to the next block. 1681 MachineBasicBlock *NextBlock = 0; 1682 MachineFunction::iterator BBI = SwitchBB; 1683 1684 if (++BBI != FuncInfo.MF->end()) 1685 NextBlock = BBI; 1686 1687 SDValue BrCond = DAG.getNode(ISD::BRCOND, getCurDebugLoc(), 1688 MVT::Other, CopyTo, CMP, 1689 DAG.getBasicBlock(JT.Default)); 1690 1691 if (JT.MBB != NextBlock) 1692 BrCond = DAG.getNode(ISD::BR, getCurDebugLoc(), MVT::Other, BrCond, 1693 DAG.getBasicBlock(JT.MBB)); 1694 1695 DAG.setRoot(BrCond); 1696} 1697 1698/// visitBitTestHeader - This function emits necessary code to produce value 1699/// suitable for "bit tests" 1700void SelectionDAGBuilder::visitBitTestHeader(BitTestBlock &B, 1701 MachineBasicBlock *SwitchBB) { 1702 // Subtract the minimum value 1703 SDValue SwitchOp = getValue(B.SValue); 1704 EVT VT = SwitchOp.getValueType(); 1705 SDValue Sub = DAG.getNode(ISD::SUB, getCurDebugLoc(), VT, SwitchOp, 1706 DAG.getConstant(B.First, VT)); 1707 1708 // Check range 1709 SDValue RangeCmp = DAG.getSetCC(getCurDebugLoc(), 1710 TLI.getSetCCResultType(Sub.getValueType()), 1711 Sub, DAG.getConstant(B.Range, VT), 1712 ISD::SETUGT); 1713 1714 // Determine the type of the test operands. 1715 bool UsePtrType = false; 1716 if (!TLI.isTypeLegal(VT)) 1717 UsePtrType = true; 1718 else { 1719 for (unsigned i = 0, e = B.Cases.size(); i != e; ++i) 1720 if (!isUIntN(VT.getSizeInBits(), B.Cases[i].Mask)) { 1721 // Switch table case range are encoded into series of masks. 1722 // Just use pointer type, it's guaranteed to fit. 1723 UsePtrType = true; 1724 break; 1725 } 1726 } 1727 if (UsePtrType) { 1728 VT = TLI.getPointerTy(); 1729 Sub = DAG.getZExtOrTrunc(Sub, getCurDebugLoc(), VT); 1730 } 1731 1732 B.RegVT = VT; 1733 B.Reg = FuncInfo.CreateReg(VT); 1734 SDValue CopyTo = DAG.getCopyToReg(getControlRoot(), getCurDebugLoc(), 1735 B.Reg, Sub); 1736 1737 // Set NextBlock to be the MBB immediately after the current one, if any. 1738 // This is used to avoid emitting unnecessary branches to the next block. 1739 MachineBasicBlock *NextBlock = 0; 1740 MachineFunction::iterator BBI = SwitchBB; 1741 if (++BBI != FuncInfo.MF->end()) 1742 NextBlock = BBI; 1743 1744 MachineBasicBlock* MBB = B.Cases[0].ThisBB; 1745 1746 addSuccessorWithWeight(SwitchBB, B.Default); 1747 addSuccessorWithWeight(SwitchBB, MBB); 1748 1749 SDValue BrRange = DAG.getNode(ISD::BRCOND, getCurDebugLoc(), 1750 MVT::Other, CopyTo, RangeCmp, 1751 DAG.getBasicBlock(B.Default)); 1752 1753 if (MBB != NextBlock) 1754 BrRange = DAG.getNode(ISD::BR, getCurDebugLoc(), MVT::Other, CopyTo, 1755 DAG.getBasicBlock(MBB)); 1756 1757 DAG.setRoot(BrRange); 1758} 1759 1760/// visitBitTestCase - this function produces one "bit test" 1761void SelectionDAGBuilder::visitBitTestCase(BitTestBlock &BB, 1762 MachineBasicBlock* NextMBB, 1763 unsigned Reg, 1764 BitTestCase &B, 1765 MachineBasicBlock *SwitchBB) { 1766 EVT VT = BB.RegVT; 1767 SDValue ShiftOp = DAG.getCopyFromReg(getControlRoot(), getCurDebugLoc(), 1768 Reg, VT); 1769 SDValue Cmp; 1770 unsigned PopCount = CountPopulation_64(B.Mask); 1771 if (PopCount == 1) { 1772 // Testing for a single bit; just compare the shift count with what it 1773 // would need to be to shift a 1 bit in that position. 1774 Cmp = DAG.getSetCC(getCurDebugLoc(), 1775 TLI.getSetCCResultType(VT), 1776 ShiftOp, 1777 DAG.getConstant(CountTrailingZeros_64(B.Mask), VT), 1778 ISD::SETEQ); 1779 } else if (PopCount == BB.Range) { 1780 // There is only one zero bit in the range, test for it directly. 1781 Cmp = DAG.getSetCC(getCurDebugLoc(), 1782 TLI.getSetCCResultType(VT), 1783 ShiftOp, 1784 DAG.getConstant(CountTrailingOnes_64(B.Mask), VT), 1785 ISD::SETNE); 1786 } else { 1787 // Make desired shift 1788 SDValue SwitchVal = DAG.getNode(ISD::SHL, getCurDebugLoc(), VT, 1789 DAG.getConstant(1, VT), ShiftOp); 1790 1791 // Emit bit tests and jumps 1792 SDValue AndOp = DAG.getNode(ISD::AND, getCurDebugLoc(), 1793 VT, SwitchVal, DAG.getConstant(B.Mask, VT)); 1794 Cmp = DAG.getSetCC(getCurDebugLoc(), 1795 TLI.getSetCCResultType(VT), 1796 AndOp, DAG.getConstant(0, VT), 1797 ISD::SETNE); 1798 } 1799 1800 addSuccessorWithWeight(SwitchBB, B.TargetBB); 1801 addSuccessorWithWeight(SwitchBB, NextMBB); 1802 1803 SDValue BrAnd = DAG.getNode(ISD::BRCOND, getCurDebugLoc(), 1804 MVT::Other, getControlRoot(), 1805 Cmp, DAG.getBasicBlock(B.TargetBB)); 1806 1807 // Set NextBlock to be the MBB immediately after the current one, if any. 1808 // This is used to avoid emitting unnecessary branches to the next block. 1809 MachineBasicBlock *NextBlock = 0; 1810 MachineFunction::iterator BBI = SwitchBB; 1811 if (++BBI != FuncInfo.MF->end()) 1812 NextBlock = BBI; 1813 1814 if (NextMBB != NextBlock) 1815 BrAnd = DAG.getNode(ISD::BR, getCurDebugLoc(), MVT::Other, BrAnd, 1816 DAG.getBasicBlock(NextMBB)); 1817 1818 DAG.setRoot(BrAnd); 1819} 1820 1821void SelectionDAGBuilder::visitInvoke(const InvokeInst &I) { 1822 MachineBasicBlock *InvokeMBB = FuncInfo.MBB; 1823 1824 // Retrieve successors. 1825 MachineBasicBlock *Return = FuncInfo.MBBMap[I.getSuccessor(0)]; 1826 MachineBasicBlock *LandingPad = FuncInfo.MBBMap[I.getSuccessor(1)]; 1827 1828 const Value *Callee(I.getCalledValue()); 1829 if (isa<InlineAsm>(Callee)) 1830 visitInlineAsm(&I); 1831 else 1832 LowerCallTo(&I, getValue(Callee), false, LandingPad); 1833 1834 // If the value of the invoke is used outside of its defining block, make it 1835 // available as a virtual register. 1836 CopyToExportRegsIfNeeded(&I); 1837 1838 // Update successor info 1839 addSuccessorWithWeight(InvokeMBB, Return); 1840 addSuccessorWithWeight(InvokeMBB, LandingPad); 1841 1842 // Drop into normal successor. 1843 DAG.setRoot(DAG.getNode(ISD::BR, getCurDebugLoc(), 1844 MVT::Other, getControlRoot(), 1845 DAG.getBasicBlock(Return))); 1846} 1847 1848void SelectionDAGBuilder::visitResume(const ResumeInst &RI) { 1849 llvm_unreachable("SelectionDAGBuilder shouldn't visit resume instructions!"); 1850} 1851 1852void SelectionDAGBuilder::visitLandingPad(const LandingPadInst &LP) { 1853 assert(FuncInfo.MBB->isLandingPad() && 1854 "Call to landingpad not in landing pad!"); 1855 1856 MachineBasicBlock *MBB = FuncInfo.MBB; 1857 MachineModuleInfo &MMI = DAG.getMachineFunction().getMMI(); 1858 AddLandingPadInfo(LP, MMI, MBB); 1859 1860 // If there aren't registers to copy the values into (e.g., during SjLj 1861 // exceptions), then don't bother to create these DAG nodes. 1862 if (TLI.getExceptionPointerRegister() == 0 && 1863 TLI.getExceptionSelectorRegister() == 0) 1864 return; 1865 1866 SmallVector<EVT, 2> ValueVTs; 1867 ComputeValueVTs(TLI, LP.getType(), ValueVTs); 1868 1869 // Insert the EXCEPTIONADDR instruction. 1870 assert(FuncInfo.MBB->isLandingPad() && 1871 "Call to eh.exception not in landing pad!"); 1872 SDVTList VTs = DAG.getVTList(TLI.getPointerTy(), MVT::Other); 1873 SDValue Ops[2]; 1874 Ops[0] = DAG.getRoot(); 1875 SDValue Op1 = DAG.getNode(ISD::EXCEPTIONADDR, getCurDebugLoc(), VTs, Ops, 1); 1876 SDValue Chain = Op1.getValue(1); 1877 1878 // Insert the EHSELECTION instruction. 1879 VTs = DAG.getVTList(TLI.getPointerTy(), MVT::Other); 1880 Ops[0] = Op1; 1881 Ops[1] = Chain; 1882 SDValue Op2 = DAG.getNode(ISD::EHSELECTION, getCurDebugLoc(), VTs, Ops, 2); 1883 Chain = Op2.getValue(1); 1884 Op2 = DAG.getSExtOrTrunc(Op2, getCurDebugLoc(), MVT::i32); 1885 1886 Ops[0] = Op1; 1887 Ops[1] = Op2; 1888 SDValue Res = DAG.getNode(ISD::MERGE_VALUES, getCurDebugLoc(), 1889 DAG.getVTList(&ValueVTs[0], ValueVTs.size()), 1890 &Ops[0], 2); 1891 1892 std::pair<SDValue, SDValue> RetPair = std::make_pair(Res, Chain); 1893 setValue(&LP, RetPair.first); 1894 DAG.setRoot(RetPair.second); 1895} 1896 1897/// handleSmallSwitchCaseRange - Emit a series of specific tests (suitable for 1898/// small case ranges). 1899bool SelectionDAGBuilder::handleSmallSwitchRange(CaseRec& CR, 1900 CaseRecVector& WorkList, 1901 const Value* SV, 1902 MachineBasicBlock *Default, 1903 MachineBasicBlock *SwitchBB) { 1904 Case& BackCase = *(CR.Range.second-1); 1905 1906 // Size is the number of Cases represented by this range. 1907 size_t Size = CR.Range.second - CR.Range.first; 1908 if (Size > 3) 1909 return false; 1910 1911 // Get the MachineFunction which holds the current MBB. This is used when 1912 // inserting any additional MBBs necessary to represent the switch. 1913 MachineFunction *CurMF = FuncInfo.MF; 1914 1915 // Figure out which block is immediately after the current one. 1916 MachineBasicBlock *NextBlock = 0; 1917 MachineFunction::iterator BBI = CR.CaseBB; 1918 1919 if (++BBI != FuncInfo.MF->end()) 1920 NextBlock = BBI; 1921 1922 // If any two of the cases has the same destination, and if one value 1923 // is the same as the other, but has one bit unset that the other has set, 1924 // use bit manipulation to do two compares at once. For example: 1925 // "if (X == 6 || X == 4)" -> "if ((X|2) == 6)" 1926 // TODO: This could be extended to merge any 2 cases in switches with 3 cases. 1927 // TODO: Handle cases where CR.CaseBB != SwitchBB. 1928 if (Size == 2 && CR.CaseBB == SwitchBB) { 1929 Case &Small = *CR.Range.first; 1930 Case &Big = *(CR.Range.second-1); 1931 1932 if (Small.Low == Small.High && Big.Low == Big.High && Small.BB == Big.BB) { 1933 const APInt& SmallValue = cast<ConstantInt>(Small.Low)->getValue(); 1934 const APInt& BigValue = cast<ConstantInt>(Big.Low)->getValue(); 1935 1936 // Check that there is only one bit different. 1937 if (BigValue.countPopulation() == SmallValue.countPopulation() + 1 && 1938 (SmallValue | BigValue) == BigValue) { 1939 // Isolate the common bit. 1940 APInt CommonBit = BigValue & ~SmallValue; 1941 assert((SmallValue | CommonBit) == BigValue && 1942 CommonBit.countPopulation() == 1 && "Not a common bit?"); 1943 1944 SDValue CondLHS = getValue(SV); 1945 EVT VT = CondLHS.getValueType(); 1946 DebugLoc DL = getCurDebugLoc(); 1947 1948 SDValue Or = DAG.getNode(ISD::OR, DL, VT, CondLHS, 1949 DAG.getConstant(CommonBit, VT)); 1950 SDValue Cond = DAG.getSetCC(DL, MVT::i1, 1951 Or, DAG.getConstant(BigValue, VT), 1952 ISD::SETEQ); 1953 1954 // Update successor info. 1955 addSuccessorWithWeight(SwitchBB, Small.BB); 1956 addSuccessorWithWeight(SwitchBB, Default); 1957 1958 // Insert the true branch. 1959 SDValue BrCond = DAG.getNode(ISD::BRCOND, DL, MVT::Other, 1960 getControlRoot(), Cond, 1961 DAG.getBasicBlock(Small.BB)); 1962 1963 // Insert the false branch. 1964 BrCond = DAG.getNode(ISD::BR, DL, MVT::Other, BrCond, 1965 DAG.getBasicBlock(Default)); 1966 1967 DAG.setRoot(BrCond); 1968 return true; 1969 } 1970 } 1971 } 1972 1973 // Rearrange the case blocks so that the last one falls through if possible. 1974 if (NextBlock && Default != NextBlock && BackCase.BB != NextBlock) { 1975 // The last case block won't fall through into 'NextBlock' if we emit the 1976 // branches in this order. See if rearranging a case value would help. 1977 for (CaseItr I = CR.Range.first, E = CR.Range.second-1; I != E; ++I) { 1978 if (I->BB == NextBlock) { 1979 std::swap(*I, BackCase); 1980 break; 1981 } 1982 } 1983 } 1984 1985 // Create a CaseBlock record representing a conditional branch to 1986 // the Case's target mbb if the value being switched on SV is equal 1987 // to C. 1988 MachineBasicBlock *CurBlock = CR.CaseBB; 1989 for (CaseItr I = CR.Range.first, E = CR.Range.second; I != E; ++I) { 1990 MachineBasicBlock *FallThrough; 1991 if (I != E-1) { 1992 FallThrough = CurMF->CreateMachineBasicBlock(CurBlock->getBasicBlock()); 1993 CurMF->insert(BBI, FallThrough); 1994 1995 // Put SV in a virtual register to make it available from the new blocks. 1996 ExportFromCurrentBlock(SV); 1997 } else { 1998 // If the last case doesn't match, go to the default block. 1999 FallThrough = Default; 2000 } 2001 2002 const Value *RHS, *LHS, *MHS; 2003 ISD::CondCode CC; 2004 if (I->High == I->Low) { 2005 // This is just small small case range :) containing exactly 1 case 2006 CC = ISD::SETEQ; 2007 LHS = SV; RHS = I->High; MHS = NULL; 2008 } else { 2009 CC = ISD::SETLE; 2010 LHS = I->Low; MHS = SV; RHS = I->High; 2011 } 2012 2013 uint32_t ExtraWeight = I->ExtraWeight; 2014 CaseBlock CB(CC, LHS, RHS, MHS, /* truebb */ I->BB, /* falsebb */ FallThrough, 2015 /* me */ CurBlock, 2016 /* trueweight */ ExtraWeight / 2, /* falseweight */ ExtraWeight / 2); 2017 2018 // If emitting the first comparison, just call visitSwitchCase to emit the 2019 // code into the current block. Otherwise, push the CaseBlock onto the 2020 // vector to be later processed by SDISel, and insert the node's MBB 2021 // before the next MBB. 2022 if (CurBlock == SwitchBB) 2023 visitSwitchCase(CB, SwitchBB); 2024 else 2025 SwitchCases.push_back(CB); 2026 2027 CurBlock = FallThrough; 2028 } 2029 2030 return true; 2031} 2032 2033static inline bool areJTsAllowed(const TargetLowering &TLI) { 2034 return !TLI.getTargetMachine().Options.DisableJumpTables && 2035 (TLI.isOperationLegalOrCustom(ISD::BR_JT, MVT::Other) || 2036 TLI.isOperationLegalOrCustom(ISD::BRIND, MVT::Other)); 2037} 2038 2039static APInt ComputeRange(const APInt &First, const APInt &Last) { 2040 uint32_t BitWidth = std::max(Last.getBitWidth(), First.getBitWidth()) + 1; 2041 APInt LastExt = Last.sext(BitWidth), FirstExt = First.sext(BitWidth); 2042 return (LastExt - FirstExt + 1ULL); 2043} 2044 2045/// handleJTSwitchCase - Emit jumptable for current switch case range 2046bool SelectionDAGBuilder::handleJTSwitchCase(CaseRec &CR, 2047 CaseRecVector &WorkList, 2048 const Value *SV, 2049 MachineBasicBlock *Default, 2050 MachineBasicBlock *SwitchBB) { 2051 Case& FrontCase = *CR.Range.first; 2052 Case& BackCase = *(CR.Range.second-1); 2053 2054 const APInt &First = cast<ConstantInt>(FrontCase.Low)->getValue(); 2055 const APInt &Last = cast<ConstantInt>(BackCase.High)->getValue(); 2056 2057 APInt TSize(First.getBitWidth(), 0); 2058 for (CaseItr I = CR.Range.first, E = CR.Range.second; I != E; ++I) 2059 TSize += I->size(); 2060 2061 if (!areJTsAllowed(TLI) || TSize.ult(4)) 2062 return false; 2063 2064 APInt Range = ComputeRange(First, Last); 2065 // The density is TSize / Range. Require at least 40%. 2066 // It should not be possible for IntTSize to saturate for sane code, but make 2067 // sure we handle Range saturation correctly. 2068 uint64_t IntRange = Range.getLimitedValue(UINT64_MAX/10); 2069 uint64_t IntTSize = TSize.getLimitedValue(UINT64_MAX/10); 2070 if (IntTSize * 10 < IntRange * 4) 2071 return false; 2072 2073 DEBUG(dbgs() << "Lowering jump table\n" 2074 << "First entry: " << First << ". Last entry: " << Last << '\n' 2075 << "Range: " << Range << ". Size: " << TSize << ".\n\n"); 2076 2077 // Get the MachineFunction which holds the current MBB. This is used when 2078 // inserting any additional MBBs necessary to represent the switch. 2079 MachineFunction *CurMF = FuncInfo.MF; 2080 2081 // Figure out which block is immediately after the current one. 2082 MachineFunction::iterator BBI = CR.CaseBB; 2083 ++BBI; 2084 2085 const BasicBlock *LLVMBB = CR.CaseBB->getBasicBlock(); 2086 2087 // Create a new basic block to hold the code for loading the address 2088 // of the jump table, and jumping to it. Update successor information; 2089 // we will either branch to the default case for the switch, or the jump 2090 // table. 2091 MachineBasicBlock *JumpTableBB = CurMF->CreateMachineBasicBlock(LLVMBB); 2092 CurMF->insert(BBI, JumpTableBB); 2093 2094 addSuccessorWithWeight(CR.CaseBB, Default); 2095 addSuccessorWithWeight(CR.CaseBB, JumpTableBB); 2096 2097 // Build a vector of destination BBs, corresponding to each target 2098 // of the jump table. If the value of the jump table slot corresponds to 2099 // a case statement, push the case's BB onto the vector, otherwise, push 2100 // the default BB. 2101 std::vector<MachineBasicBlock*> DestBBs; 2102 APInt TEI = First; 2103 for (CaseItr I = CR.Range.first, E = CR.Range.second; I != E; ++TEI) { 2104 const APInt &Low = cast<ConstantInt>(I->Low)->getValue(); 2105 const APInt &High = cast<ConstantInt>(I->High)->getValue(); 2106 2107 if (Low.sle(TEI) && TEI.sle(High)) { 2108 DestBBs.push_back(I->BB); 2109 if (TEI==High) 2110 ++I; 2111 } else { 2112 DestBBs.push_back(Default); 2113 } 2114 } 2115 2116 // Update successor info. Add one edge to each unique successor. 2117 BitVector SuccsHandled(CR.CaseBB->getParent()->getNumBlockIDs()); 2118 for (std::vector<MachineBasicBlock*>::iterator I = DestBBs.begin(), 2119 E = DestBBs.end(); I != E; ++I) { 2120 if (!SuccsHandled[(*I)->getNumber()]) { 2121 SuccsHandled[(*I)->getNumber()] = true; 2122 addSuccessorWithWeight(JumpTableBB, *I); 2123 } 2124 } 2125 2126 // Create a jump table index for this jump table. 2127 unsigned JTEncoding = TLI.getJumpTableEncoding(); 2128 unsigned JTI = CurMF->getOrCreateJumpTableInfo(JTEncoding) 2129 ->createJumpTableIndex(DestBBs); 2130 2131 // Set the jump table information so that we can codegen it as a second 2132 // MachineBasicBlock 2133 JumpTable JT(-1U, JTI, JumpTableBB, Default); 2134 JumpTableHeader JTH(First, Last, SV, CR.CaseBB, (CR.CaseBB == SwitchBB)); 2135 if (CR.CaseBB == SwitchBB) 2136 visitJumpTableHeader(JT, JTH, SwitchBB); 2137 2138 JTCases.push_back(JumpTableBlock(JTH, JT)); 2139 return true; 2140} 2141 2142/// handleBTSplitSwitchCase - emit comparison and split binary search tree into 2143/// 2 subtrees. 2144bool SelectionDAGBuilder::handleBTSplitSwitchCase(CaseRec& CR, 2145 CaseRecVector& WorkList, 2146 const Value* SV, 2147 MachineBasicBlock *Default, 2148 MachineBasicBlock *SwitchBB) { 2149 // Get the MachineFunction which holds the current MBB. This is used when 2150 // inserting any additional MBBs necessary to represent the switch. 2151 MachineFunction *CurMF = FuncInfo.MF; 2152 2153 // Figure out which block is immediately after the current one. 2154 MachineFunction::iterator BBI = CR.CaseBB; 2155 ++BBI; 2156 2157 Case& FrontCase = *CR.Range.first; 2158 Case& BackCase = *(CR.Range.second-1); 2159 const BasicBlock *LLVMBB = CR.CaseBB->getBasicBlock(); 2160 2161 // Size is the number of Cases represented by this range. 2162 unsigned Size = CR.Range.second - CR.Range.first; 2163 2164 const APInt &First = cast<ConstantInt>(FrontCase.Low)->getValue(); 2165 const APInt &Last = cast<ConstantInt>(BackCase.High)->getValue(); 2166 double FMetric = 0; 2167 CaseItr Pivot = CR.Range.first + Size/2; 2168 2169 // Select optimal pivot, maximizing sum density of LHS and RHS. This will 2170 // (heuristically) allow us to emit JumpTable's later. 2171 APInt TSize(First.getBitWidth(), 0); 2172 for (CaseItr I = CR.Range.first, E = CR.Range.second; 2173 I!=E; ++I) 2174 TSize += I->size(); 2175 2176 APInt LSize = FrontCase.size(); 2177 APInt RSize = TSize-LSize; 2178 DEBUG(dbgs() << "Selecting best pivot: \n" 2179 << "First: " << First << ", Last: " << Last <<'\n' 2180 << "LSize: " << LSize << ", RSize: " << RSize << '\n'); 2181 for (CaseItr I = CR.Range.first, J=I+1, E = CR.Range.second; 2182 J!=E; ++I, ++J) { 2183 const APInt &LEnd = cast<ConstantInt>(I->High)->getValue(); 2184 const APInt &RBegin = cast<ConstantInt>(J->Low)->getValue(); 2185 APInt Range = ComputeRange(LEnd, RBegin); 2186 assert((Range - 2ULL).isNonNegative() && 2187 "Invalid case distance"); 2188 // Use volatile double here to avoid excess precision issues on some hosts, 2189 // e.g. that use 80-bit X87 registers. 2190 volatile double LDensity = 2191 (double)LSize.roundToDouble() / 2192 (LEnd - First + 1ULL).roundToDouble(); 2193 volatile double RDensity = 2194 (double)RSize.roundToDouble() / 2195 (Last - RBegin + 1ULL).roundToDouble(); 2196 double Metric = Range.logBase2()*(LDensity+RDensity); 2197 // Should always split in some non-trivial place 2198 DEBUG(dbgs() <<"=>Step\n" 2199 << "LEnd: " << LEnd << ", RBegin: " << RBegin << '\n' 2200 << "LDensity: " << LDensity 2201 << ", RDensity: " << RDensity << '\n' 2202 << "Metric: " << Metric << '\n'); 2203 if (FMetric < Metric) { 2204 Pivot = J; 2205 FMetric = Metric; 2206 DEBUG(dbgs() << "Current metric set to: " << FMetric << '\n'); 2207 } 2208 2209 LSize += J->size(); 2210 RSize -= J->size(); 2211 } 2212 if (areJTsAllowed(TLI)) { 2213 // If our case is dense we *really* should handle it earlier! 2214 assert((FMetric > 0) && "Should handle dense range earlier!"); 2215 } else { 2216 Pivot = CR.Range.first + Size/2; 2217 } 2218 2219 CaseRange LHSR(CR.Range.first, Pivot); 2220 CaseRange RHSR(Pivot, CR.Range.second); 2221 const Constant *C = Pivot->Low; 2222 MachineBasicBlock *FalseBB = 0, *TrueBB = 0; 2223 2224 // We know that we branch to the LHS if the Value being switched on is 2225 // less than the Pivot value, C. We use this to optimize our binary 2226 // tree a bit, by recognizing that if SV is greater than or equal to the 2227 // LHS's Case Value, and that Case Value is exactly one less than the 2228 // Pivot's Value, then we can branch directly to the LHS's Target, 2229 // rather than creating a leaf node for it. 2230 if ((LHSR.second - LHSR.first) == 1 && 2231 LHSR.first->High == CR.GE && 2232 cast<ConstantInt>(C)->getValue() == 2233 (cast<ConstantInt>(CR.GE)->getValue() + 1LL)) { 2234 TrueBB = LHSR.first->BB; 2235 } else { 2236 TrueBB = CurMF->CreateMachineBasicBlock(LLVMBB); 2237 CurMF->insert(BBI, TrueBB); 2238 WorkList.push_back(CaseRec(TrueBB, C, CR.GE, LHSR)); 2239 2240 // Put SV in a virtual register to make it available from the new blocks. 2241 ExportFromCurrentBlock(SV); 2242 } 2243 2244 // Similar to the optimization above, if the Value being switched on is 2245 // known to be less than the Constant CR.LT, and the current Case Value 2246 // is CR.LT - 1, then we can branch directly to the target block for 2247 // the current Case Value, rather than emitting a RHS leaf node for it. 2248 if ((RHSR.second - RHSR.first) == 1 && CR.LT && 2249 cast<ConstantInt>(RHSR.first->Low)->getValue() == 2250 (cast<ConstantInt>(CR.LT)->getValue() - 1LL)) { 2251 FalseBB = RHSR.first->BB; 2252 } else { 2253 FalseBB = CurMF->CreateMachineBasicBlock(LLVMBB); 2254 CurMF->insert(BBI, FalseBB); 2255 WorkList.push_back(CaseRec(FalseBB,CR.LT,C,RHSR)); 2256 2257 // Put SV in a virtual register to make it available from the new blocks. 2258 ExportFromCurrentBlock(SV); 2259 } 2260 2261 // Create a CaseBlock record representing a conditional branch to 2262 // the LHS node if the value being switched on SV is less than C. 2263 // Otherwise, branch to LHS. 2264 CaseBlock CB(ISD::SETLT, SV, C, NULL, TrueBB, FalseBB, CR.CaseBB); 2265 2266 if (CR.CaseBB == SwitchBB) 2267 visitSwitchCase(CB, SwitchBB); 2268 else 2269 SwitchCases.push_back(CB); 2270 2271 return true; 2272} 2273 2274/// handleBitTestsSwitchCase - if current case range has few destination and 2275/// range span less, than machine word bitwidth, encode case range into series 2276/// of masks and emit bit tests with these masks. 2277bool SelectionDAGBuilder::handleBitTestsSwitchCase(CaseRec& CR, 2278 CaseRecVector& WorkList, 2279 const Value* SV, 2280 MachineBasicBlock* Default, 2281 MachineBasicBlock *SwitchBB){ 2282 EVT PTy = TLI.getPointerTy(); 2283 unsigned IntPtrBits = PTy.getSizeInBits(); 2284 2285 Case& FrontCase = *CR.Range.first; 2286 Case& BackCase = *(CR.Range.second-1); 2287 2288 // Get the MachineFunction which holds the current MBB. This is used when 2289 // inserting any additional MBBs necessary to represent the switch. 2290 MachineFunction *CurMF = FuncInfo.MF; 2291 2292 // If target does not have legal shift left, do not emit bit tests at all. 2293 if (!TLI.isOperationLegal(ISD::SHL, TLI.getPointerTy())) 2294 return false; 2295 2296 size_t numCmps = 0; 2297 for (CaseItr I = CR.Range.first, E = CR.Range.second; 2298 I!=E; ++I) { 2299 // Single case counts one, case range - two. 2300 numCmps += (I->Low == I->High ? 1 : 2); 2301 } 2302 2303 // Count unique destinations 2304 SmallSet<MachineBasicBlock*, 4> Dests; 2305 for (CaseItr I = CR.Range.first, E = CR.Range.second; I!=E; ++I) { 2306 Dests.insert(I->BB); 2307 if (Dests.size() > 3) 2308 // Don't bother the code below, if there are too much unique destinations 2309 return false; 2310 } 2311 DEBUG(dbgs() << "Total number of unique destinations: " 2312 << Dests.size() << '\n' 2313 << "Total number of comparisons: " << numCmps << '\n'); 2314 2315 // Compute span of values. 2316 const APInt& minValue = cast<ConstantInt>(FrontCase.Low)->getValue(); 2317 const APInt& maxValue = cast<ConstantInt>(BackCase.High)->getValue(); 2318 APInt cmpRange = maxValue - minValue; 2319 2320 DEBUG(dbgs() << "Compare range: " << cmpRange << '\n' 2321 << "Low bound: " << minValue << '\n' 2322 << "High bound: " << maxValue << '\n'); 2323 2324 if (cmpRange.uge(IntPtrBits) || 2325 (!(Dests.size() == 1 && numCmps >= 3) && 2326 !(Dests.size() == 2 && numCmps >= 5) && 2327 !