SelectionDAG.cpp revision ece6c6bb6329748b92403c06ac87f45c43485911
1//===-- SelectionDAG.cpp - Implement the SelectionDAG data structures -----===// 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 the SelectionDAG class. 11// 12//===----------------------------------------------------------------------===// 13 14#include "llvm/CodeGen/SelectionDAG.h" 15#include "SDNodeOrdering.h" 16#include "SDNodeDbgValue.h" 17#include "llvm/CallingConv.h" 18#include "llvm/Constants.h" 19#include "llvm/DebugInfo.h" 20#include "llvm/DerivedTypes.h" 21#include "llvm/Function.h" 22#include "llvm/GlobalAlias.h" 23#include "llvm/GlobalVariable.h" 24#include "llvm/Intrinsics.h" 25#include "llvm/Analysis/ValueTracking.h" 26#include "llvm/Assembly/Writer.h" 27#include "llvm/CodeGen/MachineBasicBlock.h" 28#include "llvm/CodeGen/MachineConstantPool.h" 29#include "llvm/CodeGen/MachineFrameInfo.h" 30#include "llvm/CodeGen/MachineModuleInfo.h" 31#include "llvm/Target/TargetRegisterInfo.h" 32#include "llvm/DataLayout.h" 33#include "llvm/Target/TargetLowering.h" 34#include "llvm/Target/TargetSelectionDAGInfo.h" 35#include "llvm/Target/TargetOptions.h" 36#include "llvm/Target/TargetInstrInfo.h" 37#include "llvm/Target/TargetIntrinsicInfo.h" 38#include "llvm/Target/TargetMachine.h" 39#include "llvm/Support/CommandLine.h" 40#include "llvm/Support/Debug.h" 41#include "llvm/Support/ErrorHandling.h" 42#include "llvm/Support/ManagedStatic.h" 43#include "llvm/Support/MathExtras.h" 44#include "llvm/Support/raw_ostream.h" 45#include "llvm/Support/Mutex.h" 46#include "llvm/ADT/SetVector.h" 47#include "llvm/ADT/SmallPtrSet.h" 48#include "llvm/ADT/SmallSet.h" 49#include "llvm/ADT/SmallVector.h" 50#include "llvm/ADT/StringExtras.h" 51#include <algorithm> 52#include <cmath> 53using namespace llvm; 54 55/// makeVTList - Return an instance of the SDVTList struct initialized with the 56/// specified members. 57static SDVTList makeVTList(const EVT *VTs, unsigned NumVTs) { 58 SDVTList Res = {VTs, NumVTs}; 59 return Res; 60} 61 62static const fltSemantics *EVTToAPFloatSemantics(EVT VT) { 63 switch (VT.getSimpleVT().SimpleTy) { 64 default: llvm_unreachable("Unknown FP format"); 65 case MVT::f16: return &APFloat::IEEEhalf; 66 case MVT::f32: return &APFloat::IEEEsingle; 67 case MVT::f64: return &APFloat::IEEEdouble; 68 case MVT::f80: return &APFloat::x87DoubleExtended; 69 case MVT::f128: return &APFloat::IEEEquad; 70 case MVT::ppcf128: return &APFloat::PPCDoubleDouble; 71 } 72} 73 74// Default null implementations of the callbacks. 75void SelectionDAG::DAGUpdateListener::NodeDeleted(SDNode*, SDNode*) {} 76void SelectionDAG::DAGUpdateListener::NodeUpdated(SDNode*) {} 77 78//===----------------------------------------------------------------------===// 79// ConstantFPSDNode Class 80//===----------------------------------------------------------------------===// 81 82/// isExactlyValue - We don't rely on operator== working on double values, as 83/// it returns true for things that are clearly not equal, like -0.0 and 0.0. 84/// As such, this method can be used to do an exact bit-for-bit comparison of 85/// two floating point values. 