(Dests.size() >= 3 && numCmps >= 6))) 2328 return false; 2329 2330 DEBUG(dbgs() << "Emitting bit tests\n"); 2331 APInt lowBound = APInt::getNullValue(cmpRange.getBitWidth()); 2332 2333 // Optimize the case where all the case values fit in a 2334 // word without having to subtract minValue. In this case, 2335 // we can optimize away the subtraction. 2336 if (minValue.isNonNegative() && maxValue.slt(IntPtrBits)) { 2337 cmpRange = maxValue; 2338 } else { 2339 lowBound = minValue; 2340 } 2341 2342 CaseBitsVector CasesBits; 2343 unsigned i, count = 0; 2344 2345 for (CaseItr I = CR.Range.first, E = CR.Range.second; I!=E; ++I) { 2346 MachineBasicBlock* Dest = I->BB; 2347 for (i = 0; i < count; ++i) 2348 if (Dest == CasesBits[i].BB) 2349 break; 2350 2351 if (i == count) { 2352 assert((count < 3) && "Too much destinations to test!"); 2353 CasesBits.push_back(CaseBits(0, Dest, 0)); 2354 count++; 2355 } 2356 2357 const APInt& lowValue = cast<ConstantInt>(I->Low)->getValue(); 2358 const APInt& highValue = cast<ConstantInt>(I->High)->getValue(); 2359 2360 uint64_t lo = (lowValue - lowBound).getZExtValue(); 2361 uint64_t hi = (highValue - lowBound).getZExtValue(); 2362 2363 for (uint64_t j = lo; j <= hi; j++) { 2364 CasesBits[i].Mask |= 1ULL << j; 2365 CasesBits[i].Bits++; 2366 } 2367 2368 } 2369 std::sort(CasesBits.begin(), CasesBits.end(), CaseBitsCmp()); 2370 2371 BitTestInfo BTC; 2372 2373 // Figure out which block is immediately after the current one. 2374 MachineFunction::iterator BBI = CR.CaseBB; 2375 ++BBI; 2376 2377 const BasicBlock *LLVMBB = CR.CaseBB->getBasicBlock(); 2378 2379 DEBUG(dbgs() << "Cases:\n"); 2380 for (unsigned i = 0, e = CasesBits.size(); i!=e; ++i) { 2381 DEBUG(dbgs() << "Mask: " << CasesBits[i].Mask 2382 << ", Bits: " << CasesBits[i].Bits 2383 << ", BB: " << CasesBits[i].BB << '\n'); 2384 2385 MachineBasicBlock *CaseBB = CurMF->CreateMachineBasicBlock(LLVMBB); 2386 CurMF->insert(BBI, CaseBB); 2387 BTC.push_back(BitTestCase(CasesBits[i].Mask, 2388 CaseBB, 2389 CasesBits[i].BB)); 2390 2391 // Put SV in a virtual register to make it available from the new blocks. 2392 ExportFromCurrentBlock(SV); 2393 } 2394 2395 BitTestBlock BTB(lowBound, cmpRange, SV, 2396 -1U, MVT::Other, (CR.CaseBB == SwitchBB), 2397 CR.CaseBB, Default, BTC); 2398 2399 if (CR.CaseBB == SwitchBB) 2400 visitBitTestHeader(BTB, SwitchBB); 2401 2402 BitTestCases.push_back(BTB); 2403 2404 return true; 2405} 2406 2407/// Clusterify - Transform simple list of Cases into list of CaseRange's 2408size_t SelectionDAGBuilder::Clusterify(CaseVector& Cases, 2409 const SwitchInst& SI) { 2410 size_t numCmps = 0; 2411 2412 BranchProbabilityInfo *BPI = FuncInfo.BPI; 2413 // Start with "simple" cases 2414 for (size_t i = 0; i < SI.getNumCases(); ++i) { 2415 BasicBlock *SuccBB = SI.getCaseSuccessor(i); 2416 MachineBasicBlock *SMBB = FuncInfo.MBBMap[SuccBB]; 2417 2418 uint32_t ExtraWeight = BPI ? BPI->getEdgeWeight(SI.getParent(), SuccBB) : 0; 2419 2420 Cases.push_back(Case(SI.getCaseValue(i), 2421 SI.getCaseValue(i), 2422 SMBB, ExtraWeight)); 2423 } 2424 std::sort(Cases.begin(), Cases.end(), CaseCmp()); 2425 2426 // Merge case into clusters 2427 if (Cases.size() >= 2) 2428 // Must recompute end() each iteration because it may be 2429 // invalidated by erase if we hold on to it 2430 for (CaseItr I = Cases.begin(), J = llvm::next(Cases.begin()); 2431 J != Cases.end(); ) { 2432 const APInt& nextValue = cast<ConstantInt>(J->Low)->getValue(); 2433 const APInt& currentValue = cast<ConstantInt>(I->High)->getValue(); 2434 MachineBasicBlock* nextBB = J->BB; 2435 MachineBasicBlock* currentBB = I->BB; 2436 2437 // If the two neighboring cases go to the same destination, merge them 2438 // into a single case. 2439 if ((nextValue - currentValue == 1) && (currentBB == nextBB)) { 2440 I->High = J->High; 2441 J = Cases.erase(J); 2442 2443 if (BranchProbabilityInfo *BPI = FuncInfo.BPI) { 2444 uint32_t CurWeight = currentBB->getBasicBlock() ? 2445 BPI->getEdgeWeight(SI.getParent(), currentBB->getBasicBlock()) : 16; 2446 uint32_t NextWeight = nextBB->getBasicBlock() ? 2447 BPI->getEdgeWeight(SI.getParent(), nextBB->getBasicBlock()) : 16; 2448 2449 BPI->setEdgeWeight(SI.getParent(), currentBB->getBasicBlock(), 2450 CurWeight + NextWeight); 2451 } 2452 } else { 2453 I = J++; 2454 } 2455 } 2456 2457 for (CaseItr I=Cases.begin(), E=Cases.end(); I!=E; ++I, ++numCmps) { 2458 if (I->Low != I->High) 2459 // A range counts double, since it requires two compares. 2460 ++numCmps; 2461 } 2462 2463 return numCmps; 2464} 2465 2466void SelectionDAGBuilder::UpdateSplitBlock(MachineBasicBlock *First, 2467 MachineBasicBlock *Last) { 2468 // Update JTCases. 2469 for (unsigned i = 0, e = JTCases.size(); i != e; ++i) 2470 if (JTCases[i].first.HeaderBB == First) 2471 JTCases[i].first.HeaderBB = Last; 2472 2473 // Update BitTestCases. 2474 for (unsigned i = 0, e = BitTestCases.size(); i != e; ++i) 2475 if (BitTestCases[i].Parent == First) 2476 BitTestCases[i].Parent = Last; 2477} 2478 2479void SelectionDAGBuilder::visitSwitch(const SwitchInst &SI) { 2480 MachineBasicBlock *SwitchMBB = FuncInfo.MBB; 2481 2482 // Figure out which block is immediately after the current one. 2483 MachineBasicBlock *NextBlock = 0; 2484 MachineBasicBlock *Default = FuncInfo.MBBMap[SI.getDefaultDest()]; 2485 2486 // If there is only the default destination, branch to it if it is not the 2487 // next basic block. Otherwise, just fall through. 2488 if (!SI.getNumCases()) { 2489 // Update machine-CFG edges. 2490 2491 // If this is not a fall-through branch, emit the branch. 2492 SwitchMBB->addSuccessor(Default); 2493 if (Default != NextBlock) 2494 DAG.setRoot(DAG.getNode(ISD::BR, getCurDebugLoc(), 2495 MVT::Other, getControlRoot(), 2496 DAG.getBasicBlock(Default))); 2497 2498 return; 2499 } 2500 2501 // If there are any non-default case statements, create a vector of Cases 2502 // representing each one, and sort the vector so that we can efficiently 2503 // create a binary search tree from them. 2504 CaseVector Cases; 2505 size_t numCmps = Clusterify(Cases, SI); 2506 DEBUG(dbgs() << "Clusterify finished. Total clusters: " << Cases.size() 2507 << ". Total compares: " << numCmps << '\n'); 2508 (void)numCmps; 2509 2510 // Get the Value to be switched on and default basic blocks, which will be 2511 // inserted into CaseBlock records, representing basic blocks in the binary 2512 // search tree. 2513 const Value *SV = SI.getCondition(); 2514 2515 // Push the initial CaseRec onto the worklist 2516 CaseRecVector WorkList; 2517 WorkList.push_back(CaseRec(SwitchMBB,0,0, 2518 CaseRange(Cases.begin(),Cases.end()))); 2519 2520 while (!WorkList.empty()) { 2521 // Grab a record representing a case range to process off the worklist 2522 CaseRec CR = WorkList.back(); 2523 WorkList.pop_back(); 2524 2525 if (handleBitTestsSwitchCase(CR, WorkList, SV, Default, SwitchMBB)) 2526 continue; 2527 2528 // If the range has few cases (two or less) emit a series of specific 2529 // tests. 2530 if (handleSmallSwitchRange(CR, WorkList, SV, Default, SwitchMBB)) 2531 continue; 2532 2533 // If the switch has more than 5 blocks, and at least 40% dense, and the 2534 // target supports indirect branches, then emit a jump table rather than 2535 // lowering the switch to a binary tree of conditional branches. 2536 if (handleJTSwitchCase(CR, WorkList, SV, Default, SwitchMBB)) 2537 continue; 2538 2539 // Emit binary tree. We need to pick a pivot, and push left and right ranges 2540 // onto the worklist. Leafs are handled via handleSmallSwitchRange() call. 2541 handleBTSplitSwitchCase(CR, WorkList, SV, Default, SwitchMBB); 2542 } 2543} 2544 2545void SelectionDAGBuilder::visitIndirectBr(const IndirectBrInst &I) { 2546 MachineBasicBlock *IndirectBrMBB = FuncInfo.MBB; 2547 2548 // Update machine-CFG edges with unique successors. 2549 SmallVector<BasicBlock*, 32> succs; 2550 succs.reserve(I.getNumSuccessors()); 2551 for (unsigned i = 0, e = I.getNumSuccessors(); i != e; ++i) 2552 succs.push_back(I.getSuccessor(i)); 2553 array_pod_sort(succs.begin(), succs.end()); 2554 succs.erase(std::unique(succs.begin(), succs.end()), succs.end()); 2555 for (unsigned i = 0, e = succs.size(); i != e; ++i) { 2556 MachineBasicBlock *Succ = FuncInfo.MBBMap[succs[i]]; 2557 addSuccessorWithWeight(IndirectBrMBB, Succ); 2558 } 2559 2560 DAG.setRoot(DAG.getNode(ISD::BRIND, getCurDebugLoc(), 2561 MVT::Other, getControlRoot(), 2562 getValue(I.getAddress()))); 2563} 2564 2565void SelectionDAGBuilder::visitFSub(const User &I) { 2566 // -0.0 - X --> fneg 2567 Type *Ty = I.getType(); 2568 if (isa<Constant>(I.getOperand(0)) && 2569 I.getOperand(0) == ConstantFP::getZeroValueForNegation(Ty)) { 2570 SDValue Op2 = getValue(I.getOperand(1)); 2571 setValue(&I, DAG.getNode(ISD::FNEG, getCurDebugLoc(), 2572 Op2.getValueType(), Op2)); 2573 return; 2574 } 2575 2576 visitBinary(I, ISD::FSUB); 2577} 2578 2579void SelectionDAGBuilder::visitBinary(const User &I, unsigned OpCode) { 2580 SDValue Op1 = getValue(I.getOperand(0)); 2581 SDValue Op2 = getValue(I.getOperand(1)); 2582 setValue(&I, DAG.getNode(OpCode, getCurDebugLoc(), 2583 Op1.getValueType(), Op1, Op2)); 2584} 2585 2586void SelectionDAGBuilder::visitShift(const User &I, unsigned Opcode) { 2587 SDValue Op1 = getValue(I.getOperand(0)); 2588 SDValue Op2 = getValue(I.getOperand(1)); 2589 2590 MVT ShiftTy = TLI.getShiftAmountTy(Op2.getValueType()); 2591 2592 // Coerce the shift amount to the right type if we can. 2593 if (!I.getType()->isVectorTy() && Op2.getValueType() != ShiftTy) { 2594 unsigned ShiftSize = ShiftTy.getSizeInBits(); 2595 unsigned Op2Size = Op2.getValueType().getSizeInBits(); 2596 DebugLoc DL = getCurDebugLoc(); 2597 2598 // If the operand is smaller than the shift count type, promote it. 2599 if (ShiftSize > Op2Size) 2600 Op2 = DAG.getNode(ISD::ZERO_EXTEND, DL, ShiftTy, Op2); 2601 2602 // If the operand is larger than the shift count type but the shift 2603 // count type has enough bits to represent any shift value, truncate 2604 // it now. This is a common case and it exposes the truncate to 2605 // optimization early. 2606 else if (ShiftSize >= Log2_32_Ceil(Op2.getValueType().getSizeInBits())) 2607 Op2 = DAG.getNode(ISD::TRUNCATE, DL, ShiftTy, Op2); 2608 // Otherwise we'll need to temporarily settle for some other convenient 2609 // type. Type legalization will make adjustments once the shiftee is split. 2610 else 2611 Op2 = DAG.getZExtOrTrunc(Op2, DL, MVT::i32); 2612 } 2613 2614 setValue(&I, DAG.getNode(Opcode, getCurDebugLoc(), 2615 Op1.getValueType(), Op1, Op2)); 2616} 2617 2618void SelectionDAGBuilder::visitSDiv(const User &I) { 2619 SDValue Op1 = getValue(I.getOperand(0)); 2620 SDValue Op2 = getValue(I.getOperand(1)); 2621 2622 // Turn exact SDivs into multiplications. 2623 // FIXME: This should be in DAGCombiner, but it doesn't have access to the 2624 // exact bit. 2625 if (isa<BinaryOperator>(&I) && cast<BinaryOperator>(&I)->isExact() && 2626 !isa<ConstantSDNode>(Op1) && 2627 isa<ConstantSDNode>(Op2) && !cast<ConstantSDNode>(Op2)->isNullValue()) 2628 setValue(&I, TLI.BuildExactSDIV(Op1, Op2, getCurDebugLoc(), DAG)); 2629 else 2630 setValue(&I, DAG.getNode(ISD::SDIV, getCurDebugLoc(), Op1.getValueType(), 2631 Op1, Op2)); 2632} 2633 2634void SelectionDAGBuilder::visitICmp(const User &I) { 2635 ICmpInst::Predicate predicate = ICmpInst::BAD_ICMP_PREDICATE; 2636 if (const ICmpInst *IC = dyn_cast<ICmpInst>(&I)) 2637 predicate = IC->getPredicate(); 2638 else if (const ConstantExpr *IC = dyn_cast<ConstantExpr>(&I)) 2639 predicate = ICmpInst::Predicate(IC->getPredicate()); 2640 SDValue Op1 = getValue(I.getOperand(0)); 2641 SDValue Op2 = getValue(I.getOperand(1)); 2642 ISD::CondCode Opcode = getICmpCondCode(predicate); 2643 2644 EVT DestVT = TLI.getValueType(I.getType()); 2645 setValue(&I, DAG.getSetCC(getCurDebugLoc(), DestVT, Op1, Op2, Opcode)); 2646} 2647 2648void SelectionDAGBuilder::visitFCmp(const User &I) { 2649 FCmpInst::Predicate predicate = FCmpInst::BAD_FCMP_PREDICATE; 2650 if (const FCmpInst *FC = dyn_cast<FCmpInst>(&I)) 2651 predicate = FC->getPredicate(); 2652 else if (const ConstantExpr *FC = dyn_cast<ConstantExpr>(&I)) 2653 predicate = FCmpInst::Predicate(FC->getPredicate()); 2654 SDValue Op1 = getValue(I.getOperand(0)); 2655 SDValue Op2 = getValue(I.getOperand(1)); 2656 ISD::CondCode Condition = getFCmpCondCode(predicate); 2657 if (TM.Options.NoNaNsFPMath) 2658 Condition = getFCmpCodeWithoutNaN(Condition); 2659 EVT DestVT = TLI.getValueType(I.getType()); 2660 setValue(&I, DAG.getSetCC(getCurDebugLoc(), DestVT, Op1, Op2, Condition)); 2661} 2662 2663void SelectionDAGBuilder::visitSelect(const User &I) { 2664 SmallVector<EVT, 4> ValueVTs; 2665 ComputeValueVTs(TLI, I.getType(), ValueVTs); 2666 unsigned NumValues = ValueVTs.size(); 2667 if (NumValues == 0) return; 2668 2669 SmallVector<SDValue, 4> Values(NumValues); 2670 SDValue Cond = getValue(I.getOperand(0)); 2671 SDValue TrueVal = getValue(I.getOperand(1)); 2672 SDValue FalseVal = getValue(I.getOperand(2)); 2673 ISD::NodeType OpCode = Cond.getValueType().isVector() ? 2674 ISD::VSELECT : ISD::SELECT; 2675 2676 for (unsigned i = 0; i != NumValues; ++i) 2677 Values[i] = DAG.getNode(OpCode, getCurDebugLoc(), 2678 TrueVal.getNode()->getValueType(TrueVal.getResNo()+i), 2679 Cond, 2680 SDValue(TrueVal.getNode(), 2681 TrueVal.getResNo() + i), 2682 SDValue(FalseVal.getNode(), 2683 FalseVal.getResNo() + i)); 2684 2685 setValue(&I, DAG.getNode(ISD::MERGE_VALUES, getCurDebugLoc(), 2686 DAG.getVTList(&ValueVTs[0], NumValues), 2687 &Values[0], NumValues)); 2688} 2689 2690void SelectionDAGBuilder::visitTrunc(const User &I) { 2691 // TruncInst cannot be a no-op cast because sizeof(src) > sizeof(dest). 2692 SDValue N = getValue(I.getOperand(0)); 2693 EVT DestVT = TLI.getValueType(I.getType()); 2694 setValue(&I, DAG.getNode(ISD::TRUNCATE, getCurDebugLoc(), DestVT, N)); 2695} 2696 2697void SelectionDAGBuilder::visitZExt(const User &I) { 2698 // ZExt cannot be a no-op cast because sizeof(src) < sizeof(dest). 2699 // ZExt also can't be a cast to bool for same reason. So, nothing much to do 2700 SDValue N = getValue(I.getOperand(0)); 2701 EVT DestVT = TLI.getValueType(I.getType()); 2702 setValue(&I, DAG.getNode(ISD::ZERO_EXTEND, getCurDebugLoc(), DestVT, N)); 2703} 2704 2705void SelectionDAGBuilder::visitSExt(const User &I) { 2706 // SExt cannot be a no-op cast because sizeof(src) < sizeof(dest). 2707 // SExt also can't be a cast to bool for same reason. So, nothing much to do 2708 SDValue N = getValue(I.getOperand(0)); 2709 EVT DestVT = TLI.getValueType(I.getType()); 2710 setValue(&I, DAG.getNode(ISD::SIGN_EXTEND, getCurDebugLoc(), DestVT, N)); 2711} 2712 2713void SelectionDAGBuilder::visitFPTrunc(const User &I) { 2714 // FPTrunc is never a no-op cast, no need to check 2715 SDValue N = getValue(I.getOperand(0)); 2716 EVT DestVT = TLI.getValueType(I.getType()); 2717 setValue(&I, DAG.getNode(ISD::FP_ROUND, getCurDebugLoc(), 2718 DestVT, N, 2719 DAG.getTargetConstant(0, TLI.getPointerTy()))); 2720} 2721 2722void SelectionDAGBuilder::visitFPExt(const User &I){ 2723 // FPExt is never a no-op cast, no need to check 2724 SDValue N = getValue(I.getOperand(0)); 2725 EVT DestVT = TLI.getValueType(I.getType()); 2726 setValue(&I, DAG.getNode(ISD::FP_EXTEND, getCurDebugLoc(), DestVT, N)); 2727} 2728 2729void SelectionDAGBuilder::visitFPToUI(const User &I) { 2730 // FPToUI is never a no-op cast, no need to check 2731 SDValue N = getValue(I.getOperand(0)); 2732 EVT DestVT = TLI.getValueType(I.getType()); 2733 setValue(&I, DAG.getNode(ISD::FP_TO_UINT, getCurDebugLoc(), DestVT, N)); 2734} 2735 2736void SelectionDAGBuilder::visitFPToSI(const User &I) { 2737 // FPToSI is never a no-op cast, no need to check 2738 SDValue N = getValue(I.getOperand(0)); 2739 EVT DestVT = TLI.getValueType(I.getType()); 2740 setValue(&I, DAG.getNode(ISD::FP_TO_SINT, getCurDebugLoc(), DestVT, N)); 2741} 2742 2743void SelectionDAGBuilder::visitUIToFP(const User &I) { 2744 // UIToFP is never a no-op cast, no need to check 2745 SDValue N = getValue(I.getOperand(0)); 2746 EVT DestVT = TLI.getValueType(I.getType()); 2747 setValue(&I, DAG.getNode(ISD::UINT_TO_FP, getCurDebugLoc(), DestVT, N)); 2748} 2749 2750void SelectionDAGBuilder::visitSIToFP(const User &I){ 2751 // SIToFP is never a no-op cast, no need to check 2752 SDValue N = getValue(I.getOperand(0)); 2753 EVT DestVT = TLI.getValueType(I.getType()); 2754 setValue(&I, DAG.getNode(ISD::SINT_TO_FP, getCurDebugLoc(), DestVT, N)); 2755} 2756 2757void SelectionDAGBuilder::visitPtrToInt(const User &I) { 2758 // What to do depends on the size of the integer and the size of the pointer. 2759 // We can either truncate, zero extend, or no-op, accordingly. 2760 SDValue N = getValue(I.getOperand(0)); 2761 EVT DestVT = TLI.getValueType(I.getType()); 2762 setValue(&I, DAG.getZExtOrTrunc(N, getCurDebugLoc(), DestVT)); 2763} 2764 2765void SelectionDAGBuilder::visitIntToPtr(const User &I) { 2766 // What to do depends on the size of the integer and the size of the pointer. 2767 // We can either truncate, zero extend, or no-op, accordingly. 2768 SDValue N = getValue(I.getOperand(0)); 2769 EVT DestVT = TLI.getValueType(I.getType()); 2770 setValue(&I, DAG.getZExtOrTrunc(N, getCurDebugLoc(), DestVT)); 2771} 2772 2773void SelectionDAGBuilder::visitBitCast(const User &I) { 2774 SDValue N = getValue(I.getOperand(0)); 2775 EVT DestVT = TLI.getValueType(I.getType()); 2776 2777 // BitCast assures us that source and destination are the same size so this is 2778 // either a BITCAST or a no-op. 2779 if (DestVT != N.getValueType()) 2780 setValue(&I, DAG.getNode(ISD::BITCAST, getCurDebugLoc(), 2781 DestVT, N)); // convert types. 2782 else 2783 setValue(&I, N); // noop cast. 2784} 2785 2786void SelectionDAGBuilder::visitInsertElement(const User &I) { 2787 SDValue InVec = getValue(I.getOperand(0)); 2788 SDValue InVal = getValue(I.getOperand(1)); 2789 SDValue InIdx = DAG.getNode(ISD::ZERO_EXTEND, getCurDebugLoc(), 2790 TLI.getPointerTy(), 2791 getValue(I.getOperand(2))); 2792 setValue(&I, DAG.getNode(ISD::INSERT_VECTOR_ELT, getCurDebugLoc(), 2793 TLI.getValueType(I.getType()), 2794 InVec, InVal, InIdx)); 2795} 2796 2797void SelectionDAGBuilder::visitExtractElement(const User &I) { 2798 SDValue InVec = getValue(I.getOperand(0)); 2799 SDValue InIdx = DAG.getNode(ISD::ZERO_EXTEND, getCurDebugLoc(), 2800 TLI.getPointerTy(), 2801 getValue(I.getOperand(1))); 2802 setValue(&I, DAG.getNode(ISD::EXTRACT_VECTOR_ELT, getCurDebugLoc(), 2803 TLI.getValueType(I.getType()), InVec, InIdx)); 2804} 2805 2806// Utility for visitShuffleVector - Return true if every element in Mask, 2807// begining // from position Pos and ending in Pos+Size, falls within the 2808// specified sequential range [L, L+Pos). or is undef. 2809static bool isSequentialInRange(const SmallVectorImpl<int> &Mask, 2810 int Pos, int Size, int Low) { 2811 for (int i = Pos, e = Pos+Size; i != e; ++i, ++Low) 2812 if (Mask[i] >= 0 && Mask[i] != Low) 2813 return false; 2814 return true; 2815} 2816 2817void SelectionDAGBuilder::visitShuffleVector(const User &I) { 2818 SDValue Src1 = getValue(I.getOperand(0)); 2819 SDValue Src2 = getValue(I.getOperand(1)); 2820 2821 SmallVector<int, 8> Mask; 2822 ShuffleVectorInst::getShuffleMask(cast<Constant>(I.getOperand(2)), Mask); 2823 unsigned MaskNumElts = Mask.size(); 2824 2825 EVT VT = TLI.getValueType(I.getType()); 2826 EVT SrcVT = Src1.getValueType(); 2827 unsigned SrcNumElts = SrcVT.getVectorNumElements(); 2828 2829 if (SrcNumElts == MaskNumElts) { 2830 setValue(&I, DAG.getVectorShuffle(VT, getCurDebugLoc(), Src1, Src2, 2831 &Mask[0])); 2832 return; 2833 } 2834 2835 // Normalize the shuffle vector since mask and vector length don't match. 2836 if (SrcNumElts < MaskNumElts && MaskNumElts % SrcNumElts == 0) { 2837 // Mask is longer than the source vectors and is a multiple of the source 2838 // vectors. We can use concatenate vector to make the mask and vectors 2839 // lengths match. 2840 if (SrcNumElts*2 == MaskNumElts) { 2841 // First check for Src1 in low and Src2 in high 2842 if (isSequentialInRange(Mask, 0, SrcNumElts, 0) && 2843 isSequentialInRange(Mask, SrcNumElts, SrcNumElts, SrcNumElts)) { 2844 // The shuffle is concatenating two vectors together. 2845 setValue(&I, DAG.getNode(ISD::CONCAT_VECTORS, getCurDebugLoc(), 2846 VT, Src1, Src2)); 2847 return; 2848 } 2849 // Then check for Src2 in low and Src1 in high 2850 if (isSequentialInRange(Mask, 0, SrcNumElts, SrcNumElts) && 2851 isSequentialInRange(Mask, SrcNumElts, SrcNumElts, 0)) { 2852 // The shuffle is concatenating two vectors together. 2853 setValue(&I, DAG.getNode(ISD::CONCAT_VECTORS, getCurDebugLoc(), 2854 VT, Src2, Src1)); 2855 return; 2856 } 2857 } 2858 2859 // Pad both vectors with undefs to make them the same length as the mask. 2860 unsigned NumConcat = MaskNumElts / SrcNumElts; 2861 bool Src1U = Src1.getOpcode() == ISD::UNDEF; 2862 bool Src2U = Src2.getOpcode() == ISD::UNDEF; 2863 SDValue UndefVal = DAG.getUNDEF(SrcVT); 2864 2865 SmallVector<SDValue, 8> MOps1(NumConcat, UndefVal); 2866 SmallVector<SDValue, 8> MOps2(NumConcat, UndefVal); 2867 MOps1[0] = Src1; 2868 MOps2[0] = Src2; 2869 2870 Src1 = Src1U ? DAG.getUNDEF(VT) : DAG.getNode(ISD::CONCAT_VECTORS, 2871 getCurDebugLoc(), VT, 2872 &MOps1[0], NumConcat); 2873 Src2 = Src2U ? DAG.getUNDEF(VT) : DAG.getNode(ISD::CONCAT_VECTORS, 2874 getCurDebugLoc(), VT, 2875 &MOps2[0], NumConcat); 2876 2877 // Readjust mask for new input vector length. 2878 SmallVector<int, 8> MappedOps; 2879 for (unsigned i = 0; i != MaskNumElts; ++i) { 2880 int Idx = Mask[i]; 2881 if (Idx < (int)SrcNumElts) 2882 MappedOps.push_back(Idx); 2883 else 2884 MappedOps.push_back(Idx + MaskNumElts - SrcNumElts); 2885 } 2886 2887 setValue(&I, DAG.getVectorShuffle(VT, getCurDebugLoc(), Src1, Src2, 2888 &MappedOps[0])); 2889 return; 2890 } 2891 2892 if (SrcNumElts > MaskNumElts) { 2893 // Analyze the access pattern of the vector to see if we can extract 2894 // two subvectors and do the shuffle. The analysis is done by calculating 2895 // the range of elements the mask access on both vectors. 2896 int MinRange[2] = { static_cast<int>(SrcNumElts+1), 2897 static_cast<int>(SrcNumElts+1)}; 2898 int MaxRange[2] = {-1, -1}; 2899 2900 for (unsigned i = 0; i != MaskNumElts; ++i) { 2901 int Idx = Mask[i]; 2902 int Input = 0; 2903 if (Idx < 0) 2904 continue; 2905 2906 if (Idx >= (int)SrcNumElts) { 2907 Input = 1; 2908 Idx -= SrcNumElts; 2909 } 2910 if (Idx > MaxRange[Input]) 2911 MaxRange[Input] = Idx; 2912 if (Idx < MinRange[Input]) 2913 MinRange[Input] = Idx; 2914 } 2915 2916 // Check if the access is smaller than the vector size and can we find 2917 // a reasonable extract index. 2918 int RangeUse[2] = { 2, 2 }; // 0 = Unused, 1 = Extract, 2 = Can not 2919 // Extract. 2920 int StartIdx[2]; // StartIdx to extract from 2921 for (int Input=0; Input < 2; ++Input) { 2922 if (MinRange[Input] == (int)(SrcNumElts+1) && MaxRange[Input] == -1) { 2923 RangeUse[Input] = 0; // Unused 2924 StartIdx[Input] = 0; 2925 } else if (MaxRange[Input] - MinRange[Input] < (int)MaskNumElts) { 2926 // Fits within range but we should see if we can find a good 2927 // start index that is a multiple of the mask length. 2928 if (MaxRange[Input] < (int)MaskNumElts) { 2929 RangeUse[Input] = 1; // Extract from beginning of the vector 2930 StartIdx[Input] = 0; 2931 } else { 2932 StartIdx[Input] = (MinRange[Input]/MaskNumElts)*MaskNumElts; 2933 if (MaxRange[Input] - StartIdx[Input] < (int)MaskNumElts && 2934 StartIdx[Input] + MaskNumElts <= SrcNumElts) 2935 RangeUse[Input] = 1; // Extract from a multiple of the mask length. 2936 } 2937 } 2938 } 2939 2940 if (RangeUse[0] == 0 && RangeUse[1] == 0) { 2941 setValue(&I, DAG.getUNDEF(VT)); // Vectors are not used. 2942 return; 2943 } 2944 else if (RangeUse[0] < 2 && RangeUse[1] < 2) { 2945 // Extract appropriate subvector and generate a vector shuffle 2946 for (int Input=0; Input < 2; ++Input) { 2947 SDValue &Src = Input == 0 ? Src1 : Src2; 2948 if (RangeUse[Input] == 0) 2949 Src = DAG.getUNDEF(VT); 2950 else 2951 Src = DAG.getNode(ISD::EXTRACT_SUBVECTOR, getCurDebugLoc(), VT, 2952 Src, DAG.getIntPtrConstant(StartIdx[Input])); 2953 } 2954 2955 // Calculate new mask. 2956 SmallVector<int, 8> MappedOps; 2957 for (unsigned i = 0; i != MaskNumElts; ++i) { 2958 int Idx = Mask[i]; 2959 if (Idx < 0) 2960 MappedOps.push_back(Idx); 2961 else if (Idx < (int)SrcNumElts) 2962 MappedOps.push_back(Idx - StartIdx[0]); 2963 else 2964 MappedOps.push_back(Idx - SrcNumElts - StartIdx[1] + MaskNumElts); 2965 } 2966 2967 setValue(&I, DAG.getVectorShuffle(VT, getCurDebugLoc(), Src1, Src2, 2968 &MappedOps[0])); 2969 return; 2970 } 2971 } 2972 2973 // We can't use either concat vectors or extract subvectors so fall back to 2974 // replacing the shuffle with extract and build vector. 2975 // to insert and build vector. 2976 EVT EltVT = VT.getVectorElementType(); 2977 EVT PtrVT = TLI.getPointerTy(); 2978 SmallVector<SDValue,8> Ops; 2979 for (unsigned i = 0; i != MaskNumElts; ++i) { 2980 if (Mask[i] < 0) { 2981 Ops.push_back(DAG.getUNDEF(EltVT)); 2982 } else { 2983 int Idx = Mask[i]; 2984 SDValue Res; 2985 2986 if (Idx < (int)SrcNumElts) 2987 Res = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, getCurDebugLoc(), 2988 EltVT, Src1, DAG.getConstant(Idx, PtrVT)); 2989 else 2990 Res = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, getCurDebugLoc(), 2991 EltVT, Src2, 2992 DAG.getConstant(Idx - SrcNumElts, PtrVT)); 2993 2994 Ops.push_back(Res); 2995 } 2996 } 2997 2998 setValue(&I, DAG.getNode(ISD::BUILD_VECTOR, getCurDebugLoc(), 2999 VT, &Ops[0], Ops.size())); 3000} 3001 3002void SelectionDAGBuilder::visitInsertValue(const InsertValueInst &I) { 3003 const Value *Op0 = I.getOperand(0); 3004 const Value *Op1 = I.getOperand(1); 3005 Type *AggTy = I.getType(); 3006 Type *ValTy = Op1->getType(); 3007 bool IntoUndef = isa<UndefValue>(Op0); 3008 bool FromUndef = isa<UndefValue>(Op1); 3009 3010 unsigned LinearIndex = ComputeLinearIndex(AggTy, I.getIndices()); 3011 3012 SmallVector<EVT, 4> AggValueVTs; 3013 ComputeValueVTs(TLI, AggTy, AggValueVTs); 3014 SmallVector<EVT, 4> ValValueVTs; 3015 ComputeValueVTs(TLI, ValTy, ValValueVTs); 3016 3017 unsigned NumAggValues = AggValueVTs.size(); 3018 unsigned NumValValues = ValValueVTs.size(); 3019 SmallVector<SDValue, 4> Values(NumAggValues); 3020 3021 SDValue Agg = getValue(Op0); 3022 unsigned i = 0; 3023 // Copy the beginning value(s) from the original aggregate. 3024 for (; i != LinearIndex; ++i) 3025 Values[i] = IntoUndef ? DAG.getUNDEF(AggValueVTs[i]) : 3026 SDValue(Agg.getNode(), Agg.getResNo() + i); 3027 // Copy values from the inserted value(s). 3028 if (NumValValues) { 3029 SDValue Val = getValue(Op1); 3030 for (; i != LinearIndex + NumValValues; ++i) 3031 Values[i] = FromUndef ? DAG.getUNDEF(AggValueVTs[i]) : 3032 SDValue(Val.getNode(), Val.getResNo() + i - LinearIndex); 3033 } 3034 // Copy remaining value(s) from the original aggregate. 3035 for (; i != NumAggValues; ++i) 3036 Values[i] = IntoUndef ? DAG.getUNDEF(AggValueVTs[i]) : 3037 SDValue(Agg.getNode(), Agg.getResNo() + i); 3038 3039 setValue(&I, DAG.getNode(ISD::MERGE_VALUES, getCurDebugLoc(), 3040 DAG.getVTList(&AggValueVTs[0], NumAggValues), 3041 &Values[0], NumAggValues)); 3042} 3043 3044void SelectionDAGBuilder::visitExtractValue(const ExtractValueInst &I) { 3045 const Value *Op0 = I.getOperand(0); 3046 Type *AggTy = Op0->getType(); 3047 Type *ValTy = I.getType(); 3048 bool OutOfUndef = isa<UndefValue>(Op0); 3049 3050 unsigned LinearIndex = ComputeLinearIndex(AggTy, I.getIndices()); 3051 3052 SmallVector<EVT, 4> ValValueVTs; 3053 ComputeValueVTs(TLI, ValTy, ValValueVTs); 3054 3055 unsigned NumValValues = ValValueVTs.size(); 3056 3057 // Ignore a extractvalue that produces an empty object 3058 if (!NumValValues) { 3059 setValue(&I, DAG.getUNDEF(MVT(MVT::Other))); 3060 return; 3061 } 3062 3063 SmallVector<SDValue, 4> Values(NumValValues); 3064 3065 SDValue Agg = getValue(Op0); 3066 // Copy out the selected value(s). 3067 for (unsigned i = LinearIndex; i != LinearIndex + NumValValues; ++i) 3068 Values[i - LinearIndex] = 3069 OutOfUndef ? 3070 DAG.getUNDEF(Agg.getNode()->getValueType(Agg.getResNo() + i)) : 3071 SDValue(Agg.getNode(), Agg.getResNo() + i); 3072 3073 setValue(&I, DAG.getNode(ISD::MERGE_VALUES, getCurDebugLoc(), 3074 DAG.getVTList(&ValValueVTs[0], NumValValues), 3075 &Values[0], NumValValues)); 3076} 3077 3078void SelectionDAGBuilder::visitGetElementPtr(const User &I) { 3079 SDValue N = getValue(I.getOperand(0)); 3080 // Note that the pointer operand may be a vector of pointers. Take the scalar 3081 // element which holds a pointer. 3082 Type *Ty = I.getOperand(0)->getType()->getScalarType(); 3083 3084 for (GetElementPtrInst::const_op_iterator OI = I.op_begin()+1, E = I.op_end(); 3085 OI != E; ++OI) { 3086 const Value *Idx = *OI; 3087 if (StructType *StTy = dyn_cast<StructType>(Ty)) { 3088 unsigned Field = cast<ConstantInt>(Idx)->getZExtValue(); 3089 if (Field) { 3090 // N = N + Offset 3091 uint64_t Offset = TD->getStructLayout(StTy)->getElementOffset(Field); 3092 N = DAG.getNode(ISD::ADD, getCurDebugLoc(), N.getValueType(), N, 3093 DAG.getIntPtrConstant(Offset)); 3094 } 3095 3096 Ty = StTy->getElementType(Field); 3097 } else { 3098 Ty = cast<SequentialType>(Ty)->getElementType(); 3099 3100 // If this is a constant subscript, handle it quickly. 3101 if (const ConstantInt *CI = dyn_cast<ConstantInt>(Idx)) { 3102 if (CI->isZero()) continue; 3103 uint64_t Offs = 3104 TD->getTypeAllocSize(Ty)*cast<ConstantInt>(CI)->getSExtValue(); 3105 SDValue OffsVal; 3106 EVT PTy = TLI.getPointerTy(); 3107 unsigned PtrBits = PTy.getSizeInBits(); 3108 if (PtrBits < 64) 3109 OffsVal = DAG.getNode(ISD::TRUNCATE, getCurDebugLoc(), 3110 TLI.getPointerTy(), 3111 DAG.getConstant(Offs, MVT::i64)); 3112 else 3113 OffsVal = DAG.getIntPtrConstant(Offs); 3114 3115 N = DAG.getNode(ISD::ADD, getCurDebugLoc(), N.getValueType(), N, 3116 OffsVal); 3117 continue; 3118 } 3119 3120 // N = N + Idx * ElementSize; 3121 APInt ElementSize = APInt(TLI.getPointerTy().getSizeInBits(), 3122 TD->getTypeAllocSize(Ty)); 3123 SDValue IdxN = getValue(Idx); 3124 3125 // If the index is smaller or larger than intptr_t, truncate or extend 3126 // it. 3127 IdxN = DAG.getSExtOrTrunc(IdxN, getCurDebugLoc(), N.getValueType()); 3128 3129 // If this is a multiply by a power of two, turn it into a shl 3130 // immediately. This is a very common case. 3131 if (ElementSize != 1) { 3132 if (ElementSize.isPowerOf2()) { 3133 unsigned Amt = ElementSize.logBase2(); 3134 IdxN = DAG.getNode(ISD::SHL, getCurDebugLoc(), 3135 N.getValueType(), IdxN, 3136 DAG.getConstant(Amt, IdxN.getValueType())); 3137 } else { 3138 SDValue Scale = DAG.getConstant(ElementSize, TLI.getPointerTy()); 3139 IdxN = DAG.getNode(ISD::MUL, getCurDebugLoc(), 3140 N.getValueType(), IdxN, Scale); 3141 } 3142 } 3143 3144 N = DAG.getNode(ISD::ADD, getCurDebugLoc(), 3145 N.getValueType(), N, IdxN); 3146 } 3147 } 3148 3149 setValue(&I, N); 3150} 3151 3152void SelectionDAGBuilder::visitAlloca(const AllocaInst &I) { 3153 // If this is a fixed sized alloca in the entry block of the function, 3154 // allocate it statically on the stack. 3155 if (FuncInfo.StaticAllocaMap.count(&I)) 3156 return; // getValue will auto-populate this. 3157 3158 Type *Ty = I.getAllocatedType(); 3159 uint64_t TySize = TLI.getTargetData()->getTypeAllocSize(Ty); 3160 unsigned Align = 3161 std::max((unsigned)TLI.getTargetData()->getPrefTypeAlignment(Ty), 3162 I.getAlignment()); 3163 3164 SDValue AllocSize = getValue(I.getArraySize()); 3165 3166 EVT IntPtr = TLI.getPointerTy(); 3167 if (AllocSize.getValueType() != IntPtr) 3168 AllocSize = DAG.getZExtOrTrunc(AllocSize, getCurDebugLoc(), IntPtr); 3169 3170 AllocSize = DAG.getNode(ISD::MUL, getCurDebugLoc(), IntPtr, 3171 AllocSize, 3172 DAG.getConstant(TySize, IntPtr)); 3173 3174 // Handle alignment. If the requested alignment is less than or equal to 3175 // the stack alignment, ignore it. If the size is greater than or equal to 3176 // the stack alignment, we note this in the DYNAMIC_STACKALLOC node. 3177 unsigned StackAlign = TM.getFrameLowering()->getStackAlignment(); 3178 if (Align <= StackAlign) 3179 Align = 0; 3180 3181 // Round the size of the allocation up to the stack alignment size 3182 // by add SA-1 to the size. 3183 AllocSize = DAG.getNode(ISD::ADD, getCurDebugLoc(), 3184 AllocSize.getValueType(), AllocSize, 3185 DAG.getIntPtrConstant(StackAlign-1)); 3186 3187 // Mask out the low bits for alignment purposes. 3188 AllocSize = DAG.getNode(ISD::AND, getCurDebugLoc(), 3189 AllocSize.getValueType(), AllocSize, 3190 DAG.getIntPtrConstant(~(uint64_t)(StackAlign-1))); 3191 3192 SDValue Ops[] = { getRoot(), AllocSize, DAG.getIntPtrConstant(Align) }; 3193 SDVTList VTs = DAG.getVTList(AllocSize.getValueType(), MVT::Other); 3194 SDValue DSA = DAG.getNode(ISD::DYNAMIC_STACKALLOC, getCurDebugLoc(), 3195 VTs, Ops, 3); 3196 setValue(&I, DSA); 3197 DAG.setRoot(DSA.getValue(1)); 3198 3199 // Inform the Frame Information that we have just allocated a variable-sized 3200 // object. 3201 FuncInfo.MF->getFrameInfo()->CreateVariableSizedObject(Align ? Align : 1); 3202} 3203 3204void SelectionDAGBuilder::visitLoad(const LoadInst &I) { 3205 if (I.isAtomic()) 3206 return visitAtomicLoad(I); 3207 3208 const Value *SV = I.getOperand(0); 3209 SDValue Ptr = getValue(SV); 3210 3211 Type *Ty = I.getType(); 3212 3213 bool isVolatile = I.isVolatile(); 3214 bool isNonTemporal = I.getMetadata("nontemporal") != 0; 3215 bool isInvariant = I.getMetadata("invariant.load") != 0; 3216 unsigned Alignment = I.getAlignment(); 3217 const MDNode *TBAAInfo = I.getMetadata(LLVMContext::MD_tbaa); 3218 3219 SmallVector<EVT, 4> ValueVTs; 3220 SmallVector<uint64_t, 4> Offsets; 3221 ComputeValueVTs(TLI, Ty, ValueVTs, &Offsets); 3222 unsigned NumValues = ValueVTs.size(); 3223 if (NumValues == 0) 3224 return; 3225 3226 SDValue Root; 3227 bool ConstantMemory = false; 3228 if (I.isVolatile() || NumValues > MaxParallelChains) 3229 // Serialize volatile loads with other side effects. 3230 Root = getRoot(); 3231 else if (AA->pointsToConstantMemory( 3232 AliasAnalysis::Location(SV, AA->getTypeStoreSize(Ty), TBAAInfo))) { 3233 // Do not serialize (non-volatile) loads of constant memory with anything. 3234 Root = DAG.getEntryNode(); 3235 ConstantMemory = true; 3236 } else { 3237 // Do not serialize non-volatile loads against each other. 3238 Root = DAG.getRoot(); 3239 } 3240 3241 SmallVector<SDValue, 4> Values(NumValues); 3242 SmallVector<SDValue, 4> Chains(std::min(unsigned(MaxParallelChains), 3243 NumValues)); 3244 EVT PtrVT = Ptr.getValueType(); 3245 unsigned ChainI = 0; 3246 for (unsigned i = 0; i != NumValues; ++i, ++ChainI) { 3247 // Serializing loads here may result in excessive register pressure, and 3248 // TokenFactor places arbitrary choke points on the scheduler. SD scheduling 3249 // could recover a bit by hoisting nodes upward in the chain by recognizing 3250 // they are side-effect free or do not alias. The optimizer should really 3251 // avoid this case by converting large object/array copies to llvm.memcpy 3252 // (MaxParallelChains should always remain as failsafe). 3253 if (ChainI == MaxParallelChains) { 3254 assert(PendingLoads.empty() && "PendingLoads must be serialized first"); 3255 SDValue Chain = DAG.getNode(ISD::TokenFactor, getCurDebugLoc(), 3256 MVT::Other, &Chains[0], ChainI); 3257 Root = Chain; 3258 ChainI = 0; 3259 } 3260 SDValue A = DAG.getNode(ISD::ADD, getCurDebugLoc(), 3261 PtrVT, Ptr, 3262 DAG.getConstant(Offsets[i], PtrVT)); 3263 SDValue L = DAG.getLoad(ValueVTs[i], getCurDebugLoc(), Root, 3264 A, MachinePointerInfo(SV, Offsets[i]), isVolatile, 3265 isNonTemporal, isInvariant, Alignment, TBAAInfo); 3266 3267 Values[i] = L; 3268 Chains[ChainI] = L.getValue(1); 3269 } 3270 3271 if (!ConstantMemory) { 3272 SDValue Chain = DAG.getNode(ISD::TokenFactor, getCurDebugLoc(), 3273 MVT::Other, &Chains[0], ChainI); 3274 if (isVolatile) 3275 DAG.setRoot(Chain); 3276 else 3277 PendingLoads.push_back(Chain); 3278 } 3279 3280 setValue(&I, DAG.getNode(ISD::MERGE_VALUES, getCurDebugLoc(), 3281 DAG.getVTList(&ValueVTs[0], NumValues), 3282 &Values[0], NumValues)); 3283} 3284 3285void SelectionDAGBuilder::visitStore(const StoreInst &I) { 3286 if (I.isAtomic()) 3287 return visitAtomicStore(I); 3288 3289 const Value *SrcV = I.getOperand(0); 3290 const Value *PtrV = I.getOperand(1); 3291 3292 SmallVector<EVT, 4> ValueVTs; 3293 SmallVector<uint64_t, 4> Offsets; 3294 ComputeValueVTs(TLI, SrcV->getType(), ValueVTs, &Offsets); 3295 unsigned NumValues = ValueVTs.size(); 3296 if (NumValues == 0) 3297 return; 3298 3299 // Get the lowered operands. Note that we do this after 3300 // checking if NumResults is zero, because with zero results 3301 // the operands won't have values in the map. 3302 SDValue Src = getValue(SrcV); 3303 SDValue Ptr = getValue(PtrV); 3304 3305 SDValue Root = getRoot(); 3306 SmallVector<SDValue, 4> Chains(std::min(unsigned(MaxParallelChains), 3307 NumValues)); 3308 EVT PtrVT = Ptr.getValueType(); 3309 bool isVolatile = I.isVolatile(); 3310 bool isNonTemporal = I.getMetadata("nontemporal") != 0; 3311 unsigned Alignment = I.getAlignment(); 3312 const MDNode *TBAAInfo = I.getMetadata(LLVMContext::MD_tbaa); 3313 3314 unsigned ChainI = 0; 3315 for (unsigned i = 0; i != NumValues; ++i, ++ChainI) { 3316 // See visitLoad comments. 3317 if (ChainI == MaxParallelChains) { 3318 SDValue Chain = DAG.getNode(ISD::TokenFactor, getCurDebugLoc(), 3319 MVT::Other, &Chains[0], ChainI); 3320 Root = Chain; 3321 ChainI = 0; 3322 } 3323 SDValue Add = DAG.getNode(ISD::ADD, getCurDebugLoc(), PtrVT, Ptr, 3324 DAG.getConstant(Offsets[i], PtrVT)); 3325 SDValue St = DAG.getStore(Root, getCurDebugLoc(), 3326 SDValue(Src.getNode(), Src.getResNo() + i), 3327 Add, MachinePointerInfo(PtrV, Offsets[i]), 3328 isVolatile, isNonTemporal, Alignment, TBAAInfo); 3329 Chains[ChainI] = St; 3330 } 3331 3332 SDValue StoreNode = DAG.getNode(ISD::TokenFactor, getCurDebugLoc(), 3333 MVT::Other, &Chains[0], ChainI); 3334 ++SDNodeOrder; 3335 AssignOrderingToNode(StoreNode.getNode()); 3336 DAG.setRoot(StoreNode); 3337} 3338 3339static SDValue InsertFenceForAtomic(SDValue Chain, AtomicOrdering Order, 3340 SynchronizationScope Scope, 3341 bool Before, DebugLoc dl, 3342 SelectionDAG &DAG, 3343 const TargetLowering &TLI) { 3344 // Fence, if necessary 3345 if (Before) { 3346 if (Order == AcquireRelease || Order == SequentiallyConsistent) 3347 Order = Release; 3348 else if (Order == Acquire || Order == Monotonic) 3349 return Chain; 3350 } else { 3351 if (Order == AcquireRelease) 3352 Order = Acquire; 3353 else if (Order == Release || Order == Monotonic) 3354 return Chain; 3355 } 3356 SDValue Ops[3]; 3357 Ops[0] = Chain; 3358 Ops[1] = DAG.getConstant(Order, TLI.getPointerTy()); 3359 Ops[2] = DAG.getConstant(Scope, TLI.getPointerTy()); 3360 return DAG.getNode(ISD::ATOMIC_FENCE, dl, MVT::Other, Ops, 3); 3361} 3362 3363void SelectionDAGBuilder::visitAtomicCmpXchg(const AtomicCmpXchgInst &I) { 3364 DebugLoc dl = getCurDebugLoc(); 3365 AtomicOrdering Order = I.getOrdering(); 3366 SynchronizationScope Scope = I.getSynchScope(); 3367 3368 SDValue InChain = getRoot(); 3369 3370 if (TLI.getInsertFencesForAtomic()) 3371 InChain = InsertFenceForAtomic(InChain, Order, Scope, true, dl, 3372 DAG, TLI); 3373 3374 SDValue L = 3375 DAG.getAtomic(ISD::ATOMIC_CMP_SWAP, dl, 3376 getValue(I.getCompareOperand()).getValueType().getSimpleVT(), 3377 InChain, 3378 getValue(I.getPointerOperand()), 3379 getValue(I.getCompareOperand()), 3380 getValue(I.getNewValOperand()), 3381 MachinePointerInfo(I.getPointerOperand()), 0 /* Alignment */, 3382 TLI.getInsertFencesForAtomic() ? Monotonic : Order, 3383 Scope); 3384 3385 SDValue OutChain = L.getValue(1); 3386 3387 if (TLI.getInsertFencesForAtomic()) 3388 OutChain = InsertFenceForAtomic(OutChain, Order, Scope, false, dl, 3389 DAG, TLI); 3390 3391 setValue(&I, L); 3392 DAG.setRoot(OutChain); 3393} 3394 3395void SelectionDAGBuilder::visitAtomicRMW(const AtomicRMWInst &I) { 3396 DebugLoc dl = getCurDebugLoc(); 3397 ISD::NodeType NT; 3398 switch (I.getOperation()) { 3399 default: llvm_unreachable("Unknown atomicrmw operation"); 3400 case AtomicRMWInst::Xchg: NT = ISD::ATOMIC_SWAP; break; 3401 case AtomicRMWInst::Add: NT = ISD::ATOMIC_LOAD_ADD; break; 3402 case AtomicRMWInst::Sub: NT = ISD::ATOMIC_LOAD_SUB; break; 3403 case AtomicRMWInst::And: NT = ISD::ATOMIC_LOAD_AND; break; 3404 case AtomicRMWInst::Nand: NT = ISD::ATOMIC_LOAD_NAND; break; 3405 case AtomicRMWInst::Or: NT = ISD::ATOMIC_LOAD_OR; break; 3406 case AtomicRMWInst::Xor: NT = ISD::ATOMIC_LOAD_XOR; break; 3407 case AtomicRMWInst::Max: NT = ISD::ATOMIC_LOAD_MAX; break; 3408 case AtomicRMWInst::Min: NT = ISD::ATOMIC_LOAD_MIN; break; 3409 case AtomicRMWInst::UMax: NT = ISD::ATOMIC_LOAD_UMAX; break; 3410 case AtomicRMWInst::UMin: NT = ISD::ATOMIC_LOAD_UMIN; break; 3411 } 3412 AtomicOrdering Order = I.getOrdering(); 3413 SynchronizationScope Scope = I.getSynchScope(); 3414 3415 SDValue InChain = getRoot(); 3416 3417 if (TLI.getInsertFencesForAtomic()) 3418 InChain = InsertFenceForAtomic(InChain, Order, Scope, true, dl, 3419 DAG, TLI); 3420 3421 SDValue L = 3422 DAG.getAtomic(NT, dl, 3423 getValue(I.getValOperand()).getValueType().getSimpleVT(), 3424 InChain, 3425 getValue(I.getPointerOperand()), 3426 getValue(I.getValOperand()), 3427 I.getPointerOperand(), 0 /* Alignment */, 3428 TLI.getInsertFencesForAtomic() ? Monotonic : Order, 3429 Scope); 3430 3431 SDValue OutChain = L.getValue(1); 3432 3433 if (TLI.getInsertFencesForAtomic()) 3434 OutChain = InsertFenceForAtomic(OutChain, Order, Scope, false, dl, 3435 DAG, TLI); 3436 3437 setValue(&I, L); 3438 DAG.setRoot(OutChain); 3439} 3440 3441void SelectionDAGBuilder::visitFence(const FenceInst &I) { 3442 DebugLoc dl = getCurDebugLoc(); 3443 SDValue Ops[3]; 3444 Ops[0] = getRoot(); 3445 Ops[1] = DAG.getConstant(I.getOrdering(), TLI.getPointerTy()); 3446 Ops[2] = DAG.getConstant(I.getSynchScope(), TLI.getPointerTy()); 3447 DAG.setRoot(DAG.getNode(ISD::ATOMIC_FENCE, dl, MVT::Other, Ops, 3)); 3448} 3449 3450void SelectionDAGBuilder::visitAtomicLoad(const LoadInst &I) { 3451 DebugLoc dl = getCurDebugLoc(); 3452 AtomicOrdering Order = I.getOrdering(); 3453 SynchronizationScope Scope = I.getSynchScope(); 3454 3455 SDValue InChain = getRoot(); 3456 3457 EVT VT = EVT::getEVT(I.getType()); 3458 3459 if (I.getAlignment() * 8 < VT.getSizeInBits()) 3460 report_fatal_error("Cannot generate unaligned atomic load"); 3461 3462 SDValue L = 3463 DAG.getAtomic(ISD::ATOMIC_LOAD, dl, VT, VT, InChain, 3464 getValue(I.getPointerOperand()), 3465 I.getPointerOperand(), I.getAlignment(), 3466 TLI.getInsertFencesForAtomic() ? Monotonic : Order, 3467 Scope); 3468 3469 SDValue OutChain = L.getValue(1); 3470 3471 if (TLI.getInsertFencesForAtomic()) 3472 OutChain = InsertFenceForAtomic(OutChain, Order, Scope, false, dl, 3473 DAG, TLI); 3474 3475 setValue(&I, L); 3476 DAG.setRoot(OutChain); 3477} 3478 3479void SelectionDAGBuilder::visitAtomicStore(const StoreInst &I) { 3480 DebugLoc dl = getCurDebugLoc(); 3481 3482 AtomicOrdering Order = I.getOrdering(); 3483 SynchronizationScope Scope = I.getSynchScope(); 3484 3485 SDValue InChain = getRoot(); 3486 3487 EVT VT = EVT::getEVT(I.getValueOperand()->getType()); 3488 3489 if (I.getAlignment() * 8 < VT.getSizeInBits()) 3490 report_fatal_error("Cannot generate unaligned atomic store"); 3491 3492 if (TLI.getInsertFencesForAtomic()) 3493 InChain = InsertFenceForAtomic(InChain, Order, Scope, true, dl, 3494 DAG, TLI); 3495 3496 SDValue OutChain = 3497 DAG.getAtomic(ISD::ATOMIC_STORE, dl, VT, 3498 InChain, 3499 getValue(I.getPointerOperand()), 3500 getValue(I.getValueOperand()), 3501 I.getPointerOperand(), I.getAlignment(), 3502 TLI.getInsertFencesForAtomic() ? Monotonic : Order, 3503 Scope); 3504 3505 if (TLI.getInsertFencesForAtomic()) 3506 OutChain = InsertFenceForAtomic(OutChain, Order, Scope, false, dl, 3507 DAG, TLI); 3508 3509 DAG.setRoot(OutChain); 3510} 3511 3512/// visitTargetIntrinsic - Lower a call of a target intrinsic to an INTRINSIC 3513/// node. 3514void SelectionDAGBuilder::visitTargetIntrinsic(const CallInst &I, 3515 unsigned Intrinsic) { 3516 bool HasChain = !I.doesNotAccessMemory(); 3517 bool OnlyLoad = HasChain && I.onlyReadsMemory(); 3518 3519 // Build the operand list. 3520 SmallVector<SDValue, 8> Ops; 3521 if (HasChain) { // If this intrinsic has side-effects, chainify it. 3522 if (OnlyLoad) { 3523 // We don't need to serialize loads against other loads. 3524 Ops.push_back(DAG.getRoot()); 3525 } else { 3526 Ops.push_back(getRoot()); 3527 } 3528 } 3529 3530 // Info is set by getTgtMemInstrinsic 3531 TargetLowering::IntrinsicInfo Info; 3532 bool IsTgtIntrinsic = TLI.getTgtMemIntrinsic(Info, I, Intrinsic); 3533 3534 // Add the intrinsic ID as an integer operand if it's not a target intrinsic. 3535 if (!IsTgtIntrinsic || Info.opc == ISD::INTRINSIC_VOID || 3536 Info.opc == ISD::INTRINSIC_W_CHAIN) 3537 Ops.push_back(DAG.getTargetConstant(Intrinsic, TLI.getPointerTy())); 3538 3539 // Add all operands of the call to the operand list. 3540 for (unsigned i = 0, e = I.getNumArgOperands(); i != e; ++i) { 3541 SDValue Op = getValue(I.getArgOperand(i)); 3542 Ops.push_back(Op); 3543 } 3544 3545 SmallVector<EVT, 4> ValueVTs; 3546 ComputeValueVTs(TLI, I.getType(), ValueVTs); 3547 3548 if (HasChain) 3549 ValueVTs.push_back(MVT::Other); 3550 3551 SDVTList VTs = DAG.getVTList(ValueVTs.data(), ValueVTs.size()); 3552 3553 // Create the node. 3554 SDValue Result; 3555 if (IsTgtIntrinsic) { 3556 // This is target intrinsic that touches memory 3557 Result = DAG.getMemIntrinsicNode(Info.opc, getCurDebugLoc(), 3558 VTs, &Ops[0], Ops.size(), 3559 Info.memVT, 3560 MachinePointerInfo(Info.ptrVal, Info.offset), 3561 Info.align, Info.vol, 3562 Info.readMem, Info.writeMem); 3563 } else if (!HasChain) { 3564 Result = DAG.getNode(ISD::INTRINSIC_WO_CHAIN, getCurDebugLoc(), 3565 VTs, &Ops[0], Ops.size()); 3566 } else if (!I.getType()->isVoidTy()) { 3567 Result = DAG.getNode(ISD::INTRINSIC_W_CHAIN, getCurDebugLoc(), 3568 VTs, &Ops[0], Ops.size()); 3569 } else { 3570 Result = DAG.getNode(ISD::INTRINSIC_VOID, getCurDebugLoc(), 3571 VTs, &Ops[0], Ops.size()); 3572 } 3573 3574 if (HasChain) { 3575 SDValue Chain = Result.getValue(Result.getNode()->getNumValues()-1); 3576 if (OnlyLoad) 3577 PendingLoads.push_back(Chain); 3578 else 3579 DAG.setRoot(Chain); 3580 } 3581 3582 if (!I.getType()->isVoidTy()) { 3583 if (VectorType *PTy = dyn_cast<VectorType>(I.getType())) { 3584 EVT VT = TLI.getValueType(PTy); 3585 Result = DAG.getNode(ISD::BITCAST, getCurDebugLoc(), VT, Result); 3586 } 3587 3588 setValue(&I, Result); 3589 } 3590} 3591 3592/// GetSignificand - Get the significand and build it into a floating-point 3593/// number with exponent of 1: 3594/// 3595/// Op = (Op & 0x007fffff) | 0x3f800000; 3596/// 3597/// where Op is the hexidecimal representation of floating point value. 3598static SDValue 3599GetSignificand(SelectionDAG &DAG, SDValue Op, DebugLoc dl) { 3600 SDValue t1 = DAG.getNode(ISD::AND, dl, MVT::i32, Op, 3601 DAG.getConstant(0x007fffff, MVT::i32)); 3602 SDValue t2 = DAG.getNode(ISD::OR, dl, MVT::i32, t1, 3603 DAG.getConstant(0x3f800000, MVT::i32)); 3604 return DAG.getNode(ISD::BITCAST, dl, MVT::f32, t2); 3605} 3606 3607/// GetExponent - Get the exponent: 3608/// 3609/// (float)(int)(((Op & 0x7f800000) >> 23) - 127); 3610/// 3611/// where Op is the hexidecimal representation of floating point value. 3612static SDValue 3613GetExponent(SelectionDAG &DAG, SDValue Op, const TargetLowering &TLI, 3614 DebugLoc dl) { 3615 SDValue t0 = DAG.getNode(ISD::AND, dl, MVT::i32, Op, 3616 DAG.getConstant(0x7f800000, MVT::i32)); 3617 SDValue t1 = DAG.getNode(ISD::SRL, dl, MVT::i32, t0, 3618 DAG.getConstant(23, TLI.getPointerTy())); 3619 SDValue t2 = DAG.getNode(ISD::SUB, dl, MVT::i32, t1, 3620 DAG.getConstant(127, MVT::i32)); 3621 return DAG.getNode(ISD::SINT_TO_FP, dl, MVT::f32, t2); 3622} 3623 3624/// getF32Constant - Get 32-bit floating point constant. 3625static SDValue 3626getF32Constant(SelectionDAG &DAG, unsigned Flt) { 3627 return DAG.getConstantFP(APFloat(APInt(32, Flt)), MVT::f32); 3628} 3629 3630// implVisitAluOverflow - Lower arithmetic overflow instrinsics. 3631const char * 3632SelectionDAGBuilder::implVisitAluOverflow(const CallInst &I, ISD::NodeType Op) { 3633 SDValue Op1 = getValue(I.getArgOperand(0)); 3634 SDValue Op2 = getValue(I.getArgOperand(1)); 3635 3636 SDVTList VTs = DAG.getVTList(Op1.getValueType(), MVT::i1); 3637 setValue(&I, DAG.getNode(Op, getCurDebugLoc(), VTs, Op1, Op2)); 3638 return 0; 3639} 3640 3641/// visitExp - Lower an exp intrinsic. Handles the special sequences for 3642/// limited-precision mode. 3643void 3644SelectionDAGBuilder::visitExp(const CallInst &I) { 3645 SDValue result; 3646 DebugLoc dl = getCurDebugLoc(); 3647 3648 if (getValue(I.getArgOperand(0)).getValueType() == MVT::f32 && 3649 LimitFloatPrecision > 0 && LimitFloatPrecision <= 18) { 3650 SDValue Op = getValue(I.getArgOperand(0)); 3651 3652 // Put the exponent in the right bit position for later addition to the 3653 // final result: 3654 // 3655 // #define LOG2OFe 1.4426950f 3656 // IntegerPartOfX = ((int32_t)(X * LOG2OFe)); 3657 SDValue t0 = DAG.getNode(ISD::FMUL, dl, MVT::f32, Op, 3658 getF32Constant(DAG, 0x3fb8aa3b)); 3659 SDValue IntegerPartOfX = DAG.getNode(ISD::FP_TO_SINT, dl, MVT::i32, t0); 3660 3661 // FractionalPartOfX = (X * LOG2OFe) - (float)IntegerPartOfX; 3662 SDValue t1 = DAG.getNode(ISD::SINT_TO_FP, dl, MVT::f32, IntegerPartOfX); 3663 SDValue X = DAG.getNode(ISD::FSUB, dl, MVT::f32, t0, t1); 3664 3665 // IntegerPartOfX <<= 23; 3666 IntegerPartOfX = DAG.getNode(ISD::SHL, dl, MVT::i32, IntegerPartOfX, 3667 DAG.getConstant(23, TLI.getPointerTy())); 3668 3669 if (LimitFloatPrecision <= 6) { 3670 // For floating-point precision of 6: 3671 // 3672 // TwoToFractionalPartOfX = 3673 // 0.997535578f + 3674 // (0.735607626f + 0.252464424f * x) * x; 3675 // 3676 // error 0.0144103317, which is 6 bits 3677 SDValue t2 = DAG.getNode(ISD::FMUL, dl, MVT::f32, X, 3678 getF32Constant(DAG, 0x3e814304)); 3679 SDValue t3 = DAG.getNode(ISD::FADD, dl, MVT::f32, t2, 3680 getF32Constant(DAG, 0x3f3c50c8)); 3681 SDValue t4 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t3, X); 3682 SDValue t5 = DAG.getNode(ISD::FADD, dl, MVT::f32, t4, 3683 getF32Constant(DAG, 0x3f7f5e7e)); 3684 SDValue TwoToFracPartOfX = DAG.getNode(ISD::BITCAST, dl,MVT::i32, t5); 3685 3686 // Add the exponent into the result in integer domain. 