86bool ConstantFPSDNode::isExactlyValue(const APFloat& V) const { 87 return getValueAPF().bitwiseIsEqual(V); 88} 89 90bool ConstantFPSDNode::isValueValidForType(EVT VT, 91 const APFloat& Val) { 92 assert(VT.isFloatingPoint() && "Can only convert between FP types"); 93 94 // convert modifies in place, so make a copy. 95 APFloat Val2 = APFloat(Val); 96 bool losesInfo; 97 (void) Val2.convert(*EVTToAPFloatSemantics(VT), APFloat::rmNearestTiesToEven, 98 &losesInfo); 99 return !losesInfo; 100} 101 102//===----------------------------------------------------------------------===// 103// ISD Namespace 104//===----------------------------------------------------------------------===// 105 106/// isBuildVectorAllOnes - Return true if the specified node is a 107/// BUILD_VECTOR where all of the elements are ~0 or undef. 108bool ISD::isBuildVectorAllOnes(const SDNode *N) { 109 // Look through a bit convert. 110 if (N->getOpcode() == ISD::BITCAST) 111 N = N->getOperand(0).getNode(); 112 113 if (N->getOpcode() != ISD::BUILD_VECTOR) return false; 114 115 unsigned i = 0, e = N->getNumOperands(); 116 117 // Skip over all of the undef values. 118 while (i != e && N->getOperand(i).getOpcode() == ISD::UNDEF) 119 ++i; 120 121 // Do not accept an all-undef vector. 122 if (i == e) return false; 123 124 // Do not accept build_vectors that aren't all constants or which have non-~0 125 // elements. We have to be a bit careful here, as the type of the constant 126 // may not be the same as the type of the vector elements due to type 127 // legalization (the elements are promoted to a legal type for the target and 128 // a vector of a type may be legal when the base element type is not). 129 // We only want to check enough bits to cover the vector elements, because 130 // we care if the resultant vector is all ones, not whether the individual 131 // constants are. 132 SDValue NotZero = N->getOperand(i); 133 unsigned EltSize = N->getValueType(0).getVectorElementType().getSizeInBits(); 134 if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(NotZero)) { 135 if (CN->getAPIntValue().countTrailingOnes() < EltSize) 136 return false; 137 } else if (ConstantFPSDNode *CFPN = dyn_cast<ConstantFPSDNode>(NotZero)) { 138 if (CFPN->getValueAPF().bitcastToAPInt().countTrailingOnes() < EltSize) 139 return false; 140 } else 141 return false; 142 143 // Okay, we have at least one ~0 value, check to see if the rest match or are 144 // undefs. Even with the above element type twiddling, this should be OK, as 145 // the same type legalization should have applied to all the elements. 146 for (++i; i != e; ++i) 147 if (N->getOperand(i) != NotZero && 148 N->getOperand(i).getOpcode() != ISD::UNDEF) 149 return false; 150 return true; 151} 152 153 154/// isBuildVectorAllZeros - Return true if the specified node is a 155/// BUILD_VECTOR where all of the elements are 0 or undef. 156bool ISD::isBuildVectorAllZeros(const SDNode *N) { 157 // Look through a bit convert. 158 if (N->getOpcode() == ISD::BITCAST) 159 N = N->getOperand(0).getNode(); 160 161 if (N->getOpcode() != ISD::BUILD_VECTOR) return false; 162 163 unsigned i = 0, e = N->getNumOperands(); 164 165 // Skip over all of the undef values. 166 while (i != e && N->getOperand(i).getOpcode() == ISD::UNDEF) 167 ++i; 168 169 // Do not accept an all-undef vector. 170 if (i == e) return false; 171 172 // Do not accept build_vectors that aren't all constants or which have non-0 173 // elements. 174 SDValue Zero = N->getOperand(i); 175 if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(Zero)) { 176 if (!CN->isNullValue()) 177 return false; 178 } else if (ConstantFPSDNode *CFPN = dyn_cast<ConstantFPSDNode>(Zero)) { 179 if (!CFPN->getValueAPF().isPosZero()) 180 return false; 181 } else 182 return false; 183 184 // Okay, we have at least one 0 value, check to see if the rest match or are 185 // undefs. 186 for (++i; i != e; ++i) 187 if (N->getOperand(i) != Zero && 188 N->getOperand(i).getOpcode() != ISD::UNDEF) 189 return false; 190 return true; 191} 192 193/// isScalarToVector - Return true if the specified node is a 194/// ISD::SCALAR_TO_VECTOR node or a BUILD_VECTOR node where only the low 195/// element is not an undef. 196bool ISD::isScalarToVector(const SDNode *N) { 197 if (N->getOpcode() == ISD::SCALAR_TO_VECTOR) 198 return true; 199 200 if (N->getOpcode() != ISD::BUILD_VECTOR) 201 return false; 202 if (N->getOperand(0).getOpcode() == ISD::UNDEF) 203 return false; 204 unsigned NumElems = N->getNumOperands(); 205 if (NumElems == 1) 206 return false; 207 for (unsigned i = 1; i < NumElems; ++i) { 208 SDValue V = N->getOperand(i); 209 if (V.getOpcode() != ISD::UNDEF) 210 return false; 211 } 212 return true; 213} 214 215/// allOperandsUndef - Return true if the node has at least one operand 216/// and all operands of the specified node are ISD::UNDEF. 217bool ISD::allOperandsUndef(const SDNode *N) { 218 // Return false if the node has no operands. 219 // This is "logically inconsistent" with the definition of "all" but 220 // is probably the desired behavior. 221 if (N->getNumOperands() == 0) 222 return false; 223 224 for (unsigned i = 0, e = N->getNumOperands(); i != e ; ++i) 225 if (N->getOperand(i).getOpcode() != ISD::UNDEF) 226 return false; 227 228 return true; 229} 230 231/// getSetCCSwappedOperands - Return the operation corresponding to (Y op X) 232/// when given the operation for (X op Y). 233ISD::CondCode ISD::getSetCCSwappedOperands(ISD::CondCode Operation) { 234 // To perform this operation, we just need to swap the L and G bits of the 235 // operation. 236 unsigned OldL = (Operation >> 2) & 1; 237 unsigned OldG = (Operation >> 1) & 1; 238 return ISD::CondCode((Operation & ~6) | // Keep the N, U, E bits 239 (OldL << 1) | // New G bit 240 (OldG << 2)); // New L bit. 241} 242 243/// getSetCCInverse - Return the operation corresponding to !(X op Y), where 244/// 'op' is a valid SetCC operation. 245ISD::CondCode ISD::getSetCCInverse(ISD::CondCode Op, bool isInteger) { 246 unsigned Operation = Op; 247 if (isInteger) 248 Operation ^= 7; // Flip L, G, E bits, but not U. 249 else 250 Operation ^= 15; // Flip all of the condition bits. 251 252 if (Operation > ISD::SETTRUE2) 253 Operation &= ~8; // Don't let N and U bits get set. 254 255 return ISD::CondCode(Operation); 256} 257 258 259/// isSignedOp - For an integer comparison, return 1 if the comparison is a 260/// signed operation and 2 if the result is an unsigned comparison. Return zero 261/// if the operation does not depend on the sign of the input (setne and seteq). 