3687 SDValue t6 = DAG.getNode(ISD::ADD, dl, MVT::i32, 3688 TwoToFracPartOfX, IntegerPartOfX); 3689 3690 result = DAG.getNode(ISD::BITCAST, dl, MVT::f32, t6); 3691 } else if (LimitFloatPrecision > 6 && LimitFloatPrecision <= 12) { 3692 // For floating-point precision of 12: 3693 // 3694 // TwoToFractionalPartOfX = 3695 // 0.999892986f + 3696 // (0.696457318f + 3697 // (0.224338339f + 0.792043434e-1f * x) * x) * x; 3698 // 3699 // 0.000107046256 error, which is 13 to 14 bits 3700 SDValue t2 = DAG.getNode(ISD::FMUL, dl, MVT::f32, X, 3701 getF32Constant(DAG, 0x3da235e3)); 3702 SDValue t3 = DAG.getNode(ISD::FADD, dl, MVT::f32, t2, 3703 getF32Constant(DAG, 0x3e65b8f3)); 3704 SDValue t4 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t3, X); 3705 SDValue t5 = DAG.getNode(ISD::FADD, dl, MVT::f32, t4, 3706 getF32Constant(DAG, 0x3f324b07)); 3707 SDValue t6 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t5, X); 3708 SDValue t7 = DAG.getNode(ISD::FADD, dl, MVT::f32, t6, 3709 getF32Constant(DAG, 0x3f7ff8fd)); 3710 SDValue TwoToFracPartOfX = DAG.getNode(ISD::BITCAST, dl,MVT::i32, t7); 3711 3712 // Add the exponent into the result in integer domain. 3713 SDValue t8 = DAG.getNode(ISD::ADD, dl, MVT::i32, 3714 TwoToFracPartOfX, IntegerPartOfX); 3715 3716 result = DAG.getNode(ISD::BITCAST, dl, MVT::f32, t8); 3717 } else { // LimitFloatPrecision > 12 && LimitFloatPrecision <= 18 3718 // For floating-point precision of 18: 3719 // 3720 // TwoToFractionalPartOfX = 3721 // 0.999999982f + 3722 // (0.693148872f + 3723 // (0.240227044f + 3724 // (0.554906021e-1f + 3725 // (0.961591928e-2f + 3726 // (0.136028312e-2f + 0.157059148e-3f *x)*x)*x)*x)*x)*x; 3727 // 3728 // error 2.47208000*10^(-7), which is better than 18 bits 3729 SDValue t2 = DAG.getNode(ISD::FMUL, dl, MVT::f32, X, 3730 getF32Constant(DAG, 0x3924b03e)); 3731 SDValue t3 = DAG.getNode(ISD::FADD, dl, MVT::f32, t2, 3732 getF32Constant(DAG, 0x3ab24b87)); 3733 SDValue t4 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t3, X); 3734 SDValue t5 = DAG.getNode(ISD::FADD, dl, MVT::f32, t4, 3735 getF32Constant(DAG, 0x3c1d8c17)); 3736 SDValue t6 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t5, X); 3737 SDValue t7 = DAG.getNode(ISD::FADD, dl, MVT::f32, t6, 3738 getF32Constant(DAG, 0x3d634a1d)); 3739 SDValue t8 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t7, X); 3740 SDValue t9 = DAG.getNode(ISD::FADD, dl, MVT::f32, t8, 3741 getF32Constant(DAG, 0x3e75fe14)); 3742 SDValue t10 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t9, X); 3743 SDValue t11 = DAG.getNode(ISD::FADD, dl, MVT::f32, t10, 3744 getF32Constant(DAG, 0x3f317234)); 3745 SDValue t12 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t11, X); 3746 SDValue t13 = DAG.getNode(ISD::FADD, dl, MVT::f32, t12, 3747 getF32Constant(DAG, 0x3f800000)); 3748 SDValue TwoToFracPartOfX = DAG.getNode(ISD::BITCAST, dl, 3749 MVT::i32, t13); 3750 3751 // Add the exponent into the result in integer domain. 3752 SDValue t14 = DAG.getNode(ISD::ADD, dl, MVT::i32, 3753 TwoToFracPartOfX, IntegerPartOfX); 3754 3755 result = DAG.getNode(ISD::BITCAST, dl, MVT::f32, t14); 3756 } 3757 } else { 3758 // No special expansion. 3759 result = DAG.getNode(ISD::FEXP, dl, 3760 getValue(I.getArgOperand(0)).getValueType(), 3761 getValue(I.getArgOperand(0))); 3762 } 3763 3764 setValue(&I, result); 3765} 3766 3767/// visitLog - Lower a log intrinsic. Handles the special sequences for 3768/// limited-precision mode. 3769void 3770SelectionDAGBuilder::visitLog(const CallInst &I) { 3771 SDValue result; 3772 DebugLoc dl = getCurDebugLoc(); 3773 3774 if (getValue(I.getArgOperand(0)).getValueType() == MVT::f32 && 3775 LimitFloatPrecision > 0 && LimitFloatPrecision <= 18) { 3776 SDValue Op = getValue(I.getArgOperand(0)); 3777 SDValue Op1 = DAG.getNode(ISD::BITCAST, dl, MVT::i32, Op); 3778 3779 // Scale the exponent by log(2) [0.69314718f]. 3780 SDValue Exp = GetExponent(DAG, Op1, TLI, dl); 3781 SDValue LogOfExponent = DAG.getNode(ISD::FMUL, dl, MVT::f32, Exp, 3782 getF32Constant(DAG, 0x3f317218)); 3783 3784 // Get the significand and build it into a floating-point number with 3785 // exponent of 1. 3786 SDValue X = GetSignificand(DAG, Op1, dl); 3787 3788 if (LimitFloatPrecision <= 6) { 3789 // For floating-point precision of 6: 3790 // 3791 // LogofMantissa = 3792 // -1.1609546f + 3793 // (1.4034025f - 0.23903021f * x) * x; 3794 // 3795 // error 0.0034276066, which is better than 8 bits 3796 SDValue t0 = DAG.getNode(ISD::FMUL, dl, MVT::f32, X, 3797 getF32Constant(DAG, 0xbe74c456)); 3798 SDValue t1 = DAG.getNode(ISD::FADD, dl, MVT::f32, t0, 3799 getF32Constant(DAG, 0x3fb3a2b1)); 3800 SDValue t2 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t1, X); 3801 SDValue LogOfMantissa = DAG.getNode(ISD::FSUB, dl, MVT::f32, t2, 3802 getF32Constant(DAG, 0x3f949a29)); 3803 3804 result = DAG.getNode(ISD::FADD, dl, 3805 MVT::f32, LogOfExponent, LogOfMantissa); 3806 } else if (LimitFloatPrecision > 6 && LimitFloatPrecision <= 12) { 3807 // For floating-point precision of 12: 3808 // 3809 // LogOfMantissa = 3810 // -1.7417939f + 3811 // (2.8212026f + 3812 // (-1.4699568f + 3813 // (0.44717955f - 0.56570851e-1f * x) * x) * x) * x; 3814 // 3815 // error 0.000061011436, which is 14 bits 3816 SDValue t0 = DAG.getNode(ISD::FMUL, dl, MVT::f32, X, 3817 getF32Constant(DAG, 0xbd67b6d6)); 3818 SDValue t1 = DAG.getNode(ISD::FADD, dl, MVT::f32, t0, 3819 getF32Constant(DAG, 0x3ee4f4b8)); 3820 SDValue t2 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t1, X); 3821 SDValue t3 = DAG.getNode(ISD::FSUB, dl, MVT::f32, t2, 3822 getF32Constant(DAG, 0x3fbc278b)); 3823 SDValue t4 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t3, X); 3824 SDValue t5 = DAG.getNode(ISD::FADD, dl, MVT::f32, t4, 3825 getF32Constant(DAG, 0x40348e95)); 3826 SDValue t6 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t5, X); 3827 SDValue LogOfMantissa = DAG.getNode(ISD::FSUB, dl, MVT::f32, t6, 3828 getF32Constant(DAG, 0x3fdef31a)); 3829 3830 result = DAG.getNode(ISD::FADD, dl, 3831 MVT::f32, LogOfExponent, LogOfMantissa); 3832 } else { // LimitFloatPrecision > 12 && LimitFloatPrecision <= 18 3833 // For floating-point precision of 18: 3834 // 3835 // LogOfMantissa = 3836 // -2.1072184f + 3837 // (4.2372794f + 3838 // (-3.7029485f + 3839 // (2.2781945f + 3840 // (-0.87823314f + 3841 // (0.19073739f - 0.17809712e-1f * x) * x) * x) * x) * x)*x; 3842 // 3843 // error 0.0000023660568, which is better than 18 bits 3844 SDValue t0 = DAG.getNode(ISD::FMUL, dl, MVT::f32, X, 3845 getF32Constant(DAG, 0xbc91e5ac)); 3846 SDValue t1 = DAG.getNode(ISD::FADD, dl, MVT::f32, t0, 3847 getF32Constant(DAG, 0x3e4350aa)); 3848 SDValue t2 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t1, X); 3849 SDValue t3 = DAG.getNode(ISD::FSUB, dl, MVT::f32, t2, 3850 getF32Constant(DAG, 0x3f60d3e3)); 3851 SDValue t4 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t3, X); 3852 SDValue t5 = DAG.getNode(ISD::FADD, dl, MVT::f32, t4, 3853 getF32Constant(DAG, 0x4011cdf0)); 3854 SDValue t6 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t5, X); 3855 SDValue t7 = DAG.getNode(ISD::FSUB, dl, MVT::f32, t6, 3856 getF32Constant(DAG, 0x406cfd1c)); 3857 SDValue t8 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t7, X); 3858 SDValue t9 = DAG.getNode(ISD::FADD, dl, MVT::f32, t8, 3859 getF32Constant(DAG, 0x408797cb)); 3860 SDValue t10 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t9, X); 3861 SDValue LogOfMantissa = DAG.getNode(ISD::FSUB, dl, MVT::f32, t10, 3862 getF32Constant(DAG, 0x4006dcab)); 3863 3864 result = DAG.getNode(ISD::FADD, dl, 3865 MVT::f32, LogOfExponent, LogOfMantissa); 3866 } 3867 } else { 3868 // No special expansion. 3869 result = DAG.getNode(ISD::FLOG, dl, 3870 getValue(I.getArgOperand(0)).getValueType(), 3871 getValue(I.getArgOperand(0))); 3872 } 3873 3874 setValue(&I, result); 3875} 3876 3877/// visitLog2 - Lower a log2 intrinsic. Handles the special sequences for 3878/// limited-precision mode. 3879void 3880SelectionDAGBuilder::visitLog2(const CallInst &I) { 3881 SDValue result; 3882 DebugLoc dl = getCurDebugLoc(); 3883 3884 if (getValue(I.getArgOperand(0)).getValueType() == MVT::f32 && 3885 LimitFloatPrecision > 0 && LimitFloatPrecision <= 18) { 3886 SDValue Op = getValue(I.getArgOperand(0)); 3887 SDValue Op1 = DAG.getNode(ISD::BITCAST, dl, MVT::i32, Op); 3888 3889 // Get the exponent. 3890 SDValue LogOfExponent = GetExponent(DAG, Op1, TLI, dl); 3891 3892 // Get the significand and build it into a floating-point number with 3893 // exponent of 1. 3894 SDValue X = GetSignificand(DAG, Op1, dl); 3895 3896 // Different possible minimax approximations of significand in 3897 // floating-point for various degrees of accuracy over [1,2]. 3898 if (LimitFloatPrecision <= 6) { 3899 // For floating-point precision of 6: 3900 // 3901 // Log2ofMantissa = -1.6749035f + (2.0246817f - .34484768f * x) * x; 3902 // 3903 // error 0.0049451742, which is more than 7 bits 3904 SDValue t0 = DAG.getNode(ISD::FMUL, dl, MVT::f32, X, 3905 getF32Constant(DAG, 0xbeb08fe0)); 3906 SDValue t1 = DAG.getNode(ISD::FADD, dl, MVT::f32, t0, 3907 getF32Constant(DAG, 0x40019463)); 3908 SDValue t2 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t1, X); 3909 SDValue Log2ofMantissa = DAG.getNode(ISD::FSUB, dl, MVT::f32, t2, 3910 getF32Constant(DAG, 0x3fd6633d)); 3911 3912 result = DAG.getNode(ISD::FADD, dl, 3913 MVT::f32, LogOfExponent, Log2ofMantissa); 3914 } else if (LimitFloatPrecision > 6 && LimitFloatPrecision <= 12) { 3915 // For floating-point precision of 12: 3916 // 3917 // Log2ofMantissa = 3918 // -2.51285454f + 3919 // (4.07009056f + 3920 // (-2.12067489f + 3921 // (.645142248f - 0.816157886e-1f * x) * x) * x) * x; 3922 // 3923 // error 0.0000876136000, which is better than 13 bits 3924 SDValue t0 = DAG.getNode(ISD::FMUL, dl, MVT::f32, X, 3925 getF32Constant(DAG, 0xbda7262e)); 3926 SDValue t1 = DAG.getNode(ISD::FADD, dl, MVT::f32, t0, 3927 getF32Constant(DAG, 0x3f25280b)); 3928 SDValue t2 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t1, X); 3929 SDValue t3 = DAG.getNode(ISD::FSUB, dl, MVT::f32, t2, 3930 getF32Constant(DAG, 0x4007b923)); 3931 SDValue t4 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t3, X); 3932 SDValue t5 = DAG.getNode(ISD::FADD, dl, MVT::f32, t4, 3933 getF32Constant(DAG, 0x40823e2f)); 3934 SDValue t6 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t5, X); 3935 SDValue Log2ofMantissa = DAG.getNode(ISD::FSUB, dl, MVT::f32, t6, 3936 getF32Constant(DAG, 0x4020d29c)); 3937 3938 result = DAG.getNode(ISD::FADD, dl, 3939 MVT::f32, LogOfExponent, Log2ofMantissa); 3940 } else { // LimitFloatPrecision > 12 && LimitFloatPrecision <= 18 3941 // For floating-point precision of 18: 3942 // 3943 // Log2ofMantissa = 3944 // -3.0400495f + 3945 // (6.1129976f + 3946 // (-5.3420409f + 3947 // (3.2865683f + 3948 // (-1.2669343f + 3949 // (0.27515199f - 3950 // 0.25691327e-1f * x) * x) * x) * x) * x) * x; 3951 // 3952 // error 0.0000018516, which is better than 18 bits 3953 SDValue t0 = DAG.getNode(ISD::FMUL, dl, MVT::f32, X, 3954 getF32Constant(DAG, 0xbcd2769e)); 3955 SDValue t1 = DAG.getNode(ISD::FADD, dl, MVT::f32, t0, 3956 getF32Constant(DAG, 0x3e8ce0b9)); 3957 SDValue t2 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t1, X); 3958 SDValue t3 = DAG.getNode(ISD::FSUB, dl, MVT::f32, t2, 3959 getF32Constant(DAG, 0x3fa22ae7)); 3960 SDValue t4 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t3, X); 3961 SDValue t5 = DAG.getNode(ISD::FADD, dl, MVT::f32, t4, 3962 getF32Constant(DAG, 0x40525723)); 3963 SDValue t6 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t5, X); 3964 SDValue t7 = DAG.getNode(ISD::FSUB, dl, MVT::f32, t6, 3965 getF32Constant(DAG, 0x40aaf200)); 3966 SDValue t8 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t7, X); 3967 SDValue t9 = DAG.getNode(ISD::FADD, dl, MVT::f32, t8, 3968 getF32Constant(DAG, 0x40c39dad)); 3969 SDValue t10 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t9, X); 3970 SDValue Log2ofMantissa = DAG.getNode(ISD::FSUB, dl, MVT::f32, t10, 3971 getF32Constant(DAG, 0x4042902c)); 3972 3973 result = DAG.getNode(ISD::FADD, dl, 3974 MVT::f32, LogOfExponent, Log2ofMantissa); 3975 } 3976 } else { 3977 // No special expansion. 3978 result = DAG.getNode(ISD::FLOG2, dl, 3979 getValue(I.getArgOperand(0)).getValueType(), 3980 getValue(I.getArgOperand(0))); 3981 } 3982 3983 setValue(&I, result); 3984} 3985 3986/// visitLog10 - Lower a log10 intrinsic. Handles the special sequences for 3987/// limited-precision mode. 3988void 3989SelectionDAGBuilder::visitLog10(const CallInst &I) { 3990 SDValue result; 3991 DebugLoc dl = getCurDebugLoc(); 3992 3993 if (getValue(I.getArgOperand(0)).getValueType() == MVT::f32 && 3994 LimitFloatPrecision > 0 && LimitFloatPrecision <= 18) { 3995 SDValue Op = getValue(I.getArgOperand(0)); 3996 SDValue Op1 = DAG.getNode(ISD::BITCAST, dl, MVT::i32, Op); 3997 3998 // Scale the exponent by log10(2) [0.30102999f]. 3999 SDValue Exp = GetExponent(DAG, Op1, TLI, dl); 4000 SDValue LogOfExponent = DAG.getNode(ISD::FMUL, dl, MVT::f32, Exp, 4001 getF32Constant(DAG, 0x3e9a209a)); 4002 4003 // Get the significand and build it into a floating-point number with 4004 // exponent of 1. 4005 SDValue X = GetSignificand(DAG, Op1, dl); 4006 4007 if (LimitFloatPrecision <= 6) { 4008 // For floating-point precision of 6: 4009 // 4010 // Log10ofMantissa = 4011 // -0.50419619f + 4012 // (0.60948995f - 0.10380950f * x) * x; 4013 // 4014 // error 0.0014886165, which is 6 bits 4015 SDValue t0 = DAG.getNode(ISD::FMUL, dl, MVT::f32, X, 4016 getF32Constant(DAG, 0xbdd49a13)); 4017 SDValue t1 = DAG.getNode(ISD::FADD, dl, MVT::f32, t0, 4018 getF32Constant(DAG, 0x3f1c0789)); 4019 SDValue t2 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t1, X); 4020 SDValue Log10ofMantissa = DAG.getNode(ISD::FSUB, dl, MVT::f32, t2, 4021 getF32Constant(DAG, 0x3f011300)); 4022 4023 result = DAG.getNode(ISD::FADD, dl, 4024 MVT::f32, LogOfExponent, Log10ofMantissa); 4025 } else if (LimitFloatPrecision > 6 && LimitFloatPrecision <= 12) { 4026 // For floating-point precision of 12: 4027 // 4028 // Log10ofMantissa = 4029 // -0.64831180f + 4030 // (0.91751397f + 4031 // (-0.31664806f + 0.47637168e-1f * x) * x) * x; 4032 // 4033 // error 0.00019228036, which is better than 12 bits 4034 SDValue t0 = DAG.getNode(ISD::FMUL, dl, MVT::f32, X, 4035 getF32Constant(DAG, 0x3d431f31)); 4036 SDValue t1 = DAG.getNode(ISD::FSUB, dl, MVT::f32, t0, 4037 getF32Constant(DAG, 0x3ea21fb2)); 4038 SDValue t2 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t1, X); 4039 SDValue t3 = DAG.getNode(ISD::FADD, dl, MVT::f32, t2, 4040 getF32Constant(DAG, 0x3f6ae232)); 4041 SDValue t4 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t3, X); 4042 SDValue Log10ofMantissa = DAG.getNode(ISD::FSUB, dl, MVT::f32, t4, 4043 getF32Constant(DAG, 0x3f25f7c3)); 4044 4045 result = DAG.getNode(ISD::FADD, dl, 4046 MVT::f32, LogOfExponent, Log10ofMantissa); 4047 } else { // LimitFloatPrecision > 12 && LimitFloatPrecision <= 18 4048 // For floating-point precision of 18: 4049 // 4050 // Log10ofMantissa = 4051 // -0.84299375f + 4052 // (1.5327582f + 4053 // (-1.0688956f + 4054 // (0.49102474f + 4055 // (-0.12539807f + 0.13508273e-1f * x) * x) * x) * x) * x; 4056 // 4057 // error 0.0000037995730, which is better than 18 bits 4058 SDValue t0 = DAG.getNode(ISD::FMUL, dl, MVT::f32, X, 4059 getF32Constant(DAG, 0x3c5d51ce)); 4060 SDValue t1 = DAG.getNode(ISD::FSUB, dl, MVT::f32, t0, 4061 getF32Constant(DAG, 0x3e00685a)); 4062 SDValue t2 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t1, X); 4063 SDValue t3 = DAG.getNode(ISD::FADD, dl, MVT::f32, t2, 4064 getF32Constant(DAG, 0x3efb6798)); 4065 SDValue t4 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t3, X); 4066 SDValue t5 = DAG.getNode(ISD::FSUB, dl, MVT::f32, t4, 4067 getF32Constant(DAG, 0x3f88d192)); 4068 SDValue t6 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t5, X); 4069 SDValue t7 = DAG.getNode(ISD::FADD, dl, MVT::f32, t6, 4070 getF32Constant(DAG, 0x3fc4316c)); 4071 SDValue t8 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t7, X); 4072 SDValue Log10ofMantissa = DAG.getNode(ISD::FSUB, dl, MVT::f32, t8, 4073 getF32Constant(DAG, 0x3f57ce70)); 4074 4075 result = DAG.getNode(ISD::FADD, dl, 4076 MVT::f32, LogOfExponent, Log10ofMantissa); 4077 } 4078 } else { 4079 // No special expansion. 4080 result = DAG.getNode(ISD::FLOG10, dl, 4081 getValue(I.getArgOperand(0)).getValueType(), 4082 getValue(I.getArgOperand(0))); 4083 } 4084 4085 setValue(&I, result); 4086} 4087 4088/// visitExp2 - Lower an exp2 intrinsic. Handles the special sequences for 4089/// limited-precision mode. 4090void 4091SelectionDAGBuilder::visitExp2(const CallInst &I) { 4092 SDValue result; 4093 DebugLoc dl = getCurDebugLoc(); 4094 4095 if (getValue(I.getArgOperand(0)).getValueType() == MVT::f32 && 4096 LimitFloatPrecision > 0 && LimitFloatPrecision <= 18) { 4097 SDValue Op = getValue(I.getArgOperand(0)); 4098 4099 SDValue IntegerPartOfX = DAG.getNode(ISD::FP_TO_SINT, dl, MVT::i32, Op); 4100 4101 // FractionalPartOfX = x - (float)IntegerPartOfX; 4102 SDValue t1 = DAG.getNode(ISD::SINT_TO_FP, dl, MVT::f32, IntegerPartOfX); 4103 SDValue X = DAG.getNode(ISD::FSUB, dl, MVT::f32, Op, t1); 4104 4105 // IntegerPartOfX <<= 23; 4106 IntegerPartOfX = DAG.getNode(ISD::SHL, dl, MVT::i32, IntegerPartOfX, 4107 DAG.getConstant(23, TLI.getPointerTy())); 4108 4109 if (LimitFloatPrecision <= 6) { 4110 // For floating-point precision of 6: 4111 // 4112 // TwoToFractionalPartOfX = 4113 // 0.997535578f + 4114 // (0.735607626f + 0.252464424f * x) * x; 4115 // 4116 // error 0.0144103317, which is 6 bits 4117 SDValue t2 = DAG.getNode(ISD::FMUL, dl, MVT::f32, X, 4118 getF32Constant(DAG, 0x3e814304)); 4119 SDValue t3 = DAG.getNode(ISD::FADD, dl, MVT::f32, t2, 4120 getF32Constant(DAG, 0x3f3c50c8)); 4121 SDValue t4 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t3, X); 4122 SDValue t5 = DAG.getNode(ISD::FADD, dl, MVT::f32, t4, 4123 getF32Constant(DAG, 0x3f7f5e7e)); 4124 SDValue t6 = DAG.getNode(ISD::BITCAST, dl, MVT::i32, t5); 4125 SDValue TwoToFractionalPartOfX = 4126 DAG.getNode(ISD::ADD, dl, MVT::i32, t6, IntegerPartOfX); 4127 4128 result = DAG.getNode(ISD::BITCAST, dl, 4129 MVT::f32, TwoToFractionalPartOfX); 4130 } else if (LimitFloatPrecision > 6 && LimitFloatPrecision <= 12) { 4131 // For floating-point precision of 12: 4132 // 4133 // TwoToFractionalPartOfX = 4134 // 0.999892986f + 4135 // (0.696457318f + 4136 // (0.224338339f + 0.792043434e-1f * x) * x) * x; 4137 // 4138 // error 0.000107046256, which is 13 to 14 bits 4139 SDValue t2 = DAG.getNode(ISD::FMUL, dl, MVT::f32, X, 4140 getF32Constant(DAG, 0x3da235e3)); 4141 SDValue t3 = DAG.getNode(ISD::FADD, dl, MVT::f32, t2, 4142 getF32Constant(DAG, 0x3e65b8f3)); 4143 SDValue t4 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t3, X); 4144 SDValue t5 = DAG.getNode(ISD::FADD, dl, MVT::f32, t4, 4145 getF32Constant(DAG, 0x3f324b07)); 4146 SDValue t6 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t5, X); 4147 SDValue t7 = DAG.getNode(ISD::FADD, dl, MVT::f32, t6, 4148 getF32Constant(DAG, 0x3f7ff8fd)); 4149 SDValue t8 = DAG.getNode(ISD::BITCAST, dl, MVT::i32, t7); 4150 SDValue TwoToFractionalPartOfX = 4151 DAG.getNode(ISD::ADD, dl, MVT::i32, t8, IntegerPartOfX); 4152 4153 result = DAG.getNode(ISD::BITCAST, dl, 4154 MVT::f32, TwoToFractionalPartOfX); 4155 } else { // LimitFloatPrecision > 12 && LimitFloatPrecision <= 18 4156 // For floating-point precision of 18: 4157 // 4158 // TwoToFractionalPartOfX = 4159 // 0.999999982f + 4160 // (0.693148872f + 4161 // (0.240227044f + 4162 // (0.554906021e-1f + 4163 // (0.961591928e-2f + 4164 // (0.136028312e-2f + 0.157059148e-3f *x)*x)*x)*x)*x)*x; 4165 // error 2.47208000*10^(-7), which is better than 18 bits 4166 SDValue t2 = DAG.getNode(ISD::FMUL, dl, MVT::f32, X, 4167 getF32Constant(DAG, 0x3924b03e)); 4168 SDValue t3 = DAG.getNode(ISD::FADD, dl, MVT::f32, t2, 4169 getF32Constant(DAG, 0x3ab24b87)); 4170 SDValue t4 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t3, X); 4171 SDValue t5 = DAG.getNode(ISD::FADD, dl, MVT::f32, t4, 4172 getF32Constant(DAG, 0x3c1d8c17)); 4173 SDValue t6 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t5, X); 4174 SDValue t7 = DAG.getNode(ISD::FADD, dl, MVT::f32, t6, 4175 getF32Constant(DAG, 0x3d634a1d)); 4176 SDValue t8 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t7, X); 4177 SDValue t9 = DAG.getNode(ISD::FADD, dl, MVT::f32, t8, 4178 getF32Constant(DAG, 0x3e75fe14)); 4179 SDValue t10 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t9, X); 4180 SDValue t11 = DAG.getNode(ISD::FADD, dl, MVT::f32, t10, 4181 getF32Constant(DAG, 0x3f317234)); 4182 SDValue t12 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t11, X); 4183 SDValue t13 = DAG.getNode(ISD::FADD, dl, MVT::f32, t12, 4184 getF32Constant(DAG, 0x3f800000)); 4185 SDValue t14 = DAG.getNode(ISD::BITCAST, dl, MVT::i32, t13); 4186 SDValue TwoToFractionalPartOfX = 4187 DAG.getNode(ISD::ADD, dl, MVT::i32, t14, IntegerPartOfX); 4188 4189 result = DAG.getNode(ISD::BITCAST, dl, 4190 MVT::f32, TwoToFractionalPartOfX); 4191 } 4192 } else { 4193 // No special expansion. 4194 result = DAG.getNode(ISD::FEXP2, dl, 4195 getValue(I.getArgOperand(0)).getValueType(), 4196 getValue(I.getArgOperand(0))); 4197 } 4198 4199 setValue(&I, result); 4200} 4201 4202/// visitPow - Lower a pow intrinsic. Handles the special sequences for 4203/// limited-precision mode with x == 10.0f. 4204void 4205SelectionDAGBuilder::visitPow(const CallInst &I) { 4206 SDValue result; 4207 const Value *Val = I.getArgOperand(0); 4208 DebugLoc dl = getCurDebugLoc(); 4209 bool IsExp10 = false; 4210 4211 if (getValue(Val).getValueType() == MVT::f32 && 4212 getValue(I.getArgOperand(1)).getValueType() == MVT::f32 && 4213 LimitFloatPrecision > 0 && LimitFloatPrecision <= 18) { 4214 if (Constant *C = const_cast<Constant*>(dyn_cast<Constant>(Val))) { 4215 if (ConstantFP *CFP = dyn_cast<ConstantFP>(C)) { 4216 APFloat Ten(10.0f); 4217 IsExp10 = CFP->getValueAPF().bitwiseIsEqual(Ten); 4218 } 4219 } 4220 } 4221 4222 if (IsExp10 && LimitFloatPrecision > 0 && LimitFloatPrecision <= 18) { 4223 SDValue Op = getValue(I.getArgOperand(1)); 4224 4225 // Put the exponent in the right bit position for later addition to the 4226 // final result: 4227 // 4228 // #define LOG2OF10 3.3219281f 4229 // IntegerPartOfX = (int32_t)(x * LOG2OF10); 4230 SDValue t0 = DAG.getNode(ISD::FMUL, dl, MVT::f32, Op, 4231 getF32Constant(DAG, 0x40549a78)); 4232 SDValue IntegerPartOfX = DAG.getNode(ISD::FP_TO_SINT, dl, MVT::i32, t0); 4233 4234 // FractionalPartOfX = x - (float)IntegerPartOfX; 4235 SDValue t1 = DAG.getNode(ISD::SINT_TO_FP, dl, MVT::f32, IntegerPartOfX); 4236 SDValue X = DAG.getNode(ISD::FSUB, dl, MVT::f32, t0, t1); 4237 4238 // IntegerPartOfX <<= 23; 4239 IntegerPartOfX = DAG.getNode(ISD::SHL, dl, MVT::i32, IntegerPartOfX, 4240 DAG.getConstant(23, TLI.getPointerTy())); 4241 4242 if (LimitFloatPrecision <= 6) { 4243 // For floating-point precision of 6: 4244 // 4245 // twoToFractionalPartOfX = 4246 // 0.997535578f + 4247 // (0.735607626f + 0.252464424f * x) * x; 4248 // 4249 // error 0.0144103317, which is 6 bits 4250 SDValue t2 = DAG.getNode(ISD::FMUL, dl, MVT::f32, X, 4251 getF32Constant(DAG, 0x3e814304)); 4252 SDValue t3 = DAG.getNode(ISD::FADD, dl, MVT::f32, t2, 4253 getF32Constant(DAG, 0x3f3c50c8)); 4254 SDValue t4 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t3, X); 4255 SDValue t5 = DAG.getNode(ISD::FADD, dl, MVT::f32, t4, 4256 getF32Constant(DAG, 0x3f7f5e7e)); 4257 SDValue t6 = DAG.getNode(ISD::BITCAST, dl, MVT::i32, t5); 4258 SDValue TwoToFractionalPartOfX = 4259 DAG.getNode(ISD::ADD, dl, MVT::i32, t6, IntegerPartOfX); 4260 4261 result = DAG.getNode(ISD::BITCAST, dl, 4262 MVT::f32, TwoToFractionalPartOfX); 4263 } else if (LimitFloatPrecision > 6 && LimitFloatPrecision <= 12) { 4264 // For floating-point precision of 12: 4265 // 4266 // TwoToFractionalPartOfX = 4267 // 0.999892986f + 4268 // (0.696457318f + 4269 // (0.224338339f + 0.792043434e-1f * x) * x) * x; 4270 // 4271 // error 0.000107046256, which is 13 to 14 bits 4272 SDValue t2 = DAG.getNode(ISD::FMUL, dl, MVT::f32, X, 4273 getF32Constant(DAG, 0x3da235e3)); 4274 SDValue t3 = DAG.getNode(ISD::FADD, dl, MVT::f32, t2, 4275 getF32Constant(DAG, 0x3e65b8f3)); 4276 SDValue t4 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t3, X); 4277 SDValue t5 = DAG.getNode(ISD::FADD, dl, MVT::f32, t4, 4278 getF32Constant(DAG, 0x3f324b07)); 4279 SDValue t6 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t5, X); 4280 SDValue t7 = DAG.getNode(ISD::FADD, dl, MVT::f32, t6, 4281 getF32Constant(DAG, 0x3f7ff8fd)); 4282 SDValue t8 = DAG.getNode(ISD::BITCAST, dl, MVT::i32, t7); 4283 SDValue TwoToFractionalPartOfX = 4284 DAG.getNode(ISD::ADD, dl, MVT::i32, t8, IntegerPartOfX); 4285 4286 result = DAG.getNode(ISD::BITCAST, dl, 4287 MVT::f32, TwoToFractionalPartOfX); 4288 } else { // LimitFloatPrecision > 12 && LimitFloatPrecision <= 18 4289 // For floating-point precision of 18: 4290 // 4291 // TwoToFractionalPartOfX = 4292 // 0.999999982f + 4293 // (0.693148872f + 4294 // (0.240227044f + 4295 // (0.554906021e-1f + 4296 // (0.961591928e-2f + 4297 // (0.136028312e-2f + 0.157059148e-3f *x)*x)*x)*x)*x)*x; 4298 // error 2.47208000*10^(-7), which is better than 18 bits 4299 SDValue t2 = DAG.getNode(ISD::FMUL, dl, MVT::f32, X, 4300 getF32Constant(DAG, 0x3924b03e)); 4301 SDValue t3 = DAG.getNode(ISD::FADD, dl, MVT::f32, t2, 4302 getF32Constant(DAG, 0x3ab24b87)); 4303 SDValue t4 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t3, X); 4304 SDValue t5 = DAG.getNode(ISD::FADD, dl, MVT::f32, t4, 4305 getF32Constant(DAG, 0x3c1d8c17)); 4306 SDValue t6 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t5, X); 4307 SDValue t7 = DAG.getNode(ISD::FADD, dl, MVT::f32, t6, 4308 getF32Constant(DAG, 0x3d634a1d)); 4309 SDValue t8 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t7, X); 4310 SDValue t9 = DAG.getNode(ISD::FADD, dl, MVT::f32, t8, 4311 getF32Constant(DAG, 0x3e75fe14)); 4312 SDValue t10 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t9, X); 4313 SDValue t11 = DAG.getNode(ISD::FADD, dl, MVT::f32, t10, 4314 getF32Constant(DAG, 0x3f317234)); 4315 SDValue t12 = DAG.getNode(ISD::FMUL, dl, MVT::f32, t11, X); 4316 SDValue t13 = DAG.getNode(ISD::FADD, dl, MVT::f32, t12, 4317 getF32Constant(DAG, 0x3f800000)); 4318 SDValue t14 = DAG.getNode(ISD::BITCAST, dl, MVT::i32, t13); 4319 SDValue TwoToFractionalPartOfX = 4320 DAG.getNode(ISD::ADD, dl, MVT::i32, t14, IntegerPartOfX); 4321 4322 result = DAG.getNode(ISD::BITCAST, dl, 4323 MVT::f32, TwoToFractionalPartOfX); 4324 } 4325 } else { 4326 // No special expansion. 