262static int isSignedOp(ISD::CondCode Opcode) { 263 switch (Opcode) { 264 default: llvm_unreachable("Illegal integer setcc operation!"); 265 case ISD::SETEQ: 266 case ISD::SETNE: return 0; 267 case ISD::SETLT: 268 case ISD::SETLE: 269 case ISD::SETGT: 270 case ISD::SETGE: return 1; 271 case ISD::SETULT: 272 case ISD::SETULE: 273 case ISD::SETUGT: 274 case ISD::SETUGE: return 2; 275 } 276} 277 278/// getSetCCOrOperation - Return the result of a logical OR between different 279/// comparisons of identical values: ((X op1 Y) | (X op2 Y)). This function 280/// returns SETCC_INVALID if it is not possible to represent the resultant 281/// comparison. 282ISD::CondCode ISD::getSetCCOrOperation(ISD::CondCode Op1, ISD::CondCode Op2, 283 bool isInteger) { 284 if (isInteger && (isSignedOp(Op1) | isSignedOp(Op2)) == 3) 285 // Cannot fold a signed integer setcc with an unsigned integer setcc. 286 return ISD::SETCC_INVALID; 287 288 unsigned Op = Op1 | Op2; // Combine all of the condition bits. 289 290 // If the N and U bits get set then the resultant comparison DOES suddenly 291 // care about orderedness, and is true when ordered. 292 if (Op > ISD::SETTRUE2) 293 Op &= ~16; // Clear the U bit if the N bit is set. 294 295 // Canonicalize illegal integer setcc's. 296 if (isInteger && Op == ISD::SETUNE) // e.g. SETUGT | SETULT 297 Op = ISD::SETNE; 298 299 return ISD::CondCode(Op); 300} 301 302/// getSetCCAndOperation - Return the result of a logical AND between different 303/// comparisons of identical values: ((X op1 Y) & (X op2 Y)). This 304/// function returns zero if it is not possible to represent the resultant 305/// comparison. 306ISD::CondCode ISD::getSetCCAndOperation(ISD::CondCode Op1, ISD::CondCode Op2, 307 bool isInteger) { 308 if (isInteger && (isSignedOp(Op1) | isSignedOp(Op2)) == 3) 309 // Cannot fold a signed setcc with an unsigned setcc. 310 return ISD::SETCC_INVALID; 311 312 // Combine all of the condition bits. 313 ISD::CondCode Result = ISD::CondCode(Op1 & Op2); 314 315 // Canonicalize illegal integer setcc's. 316 if (isInteger) { 317 switch (Result) { 318 default: break; 319 case ISD::SETUO : Result = ISD::SETFALSE; break; // SETUGT & SETULT 320 case ISD::SETOEQ: // SETEQ & SETU[LG]E 321 case ISD::SETUEQ: Result = ISD::SETEQ ; break; // SETUGE & SETULE 322 case ISD::SETOLT: Result = ISD::SETULT ; break; // SETULT & SETNE 323 case ISD::SETOGT: Result = ISD::SETUGT ; break; // SETUGT & SETNE 324 } 325 } 326 327 return Result; 328} 329 330//===----------------------------------------------------------------------===// 331// SDNode Profile Support 332//===----------------------------------------------------------------------===// 333 334/// AddNodeIDOpcode - Add the node opcode to the NodeID data. 335/// 336static void AddNodeIDOpcode(FoldingSetNodeID &ID, unsigned OpC) { 337 ID.AddInteger(OpC); 338} 339 340/// AddNodeIDValueTypes - Value type lists are intern'd so we can represent them 341/// solely with their pointer. 