4327 result = DAG.getNode(ISD::FPOW, dl, 4328 getValue(I.getArgOperand(0)).getValueType(), 4329 getValue(I.getArgOperand(0)), 4330 getValue(I.getArgOperand(1))); 4331 } 4332 4333 setValue(&I, result); 4334} 4335 4336 4337/// ExpandPowI - Expand a llvm.powi intrinsic. 4338static SDValue ExpandPowI(DebugLoc DL, SDValue LHS, SDValue RHS, 4339 SelectionDAG &DAG) { 4340 // If RHS is a constant, we can expand this out to a multiplication tree, 4341 // otherwise we end up lowering to a call to __powidf2 (for example). When 4342 // optimizing for size, we only want to do this if the expansion would produce 4343 // a small number of multiplies, otherwise we do the full expansion. 4344 if (ConstantSDNode *RHSC = dyn_cast<ConstantSDNode>(RHS)) { 4345 // Get the exponent as a positive value. 4346 unsigned Val = RHSC->getSExtValue(); 4347 if ((int)Val < 0) Val = -Val; 4348 4349 // powi(x, 0) -> 1.0 4350 if (Val == 0) 4351 return DAG.getConstantFP(1.0, LHS.getValueType()); 4352 4353 const Function *F = DAG.getMachineFunction().getFunction(); 4354 if (!F->hasFnAttr(Attribute::OptimizeForSize) || 4355 // If optimizing for size, don't insert too many multiplies. This 4356 // inserts up to 5 multiplies. 4357 CountPopulation_32(Val)+Log2_32(Val) < 7) { 4358 // We use the simple binary decomposition method to generate the multiply 4359 // sequence. There are more optimal ways to do this (for example, 4360 // powi(x,15) generates one more multiply than it should), but this has 4361 // the benefit of being both really simple and much better than a libcall. 4362 SDValue Res; // Logically starts equal to 1.0 4363 SDValue CurSquare = LHS; 4364 while (Val) { 4365 if (Val & 1) { 4366 if (Res.getNode()) 4367 Res = DAG.getNode(ISD::FMUL, DL,Res.getValueType(), Res, CurSquare); 4368 else 4369 Res = CurSquare; // 1.0*CurSquare. 4370 } 4371 4372 CurSquare = DAG.getNode(ISD::FMUL, DL, CurSquare.getValueType(), 4373 CurSquare, CurSquare); 4374 Val >>= 1; 4375 } 4376 4377 // If the original was negative, invert the result, producing 1/(x*x*x). 4378 if (RHSC->getSExtValue() < 0) 4379 Res = DAG.getNode(ISD::FDIV, DL, LHS.getValueType(), 4380 DAG.getConstantFP(1.0, LHS.getValueType()), Res); 4381 return Res; 4382 } 4383 } 4384 4385 // Otherwise, expand to a libcall. 4386 return DAG.getNode(ISD::FPOWI, DL, LHS.getValueType(), LHS, RHS); 4387} 4388 4389// getTruncatedArgReg - Find underlying register used for an truncated 4390// argument. 4391static unsigned getTruncatedArgReg(const SDValue &N) { 4392 if (N.getOpcode() != ISD::TRUNCATE) 4393 return 0; 4394 4395 const SDValue &Ext = N.getOperand(0); 4396 if (Ext.getOpcode() == ISD::AssertZext || Ext.getOpcode() == ISD::AssertSext){ 4397 const SDValue &CFR = Ext.getOperand(0); 4398 if (CFR.getOpcode() == ISD::CopyFromReg) 4399 return cast<RegisterSDNode>(CFR.getOperand(1))->getReg(); 4400 else 4401 if (CFR.getOpcode() == ISD::TRUNCATE) 4402 return getTruncatedArgReg(CFR); 4403 } 4404 return 0; 4405} 4406 4407/// EmitFuncArgumentDbgValue - If the DbgValueInst is a dbg_value of a function 4408/// argument, create the corresponding DBG_VALUE machine instruction for it now. 4409/// At the end of instruction selection, they will be inserted to the entry BB. 4410bool 4411SelectionDAGBuilder::EmitFuncArgumentDbgValue(const Value *V, MDNode *Variable, 4412 int64_t Offset, 4413 const SDValue &N) { 4414 const Argument *Arg = dyn_cast<Argument>(V); 4415 if (!Arg) 4416 return false; 4417 4418 MachineFunction &MF = DAG.getMachineFunction(); 4419 const TargetInstrInfo *TII = DAG.getTarget().getInstrInfo(); 4420 const TargetRegisterInfo *TRI = DAG.getTarget().getRegisterInfo(); 4421 4422 // Ignore inlined function arguments here. 4423 DIVariable DV(Variable); 4424 if (DV.isInlinedFnArgument(MF.getFunction())) 4425 return false; 4426 4427 unsigned Reg = 0; 4428 // Some arguments' frame index is recorded during argument lowering. 4429 Offset = FuncInfo.getArgumentFrameIndex(Arg); 4430 if (Offset) 4431 Reg = TRI->getFrameRegister(MF); 4432 4433 if (!Reg && N.getNode()) { 4434 if (N.getOpcode() == ISD::CopyFromReg) 4435 Reg = cast<RegisterSDNode>(N.getOperand(1))->getReg(); 4436 else 4437 Reg = getTruncatedArgReg(N); 4438 if (Reg && TargetRegisterInfo::isVirtualRegister(Reg)) { 4439 MachineRegisterInfo &RegInfo = MF.getRegInfo(); 4440 unsigned PR = RegInfo.getLiveInPhysReg(Reg); 4441 if (PR) 4442 Reg = PR; 4443 } 4444 } 4445 4446 if (!Reg) { 4447 // Check if ValueMap has reg number. 4448 DenseMap<const Value *, unsigned>::iterator VMI = FuncInfo.ValueMap.find(V); 4449 if (VMI != FuncInfo.ValueMap.end()) 4450 Reg = VMI->second; 4451 } 4452 4453 if (!Reg && N.getNode()) { 4454 // Check if frame index is available. 4455 if (LoadSDNode *LNode = dyn_cast<LoadSDNode>(N.getNode())) 4456 if (FrameIndexSDNode *FINode = 4457 dyn_cast<FrameIndexSDNode>(LNode->getBasePtr().getNode())) { 4458 Reg = TRI->getFrameRegister(MF); 4459 Offset = FINode->getIndex(); 4460 } 4461 } 4462 4463 if (!Reg) 4464 return false; 4465 4466 MachineInstrBuilder MIB = BuildMI(MF, getCurDebugLoc(), 4467 TII->get(TargetOpcode::DBG_VALUE)) 4468 .addReg(Reg, RegState::Debug).addImm(Offset).addMetadata(Variable); 4469 FuncInfo.ArgDbgValues.push_back(&*MIB); 4470 return true; 4471} 4472 4473// VisualStudio defines setjmp as _setjmp 4474#if defined(_MSC_VER) && defined(setjmp) && \ 4475 !defined(setjmp_undefined_for_msvc) 4476# pragma push_macro("setjmp") 4477# undef setjmp 4478# define setjmp_undefined_for_msvc 4479#endif 4480 4481/// visitIntrinsicCall - Lower the call to the specified intrinsic function. If 4482/// we want to emit this as a call to a named external function, return the name 4483/// otherwise lower it and return null. 4484const char * 4485SelectionDAGBuilder::visitIntrinsicCall(const CallInst &I, unsigned Intrinsic) { 4486 DebugLoc dl = getCurDebugLoc(); 4487 SDValue Res; 4488 4489 switch (Intrinsic) { 4490 default: 4491 // By default, turn this into a target intrinsic node. 4492 visitTargetIntrinsic(I, Intrinsic); 4493 return 0; 4494 case Intrinsic::vastart: visitVAStart(I); return 0; 4495 case Intrinsic::vaend: visitVAEnd(I); return 0; 4496 case Intrinsic::vacopy: visitVACopy(I); return 0; 4497 case Intrinsic::returnaddress: 4498 setValue(&I, DAG.getNode(ISD::RETURNADDR, dl, TLI.getPointerTy(), 4499 getValue(I.getArgOperand(0)))); 4500 return 0; 4501 case Intrinsic::frameaddress: 4502 setValue(&I, DAG.getNode(ISD::FRAMEADDR, dl, TLI.getPointerTy(), 4503 getValue(I.getArgOperand(0)))); 4504 return 0; 4505 case Intrinsic::setjmp: 4506 return "_setjmp"+!TLI.usesUnderscoreSetJmp(); 4507 case Intrinsic::longjmp: 4508 return "_longjmp"+!TLI.usesUnderscoreLongJmp(); 4509 case Intrinsic::memcpy: { 4510 // Assert for address < 256 since we support only user defined address 4511 // spaces. 4512 assert(cast<PointerType>(I.getArgOperand(0)->getType())->getAddressSpace() 4513 < 256 && 4514 cast<PointerType>(I.getArgOperand(1)->getType())->getAddressSpace() 4515 < 256 && 4516 "Unknown address space"); 4517 SDValue Op1 = getValue(I.getArgOperand(0)); 4518 SDValue Op2 = getValue(I.getArgOperand(1)); 4519 SDValue Op3 = getValue(I.getArgOperand(2)); 4520 unsigned Align = cast<ConstantInt>(I.getArgOperand(3))->getZExtValue(); 4521 bool isVol = cast<ConstantInt>(I.getArgOperand(4))->getZExtValue(); 4522 DAG.setRoot(DAG.getMemcpy(getRoot(), dl, Op1, Op2, Op3, Align, isVol, false, 4523 MachinePointerInfo(I.getArgOperand(0)), 4524 MachinePointerInfo(I.getArgOperand(1)))); 4525 return 0; 4526 } 4527 case Intrinsic::memset: { 4528 // Assert for address < 256 since we support only user defined address 4529 // spaces. 4530 assert(cast<PointerType>(I.getArgOperand(0)->getType())->getAddressSpace() 4531 < 256 && 4532 "Unknown address space"); 4533 SDValue Op1 = getValue(I.getArgOperand(0)); 4534 SDValue Op2 = getValue(I.getArgOperand(1)); 4535 SDValue Op3 = getValue(I.getArgOperand(2)); 4536 unsigned Align = cast<ConstantInt>(I.getArgOperand(3))->getZExtValue(); 4537 bool isVol = cast<ConstantInt>(I.getArgOperand(4))->getZExtValue(); 4538 DAG.setRoot(DAG.getMemset(getRoot(), dl, Op1, Op2, Op3, Align, isVol, 4539 MachinePointerInfo(I.getArgOperand(0)))); 4540 return 0; 4541 } 4542 case Intrinsic::memmove: { 4543 // Assert for address < 256 since we support only user defined address 4544 // spaces. 4545 assert(cast<PointerType>(I.getArgOperand(0)->getType())->getAddressSpace() 4546 < 256 && 4547 cast<PointerType>(I.getArgOperand(1)->getType())->getAddressSpace() 4548 < 256 && 4549 "Unknown address space"); 4550 SDValue Op1 = getValue(I.getArgOperand(0)); 4551 SDValue Op2 = getValue(I.getArgOperand(1)); 4552 SDValue Op3 = getValue(I.getArgOperand(2)); 4553 unsigned Align = cast<ConstantInt>(I.getArgOperand(3))->getZExtValue(); 4554 bool isVol = cast<ConstantInt>(I.getArgOperand(4))->getZExtValue(); 4555 DAG.setRoot(DAG.getMemmove(getRoot(), dl, Op1, Op2, Op3, Align, isVol, 4556 MachinePointerInfo(I.getArgOperand(0)), 4557 MachinePointerInfo(I.getArgOperand(1)))); 4558 return 0; 4559 } 4560 case Intrinsic::dbg_declare: { 4561 const DbgDeclareInst &DI = cast<DbgDeclareInst>(I); 4562 MDNode *Variable = DI.getVariable(); 4563 const Value *Address = DI.getAddress(); 4564 if (!Address || !DIVariable(Variable).Verify()) 4565 return 0; 4566 4567 // Build an entry in DbgOrdering. Debug info input nodes get an SDNodeOrder 4568 // but do not always have a corresponding SDNode built. The SDNodeOrder 4569 // absolute, but not relative, values are different depending on whether 4570 // debug info exists. 4571 ++SDNodeOrder; 4572 4573 // Check if address has undef value. 4574 if (isa<UndefValue>(Address) || 4575 (Address->use_empty() && !isa<Argument>(Address))) { 4576 DEBUG(dbgs() << "Dropping debug info for " << DI << "\n"); 4577 return 0; 4578 } 4579 4580 SDValue &N = NodeMap[Address]; 4581 if (!N.getNode() && isa<Argument>(Address)) 4582 // Check unused arguments map. 4583 N = UnusedArgNodeMap[Address]; 4584 SDDbgValue *SDV; 4585 if (N.getNode()) { 4586 if (const BitCastInst *BCI = dyn_cast<BitCastInst>(Address)) 4587 Address = BCI->getOperand(0); 4588 // Parameters are handled specially. 4589 bool isParameter = 4590 (DIVariable(Variable).getTag() == dwarf::DW_TAG_arg_variable || 4591 isa<Argument>(Address)); 4592 4593 const AllocaInst *AI = dyn_cast<AllocaInst>(Address); 4594 4595 if (isParameter && !AI) { 4596 FrameIndexSDNode *FINode = dyn_cast<FrameIndexSDNode>(N.getNode()); 4597 if (FINode) 4598 // Byval parameter. We have a frame index at this point. 4599 SDV = DAG.getDbgValue(Variable, FINode->getIndex(), 4600 0, dl, SDNodeOrder); 4601 else { 4602 // Address is an argument, so try to emit its dbg value using 4603 // virtual register info from the FuncInfo.ValueMap. 4604 EmitFuncArgumentDbgValue(Address, Variable, 0, N); 4605 return 0; 4606 } 4607 } else if (AI) 4608 SDV = DAG.getDbgValue(Variable, N.getNode(), N.getResNo(), 4609 0, dl, SDNodeOrder); 4610 else { 4611 // Can't do anything with other non-AI cases yet. 4612 DEBUG(dbgs() << "Dropping debug info for " << DI << "\n"); 4613 DEBUG(dbgs() << "non-AllocaInst issue for Address: \n\t"); 4614 DEBUG(Address->dump()); 4615 return 0; 4616 } 4617 DAG.AddDbgValue(SDV, N.getNode(), isParameter); 4618 } else { 4619 // If Address is an argument then try to emit its dbg value using 4620 // virtual register info from the FuncInfo.ValueMap. 4621 if (!EmitFuncArgumentDbgValue(Address, Variable, 0, N)) { 4622 // If variable is pinned by a alloca in dominating bb then 4623 // use StaticAllocaMap. 4624 if (const AllocaInst *AI = dyn_cast<AllocaInst>(Address)) { 4625 if (AI->getParent() != DI.getParent()) { 4626 DenseMap<const AllocaInst*, int>::iterator SI = 4627 FuncInfo.StaticAllocaMap.find(AI); 4628 if (SI != FuncInfo.StaticAllocaMap.end()) { 4629 SDV = DAG.getDbgValue(Variable, SI->second, 4630 0, dl, SDNodeOrder); 4631 DAG.AddDbgValue(SDV, 0, false); 4632 return 0; 4633 } 4634 } 4635 } 4636 DEBUG(dbgs() << "Dropping debug info for " << DI << "\n"); 4637 } 4638 } 4639 return 0; 4640 } 4641 case Intrinsic::dbg_value: { 4642 const DbgValueInst &DI = cast<DbgValueInst>(I); 4643 if (!DIVariable(DI.getVariable()).Verify()) 4644 return 0; 4645 4646 MDNode *Variable = DI.getVariable(); 4647 uint64_t Offset = DI.getOffset(); 4648 const Value *V = DI.getValue(); 4649 if (!V) 4650 return 0; 4651 4652 // Build an entry in DbgOrdering. Debug info input nodes get an SDNodeOrder 4653 // but do not always have a corresponding SDNode built. The SDNodeOrder 4654 // absolute, but not relative, values are different depending on whether 4655 // debug info exists. 4656 ++SDNodeOrder; 4657 SDDbgValue *SDV; 4658 if (isa<ConstantInt>(V) || isa<ConstantFP>(V) || isa<UndefValue>(V)) { 4659 SDV = DAG.getDbgValue(Variable, V, Offset, dl, SDNodeOrder); 4660 DAG.AddDbgValue(SDV, 0, false); 4661 } else { 4662 // Do not use getValue() in here; we don't want to generate code at 4663 // this point if it hasn't been done yet. 4664 SDValue N = NodeMap[V]; 4665 if (!N.getNode() && isa<Argument>(V)) 4666 // Check unused arguments map. 4667 N = UnusedArgNodeMap[V]; 4668 if (N.getNode()) { 4669 if (!EmitFuncArgumentDbgValue(V, Variable, Offset, N)) { 4670 SDV = DAG.getDbgValue(Variable, N.getNode(), 4671 N.getResNo(), Offset, dl, SDNodeOrder); 4672 DAG.AddDbgValue(SDV, N.getNode(), false); 4673 } 4674 } else if (!V->use_empty() ) { 4675 // Do not call getValue(V) yet, as we don't want to generate code. 4676 // Remember it for later. 4677 DanglingDebugInfo DDI(&DI, dl, SDNodeOrder); 4678 DanglingDebugInfoMap[V] = DDI; 4679 } else { 4680 // We may expand this to cover more cases. One case where we have no 4681 // data available is an unreferenced parameter. 4682 DEBUG(dbgs() << "Dropping debug info for " << DI << "\n"); 4683 } 4684 } 4685 4686 // Build a debug info table entry. 4687 if (const BitCastInst *BCI = dyn_cast<BitCastInst>(V)) 4688 V = BCI->getOperand(0); 4689 const AllocaInst *AI = dyn_cast<AllocaInst>(V); 4690 // Don't handle byval struct arguments or VLAs, for example. 4691 if (!AI) 4692 return 0; 4693 DenseMap<const AllocaInst*, int>::iterator SI = 4694 FuncInfo.StaticAllocaMap.find(AI); 4695 if (SI == FuncInfo.StaticAllocaMap.end()) 4696 return 0; // VLAs. 4697 int FI = SI->second; 4698 4699 MachineModuleInfo &MMI = DAG.getMachineFunction().getMMI(); 4700 if (!DI.getDebugLoc().isUnknown() && MMI.hasDebugInfo()) 4701 MMI.setVariableDbgInfo(Variable, FI, DI.getDebugLoc()); 4702 return 0; 4703 } 4704 4705 case Intrinsic::eh_typeid_for: { 4706 // Find the type id for the given typeinfo. 4707 GlobalVariable *GV = ExtractTypeInfo(I.getArgOperand(0)); 4708 unsigned TypeID = DAG.getMachineFunction().getMMI().getTypeIDFor(GV); 4709 Res = DAG.getConstant(TypeID, MVT::i32); 4710 setValue(&I, Res); 4711 return 0; 4712 } 4713 4714 case Intrinsic::eh_return_i32: 4715 case Intrinsic::eh_return_i64: 4716 DAG.getMachineFunction().getMMI().setCallsEHReturn(true); 4717 DAG.setRoot(DAG.getNode(ISD::EH_RETURN, dl, 4718 MVT::Other, 4719 getControlRoot(), 4720 getValue(I.getArgOperand(0)), 4721 getValue(I.getArgOperand(1)))); 4722 return 0; 4723 case Intrinsic::eh_unwind_init: 4724 DAG.getMachineFunction().getMMI().setCallsUnwindInit(true); 4725 return 0; 4726 case Intrinsic::eh_dwarf_cfa: { 4727 SDValue CfaArg = DAG.getSExtOrTrunc(getValue(I.getArgOperand(0)), dl, 4728 TLI.getPointerTy()); 4729 SDValue Offset = DAG.getNode(ISD::ADD, dl, 4730 TLI.getPointerTy(), 4731 DAG.getNode(ISD::FRAME_TO_ARGS_OFFSET, dl, 4732 TLI.getPointerTy()), 4733 CfaArg); 4734 SDValue FA = DAG.getNode(ISD::FRAMEADDR, dl, 4735 TLI.getPointerTy(), 4736 DAG.getConstant(0, TLI.getPointerTy())); 4737 setValue(&I, DAG.getNode(ISD::ADD, dl, TLI.getPointerTy(), 4738 FA, Offset)); 4739 return 0; 4740 } 4741 case Intrinsic::eh_sjlj_callsite: { 4742 MachineModuleInfo &MMI = DAG.getMachineFunction().getMMI(); 4743 ConstantInt *CI = dyn_cast<ConstantInt>(I.getArgOperand(0)); 4744 assert(CI && "Non-constant call site value in eh.sjlj.callsite!"); 4745 assert(MMI.getCurrentCallSite() == 0 && "Overlapping call sites!"); 4746 4747 MMI.setCurrentCallSite(CI->getZExtValue()); 4748 return 0; 4749 } 4750 case Intrinsic::eh_sjlj_functioncontext: { 4751 // Get and store the index of the function context. 4752 MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo(); 4753 AllocaInst *FnCtx = 4754 cast<AllocaInst>(I.getArgOperand(0)->stripPointerCasts()); 4755 int FI = FuncInfo.StaticAllocaMap[FnCtx]; 4756 MFI->setFunctionContextIndex(FI); 4757 return 0; 4758 } 4759 case Intrinsic::eh_sjlj_setjmp: { 4760 SDValue Ops[2]; 4761 Ops[0] = getRoot(); 4762 Ops[1] = getValue(I.getArgOperand(0)); 4763 SDValue Op = DAG.getNode(ISD::EH_SJLJ_SETJMP, dl, 4764 DAG.getVTList(MVT::i32, MVT::Other), 4765 Ops, 2); 4766 setValue(&I, Op.getValue(0)); 4767 DAG.setRoot(Op.getValue(1)); 4768 return 0; 4769 } 4770 case Intrinsic::eh_sjlj_longjmp: { 4771 DAG.setRoot(DAG.getNode(ISD::EH_SJLJ_LONGJMP, dl, MVT::Other, 4772 getRoot(), getValue(I.getArgOperand(0)))); 4773 return 0; 4774 } 4775 4776 case Intrinsic::x86_mmx_pslli_w: 4777 case Intrinsic::x86_mmx_pslli_d: 4778 case Intrinsic::x86_mmx_pslli_q: 4779 case Intrinsic::x86_mmx_psrli_w: 4780 case Intrinsic::x86_mmx_psrli_d: 4781 case Intrinsic::x86_mmx_psrli_q: 4782 case Intrinsic::x86_mmx_psrai_w: 4783 case Intrinsic::x86_mmx_psrai_d: { 4784 SDValue ShAmt = getValue(I.getArgOperand(1)); 4785 if (isa<ConstantSDNode>(ShAmt)) { 4786 visitTargetIntrinsic(I, Intrinsic); 4787 return 0; 4788 } 4789 unsigned NewIntrinsic = 0; 4790 EVT ShAmtVT = MVT::v2i32; 4791 switch (Intrinsic) { 4792 case Intrinsic::x86_mmx_pslli_w: 4793 NewIntrinsic = Intrinsic::x86_mmx_psll_w; 4794 break; 4795 case Intrinsic::x86_mmx_pslli_d: 4796 NewIntrinsic = Intrinsic::x86_mmx_psll_d; 4797 break; 4798 case Intrinsic::x86_mmx_pslli_q: 4799 NewIntrinsic = Intrinsic::x86_mmx_psll_q; 4800 break; 4801 case Intrinsic::x86_mmx_psrli_w: 4802 NewIntrinsic = Intrinsic::x86_mmx_psrl_w; 4803 break; 4804 case Intrinsic::x86_mmx_psrli_d: 4805 NewIntrinsic = Intrinsic::x86_mmx_psrl_d; 4806 break; 4807 case Intrinsic::x86_mmx_psrli_q: 4808 NewIntrinsic = Intrinsic::x86_mmx_psrl_q; 4809 break; 4810 case Intrinsic::x86_mmx_psrai_w: 4811 NewIntrinsic = Intrinsic::x86_mmx_psra_w; 4812 break; 4813 case Intrinsic::x86_mmx_psrai_d: 4814 NewIntrinsic = Intrinsic::x86_mmx_psra_d; 4815 break; 4816 default: llvm_unreachable("Impossible intrinsic"); // Can't reach here. 4817 } 4818 4819 // The vector shift intrinsics with scalars uses 32b shift amounts but 4820 // the sse2/mmx shift instructions reads 64 bits. Set the upper 32 bits 4821 // to be zero. 4822 // We must do this early because v2i32 is not a legal type. 4823 DebugLoc dl = getCurDebugLoc(); 4824 SDValue ShOps[2]; 4825 ShOps[0] = ShAmt; 4826 ShOps[1] = DAG.getConstant(0, MVT::i32); 4827 ShAmt = DAG.getNode(ISD::BUILD_VECTOR, dl, ShAmtVT, &ShOps[0], 2); 4828 EVT DestVT = TLI.getValueType(I.getType()); 4829 ShAmt = DAG.getNode(ISD::BITCAST, dl, DestVT, ShAmt); 4830 Res = DAG.getNode(ISD::INTRINSIC_WO_CHAIN, dl, DestVT, 4831 DAG.getConstant(NewIntrinsic, MVT::i32), 4832 getValue(I.getArgOperand(0)), ShAmt); 4833 setValue(&I, Res); 4834 return 0; 4835 } 4836 case Intrinsic::x86_avx_vinsertf128_pd_256: 4837 case Intrinsic::x86_avx_vinsertf128_ps_256: 4838 case Intrinsic::x86_avx_vinsertf128_si_256: { 4839 DebugLoc dl = getCurDebugLoc(); 4840 EVT DestVT = TLI.getValueType(I.getType()); 4841 EVT ElVT = TLI.getValueType(I.getArgOperand(1)->getType()); 4842 uint64_t Idx = (cast<ConstantInt>(I.getArgOperand(2))->getZExtValue() & 1) * 4843 ElVT.getVectorNumElements(); 4844 Res = DAG.getNode(ISD::INSERT_SUBVECTOR, dl, DestVT, 4845 getValue(I.getArgOperand(0)), 4846 getValue(I.getArgOperand(1)), 4847 DAG.getConstant(Idx, MVT::i32)); 4848 setValue(&I, Res); 4849 return 0; 4850 } 4851 case Intrinsic::convertff: 4852 case Intrinsic::convertfsi: 4853 case Intrinsic::convertfui: 4854 case Intrinsic::convertsif: 4855 case Intrinsic::convertuif: 4856 case Intrinsic::convertss: 4857 case Intrinsic::convertsu: 4858 case Intrinsic::convertus: 4859 case Intrinsic::convertuu: { 4860 ISD::CvtCode Code = ISD::CVT_INVALID; 4861 switch (Intrinsic) { 4862 case Intrinsic::convertff: Code = ISD::CVT_FF; break; 4863 case Intrinsic::convertfsi: Code = ISD::CVT_FS; break; 4864 case Intrinsic::convertfui: Code = ISD::CVT_FU; break; 4865 case Intrinsic::convertsif: Code = ISD::CVT_SF; break; 4866 case Intrinsic::convertuif: Code = ISD::CVT_UF; break; 4867 case Intrinsic::convertss: Code = ISD::CVT_SS; break; 4868 case Intrinsic::convertsu: Code = ISD::CVT_SU; break; 4869 case Intrinsic::convertus: Code = ISD::CVT_US; break; 4870 case Intrinsic::convertuu: Code = ISD::CVT_UU; break; 4871 } 4872 EVT DestVT = TLI.getValueType(I.getType()); 4873 const Value *Op1 = I.getArgOperand(0); 4874 Res = DAG.getConvertRndSat(DestVT, getCurDebugLoc(), getValue(Op1), 4875 DAG.getValueType(DestVT), 4876 DAG.getValueType(getValue(Op1).getValueType()), 4877 getValue(I.getArgOperand(1)), 4878 getValue(I.getArgOperand(2)), 4879 Code); 4880 setValue(&I, Res); 4881 return 0; 4882 } 4883 case Intrinsic::sqrt: 4884 setValue(&I, DAG.getNode(ISD::FSQRT, dl, 4885 getValue(I.getArgOperand(0)).getValueType(), 4886 getValue(I.getArgOperand(0)))); 4887 return 0; 4888 case Intrinsic::powi: 4889 setValue(&I, ExpandPowI(dl, getValue(I.getArgOperand(0)), 4890 getValue(I.getArgOperand(1)), DAG)); 4891 return 0; 4892 case Intrinsic::sin: 4893 setValue(&I, DAG.getNode(ISD::FSIN, dl, 4894 getValue(I.getArgOperand(0)).getValueType(), 4895 getValue(I.getArgOperand(0)))); 4896 return 0; 4897 case Intrinsic::cos: 4898 setValue(&I, DAG.getNode(ISD::FCOS, dl, 4899 getValue(I.getArgOperand(0)).getValueType(), 4900 getValue(I.getArgOperand(0)))); 4901 return 0; 4902 case Intrinsic::log: 4903 visitLog(I); 4904 return 0; 4905 case Intrinsic::log2: 4906 visitLog2(I); 4907 return 0; 4908 case Intrinsic::log10: 4909 visitLog10(I); 4910 return 0; 4911 case Intrinsic::exp: 4912 visitExp(I); 4913 return 0; 4914 case Intrinsic::exp2: 4915 visitExp2(I); 4916 return 0; 4917 case Intrinsic::pow: 4918 visitPow(I); 4919 return 0; 4920 case Intrinsic::fma: 4921 setValue(&I, DAG.getNode(ISD::FMA, dl, 4922 getValue(I.getArgOperand(0)).getValueType(), 4923 getValue(I.getArgOperand(0)), 4924 getValue(I.getArgOperand(1)), 4925 getValue(I.getArgOperand(2)))); 4926 return 0; 4927 case Intrinsic::convert_to_fp16: 4928 setValue(&I, DAG.getNode(ISD::FP32_TO_FP16, dl, 4929 MVT::i16, getValue(I.getArgOperand(0)))); 4930 return 0; 4931 case Intrinsic::convert_from_fp16: 4932 setValue(&I, DAG.getNode(ISD::FP16_TO_FP32, dl, 4933 MVT::f32, getValue(I.getArgOperand(0)))); 4934 return 0; 4935 case Intrinsic::pcmarker: { 4936 SDValue Tmp = getValue(I.getArgOperand(0)); 4937 DAG.setRoot(DAG.getNode(ISD::PCMARKER, dl, MVT::Other, getRoot(), Tmp)); 4938 return 0; 4939 } 4940 case Intrinsic::readcyclecounter: { 4941 SDValue Op = getRoot(); 4942 Res = DAG.getNode(ISD::READCYCLECOUNTER, dl, 4943 DAG.getVTList(MVT::i64, MVT::Other), 4944 &Op, 1); 4945 setValue(&I, Res); 4946 DAG.setRoot(Res.getValue(1)); 4947 return 0; 4948 } 4949 case Intrinsic::bswap: 4950 setValue(&I, DAG.getNode(ISD::BSWAP, dl, 4951 getValue(I.getArgOperand(0)).getValueType(), 4952 getValue(I.getArgOperand(0)))); 4953 return 0; 4954 case Intrinsic::cttz: { 4955 SDValue Arg = getValue(I.getArgOperand(0)); 4956 ConstantInt *CI = cast<ConstantInt>(I.getArgOperand(1)); 4957 EVT Ty = Arg.getValueType(); 4958 setValue(&I, DAG.getNode(CI->isZero() ? ISD::CTTZ : ISD::CTTZ_ZERO_UNDEF, 4959 dl, Ty, Arg)); 4960 return 0; 4961 } 4962 case Intrinsic::ctlz: { 4963 SDValue Arg = getValue(I.getArgOperand(0)); 4964 ConstantInt *CI = cast<ConstantInt>(I.getArgOperand(1)); 4965 EVT Ty = Arg.getValueType(); 4966 setValue(&I, DAG.getNode(CI->isZero() ? ISD::CTLZ : ISD::CTLZ_ZERO_UNDEF, 4967 dl, Ty, Arg)); 4968 return 0; 4969 } 4970 case Intrinsic::ctpop: { 4971 SDValue Arg = getValue(I.getArgOperand(0)); 4972 EVT Ty = Arg.getValueType(); 4973 setValue(&I, DAG.getNode(ISD::CTPOP, dl, Ty, Arg)); 4974 return 0; 4975 } 4976 case Intrinsic::stacksave: { 4977 SDValue Op = getRoot(); 4978 Res = DAG.getNode(ISD::STACKSAVE, dl, 4979 DAG.getVTList(TLI.getPointerTy(), MVT::Other), &Op, 1); 4980 setValue(&I, Res); 4981 DAG.setRoot(Res.getValue(1)); 4982 return 0; 4983 } 4984 case Intrinsic::stackrestore: { 4985 Res = getValue(I.getArgOperand(0)); 4986 DAG.setRoot(DAG.getNode(ISD::STACKRESTORE, dl, MVT::Other, getRoot(), Res)); 4987 return 0; 4988 } 4989 case Intrinsic::stackprotector: { 4990 // Emit code into the DAG to store the stack guard onto the stack. 4991 MachineFunction &MF = DAG.getMachineFunction(); 4992 MachineFrameInfo *MFI = MF.getFrameInfo(); 4993 EVT PtrTy = TLI.getPointerTy(); 4994 4995 SDValue Src = getValue(I.getArgOperand(0)); // The guard's value. 4996 AllocaInst *Slot = cast<AllocaInst>(I.getArgOperand(1)); 4997 4998 int FI = FuncInfo.StaticAllocaMap[Slot]; 4999 MFI->setStackProtectorIndex(FI); 5000 5001 SDValue FIN = DAG.getFrameIndex(FI, PtrTy); 5002 5003 // Store the stack protector onto the stack. 5004 Res = DAG.getStore(getRoot(), getCurDebugLoc(), Src, FIN, 5005 MachinePointerInfo::getFixedStack(FI), 5006 true, false, 0); 5007 setValue(&I, Res); 5008 DAG.setRoot(Res); 5009 return 0; 5010 } 5011 case Intrinsic::objectsize: { 5012 // If we don't know by now, we're never going to know. 5013 ConstantInt *CI = dyn_cast<ConstantInt>(I.getArgOperand(1)); 5014 5015 assert(CI && "Non-constant type in __builtin_object_size?"); 5016 5017 SDValue Arg = getValue(I.getCalledValue()); 5018 EVT Ty = Arg.getValueType(); 5019 5020 if (CI->isZero()) 5021 Res = DAG.getConstant(-1ULL, Ty); 5022 else 5023 Res = DAG.getConstant(0, Ty); 5024 5025 setValue(&I, Res); 5026 return 0; 5027 } 5028 case Intrinsic::var_annotation: 5029 // Discard annotate attributes 5030 return 0; 5031 5032 case Intrinsic::init_trampoline: { 5033 const Function *F = cast<Function>(I.getArgOperand(1)->stripPointerCasts()); 5034 5035 SDValue Ops[6]; 5036 Ops[0] = getRoot(); 5037 Ops[1] = getValue(I.getArgOperand(0)); 5038 Ops[2] = getValue(I.getArgOperand(1)); 5039 Ops[3] = getValue(I.getArgOperand(2)); 5040 Ops[4] = DAG.getSrcValue(I.getArgOperand(0)); 5041 Ops[5] = DAG.getSrcValue(F); 5042 5043 Res = DAG.getNode(ISD::INIT_TRAMPOLINE, dl, MVT::Other, Ops, 6); 5044 5045 DAG.setRoot(Res); 5046 return 0; 5047 } 5048 case Intrinsic::adjust_trampoline: { 5049 setValue(&I, DAG.getNode(ISD::ADJUST_TRAMPOLINE, dl, 5050 TLI.getPointerTy(), 5051 getValue(I.getArgOperand(0)))); 5052 return 0; 5053 } 5054 case Intrinsic::gcroot: 5055 if (GFI) { 5056 const Value *Alloca = I.getArgOperand(0); 5057 const Constant *TypeMap = cast<Constant>(I.getArgOperand(1)); 5058 5059 FrameIndexSDNode *FI = cast<FrameIndexSDNode>(getValue(Alloca).getNode()); 5060 GFI->addStackRoot(FI->getIndex(), TypeMap); 5061 } 5062 return 0; 5063 case Intrinsic::gcread: 5064 case Intrinsic::gcwrite: 5065 llvm_unreachable("GC failed to lower gcread/gcwrite intrinsics!"); 5066 case Intrinsic::flt_rounds: 5067 setValue(&I, DAG.getNode(ISD::FLT_ROUNDS_, dl, MVT::i32)); 5068 return 0; 5069 5070 case Intrinsic::expect: { 5071 // Just replace __builtin_expect(exp, c) with EXP. 5072 setValue(&I, getValue(I.getArgOperand(0))); 5073 return 0; 5074 } 5075 5076 case Intrinsic::trap: { 5077 StringRef TrapFuncName = TM.Options.getTrapFunctionName(); 5078 if (TrapFuncName.empty()) { 5079 DAG.setRoot(DAG.getNode(ISD::TRAP, dl,MVT::Other, getRoot())); 5080 return 0; 5081 } 5082 TargetLowering::ArgListTy Args; 5083 std::pair<SDValue, SDValue> Result = 5084 TLI.LowerCallTo(getRoot(), I.getType(), 5085 false, false, false, false, 0, CallingConv::C, 5086 /*isTailCall=*/false, 5087 /*doesNotRet=*/false, /*isReturnValueUsed=*/true, 5088 DAG.getExternalSymbol(TrapFuncName.data(), TLI.getPointerTy()), 5089 Args, DAG, getCurDebugLoc()); 5090 DAG.setRoot(Result.second); 5091 return 0; 5092 } 5093 case Intrinsic::uadd_with_overflow: 5094 return implVisitAluOverflow(I, ISD::UADDO); 5095 case Intrinsic::sadd_with_overflow: 5096 return implVisitAluOverflow(I, ISD::SADDO); 5097 case Intrinsic::usub_with_overflow: 5098 return implVisitAluOverflow(I, ISD::USUBO); 5099 case Intrinsic::ssub_with_overflow: 5100 return implVisitAluOverflow(I, ISD::SSUBO); 5101 case Intrinsic::umul_with_overflow: 5102 return implVisitAluOverflow(I, ISD::UMULO); 5103 case Intrinsic::smul_with_overflow: 5104 return implVisitAluOverflow(I, ISD::SMULO); 5105 5106 case Intrinsic::prefetch: { 5107 SDValue Ops[5]; 5108 unsigned rw = cast<ConstantInt>(I.getArgOperand(1))->getZExtValue(); 5109 Ops[0] = getRoot(); 5110 Ops[1] = getValue(I.getArgOperand(0)); 5111 Ops[2] = getValue(I.getArgOperand(1)); 5112 Ops[3] = getValue(I.getArgOperand(2)); 5113 Ops[4] = getValue(I.getArgOperand(3)); 5114 DAG.setRoot(DAG.getMemIntrinsicNode(ISD::PREFETCH, dl, 5115 DAG.getVTList(MVT::Other), 5116 &Ops[0], 5, 5117 EVT::getIntegerVT(*Context, 8), 5118 MachinePointerInfo(I.getArgOperand(0)), 5119 0, /* align */ 5120 false, /* volatile */ 5121 rw==0, /* read */ 5122 rw==1)); /* write */ 5123 return 0; 5124 } 5125 5126 case Intrinsic::invariant_start: 5127 case Intrinsic::lifetime_start: 5128 // Discard region information. 5129 setValue(&I, DAG.getUNDEF(TLI.getPointerTy())); 5130 return 0; 5131 case Intrinsic::invariant_end: 5132 case Intrinsic::lifetime_end: 5133 // Discard region information. 5134 return 0; 5135 } 5136} 5137 5138void SelectionDAGBuilder::LowerCallTo(ImmutableCallSite CS, SDValue Callee, 5139 bool isTailCall, 5140 MachineBasicBlock *LandingPad) { 5141 PointerType *PT = cast<PointerType>(CS.getCalledValue()->getType()); 5142 FunctionType *FTy = cast<FunctionType>(PT->getElementType()); 5143 Type *RetTy = FTy->getReturnType(); 5144 MachineModuleInfo &MMI = DAG.getMachineFunction().getMMI(); 5145 MCSymbol *BeginLabel = 0; 5146 5147 TargetLowering::ArgListTy Args; 5148 TargetLowering::ArgListEntry Entry; 5149 Args.reserve(CS.arg_size()); 5150 5151 // Check whether the function can return without sret-demotion. 5152 SmallVector<ISD::OutputArg, 4> Outs; 5153 SmallVector<uint64_t, 4> Offsets; 5154 GetReturnInfo(RetTy, CS.getAttributes().getRetAttributes(), 5155 Outs, TLI, &Offsets); 5156 5157 bool CanLowerReturn = TLI.CanLowerReturn(CS.getCallingConv(), 5158 DAG.getMachineFunction(), 5159 FTy->isVarArg(), Outs, 5160 FTy->getContext()); 5161 5162 SDValue DemoteStackSlot; 5163 int DemoteStackIdx = -100; 5164 5165 if (!CanLowerReturn) { 5166 uint64_t TySize = TLI.getTargetData()->getTypeAllocSize( 5167 FTy->getReturnType()); 5168 unsigned Align = TLI.getTargetData()->getPrefTypeAlignment( 5169 FTy->getReturnType()); 5170 MachineFunction &MF = DAG.getMachineFunction(); 5171 DemoteStackIdx = MF.getFrameInfo()->CreateStackObject(TySize, Align, false); 5172 Type *StackSlotPtrType = PointerType::getUnqual(FTy->getReturnType()); 5173 5174 DemoteStackSlot = DAG.getFrameIndex(DemoteStackIdx, TLI.getPointerTy()); 5175 Entry.Node = DemoteStackSlot; 5176 Entry.Ty = StackSlotPtrType; 5177 Entry.isSExt = false; 5178 Entry.isZExt = false; 5179 Entry.isInReg = false; 5180 Entry.isSRet = true; 5181 Entry.isNest = false; 5182 Entry.isByVal = false; 5183 Entry.Alignment = Align; 5184 Args.push_back(Entry); 5185 RetTy = Type::getVoidTy(FTy->getContext()); 5186 } 5187 5188 for (ImmutableCallSite::arg_iterator i = CS.arg_begin(), e = CS.arg_end(); 5189 i != e; ++i) { 5190 const Value *V = *i; 5191 5192 // Skip empty types 5193 if (V->getType()->isEmptyTy()) 5194 continue; 5195 5196 SDValue ArgNode = getValue(V); 5197 Entry.Node = ArgNode; Entry.Ty = V->getType(); 5198 5199 unsigned attrInd = i - CS.arg_begin() + 1; 5200 Entry.isSExt = CS.paramHasAttr(attrInd, Attribute::SExt); 5201 Entry.isZExt = CS.paramHasAttr(attrInd, Attribute::ZExt); 5202 Entry.isInReg = CS.paramHasAttr(attrInd, Attribute::InReg); 5203 Entry.isSRet = CS.paramHasAttr(attrInd, Attribute::StructRet); 5204 Entry.isNest = CS.paramHasAttr(attrInd, Attribute::Nest); 5205 Entry.isByVal = CS.paramHasAttr(attrInd, Attribute::ByVal); 5206 Entry.Alignment = CS.getParamAlignment(attrInd); 5207 Args.push_back(Entry); 5208 } 5209 5210 if (LandingPad) { 5211 // Insert a label before the invoke call to mark the try range. This can be 5212 // used to detect deletion of the invoke via the MachineModuleInfo. 5213 BeginLabel = MMI.getContext().CreateTempSymbol(); 5214 5215 // For SjLj, keep track of which landing pads go with which invokes 5216 // so as to maintain the ordering of pads in the LSDA. 5217 unsigned CallSiteIndex = MMI.getCurrentCallSite(); 5218 if (CallSiteIndex) { 5219 MMI.setCallSiteBeginLabel(BeginLabel, CallSiteIndex); 5220 LPadToCallSiteMap[LandingPad].push_back(CallSiteIndex); 5221 5222 // Now that the call site is handled, stop tracking it. 5223 MMI.setCurrentCallSite(0); 5224 } 5225 5226 // Both PendingLoads and PendingExports must be flushed here; 5227 // this call might not return. 5228 (void)getRoot(); 5229 DAG.setRoot(DAG.getEHLabel(getCurDebugLoc(), getControlRoot(), BeginLabel)); 5230 } 5231 5232 // Check if target-independent constraints permit a tail call here. 5233 // Target-dependent constraints are checked within TLI.LowerCallTo. 5234 if (isTailCall && 5235 !isInTailCallPosition(CS, CS.getAttributes().getRetAttributes(), TLI)) 5236 isTailCall = false; 5237 5238 // If there's a possibility that fast-isel has already selected some amount 5239 // of the current basic block, don't emit a tail call. 5240 if (isTailCall && TM.Options.EnableFastISel) 5241 isTailCall = false; 5242 5243 std::pair<SDValue,SDValue> Result = 5244 TLI.LowerCallTo(getRoot(), RetTy, 5245 CS.paramHasAttr(0, Attribute::SExt), 5246 CS.paramHasAttr(0, Attribute::ZExt), FTy->isVarArg(), 5247 CS.paramHasAttr(0, Attribute::InReg), FTy->getNumParams(), 5248 CS.getCallingConv(), 5249 isTailCall, 5250 CS.doesNotReturn(), 5251 !CS.getInstruction()->use_empty(), 5252 Callee, Args, DAG, getCurDebugLoc()); 5253 assert((isTailCall || Result.second.getNode()) && 5254 "Non-null chain expected with non-tail call!"); 5255 assert((Result.second.getNode() || !Result.first.getNode()) && 5256 "Null value expected with tail call!"); 5257 if (Result.first.getNode()) { 5258 setValue(CS.getInstruction(), Result.first); 5259 } else if (!CanLowerReturn && Result.second.getNode()) { 5260 // The instruction result is the result of loading from the 5261 // hidden sret parameter. 5262 SmallVector<EVT, 1> PVTs; 5263 Type *PtrRetTy = PointerType::getUnqual(FTy->getReturnType()); 5264 5265 ComputeValueVTs(TLI, PtrRetTy, PVTs); 5266 assert(PVTs.size() == 1 && "Pointers should fit in one register"); 5267 EVT PtrVT = PVTs[0]; 5268 unsigned NumValues = Outs.size(); 5269 SmallVector<SDValue, 4> Values(NumValues); 5270 SmallVector<SDValue, 4> Chains(NumValues); 5271 5272 for (unsigned i = 0; i < NumValues; ++i) { 5273 SDValue Add = DAG.getNode(ISD::ADD, getCurDebugLoc(), PtrVT, 5274 DemoteStackSlot, 5275 DAG.getConstant(Offsets[i], PtrVT)); 5276 SDValue L = DAG.getLoad(Outs[i].VT, getCurDebugLoc(), Result.second, 5277 Add, 5278 MachinePointerInfo::getFixedStack(DemoteStackIdx, Offsets[i]), 5279 false, false, false, 1); 5280 Values[i] = L; 5281 Chains[i] = L.getValue(1); 5282 } 5283 5284 SDValue Chain = DAG.getNode(ISD::TokenFactor, getCurDebugLoc(), 5285 MVT::Other, &Chains[0], NumValues); 5286 PendingLoads.push_back(Chain); 5287 5288 // Collect the legal value parts into potentially illegal values 5289 // that correspond to the original function's return values. 5290 SmallVector<EVT, 4> RetTys; 5291 RetTy = FTy->getReturnType(); 5292 ComputeValueVTs(TLI, RetTy, RetTys); 5293 ISD::NodeType AssertOp = ISD::DELETED_NODE; 5294 SmallVector<SDValue, 4> ReturnValues; 5295 unsigned CurReg = 0; 5296 for (unsigned I = 0, E = RetTys.size(); I != E; ++I) { 5297 EVT VT = RetTys[I]; 5298 EVT RegisterVT = TLI.getRegisterType(RetTy->getContext(), VT); 5299 unsigned NumRegs = TLI.getNumRegisters(RetTy->getContext(), VT); 5300 5301 SDValue ReturnValue = 5302 getCopyFromParts(DAG, getCurDebugLoc(), &Values[CurReg], NumRegs, 5303 RegisterVT, VT, AssertOp); 5304 ReturnValues.push_back(ReturnValue); 5305 CurReg += NumRegs; 5306 } 5307 5308 setValue(CS.getInstruction(), 5309 DAG.getNode(ISD::MERGE_VALUES, getCurDebugLoc(), 5310 DAG.getVTList(&RetTys[0], RetTys.size()), 5311 &ReturnValues[0], ReturnValues.size())); 5312 } 5313 5314 // Assign order to nodes here. If the call does not produce a result, it won't 5315 // be mapped to a SDNode and visit() will not assign it an order number. 5316 if (!Result.second.getNode()) { 5317 // As a special case, a null chain means that a tail call has been emitted and 5318 // the DAG root is already updated. 5319 HasTailCall = true; 5320 ++SDNodeOrder; 5321 AssignOrderingToNode(DAG.getRoot().getNode()); 5322 } else { 5323 DAG.setRoot(Result.second); 5324 ++SDNodeOrder; 5325 AssignOrderingToNode(Result.second.getNode()); 5326 } 5327 5328 if (LandingPad) { 5329 // Insert a label at the end of the invoke call to mark the try range. This 5330 // can be used to detect deletion of the invoke via the MachineModuleInfo. 5331 MCSymbol *EndLabel = MMI.getContext().CreateTempSymbol(); 5332 DAG.setRoot(DAG.getEHLabel(getCurDebugLoc(), getRoot(), EndLabel)); 5333 5334 // Inform MachineModuleInfo of range. 5335 MMI.addInvoke(LandingPad, BeginLabel, EndLabel); 5336 } 5337} 5338 5339/// IsOnlyUsedInZeroEqualityComparison - Return true if it only matters that the 5340/// value is equal or not-equal to zero. 5341static bool IsOnlyUsedInZeroEqualityComparison(const Value *V) { 5342 for (Value::const_use_iterator UI = V->use_begin(), E = V->use_end(); 5343 UI != E; ++UI) { 5344 if (const ICmpInst *IC = dyn_cast<ICmpInst>(*UI)) 5345 if (IC->isEquality()) 5346 if (const Constant *C = dyn_cast<Constant>(IC->getOperand(1))) 5347 if (C->isNullValue()) 5348 continue; 5349 // Unknown instruction. 5350 return false; 5351 } 5352 return true; 5353} 5354 5355static SDValue getMemCmpLoad(const Value *PtrVal, MVT LoadVT, 5356 Type *LoadTy, 5357 SelectionDAGBuilder &Builder) { 5358 5359 // Check to see if this load can be trivially constant folded, e.g. if the 5360 // input is from a string literal. 5361 if (const Constant *LoadInput = dyn_cast<Constant>(PtrVal)) { 5362 // Cast pointer to the type we really want to load. 5363 LoadInput = ConstantExpr::getBitCast(const_cast<Constant *>(LoadInput), 5364 PointerType::getUnqual(LoadTy)); 5365 5366 if (const Constant *LoadCst = 5367 ConstantFoldLoadFromConstPtr(const_cast<Constant *>(LoadInput), 5368 Builder.TD)) 5369 return Builder.getValue(LoadCst); 5370 } 5371 5372 // Otherwise, we have to emit the load. If the pointer is to unfoldable but 5373 // still constant memory, the input chain can be the entry node. 5374 SDValue Root; 5375 bool ConstantMemory = false; 5376 5377 // Do not serialize (non-volatile) loads of constant memory with anything. 5378 if (Builder.AA->pointsToConstantMemory(PtrVal)) { 5379 Root = Builder.DAG.getEntryNode(); 5380 ConstantMemory = true; 5381 } else { 5382 // Do not serialize non-volatile loads against each other. 5383 Root = Builder.DAG.getRoot(); 5384 } 5385 5386 SDValue Ptr = Builder.getValue(PtrVal); 5387 SDValue LoadVal = Builder.DAG.getLoad(LoadVT, Builder.getCurDebugLoc(), Root, 5388 Ptr, MachinePointerInfo(PtrVal), 5389 false /*volatile*/, 5390 false /*nontemporal*/, 5391 false /*isinvariant*/, 1 /* align=1 */); 5392 5393 if (!ConstantMemory) 5394 Builder.PendingLoads.push_back(LoadVal.getValue(1)); 5395 return LoadVal; 5396} 5397 5398 5399/// visitMemCmpCall - See if we can lower a call to memcmp in an optimized form. 5400/// If so, return true and lower it, otherwise return false and it will be 5401/// lowered like a normal call. 5402bool SelectionDAGBuilder::visitMemCmpCall(const CallInst &I) { 5403 // Verify that the prototype makes sense. int memcmp(void*,void*,size_t) 5404 if (I.getNumArgOperands() != 3) 5405 return false; 5406 5407 const Value *LHS = I.getArgOperand(0), *RHS = I.getArgOperand(1); 5408 if (!LHS->getType()->isPointerTy() || !RHS->getType()->isPointerTy() || 5409 !I.getArgOperand(2)->getType()->isIntegerTy() || 5410 !I.getType()->isIntegerTy()) 5411 return false; 5412 5413 const ConstantInt *Size = dyn_cast<ConstantInt>(I.getArgOperand(2)); 5414 5415 // memcmp(S1,S2,2) != 0 -> (*(short*)LHS != *(short*)RHS) != 0 5416 // memcmp(S1,S2,4) != 0 -> (*(int*)LHS != *(int*)RHS) != 0 5417 if (Size && IsOnlyUsedInZeroEqualityComparison(&I)) { 5418 bool ActuallyDoIt = true; 5419 MVT LoadVT; 5420 Type *LoadTy; 5421 switch (Size->getZExtValue()) { 5422 default: 5423 LoadVT = MVT::Other; 5424 LoadTy = 0; 5425 ActuallyDoIt = false; 5426 break; 5427 case 2: 5428 LoadVT = MVT::i16; 5429 LoadTy = Type::getInt16Ty(Size->getContext()); 5430 break; 5431 case 4: 5432 LoadVT = MVT::i32; 5433 LoadTy = Type::getInt32Ty(Size->getContext()); 5434 break; 5435 case 8: 5436 LoadVT = MVT::i64; 5437 LoadTy = Type::getInt64Ty(Size->getContext()); 5438 break; 5439 /* 5440 case 16: 5441 LoadVT = MVT::v4i32; 5442 LoadTy = Type::getInt32Ty(Size->getContext()); 5443 LoadTy = VectorType::get(LoadTy, 4); 5444 break; 5445 */ 5446 } 5447 5448 // This turns into unaligned loads. We only do this if the target natively 5449 // supports the MVT we'll be loading or if it is small enough (<= 4) that 5450 // we'll only produce a small number of byte loads. 5451 5452 // Require that we can find a legal MVT, and only do this if the target 5453 // supports unaligned loads of that type. Expanding into byte loads would 5454 // bloat the code. 5455 if (ActuallyDoIt && Size->getZExtValue() > 4) { 5456 // TODO: Handle 5 byte compare as 4-byte + 1 byte. 5457 // TODO: Handle 8 byte compare on x86-32 as two 32-bit loads. 5458 if (!TLI.isTypeLegal(LoadVT) ||!TLI.allowsUnalignedMemoryAccesses(LoadVT)) 5459 ActuallyDoIt = false; 5460 } 5461 5462 if (ActuallyDoIt) { 5463 SDValue LHSVal = getMemCmpLoad(LHS, LoadVT, LoadTy, *this); 5464 SDValue RHSVal = getMemCmpLoad(RHS, LoadVT, LoadTy, *this); 5465 5466 SDValue Res = DAG.getSetCC(getCurDebugLoc(), MVT::i1, LHSVal, RHSVal, 5467 ISD::SETNE); 5468 EVT CallVT = TLI.getValueType(I.getType(), true); 5469 setValue(&I, DAG.getZExtOrTrunc(Res, getCurDebugLoc(), CallVT)); 5470 return true; 5471 } 5472 } 5473 5474 5475 return false; 5476} 5477 5478 5479void SelectionDAGBuilder::visitCall(const CallInst &I) { 5480 // Handle inline assembly differently. 5481 if (isa<InlineAsm>(I.getCalledValue())) { 5482 visitInlineAsm(&I); 5483 return; 5484 } 5485 5486 MachineModuleInfo &MMI = DAG.getMachineFunction().getMMI(); 5487 ComputeUsesVAFloatArgument(I, &MMI); 5488 5489 const char *RenameFn = 0; 5490 if (Function *F = I.getCalledFunction()) { 5491 if (F->isDeclaration()) { 5492 if (const TargetIntrinsicInfo *II = TM.getIntrinsicInfo()) { 5493 if (unsigned IID = II->getIntrinsicID(F)) { 5494 RenameFn = visitIntrinsicCall(I, IID); 5495 if (!RenameFn) 5496 return; 5497 } 5498 } 5499 if (unsigned IID = F->getIntrinsicID()) { 5500 RenameFn = visitIntrinsicCall(I, IID); 5501 if (!RenameFn) 5502 return; 5503 } 5504 } 5505 5506 // Check for well-known libc/libm calls. If the function is internal, it 5507 // can't be a library call. 5508 if (!F->hasLocalLinkage() && F->hasName()) { 5509 StringRef Name = F->getName(); 5510 if ((LibInfo->has(LibFunc::copysign) && Name == "copysign") || 5511 (LibInfo->has(LibFunc::copysignf) && Name == "copysignf") || 5512 (LibInfo->has(LibFunc::copysignl) && Name == "copysignl")) { 5513 if (I.getNumArgOperands() == 2 && // Basic sanity checks. 5514 I.getArgOperand(0)->getType()->isFloatingPointTy() && 5515 I.getType() == I.getArgOperand(0)->getType() && 5516 I.getType() == I.getArgOperand(1)->getType()) { 5517 SDValue LHS = getValue(I.getArgOperand(0)); 5518 SDValue RHS = getValue(I.getArgOperand(1)); 5519 setValue(&I, DAG.getNode(ISD::FCOPYSIGN, getCurDebugLoc(), 5520 LHS.getValueType(), LHS, RHS)); 5521 return; 5522 } 5523 } else if ((LibInfo->has(LibFunc::fabs) && Name == "fabs") || 5524 (LibInfo->has(LibFunc::fabsf) && Name == "fabsf") || 5525 (LibInfo->has(LibFunc::fabsl) && Name == "fabsl")) { 5526 if (I.getNumArgOperands() == 1 && // Basic sanity checks. 5527 I.getArgOperand(0)->getType()->isFloatingPointTy() && 5528 I.getType() == I.getArgOperand(0)->getType()) { 5529 SDValue Tmp = getValue(I.getArgOperand(0)); 5530 setValue(&I, DAG.getNode(ISD::FABS, getCurDebugLoc(), 5531 Tmp.getValueType(), Tmp)); 5532 return; 5533 } 5534 } else if ((LibInfo->has(LibFunc::sin) && Name == "sin") || 5535 (LibInfo->has(LibFunc::sinf) && Name == "sinf") || 5536 (LibInfo->has(LibFunc::sinl) && Name == "sinl")) { 5537 if (I.getNumArgOperands() == 1 && // Basic sanity checks. 5538 I.getArgOperand(0)->getType()->isFloatingPointTy() && 5539 I.getType() == I.getArgOperand(0)->getType() && 5540 I.onlyReadsMemory()) { 5541 SDValue Tmp = getValue(I.getArgOperand(0)); 5542 setValue(&I, DAG.getNode(ISD::FSIN, getCurDebugLoc(), 5543 Tmp.getValueType(), Tmp)); 5544 return; 5545 } 5546 } else if ((LibInfo->has(LibFunc::cos) && Name == "cos") || 5547 (LibInfo->has(LibFunc::cosf) && Name == "cosf") || 5548 (LibInfo->has(LibFunc::cosl) && Name == "cosl")) { 5549 if (I.getNumArgOperands() == 1 && // Basic sanity checks. 5550 I.getArgOperand(0)->getType()->isFloatingPointTy() && 5551 I.getType() == I.getArgOperand(0)->getType() && 5552 I.onlyReadsMemory()) { 5553 SDValue Tmp = getValue(I.getArgOperand(0)); 5554 setValue(&I, DAG.getNode(ISD::FCOS, getCurDebugLoc(), 5555 Tmp.getValueType(), Tmp)); 5556 return; 5557 } 5558 } else if ((LibInfo->has(LibFunc::sqrt) && Name == "sqrt") || 5559 (LibInfo->has(LibFunc::sqrtf) && Name == "sqrtf") || 5560 (LibInfo->has(LibFunc::sqrtl) && Name == "sqrtl")) { 5561 if (I.getNumArgOperands() == 1 && // Basic sanity checks. 5562 I.getArgOperand(0)->getType()->isFloatingPointTy() && 5563 I.getType() == I.getArgOperand(0)->getType() && 5564 I.onlyReadsMemory()) { 5565 SDValue Tmp = getValue(I.getArgOperand(0)); 5566 setValue(&I, DAG.getNode(ISD::FSQRT, getCurDebugLoc(), 5567 Tmp.getValueType(), Tmp)); 5568 return; 5569 } 5570 } else if ((LibInfo->has(LibFunc::floor) && Name == "floor") || 5571 (LibInfo->has(LibFunc::floorf) && Name == "floorf") || 5572 (LibInfo->has(LibFunc::floorl) && Name == "floorl")) { 5573 if (I.getNumArgOperands() == 1 && // Basic sanity checks. 5574 I.getArgOperand(0)->getType()->isFloatingPointTy() && 5575 I.getType() == I.getArgOperand(0)->getType()) { 5576 SDValue Tmp = getValue(I.getArgOperand(0)); 5577 setValue(&I, DAG.getNode(ISD::FFLOOR, getCurDebugLoc(), 5578 Tmp.getValueType(), Tmp)); 5579 return; 5580 } 5581 } else if ((LibInfo->has(LibFunc::nearbyint) && Name == "nearbyint") || 5582 (LibInfo->has(LibFunc::nearbyintf) && Name == "nearbyintf") || 5583 (LibInfo->has(LibFunc::nearbyintl) && Name == "nearbyintl")) { 5584 if (I.getNumArgOperands() == 1 && // Basic sanity checks. 5585 I.getArgOperand(0)->getType()->isFloatingPointTy() && 5586 I.getType() == I.getArgOperand(0)->getType()) { 5587 SDValue Tmp = getValue(I.getArgOperand(0)); 5588 setValue(&I, DAG.getNode(ISD::FNEARBYINT, getCurDebugLoc(), 5589 Tmp.getValueType(), Tmp)); 5590 return; 5591 } 5592 } else if ((LibInfo->has(LibFunc::ceil) && Name == "ceil") || 5593 (LibInfo->has(LibFunc::ceilf) && Name == "ceilf") || 5594 (LibInfo->has(LibFunc::ceill) && Name == "ceill")) { 5595 if (I.getNumArgOperands() == 1 && // Basic sanity checks. 5596 I.getArgOperand(0)->getType()->isFloatingPointTy() && 5597 I.getType() == I.getArgOperand(0)->getType()) { 5598 SDValue Tmp = getValue(I.getArgOperand(0)); 5599 setValue(&I, DAG.getNode(ISD::FCEIL, getCurDebugLoc(), 5600 Tmp.getValueType(), Tmp)); 5601 return; 5602 } 5603 } else if ((LibInfo->has(LibFunc::rint) && Name == "rint") || 5604 (LibInfo->has(LibFunc::rintf) && Name == "rintf") || 5605 (LibInfo->has(LibFunc::rintl) && Name == "rintl")) { 5606 if (I.getNumArgOperands() == 1 && // Basic sanity checks. 5607 I.getArgOperand(0)->getType()->isFloatingPointTy() && 5608 I.getType() == I.getArgOperand(0)->getType()) { 5609 SDValue Tmp = getValue(I.getArgOperand(0)); 5610 setValue(&I, DAG.getNode(ISD::FRINT, getCurDebugLoc(), 5611 Tmp.getValueType(), Tmp)); 5612 return; 5613 } 5614 } else if ((LibInfo->has(LibFunc::trunc) && Name == "trunc") || 5615 (LibInfo->has(LibFunc::truncf) && Name == "truncf") || 5616 (LibInfo->has(LibFunc::truncl) && Name == "truncl")) { 5617 if (I.getNumArgOperands() == 1 && // Basic sanity checks. 5618 I.getArgOperand(0)->getType()->isFloatingPointTy() && 5619 I.getType() == I.getArgOperand(0)->getType()) { 5620 SDValue Tmp = getValue(I.getArgOperand(0)); 5621 setValue(&I, DAG.getNode(ISD::FTRUNC, getCurDebugLoc(), 5622 Tmp.getValueType(), Tmp)); 5623 return; 5624 } 5625 } else if ((LibInfo->has(LibFunc::log2) && Name == "log2") || 5626 (LibInfo->has(LibFunc::log2f) && Name == "log2f") || 5627 (LibInfo->has(LibFunc::log2l) && Name == "log2l")) { 5628 if (I.getNumArgOperands() == 1 && // Basic sanity checks. 5629 I.getArgOperand(0)->getType()->isFloatingPointTy() && 5630 I.getType() == I.getArgOperand(0)->getType() && 5631 I.onlyReadsMemory()) { 5632 SDValue Tmp = getValue(I.getArgOperand(0)); 5633 setValue(&I, DAG.getNode(ISD::FLOG2, getCurDebugLoc(), 5634 Tmp.getValueType(), Tmp)); 5635 return; 5636 } 5637 } else if ((LibInfo->has(LibFunc::exp2) && Name == "exp2") || 5638 (LibInfo->has(LibFunc::exp2f) && Name == "exp2f") || 5639 (LibInfo->has(LibFunc::exp2l) && Name == "exp2l")) { 5640 if (I.getNumArgOperands() == 1 && // Basic sanity checks. 5641 I.getArgOperand(0)->getType()->isFloatingPointTy() && 5642 I.getType() == I.getArgOperand(0)->getType() && 5643 I.onlyReadsMemory()) { 5644 SDValue Tmp = getValue(I.getArgOperand(0)); 5645 setValue(&I, DAG.getNode(ISD::FEXP2, getCurDebugLoc(), 5646 Tmp.getValueType(), Tmp)); 5647 return; 5648 } 5649 } else if (Name == "memcmp") { 5650 if (visitMemCmpCall(I)) 5651 return; 5652 } 5653 } 5654 } 5655 5656 SDValue Callee; 5657 if (!RenameFn) 5658 Callee = getValue(I.getCalledValue()); 5659 else 5660 Callee = DAG.getExternalSymbol(RenameFn, TLI.getPointerTy()); 5661 5662 // Check if we can potentially perform a tail call. More detailed checking is 5663 // be done within LowerCallTo, after more information about the call is known. 5664 LowerCallTo(&I, Callee, I.isTailCall()); 5665} 5666 5667namespace { 5668 5669/// AsmOperandInfo - This contains information for each constraint that we are 5670/// lowering. 5671class SDISelAsmOperandInfo : public TargetLowering::AsmOperandInfo { 5672public: 5673 /// CallOperand - If this is the result output operand or a clobber 5674 /// this is null, otherwise it is the incoming operand to the CallInst. 5675 /// This gets modified as the asm is processed. 5676 SDValue CallOperand; 5677 5678 /// AssignedRegs - If this is a register or register class operand, this 5679 /// contains the set of register corresponding to the operand. 5680 RegsForValue AssignedRegs; 5681 5682 explicit SDISelAsmOperandInfo(const TargetLowering::AsmOperandInfo &info) 5683 : TargetLowering::AsmOperandInfo(info), CallOperand(0,0) { 5684 } 5685 5686 /// getCallOperandValEVT - Return the EVT of the Value* that this operand 5687 /// corresponds to. If there is no Value* for this operand, it returns 5688 /// MVT::Other. 5689 EVT getCallOperandValEVT(LLVMContext &Context, 5690 const TargetLowering &TLI, 5691 const TargetData *TD) const { 5692 if (CallOperandVal == 0) return MVT::Other; 5693 5694 if (isa<BasicBlock>(CallOperandVal)) 5695 return TLI.getPointerTy(); 5696 5697 llvm::Type *OpTy = CallOperandVal->getType(); 5698 5699 // FIXME: code duplicated from TargetLowering::ParseConstraints(). 5700 // If this is an indirect operand, the operand is a pointer to the 5701 // accessed type. 5702 if (isIndirect) { 5703 llvm::PointerType *PtrTy = dyn_cast<PointerType>(OpTy); 5704 if (!PtrTy) 5705 report_fatal_error("Indirect operand for inline asm not a pointer!"); 5706 OpTy = PtrTy->getElementType(); 5707 } 5708 5709 // Look for vector wrapped in a struct. e.g. { <16 x i8> }. 5710 if (StructType *STy = dyn_cast<StructType>(OpTy)) 5711 if (STy->getNumElements() == 1) 5712 OpTy = STy->getElementType(0); 5713 5714 // If OpTy is not a single value, it may be a struct/union that we 5715 // can tile with integers. 5716 if (!OpTy->isSingleValueType() && OpTy->isSized()) { 5717 unsigned BitSize = TD->getTypeSizeInBits(OpTy); 5718 switch (BitSize) { 5719 default: break; 5720 case 1: 5721 case 8: 5722 case 16: 5723 case 32: 5724 case 64: 5725 case 128: 5726 OpTy = IntegerType::get(Context, BitSize); 5727 break; 5728 } 5729 } 5730 5731 return TLI.getValueType(OpTy, true); 5732 } 5733}; 5734 5735typedef SmallVector<SDISelAsmOperandInfo,16> SDISelAsmOperandInfoVector; 5736 5737} // end anonymous namespace 5738 5739/// GetRegistersForValue - Assign registers (virtual or physical) for the 5740/// specified operand. We prefer to assign virtual registers, to allow the 5741/// register allocator to handle the assignment process. However, if the asm 5742/// uses features that we can't model on machineinstrs, we have SDISel do the 5743/// allocation. This produces generally horrible, but correct, code. 5744/// 5745/// OpInfo describes the operand. 5746/// 5747static void GetRegistersForValue(SelectionDAG &DAG, 5748 const TargetLowering &TLI, 5749 DebugLoc DL, 5750 SDISelAsmOperandInfo &OpInfo) { 5751 LLVMContext &Context = *DAG.getContext(); 5752 5753 MachineFunction &MF = DAG.getMachineFunction(); 5754 SmallVector<unsigned, 4> Regs; 5755 5756 // If this is a constraint for a single physreg, or a constraint for a 5757 // register class, find it. 5758 std::pair<unsigned, const TargetRegisterClass*> PhysReg = 5759 TLI.getRegForInlineAsmConstraint(OpInfo.ConstraintCode, 5760 OpInfo.ConstraintVT); 5761 5762 unsigned NumRegs = 1; 5763 if (OpInfo.ConstraintVT != MVT::Other) { 5764 // If this is a FP input in an integer register (or visa versa) insert a bit 5765 // cast of the input value. More generally, handle any case where the input 5766 // value disagrees with the register class we plan to stick this in. 5767 if (OpInfo.Type == InlineAsm::isInput && 5768 PhysReg.second && !PhysReg.second->hasType(OpInfo.ConstraintVT)) { 5769 // Try to convert to the first EVT that the reg class contains. If the 5770 // types are identical size, use a bitcast to convert (e.g. two differing 5771 // vector types). 5772 EVT RegVT = *PhysReg.second->vt_begin(); 5773 if (RegVT.getSizeInBits() == OpInfo.ConstraintVT.getSizeInBits()) { 5774 OpInfo.CallOperand = DAG.getNode(ISD::BITCAST, DL, 5775 RegVT, OpInfo.CallOperand); 5776 OpInfo.ConstraintVT = RegVT; 5777 } else if (RegVT.isInteger() && OpInfo.ConstraintVT.isFloatingPoint()) { 5778 // If the input is a FP value and we want it in FP registers, do a 5779 // bitcast to the corresponding integer type. This turns an f64 value 5780 // into i64, which can be passed with two i32 values on a 32-bit 5781 // machine. 5782 RegVT = EVT::getIntegerVT(Context, 5783 OpInfo.ConstraintVT.getSizeInBits()); 5784 OpInfo.CallOperand = DAG.getNode(ISD::BITCAST, DL, 5785 RegVT, OpInfo.CallOperand); 5786 OpInfo.ConstraintVT = RegVT; 5787 } 5788 } 5789 5790 NumRegs = TLI.getNumRegisters(Context, OpInfo.ConstraintVT); 5791 } 5792 5793 EVT RegVT; 5794 EVT ValueVT = OpInfo.ConstraintVT; 5795 5796 // If this is a constraint for a specific physical register, like {r17}, 5797 // assign it now. 5798 if (unsigned AssignedReg = PhysReg.first) { 5799 const TargetRegisterClass *RC = PhysReg.second; 5800 if (OpInfo.ConstraintVT == MVT::Other) 5801 ValueVT = *RC->vt_begin(); 5802 5803 // Get the actual register value type. This is important, because the user 5804 // may have asked for (e.g.) the AX register in i32 type. We need to 5805 // remember that AX is actually i16 to get the right extension. 5806 RegVT = *RC->vt_begin(); 5807 5808 // This is a explicit reference to a physical register. 5809 Regs.push_back(AssignedReg); 5810 5811 // If this is an expanded reference, add the rest of the regs to Regs. 5812 if (NumRegs != 1) { 5813 TargetRegisterClass::iterator I = RC->begin(); 5814 for (; *I != AssignedReg; ++I) 5815 assert(I != RC->end() && "Didn't find reg!"); 5816 5817 // Already added the first reg. 5818 --NumRegs; ++I; 5819 for (; NumRegs; --NumRegs, ++I) { 5820 assert(I != RC->end() && "Ran out of registers to allocate!"); 5821 Regs.push_back(*I); 5822 } 5823 } 5824 5825 OpInfo.AssignedRegs = RegsForValue(Regs, RegVT, ValueVT); 5826 return; 5827 } 5828 5829 // Otherwise, if this was a reference to an LLVM register class, create vregs 5830 // for this reference. 5831 if (const TargetRegisterClass *RC = PhysReg.second) { 5832 RegVT = *RC->vt_begin(); 5833 if (OpInfo.ConstraintVT == MVT::Other) 5834 ValueVT = RegVT; 5835 5836 // Create the appropriate number of virtual registers. 5837 MachineRegisterInfo &RegInfo = MF.getRegInfo(); 5838 for (; NumRegs; --NumRegs) 5839 Regs.push_back(RegInfo.createVirtualRegister(RC)); 5840 5841 OpInfo.AssignedRegs = RegsForValue(Regs, RegVT, ValueVT); 5842 return; 5843 } 5844 5845 // Otherwise, we couldn't allocate enough registers for this. 5846} 5847 5848/// visitInlineAsm - Handle a call to an InlineAsm object. 5849/// 5850void SelectionDAGBuilder::visitInlineAsm(ImmutableCallSite CS) { 5851 const InlineAsm *IA = cast<InlineAsm>(CS.getCalledValue()); 5852 5853 /// ConstraintOperands - Information about all of the constraints. 5854 SDISelAsmOperandInfoVector ConstraintOperands; 5855 5856 TargetLowering::AsmOperandInfoVector 5857 TargetConstraints = TLI.ParseConstraints(CS); 5858 5859 bool hasMemory = false; 5860 5861 unsigned ArgNo = 0; // ArgNo - The argument of the CallInst. 5862 unsigned ResNo = 0; // ResNo - The result number of the next output. 5863 for (unsigned i = 0, e = TargetConstraints.size(); i != e; ++i) { 5864 ConstraintOperands.push_back(SDISelAsmOperandInfo(TargetConstraints[i])); 5865 SDISelAsmOperandInfo &OpInfo = ConstraintOperands.back(); 5866 5867 EVT OpVT = MVT::Other; 5868 5869 // Compute the value type for each operand. 5870 switch (OpInfo.Type) { 5871 case InlineAsm::isOutput: 5872 // Indirect outputs just consume an argument. 5873 if (OpInfo.isIndirect) { 5874 OpInfo.CallOperandVal = const_cast<Value *>(CS.getArgument(ArgNo++)); 5875 break; 5876 } 5877 5878 // The return value of the call is this value. As such, there is no 5879 // corresponding argument. 5880 assert(!CS.getType()->isVoidTy() && "Bad inline asm!"); 5881 if (StructType *STy = dyn_cast<StructType>(CS.getType())) { 5882 OpVT = TLI.getValueType(STy->getElementType(ResNo)); 5883 } else { 5884 assert(ResNo == 0 && "Asm only has one result!"); 5885 OpVT = TLI.getValueType(CS.getType()); 5886 } 5887 ++ResNo; 5888 break; 5889 case InlineAsm::isInput: 5890 OpInfo.CallOperandVal = const_cast<Value *>(CS.getArgument(ArgNo++)); 5891 break; 5892 case InlineAsm::isClobber: 5893 // Nothing to do. 5894 break; 5895 } 5896 5897 // If this is an input or an indirect output, process the call argument. 5898 // BasicBlocks are labels, currently appearing only in asm's. 5899 if (OpInfo.CallOperandVal) { 5900 if (const BasicBlock *BB = dyn_cast<BasicBlock>(OpInfo.CallOperandVal)) { 5901 OpInfo.CallOperand = DAG.getBasicBlock(FuncInfo.MBBMap[BB]); 5902 } else { 5903 OpInfo.CallOperand = getValue(OpInfo.CallOperandVal); 5904 } 5905 5906 OpVT = OpInfo.getCallOperandValEVT(*DAG.getContext(), TLI, TD); 5907 } 5908 5909 OpInfo.ConstraintVT = OpVT; 5910 5911 // Indirect operand accesses access memory. 5912 if (OpInfo.isIndirect) 5913 hasMemory = true; 5914 else { 5915 for (unsigned j = 0, ee = OpInfo.Codes.size(); j != ee; ++j) { 5916 TargetLowering::ConstraintType 5917 CType = TLI.getConstraintType(OpInfo.Codes[j]); 5918 if (CType == TargetLowering::C_Memory) { 5919 hasMemory = true; 5920 break; 5921 } 5922 } 5923 } 5924 } 5925 5926 SDValue Chain, Flag; 5927 5928 // We won't need to flush pending loads if this asm doesn't touch 5929 // memory and is nonvolatile. 5930 if (hasMemory || IA->hasSideEffects()) 5931 Chain = getRoot(); 5932 else 5933 Chain = DAG.getRoot(); 5934 5935 // Second pass over the constraints: compute which constraint option to use 5936 // and assign registers to constraints that want a specific physreg. 5937 for (unsigned i = 0, e = ConstraintOperands.size(); i != e; ++i) { 5938 SDISelAsmOperandInfo &OpInfo = ConstraintOperands[i]; 5939 5940 // If this is an output operand with a matching input operand, look up the 5941 // matching input. If their types mismatch, e.g. one is an integer, the 5942 // other is floating point, or their sizes are different, flag it as an 5943 // error. 5944 if (OpInfo.hasMatchingInput()) { 5945 SDISelAsmOperandInfo &Input = ConstraintOperands[OpInfo.MatchingInput]; 5946 5947 if (OpInfo.ConstraintVT != Input.ConstraintVT) { 5948 std::pair<unsigned, const TargetRegisterClass*> MatchRC = 5949 TLI.getRegForInlineAsmConstraint(OpInfo.ConstraintCode, 5950 OpInfo.ConstraintVT); 5951 std::pair<unsigned, const TargetRegisterClass*> InputRC = 5952 TLI.getRegForInlineAsmConstraint(Input.ConstraintCode, 5953 Input.ConstraintVT); 5954 if ((OpInfo.ConstraintVT.isInteger() != 5955 Input.ConstraintVT.isInteger()) || 5956 (MatchRC.second != InputRC.second)) { 5957 report_fatal_error("Unsupported asm: input constraint" 5958 " with a matching output constraint of" 5959 " incompatible type!"); 5960 } 5961 Input.ConstraintVT = OpInfo.ConstraintVT; 5962 } 5963 } 5964 5965 // Compute the constraint code and ConstraintType to use. 5966 TLI.ComputeConstraintToUse(OpInfo, OpInfo.CallOperand, &DAG); 5967 5968 // If this is a memory input, and if the operand is not indirect, do what we 5969 // need to to provide an address for the memory input. 5970 if (OpInfo.ConstraintType == TargetLowering::C_Memory && 5971 !OpInfo.isIndirect) { 5972 assert((OpInfo.isMultipleAlternative || 5973 (OpInfo.Type == InlineAsm::isInput)) && 5974 "Can only indirectify direct input operands!"); 5975 5976 // Memory operands really want the address of the value. If we don't have 5977 // an indirect input, put it in the constpool if we can, otherwise spill 5978 // it to a stack slot. 5979 // TODO: This isn't quite right. We need to handle these according to 5980 // the addressing mode that the constraint wants. Also, this may take 5981 // an additional register for the computation and we don't want that 5982 // either. 5983 5984 // If the operand is a float, integer, or vector constant, spill to a 5985 // constant pool entry to get its address. 5986 const Value *OpVal = OpInfo.CallOperandVal; 5987 if (isa<ConstantFP>(OpVal) || isa<ConstantInt>(OpVal) || 5988 isa<ConstantVector>(OpVal) || isa<ConstantDataVector>(OpVal)) { 5989 OpInfo.CallOperand = DAG.getConstantPool(cast<Constant>(OpVal), 5990 TLI.getPointerTy()); 5991 } else { 5992 // Otherwise, create a stack slot and emit a store to it before the 5993 // asm. 5994 Type *Ty = OpVal->getType(); 5995 uint64_t TySize = TLI.getTargetData()->getTypeAllocSize(Ty); 5996 unsigned Align = TLI.getTargetData()->getPrefTypeAlignment(Ty); 5997 MachineFunction &MF = DAG.getMachineFunction(); 5998 int SSFI = MF.getFrameInfo()->CreateStackObject(TySize, Align, false); 5999 SDValue StackSlot = DAG.getFrameIndex(SSFI, TLI.getPointerTy()); 6000 Chain = DAG.getStore(Chain, getCurDebugLoc(), 6001 OpInfo.CallOperand, StackSlot, 6002 MachinePointerInfo::getFixedStack(SSFI), 6003 false, false, 0); 6004 OpInfo.CallOperand = StackSlot; 6005 } 6006 6007 // There is no longer a Value* corresponding to this operand. 6008 OpInfo.CallOperandVal = 0; 6009 6010 // It is now an indirect operand. 6011 OpInfo.isIndirect = true; 6012 } 6013 6014 // If this constraint is for a specific register, allocate it before 6015 // anything else. 6016 if (OpInfo.ConstraintType == TargetLowering::C_Register) 6017 GetRegistersForValue(DAG, TLI, getCurDebugLoc(), OpInfo); 6018 } 6019 6020 // Second pass - Loop over all of the operands, assigning virtual or physregs 6021 // to register class operands. 6022 for (unsigned i = 0, e = ConstraintOperands.size(); i != e; ++i) { 6023 SDISelAsmOperandInfo &OpInfo = ConstraintOperands[i]; 6024 6025 // C_Register operands have already been allocated, Other/Memory don't need 6026 // to be. 6027 if (OpInfo.ConstraintType == TargetLowering::C_RegisterClass) 6028 GetRegistersForValue(DAG, TLI, getCurDebugLoc(), OpInfo); 6029 } 6030 6031 // AsmNodeOperands - The operands for the ISD::INLINEASM node. 6032 std::vector<SDValue> AsmNodeOperands; 6033 AsmNodeOperands.push_back(SDValue()); // reserve space for input chain 6034 AsmNodeOperands.push_back( 6035 DAG.getTargetExternalSymbol(IA->getAsmString().c_str(), 6036 TLI.getPointerTy())); 6037 6038 // If we have a !srcloc metadata node associated with it, we want to attach 6039 // this to the ultimately generated inline asm machineinstr. To do this, we 6040 // pass in the third operand as this (potentially null) inline asm MDNode. 6041 const MDNode *SrcLoc = CS.getInstruction()->getMetadata("srcloc"); 6042 AsmNodeOperands.push_back(DAG.getMDNode(SrcLoc)); 6043 6044 // Remember the HasSideEffect and AlignStack bits as operand 3. 6045 unsigned ExtraInfo = 0; 6046 if (IA->hasSideEffects()) 6047 ExtraInfo |= InlineAsm::Extra_HasSideEffects; 6048 if (IA->isAlignStack()) 6049 ExtraInfo |= InlineAsm::Extra_IsAlignStack; 6050 AsmNodeOperands.push_back(DAG.getTargetConstant(ExtraInfo, 6051 TLI.getPointerTy())); 6052 6053 // Loop over all of the inputs, copying the operand values into the 6054 // appropriate registers and processing the output regs. 6055 RegsForValue RetValRegs; 6056 6057 // IndirectStoresToEmit - The set of stores to emit after the inline asm node. 6058 std::vector<std::pair<RegsForValue, Value*> > IndirectStoresToEmit; 6059 6060 for (unsigned i = 0, e = ConstraintOperands.size(); i != e; ++i) { 6061 SDISelAsmOperandInfo &OpInfo = ConstraintOperands[i]; 6062 6063 switch (OpInfo.Type) { 6064 case InlineAsm::isOutput: { 6065 if (OpInfo.ConstraintType != TargetLowering::C_RegisterClass && 6066 OpInfo.ConstraintType != TargetLowering::C_Register) { 6067 // Memory output, or 'other' output (e.g. 'X' constraint). 6068 assert(OpInfo.isIndirect && "Memory output must be indirect operand"); 6069 6070 // Add information to the INLINEASM node to know about this output. 6071 unsigned OpFlags = InlineAsm::getFlagWord(InlineAsm::Kind_Mem, 1); 6072 AsmNodeOperands.push_back(DAG.getTargetConstant(OpFlags, 6073 TLI.getPointerTy())); 6074 AsmNodeOperands.push_back(OpInfo.CallOperand); 6075 break; 6076 } 6077 6078 // Otherwise, this is a register or register class output. 6079 6080 // Copy the output from the appropriate register. Find a register that 6081 // we can use. 6082 if (OpInfo.AssignedRegs.Regs.empty()) { 6083 LLVMContext &Ctx = *DAG.getContext(); 6084 Ctx.emitError(CS.getInstruction(), 6085 "couldn't allocate output register for constraint '" + 6086 Twine(OpInfo.ConstraintCode) + "'"); 6087 break; 6088 } 6089 6090 // If this is an indirect operand, store through the pointer after the 6091 // asm. 6092 if (OpInfo.isIndirect) { 6093 IndirectStoresToEmit.push_back(std::make_pair(OpInfo.AssignedRegs, 6094 OpInfo.CallOperandVal)); 6095 } else { 6096 // This is the result value of the call. 6097 assert(!CS.getType()->isVoidTy() && "Bad inline asm!"); 6098 // Concatenate this output onto the outputs list. 6099 RetValRegs.append(OpInfo.AssignedRegs); 6100 } 6101 6102 // Add information to the INLINEASM node to know that this register is 6103 // set. 6104 OpInfo.AssignedRegs.AddInlineAsmOperands(OpInfo.isEarlyClobber ? 6105 InlineAsm::Kind_RegDefEarlyClobber : 6106 InlineAsm::Kind_RegDef, 6107 false, 6108 0, 6109 DAG, 6110 AsmNodeOperands); 6111 break; 6112 } 6113 case InlineAsm::isInput: { 6114 SDValue InOperandVal = OpInfo.CallOperand; 6115 6116 if (OpInfo.isMatchingInputConstraint()) { // Matching constraint? 6117 // If this is required to match an output register we have already set, 6118 // just use its register. 6119 unsigned OperandNo = OpInfo.getMatchedOperand(); 6120 6121 // Scan until we find the definition we already emitted of this operand. 6122 // When we find it, create a RegsForValue operand. 6123 unsigned CurOp = InlineAsm::Op_FirstOperand; 6124 for (; OperandNo; --OperandNo) { 6125 // Advance to the next operand. 6126 unsigned OpFlag = 6127 cast<ConstantSDNode>(AsmNodeOperands[CurOp])->getZExtValue(); 6128 assert((InlineAsm::isRegDefKind(OpFlag) || 6129 InlineAsm::isRegDefEarlyClobberKind(OpFlag) || 6130 InlineAsm::isMemKind(OpFlag)) && "Skipped past definitions?"); 6131 CurOp += InlineAsm::getNumOperandRegisters(OpFlag)+1; 6132 } 6133 6134 unsigned OpFlag = 6135 cast<ConstantSDNode>(AsmNodeOperands[CurOp])->getZExtValue(); 6136 if (InlineAsm::isRegDefKind(OpFlag) || 6137 InlineAsm::isRegDefEarlyClobberKind(OpFlag)) { 6138 // Add (OpFlag&0xffff)>>3 registers to MatchedRegs. 6139 if (OpInfo.isIndirect) { 6140 // This happens on gcc/testsuite/gcc.dg/pr8788-1.c 6141 LLVMContext &Ctx = *DAG.getContext(); 6142 Ctx.emitError(CS.getInstruction(), "inline asm not supported yet:" 6143 " don't know how to handle tied " 6144 "indirect register inputs"); 6145 } 6146 6147 RegsForValue MatchedRegs; 6148 MatchedRegs.ValueVTs.push_back(InOperandVal.getValueType()); 6149 EVT RegVT = AsmNodeOperands[CurOp+1].getValueType(); 6150 MatchedRegs.RegVTs.push_back(RegVT); 6151 MachineRegisterInfo &RegInfo = DAG.getMachineFunction().getRegInfo(); 6152 for (unsigned i = 0, e = InlineAsm::getNumOperandRegisters(OpFlag); 6153 i != e; ++i) 6154 MatchedRegs.Regs.push_back 6155 (RegInfo.createVirtualRegister(TLI.getRegClassFor(RegVT))); 6156 6157 // Use the produced MatchedRegs object to 6158 MatchedRegs.getCopyToRegs(InOperandVal, DAG, getCurDebugLoc(), 6159 Chain, &Flag); 6160 MatchedRegs.AddInlineAsmOperands(InlineAsm::Kind_RegUse, 6161 true, OpInfo.getMatchedOperand(), 6162 DAG, AsmNodeOperands); 6163 break; 6164 } 6165 6166 assert(InlineAsm::isMemKind(OpFlag) && "Unknown matching constraint!"); 6167 assert(InlineAsm::getNumOperandRegisters(OpFlag) == 1 && 6168 "Unexpected number of operands"); 6169 // Add information to the INLINEASM node to know about this input. 6170 // See InlineAsm.h isUseOperandTiedToDef. 6171 OpFlag = InlineAsm::getFlagWordForMatchingOp(OpFlag, 6172 OpInfo.getMatchedOperand()); 6173 AsmNodeOperands.push_back(DAG.getTargetConstant(OpFlag, 6174 TLI.getPointerTy())); 6175 AsmNodeOperands.push_back(AsmNodeOperands[CurOp+1]); 6176 break; 6177 } 6178 6179 // Treat indirect 'X' constraint as memory. 6180 if (OpInfo.ConstraintType == TargetLowering::C_Other && 6181 OpInfo.isIndirect) 6182 OpInfo.ConstraintType = TargetLowering::C_Memory; 6183 6184 if (OpInfo.ConstraintType == TargetLowering::C_Other) { 6185 std::vector<SDValue> Ops; 6186 TLI.LowerAsmOperandForConstraint(InOperandVal, OpInfo.ConstraintCode, 6187 Ops, DAG); 6188 if (Ops.empty()) { 6189 LLVMContext &Ctx = *DAG.getContext(); 6190 Ctx.emitError(CS.getInstruction(), 6191 "invalid operand for inline asm constraint '" + 6192 Twine(OpInfo.ConstraintCode) + "'"); 6193 break; 6194 } 6195 6196 // Add information to the INLINEASM node to know about this input. 6197 unsigned ResOpType = 6198 InlineAsm::getFlagWord(InlineAsm::Kind_Imm, Ops.size()); 6199 AsmNodeOperands.push_back(DAG.getTargetConstant(ResOpType, 6200 TLI.getPointerTy())); 6201 AsmNodeOperands.insert(AsmNodeOperands.end(), Ops.begin(), Ops.end()); 6202 break; 6203 } 6204 6205 if (OpInfo.ConstraintType == TargetLowering::C_Memory) { 6206 assert(OpInfo.isIndirect && "Operand must be indirect to be a mem!"); 6207 assert(InOperandVal.getValueType() == TLI.getPointerTy() && 6208 "Memory operands expect pointer values"); 6209 6210 // Add information to the INLINEASM node to know about this input. 6211 unsigned ResOpType = InlineAsm::getFlagWord(InlineAsm::Kind_Mem, 1); 6212 AsmNodeOperands.push_back(DAG.getTargetConstant(ResOpType, 6213 TLI.getPointerTy())); 6214 AsmNodeOperands.push_back(InOperandVal); 6215 break; 6216 } 6217 6218 assert((OpInfo.ConstraintType == TargetLowering::C_RegisterClass || 6219 OpInfo.ConstraintType == TargetLowering::C_Register) && 6220 "Unknown constraint type!"); 6221 assert(!OpInfo.isIndirect && 6222 "Don't know how to handle indirect register inputs yet!"); 6223 6224 // Copy the input into the appropriate registers. 6225 if (OpInfo.AssignedRegs.Regs.empty()) { 6226 LLVMContext &Ctx = *DAG.getContext(); 6227 Ctx.emitError(CS.getInstruction(), 6228 "couldn't allocate input reg for constraint '" + 6229 Twine(OpInfo.ConstraintCode) + "'"); 6230 break; 6231 } 6232 6233 OpInfo.AssignedRegs.getCopyToRegs(InOperandVal, DAG, getCurDebugLoc(), 6234 Chain, &Flag); 6235 6236 OpInfo.AssignedRegs.AddInlineAsmOperands(InlineAsm::Kind_RegUse, false, 0, 6237 DAG, AsmNodeOperands); 6238 break; 6239 } 6240 case InlineAsm::isClobber: { 6241 // Add the clobbered value to the operand list, so that the register 6242 // allocator is aware that the physreg got clobbered. 6243 if (!OpInfo.AssignedRegs.Regs.empty()) 6244 OpInfo.AssignedRegs.AddInlineAsmOperands(InlineAsm::Kind_Clobber, 6245 false, 0, DAG, 6246 AsmNodeOperands); 6247 break; 6248 } 6249 } 6250 } 6251 6252 // Finish up input operands. Set the input chain and add the flag last. 6253 AsmNodeOperands[InlineAsm::Op_InputChain] = Chain; 6254 if (Flag.getNode()) AsmNodeOperands.push_back(Flag); 6255 6256 Chain = DAG.getNode(ISD::INLINEASM, getCurDebugLoc(), 6257 DAG.getVTList(MVT::Other, MVT::Glue), 6258 &AsmNodeOperands[0], AsmNodeOperands.size()); 6259 Flag = Chain.getValue(1); 6260 6261 // If this asm returns a register value, copy the result from that register 6262 // and set it as the value of the call. 6263 if (!RetValRegs.Regs.empty()) { 6264 SDValue Val = RetValRegs.getCopyFromRegs(DAG, FuncInfo, getCurDebugLoc(), 6265 Chain, &Flag); 6266 6267 // FIXME: Why don't we do this for inline asms with MRVs? 6268 if (CS.getType()->isSingleValueType() && CS.getType()->isSized()) { 6269 EVT ResultType = TLI.getValueType(CS.getType()); 6270 6271 // If any of the results of the inline asm is a vector, it may have the 6272 // wrong width/num elts. This can happen for register classes that can 6273 // contain multiple different value types. The preg or vreg allocated may 6274 // not have the same VT as was expected. Convert it to the right type 6275 // with bit_convert. 6276 if (ResultType != Val.getValueType() && Val.getValueType().isVector()) { 6277 Val = DAG.getNode(ISD::BITCAST, getCurDebugLoc(), 6278 ResultType, Val); 6279 6280 } else if (ResultType != Val.getValueType() && 6281 ResultType.isInteger() && Val.getValueType().isInteger()) { 6282 // If a result value was tied to an input value, the computed result may 6283 // have a wider width than the expected result. Extract the relevant 6284 // portion. 6285 Val = DAG.getNode(ISD::TRUNCATE, getCurDebugLoc(), ResultType, Val); 6286 } 6287 6288 assert(ResultType == Val.getValueType() && "Asm result value mismatch!"); 6289 } 6290 6291 setValue(CS.getInstruction(), Val); 6292 // Don't need to use this as a chain in this case. 6293 if (!IA->hasSideEffects() && !hasMemory && IndirectStoresToEmit.empty()) 6294 return; 6295 } 6296 6297 std::vector<std::pair<SDValue, const Value *> > StoresToEmit; 6298 6299 // Process indirect outputs, first output all of the flagged copies out of 6300 // physregs. 6301 for (unsigned i = 0, e = IndirectStoresToEmit.size(); i != e; ++i) { 6302 RegsForValue &OutRegs = IndirectStoresToEmit[i].first; 6303 const Value *Ptr = IndirectStoresToEmit[i].second; 6304 SDValue OutVal = OutRegs.getCopyFromRegs(DAG, FuncInfo, getCurDebugLoc(), 6305 Chain, &Flag); 6306 StoresToEmit.push_back(std::make_pair(OutVal, Ptr)); 6307 } 6308 6309 // Emit the non-flagged stores from the physregs. 6310 SmallVector<SDValue, 8> OutChains; 6311 for (unsigned i = 0, e = StoresToEmit.size(); i != e; ++i) { 6312 SDValue Val = DAG.getStore(Chain, getCurDebugLoc(), 6313 StoresToEmit[i].first, 6314 getValue(StoresToEmit[i].second), 6315 MachinePointerInfo(StoresToEmit[i].second), 6316 false, false, 0); 6317 OutChains.push_back(Val); 6318 } 6319 6320 if (!OutChains.empty()) 6321 Chain = DAG.getNode(ISD::TokenFactor, getCurDebugLoc(), MVT::Other, 6322 &OutChains[0], OutChains.size()); 6323 6324 DAG.setRoot(Chain); 6325} 6326 6327void SelectionDAGBuilder::visitVAStart(const CallInst &I) { 6328 DAG.setRoot(DAG.getNode(ISD::VASTART, getCurDebugLoc(), 6329 MVT::Other, getRoot(), 6330 getValue(I.getArgOperand(0)), 6331 DAG.getSrcValue(I.getArgOperand(0)))); 6332} 6333 6334void SelectionDAGBuilder::visitVAArg(const VAArgInst &I) { 6335 const TargetData &TD = *TLI.getTargetData(); 6336 SDValue V = DAG.getVAArg(TLI.getValueType(I.getType()), getCurDebugLoc(), 6337 getRoot(), getValue(I.getOperand(0)), 6338 DAG.getSrcValue(I.getOperand(0)), 6339 TD.getABITypeAlignment(I.getType())); 6340 setValue(&I, V); 6341 DAG.setRoot(V.getValue(1)); 6342} 6343 6344void SelectionDAGBuilder::visitVAEnd(const CallInst &I) { 6345 DAG.setRoot(DAG.getNode(ISD::VAEND, getCurDebugLoc(), 6346 MVT::Other, getRoot(), 6347 getValue(I.getArgOperand(0)), 6348 DAG.getSrcValue(I.getArgOperand(0)))); 6349} 6350 6351void SelectionDAGBuilder::visitVACopy(const CallInst &I) { 6352 DAG.setRoot(DAG.getNode(ISD::VACOPY, getCurDebugLoc(), 6353 MVT::Other, getRoot(), 6354 getValue(I.getArgOperand(0)), 6355 getValue(I.getArgOperand(1)), 6356 DAG.getSrcValue(I.getArgOperand(0)), 6357 DAG.getSrcValue(I.getArgOperand(1)))); 6358} 6359 6360/// TargetLowering::LowerCallTo - This is the default LowerCallTo 6361/// implementation, which just calls LowerCall. 6362/// FIXME: When all targets are 6363/// migrated to using LowerCall, this hook should be integrated into SDISel. 6364std::pair<SDValue, SDValue> 6365TargetLowering::LowerCallTo(SDValue Chain, Type *RetTy, 6366 bool RetSExt, bool RetZExt, bool isVarArg, 6367 bool isInreg, unsigned NumFixedArgs, 6368 CallingConv::ID CallConv, bool isTailCall, 6369 bool doesNotRet, bool isReturnValueUsed, 6370 SDValue Callee, 6371 ArgListTy &Args, SelectionDAG &DAG, 6372 DebugLoc dl) const { 6373 // Handle all of the outgoing arguments. 6374 SmallVector<ISD::OutputArg, 32> Outs; 6375 SmallVector<SDValue, 32> OutVals; 6376 for (unsigned i = 0, e = Args.size(); i != e; ++i) { 6377 SmallVector<EVT, 4> ValueVTs; 6378 ComputeValueVTs(*this, Args[i].Ty, ValueVTs); 6379 for (unsigned Value = 0, NumValues = ValueVTs.size(); 6380 Value != NumValues; ++Value) { 6381 EVT VT = ValueVTs[Value]; 6382 Type *ArgTy = VT.getTypeForEVT(RetTy->getContext()); 6383 SDValue Op = SDValue(Args[i].Node.getNode(), 6384 Args[i].Node.getResNo() + Value); 6385 ISD::ArgFlagsTy Flags; 6386 unsigned OriginalAlignment = 6387 getTargetData()->getABITypeAlignment(ArgTy); 6388 6389 if (Args[i].isZExt) 6390 Flags.setZExt(); 6391 if (Args[i].isSExt) 6392 Flags.setSExt(); 6393 if (Args[i].isInReg) 6394 Flags.setInReg(); 6395 if (Args[i].isSRet) 6396 Flags.setSRet(); 6397 if (Args[i].isByVal) { 6398 Flags.setByVal(); 6399 PointerType *Ty = cast<PointerType>(Args[i].Ty); 6400 Type *ElementTy = Ty->getElementType(); 6401 Flags.setByValSize(getTargetData()->getTypeAllocSize(ElementTy)); 6402 // For ByVal, alignment should come from FE. BE will guess if this 6403 // info is not there but there are cases it cannot get right. 6404 unsigned FrameAlign; 6405 if (Args[i].Alignment) 6406 FrameAlign = Args[i].Alignment; 6407 else 6408 FrameAlign = getByValTypeAlignment(ElementTy); 6409 Flags.setByValAlign(FrameAlign); 6410 } 6411 if (Args[i].isNest) 6412 Flags.setNest(); 6413 Flags.setOrigAlign(OriginalAlignment); 6414 6415 EVT PartVT = getRegisterType(RetTy->getContext(), VT); 6416 unsigned NumParts = getNumRegisters(RetTy->getContext(), VT); 6417 SmallVector<SDValue, 4> Parts(NumParts); 6418 ISD::NodeType ExtendKind = ISD::ANY_EXTEND; 6419 6420 if (Args[i].isSExt) 6421 ExtendKind = ISD::SIGN_EXTEND; 6422 else if (Args[i].isZExt) 6423 ExtendKind = ISD::ZERO_EXTEND; 6424 6425 getCopyToParts(DAG, dl, Op, &Parts[0], NumParts, 6426 PartVT, ExtendKind); 6427 6428 for (unsigned j = 0; j != NumParts; ++j) { 6429 // if it isn't first piece, alignment must be 1 6430 ISD::OutputArg MyFlags(Flags, Parts[j].getValueType(), 6431 i < NumFixedArgs); 6432 if (NumParts > 1 && j == 0) 6433 MyFlags.Flags.setSplit(); 6434 else if (j != 0) 6435 MyFlags.Flags.setOrigAlign(1); 6436 6437 Outs.push_back(MyFlags); 6438 OutVals.push_back(Parts[j]); 6439 } 6440 } 6441 } 6442 6443 // Handle the incoming return values from the call. 6444 SmallVector<ISD::InputArg, 32> Ins; 6445 SmallVector<EVT, 4> RetTys; 6446 ComputeValueVTs(*this, RetTy, RetTys); 6447 for (unsigned I = 0, E = RetTys.size(); I != E; ++I) { 6448 EVT VT = RetTys[I]; 6449 EVT RegisterVT = getRegisterType(RetTy->getContext(), VT); 6450 unsigned NumRegs = getNumRegisters(RetTy->getContext(), VT); 6451 for (unsigned i = 0; i != NumRegs; ++i) { 6452 ISD::InputArg MyFlags; 6453 MyFlags.VT = RegisterVT.getSimpleVT(); 6454 MyFlags.Used = isReturnValueUsed; 6455 if (RetSExt) 6456 MyFlags.Flags.setSExt(); 6457 if (RetZExt) 6458 MyFlags.Flags.setZExt(); 6459 if (isInreg) 6460 MyFlags.Flags.setInReg(); 6461 Ins.push_back(MyFlags); 6462 } 6463 } 6464 6465 SmallVector<SDValue, 4> InVals; 6466 Chain = LowerCall(Chain, Callee, CallConv, isVarArg, doesNotRet, isTailCall, 6467 Outs, OutVals, Ins, dl, DAG, InVals); 6468 6469 // Verify that the target's LowerCall behaved as expected. 6470 assert(Chain.getNode() && Chain.getValueType() == MVT::Other && 6471 "LowerCall didn't return a valid chain!"); 6472 assert((!isTailCall || InVals.empty()) && 6473 "LowerCall emitted a return value for a tail call!"); 6474 assert((isTailCall || InVals.size() == Ins.size()) && 6475 "LowerCall didn't emit the correct number of values!"); 6476 6477 // For a tail call, the return value is merely live-out and there aren't 6478 // any nodes in the DAG representing it. Return a special value to 6479 // indicate that a tail call has been emitted and no more Instructions 6480 // should be processed in the current block. 6481 if (isTailCall) { 6482 DAG.setRoot(Chain); 6483 return std::make_pair(SDValue(), SDValue()); 6484 } 6485 6486 DEBUG(for (unsigned i = 0, e = Ins.size(); i != e; ++i) { 6487 assert(InVals[i].getNode() && 6488 "LowerCall emitted a null value!"); 6489 assert(EVT(Ins[i].VT) == InVals[i].getValueType() && 6490 "LowerCall emitted a value with the wrong type!"); 6491 }); 6492 6493 // Collect the legal value parts into potentially illegal values 6494 // that correspond to the original function's return values. 6495 ISD::NodeType AssertOp = ISD::DELETED_NODE; 6496 if (RetSExt) 6497 AssertOp = ISD::AssertSext; 6498 else if (RetZExt) 6499 AssertOp = ISD::AssertZext; 6500 SmallVector<SDValue, 4> ReturnValues; 6501 unsigned CurReg = 0; 6502 for (unsigned I = 0, E = RetTys.size(); I != E; ++I) { 6503 EVT VT = RetTys[I]; 6504 EVT RegisterVT = getRegisterType(RetTy->getContext(), VT); 6505 unsigned NumRegs = getNumRegisters(RetTy->getContext(), VT); 6506 6507 ReturnValues.push_back(getCopyFromParts(DAG, dl, &InVals[CurReg], 6508 NumRegs, RegisterVT, VT, 6509 AssertOp)); 6510 CurReg += NumRegs; 6511 } 6512 6513 // For a function returning void, there is no return value. We can't create 6514 // such a node, so we just return a null return value in that case. In 6515 // that case, nothing will actually look at the value. 6516 if (ReturnValues.empty()) 6517 return std::make_pair(SDValue(), Chain); 6518 6519 SDValue Res = DAG.getNode(ISD::MERGE_VALUES, dl, 6520 DAG.getVTList(&RetTys[0], RetTys.size()), 6521 &ReturnValues[0], ReturnValues.size()); 6522 return std::make_pair(Res, Chain); 6523} 6524 6525void TargetLowering::LowerOperationWrapper(SDNode *N, 6526 SmallVectorImpl<SDValue> &Results, 6527 SelectionDAG &DAG) const { 6528 SDValue Res = LowerOperation(SDValue(N, 0), DAG); 6529 if (Res.getNode()) 6530 Results.push_back(Res); 6531} 6532 6533SDValue TargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) const { 6534 llvm_unreachable("LowerOperation not implemented for this target!"); 6535} 6536 6537void 6538SelectionDAGBuilder::CopyValueToVirtualRegister(const Value *V, unsigned Reg) { 6539 SDValue Op = getNonRegisterValue(V); 6540 assert((Op.getOpcode() != ISD::CopyFromReg || 6541 cast<RegisterSDNode>(Op.getOperand(1))->getReg() != Reg) && 6542 "Copy from a reg to the same reg!"); 6543 assert(!TargetRegisterInfo::isPhysicalRegister(Reg) && "Is a physreg"); 6544 6545 RegsForValue RFV(V->getContext(), TLI, Reg, V->getType()); 6546 SDValue Chain = DAG.getEntryNode(); 6547 RFV.getCopyToRegs(Op, DAG, getCurDebugLoc(), Chain, 0); 6548 PendingExports.push_back(Chain); 6549} 6550 6551#include "llvm/CodeGen/SelectionDAGISel.h" 6552 6553/// isOnlyUsedInEntryBlock - If the specified argument is only used in the 6554/// entry block, return true. This includes arguments used by switches, since 6555/// the switch may expand into multiple basic blocks. 6556static bool isOnlyUsedInEntryBlock(const Argument *A, bool FastISel) { 6557 // With FastISel active, we may be splitting blocks, so force creation 6558 // of virtual registers for all non-dead arguments. 6559 if (FastISel) 6560 return A->use_empty(); 6561 6562 const BasicBlock *Entry = A->getParent()->begin(); 6563 for (Value::const_use_iterator UI = A->use_begin(), E = A->use_end(); 6564 UI != E; ++UI) { 6565 const User *U = *UI; 6566 if (cast<Instruction>(U)->getParent() != Entry || isa<SwitchInst>(U)) 6567 return false; // Use not in entry block. 6568 } 6569 return true; 6570} 6571 6572void SelectionDAGISel::LowerArguments(const BasicBlock *LLVMBB) { 6573 // If this is the entry block, emit arguments. 6574 const Function &F = *LLVMBB->getParent(); 6575 SelectionDAG &DAG = SDB->DAG; 6576 DebugLoc dl = SDB->getCurDebugLoc(); 6577 const TargetData *TD = TLI.getTargetData(); 6578 SmallVector<ISD::InputArg, 16> Ins; 6579 6580 // Check whether the function can return without sret-demotion. 6581 SmallVector<ISD::OutputArg, 4> Outs; 6582 GetReturnInfo(F.getReturnType(), F.getAttributes().getRetAttributes(), 6583 Outs, TLI); 6584 6585 if (!FuncInfo->CanLowerReturn) { 6586 // Put in an sret pointer parameter before all the other parameters. 6587 SmallVector<EVT, 1> ValueVTs; 6588 ComputeValueVTs(TLI, PointerType::getUnqual(F.getReturnType()), ValueVTs); 6589 6590 // NOTE: Assuming that a pointer will never break down to more than one VT 6591 // or one register. 6592 ISD::ArgFlagsTy Flags; 6593 Flags.setSRet(); 6594 EVT RegisterVT = TLI.getRegisterType(*DAG.getContext(), ValueVTs[0]); 6595 ISD::InputArg RetArg(Flags, RegisterVT, true); 6596 Ins.push_back(RetArg); 6597 } 6598 6599 // Set up the incoming argument description vector. 6600 unsigned Idx = 1; 6601 for (Function::const_arg_iterator I = F.arg_begin(), E = F.arg_end(); 6602 I != E; ++I, ++Idx) { 6603 SmallVector<EVT, 4> ValueVTs; 6604 ComputeValueVTs(TLI, I->getType(), ValueVTs); 6605 bool isArgValueUsed = !I->use_empty(); 6606 for (unsigned Value = 0, NumValues = ValueVTs.size(); 6607 Value != NumValues; ++Value) { 6608 EVT VT = ValueVTs[Value]; 6609 Type *ArgTy = VT.getTypeForEVT(*DAG.getContext()); 6610 ISD::ArgFlagsTy Flags; 6611 unsigned OriginalAlignment = 6612 TD->getABITypeAlignment(ArgTy); 6613 6614 if (F.paramHasAttr(Idx, Attribute::ZExt)) 6615 Flags.setZExt(); 6616 if (F.paramHasAttr(Idx, Attribute::SExt)) 6617 Flags.setSExt(); 6618 if (F.paramHasAttr(Idx, Attribute::InReg)) 6619 Flags.setInReg(); 6620 if (F.paramHasAttr(Idx, Attribute::StructRet)) 6621 Flags.setSRet(); 6622 if (F.paramHasAttr(Idx, Attribute::ByVal)) { 6623 Flags.setByVal(); 6624 PointerType *Ty = cast<PointerType>(I->getType()); 6625 Type *ElementTy = Ty->getElementType(); 6626 Flags.setByValSize(TD->getTypeAllocSize(ElementTy)); 6627 // For ByVal, alignment should be passed from FE. BE will guess if 6628 // this info is not there but there are cases it cannot get right. 6629 unsigned FrameAlign; 6630 if (F.getParamAlignment(Idx)) 6631 FrameAlign = F.getParamAlignment(Idx); 6632 else 6633 FrameAlign = TLI.getByValTypeAlignment(ElementTy); 6634 Flags.setByValAlign(FrameAlign); 6635 } 6636 if (F.paramHasAttr(Idx, Attribute::Nest)) 6637 Flags.setNest(); 6638 Flags.setOrigAlign(OriginalAlignment); 6639 6640 EVT RegisterVT = TLI.getRegisterType(*CurDAG->getContext(), VT); 6641 unsigned NumRegs = TLI.getNumRegisters(*CurDAG->getContext(), VT); 6642 for (unsigned i = 0; i != NumRegs; ++i) { 6643 ISD::InputArg MyFlags(Flags, RegisterVT, isArgValueUsed); 6644 if (NumRegs > 1 && i == 0) 6645 MyFlags.Flags.setSplit(); 6646 // if it isn't first piece, alignment must be 1 6647 else if (i > 0) 6648 MyFlags.Flags.setOrigAlign(1); 6649 Ins.push_back(MyFlags); 6650 } 6651 } 6652 } 6653 6654 // Call the target to set up the argument values. 6655 SmallVector<SDValue, 8> InVals; 6656 SDValue NewRoot = TLI.LowerFormalArguments(DAG.getRoot(), F.getCallingConv(), 6657 F.isVarArg(), Ins, 6658 dl, DAG, InVals); 6659 6660 // Verify that the target's LowerFormalArguments behaved as expected. 6661 assert(NewRoot.getNode() && NewRoot.getValueType() == MVT::Other && 6662 "LowerFormalArguments didn't return a valid chain!"); 6663 assert(InVals.size() == Ins.size() && 6664 "LowerFormalArguments didn't emit the correct number of values!"); 6665 DEBUG({ 6666 for (unsigned i = 0, e = Ins.size(); i != e; ++i) { 6667 assert(InVals[i].getNode() && 6668 "LowerFormalArguments emitted a null value!"); 6669 assert(EVT(Ins[i].VT) == InVals[i].getValueType() && 6670 "LowerFormalArguments emitted a value with the wrong type!"); 6671 } 6672 }); 6673 6674 // Update the DAG with the new chain value resulting from argument lowering. 6675 DAG.setRoot(NewRoot); 6676 6677 // Set up the argument values. 6678 unsigned i = 0; 6679 Idx = 1; 6680 if (!FuncInfo->CanLowerReturn) { 6681 // Create a virtual register for the sret pointer, and put in a copy 6682 // from the sret argument into it. 6683 SmallVector<EVT, 1> ValueVTs; 6684 ComputeValueVTs(TLI, PointerType::getUnqual(F.getReturnType()), ValueVTs); 6685 EVT VT = ValueVTs[0]; 6686 EVT RegVT = TLI.getRegisterType(*CurDAG->getContext(), VT); 6687 ISD::NodeType AssertOp = ISD::DELETED_NODE; 6688 SDValue ArgValue = getCopyFromParts(DAG, dl, &InVals[0], 1, 6689 RegVT, VT, AssertOp); 6690 6691 MachineFunction& MF = SDB->DAG.getMachineFunction(); 6692 MachineRegisterInfo& RegInfo = MF.getRegInfo(); 6693 unsigned SRetReg = RegInfo.createVirtualRegister(TLI.getRegClassFor(RegVT)); 6694 FuncInfo->DemoteRegister = SRetReg; 6695 NewRoot = SDB->DAG.getCopyToReg(NewRoot, SDB->getCurDebugLoc(), 6696 SRetReg, ArgValue); 6697 DAG.setRoot(NewRoot); 6698 6699 // i indexes lowered arguments. Bump it past the hidden sret argument. 6700 // Idx indexes LLVM arguments. Don't touch it. 6701 ++i; 6702 } 6703 6704 for (Function::const_arg_iterator I = F.arg_begin(), E = F.arg_end(); I != E; 6705 ++I, ++Idx) { 6706 SmallVector<SDValue, 4> ArgValues; 6707 SmallVector<EVT, 4> ValueVTs; 6708 ComputeValueVTs(TLI, I->getType(), ValueVTs); 6709 unsigned NumValues = ValueVTs.size(); 6710 6711 // If this argument is unused then remember its value. It is used to generate 6712 // debugging information. 6713 if (I->use_empty() && NumValues) 6714 SDB->setUnusedArgValue(I, InVals[i]); 6715 6716 for (unsigned Val = 0; Val != NumValues; ++Val) { 6717 EVT VT = ValueVTs[Val]; 6718 EVT PartVT = TLI.getRegisterType(*CurDAG->getContext(), VT); 6719 unsigned NumParts = TLI.getNumRegisters(*CurDAG->getContext(), VT); 6720 6721 if (!I->use_empty()) { 6722 ISD::NodeType AssertOp = ISD::DELETED_NODE; 6723 if (F.paramHasAttr(Idx, Attribute::SExt)) 6724 AssertOp = ISD::AssertSext; 6725 else if (F.paramHasAttr(Idx, Attribute::ZExt)) 6726 AssertOp = ISD::AssertZext; 6727 6728 ArgValues.push_back(getCopyFromParts(DAG, dl, &InVals[i], 6729 NumParts, PartVT, VT, 6730 AssertOp)); 6731 } 6732 6733 i += NumParts; 6734 } 6735 6736 // We don't need to do anything else for unused arguments. 6737 if (ArgValues.empty()) 6738 continue; 6739 6740 // Note down frame index. 6741 if (FrameIndexSDNode *FI = 6742 dyn_cast<FrameIndexSDNode>(ArgValues[0].getNode())) 6743 FuncInfo->setArgumentFrameIndex(I, FI->getIndex()); 6744 6745 SDValue Res = DAG.getMergeValues(&ArgValues[0], NumValues, 6746 SDB->getCurDebugLoc()); 6747 6748 SDB->setValue(I, Res); 6749 if (!TM.Options.EnableFastISel && Res.getOpcode() == ISD::BUILD_PAIR) { 6750 if (LoadSDNode *LNode = 6751 dyn_cast<LoadSDNode>(Res.getOperand(0).getNode())) 6752 if (FrameIndexSDNode *FI = 6753 dyn_cast<FrameIndexSDNode>(LNode->getBasePtr().getNode())) 6754 FuncInfo->setArgumentFrameIndex(I, FI->getIndex()); 6755 } 6756 6757 // If this argument is live outside of the entry block, insert a copy from 6758 // wherever we got it to the vreg that other BB's will reference it as. 6759 if (!TM.Options.EnableFastISel && Res.getOpcode() == ISD::CopyFromReg) { 6760 // If we can, though, try to skip creating an unnecessary vreg. 6761 // FIXME: This isn't very clean... it would be nice to make this more 6762 // general. It's also subtly incompatible with the hacks FastISel 6763 // uses with vregs. 6764 unsigned Reg = cast<RegisterSDNode>(Res.getOperand(1))->getReg(); 6765 if (TargetRegisterInfo::isVirtualRegister(Reg)) { 6766 FuncInfo->ValueMap[I] = Reg; 6767 continue; 6768 } 6769 } 6770 if (!isOnlyUsedInEntryBlock(I, TM.Options.EnableFastISel)) { 6771 FuncInfo->InitializeRegForValue(I); 6772 SDB->CopyToExportRegsIfNeeded(I); 6773 } 6774 } 6775 6776 assert(i == InVals.size() && "Argument register count mismatch!"); 6777 6778 // Finally, if the target has anything special to do, allow it to do so. 6779 // FIXME: this should insert code into the DAG! 6780 EmitFunctionEntryCode(); 6781} 6782 6783/// Handle PHI nodes in successor blocks. Emit code into the SelectionDAG to 6784/// ensure constants are generated when needed. Remember the virtual registers 6785/// that need to be added to the Machine PHI nodes as input. We cannot just 6786/// directly add them, because expansion might result in multiple MBB's for one 6787/// BB. As such, the start of the BB might correspond to a different MBB than 6788/// the end. 6789/// 6790void 6791SelectionDAGBuilder::HandlePHINodesInSuccessorBlocks(const BasicBlock *LLVMBB) { 6792 const TerminatorInst *TI = LLVMBB->getTerminator(); 6793 6794 SmallPtrSet<MachineBasicBlock *, 4> SuccsHandled; 6795 6796 // Check successor nodes' PHI nodes that expect a constant to be available 6797 // from this block. 6798 for (unsigned succ = 0, e = TI->getNumSuccessors(); succ != e; ++succ) { 6799 const BasicBlock *SuccBB = TI->getSuccessor(succ); 6800 if (!isa<PHINode>(SuccBB->begin())) continue; 6801 MachineBasicBlock *SuccMBB = FuncInfo.MBBMap[SuccBB]; 6802 6803 // If this terminator has multiple identical successors (common for 6804 // switches), only handle each succ once. 6805 if (!SuccsHandled.insert(SuccMBB)) continue; 6806 6807 MachineBasicBlock::iterator MBBI = SuccMBB->begin(); 6808 6809 // At this point we know that there is a 1-1 correspondence between LLVM PHI 6810 // nodes and Machine PHI nodes, but the incoming operands have not been 6811 // emitted yet. 6812 for (BasicBlock::const_iterator I = SuccBB->begin(); 6813 const PHINode *PN = dyn_cast<PHINode>(I); ++I) { 6814 // Ignore dead phi's. 6815 if (PN->use_empty()) continue; 6816 6817 // Skip empty types 6818 if (PN->getType()->isEmptyTy()) 6819 continue; 6820 6821 unsigned Reg; 6822 const Value *PHIOp = PN->getIncomingValueForBlock(LLVMBB); 6823 6824 if (const Constant *C = dyn_cast<Constant>(PHIOp)) { 6825 unsigned &RegOut = ConstantsOut[C]; 6826 if (RegOut == 0) { 6827 RegOut = FuncInfo.CreateRegs(C->getType()); 6828 CopyValueToVirtualRegister(C, RegOut); 6829 } 6830 Reg = RegOut; 6831 } else { 6832 DenseMap<const Value *, unsigned>::iterator I = 6833 FuncInfo.ValueMap.find(PHIOp); 6834 if (I != FuncInfo.ValueMap.end()) 6835 Reg = I->second; 6836 else { 6837 assert(isa<AllocaInst>(PHIOp) && 6838 FuncInfo.StaticAllocaMap.count(cast<AllocaInst>(PHIOp)) && 6839 "Didn't codegen value into a register!??"); 6840 Reg = FuncInfo.CreateRegs(PHIOp->getType()); 6841 CopyValueToVirtualRegister(PHIOp, Reg); 6842 } 6843 } 6844 6845 // Remember that this register needs to added to the machine PHI node as 6846 // the input for this MBB. 6847 SmallVector<EVT, 4> ValueVTs; 6848 ComputeValueVTs(TLI, PN->getType(), ValueVTs); 6849 for (unsigned vti = 0, vte = ValueVTs.size(); vti != vte; ++vti) { 6850 EVT VT = ValueVTs[vti]; 6851 unsigned NumRegisters = TLI.getNumRegisters(*DAG.getContext(), VT); 6852 for (unsigned i = 0, e = NumRegisters; i != e; ++i) 6853 FuncInfo.PHINodesToUpdate.push_back(std::make_pair(MBBI++, Reg+i)); 6854 Reg += NumRegisters; 6855 } 6856 } 6857 } 6858 ConstantsOut.clear(); 6859} 6860