342static void AddNodeIDValueTypes(FoldingSetNodeID &ID, SDVTList VTList) { 343 ID.AddPointer(VTList.VTs); 344} 345 346/// AddNodeIDOperands - Various routines for adding operands to the NodeID data. 347/// 348static void AddNodeIDOperands(FoldingSetNodeID &ID, 349 const SDValue *Ops, unsigned NumOps) { 350 for (; NumOps; --NumOps, ++Ops) { 351 ID.AddPointer(Ops->getNode()); 352 ID.AddInteger(Ops->getResNo()); 353 } 354} 355 356/// AddNodeIDOperands - Various routines for adding operands to the NodeID data. 357/// 358static void AddNodeIDOperands(FoldingSetNodeID &ID, 359 const SDUse *Ops, unsigned NumOps) { 360 for (; NumOps; --NumOps, ++Ops) { 361 ID.AddPointer(Ops->getNode()); 362 ID.AddInteger(Ops->getResNo()); 363 } 364} 365 366static void AddNodeIDNode(FoldingSetNodeID &ID, 367 unsigned short OpC, SDVTList VTList, 368 const SDValue *OpList, unsigned N) { 369 AddNodeIDOpcode(ID, OpC); 370 AddNodeIDValueTypes(ID, VTList); 371 AddNodeIDOperands(ID, OpList, N); 372} 373 374/// AddNodeIDCustom - If this is an SDNode with special info, add this info to 375/// the NodeID data. 376static void AddNodeIDCustom(FoldingSetNodeID &ID, const SDNode *N) { 377 switch (N->getOpcode()) { 378 case ISD::TargetExternalSymbol: 379 case ISD::ExternalSymbol: 380 llvm_unreachable("Should only be used on nodes with operands"); 381 default: break; // Normal nodes don't need extra info. 382 case ISD::TargetConstant: 383 case ISD::Constant: 384 ID.AddPointer(cast<ConstantSDNode>(N)->getConstantIntValue()); 385 break; 386 case ISD::TargetConstantFP: 387 case ISD::ConstantFP: { 388 ID.AddPointer(cast<ConstantFPSDNode>(N)->getConstantFPValue()); 389 break; 390 } 391 case ISD::TargetGlobalAddress: 392 case ISD::GlobalAddress: 393 case ISD::TargetGlobalTLSAddress: 394 case ISD::GlobalTLSAddress: { 395 const GlobalAddressSDNode *GA = cast<GlobalAddressSDNode>(N); 396 ID.AddPointer(GA->getGlobal()); 397 ID.AddInteger(GA->getOffset()); 398 ID.AddInteger(GA->getTargetFlags()); 399 ID.AddInteger(GA->getAddressSpace()); 400 break; 401 } 402 case ISD::BasicBlock: 403 ID.AddPointer(cast<BasicBlockSDNode>(N)->getBasicBlock()); 404 break; 405 case ISD::Register: 406 ID.AddInteger(cast<RegisterSDNode>(N)->getReg()); 407 break; 408 case ISD::RegisterMask: 409 ID.AddPointer(cast<RegisterMaskSDNode>(N)->getRegMask()); 410 break; 411 case ISD::SRCVALUE: 412 ID.AddPointer(cast<SrcValueSDNode>(N)->getValue()); 413 break; 414 case ISD::FrameIndex: 415 case ISD::TargetFrameIndex: 416 ID.AddInteger(cast<FrameIndexSDNode>(N)->getIndex()); 417 break; 418 case ISD::JumpTable: 419 case ISD::TargetJumpTable: 420 ID.AddInteger(cast<JumpTableSDNode>(N)->getIndex()); 421 ID.AddInteger(cast<JumpTableSDNode>(N)->getTargetFlags()); 422 break; 423 case ISD::ConstantPool: 424 case ISD::TargetConstantPool: { 425 const ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(N); 426 ID.AddInteger(CP->getAlignment()); 427 ID.AddInteger(CP->getOffset()); 428 if (CP->isMachineConstantPoolEntry()) 429 CP->getMachineCPVal()->addSelectionDAGCSEId(ID); 430 else 431 ID.AddPointer(CP->getConstVal()); 432 ID.AddInteger(CP->getTargetFlags()); 433 break; 434 } 435 case ISD::TargetIndex: { 436 const TargetIndexSDNode *TI = cast<TargetIndexSDNode>(N); 437 ID.AddInteger(TI->getIndex()); 438 ID.AddInteger(TI->getOffset()); 439 ID.AddInteger(TI->getTargetFlags()); 440 break; 441 } 442 case ISD::LOAD: { 443 const LoadSDNode *LD = cast<LoadSDNode>(N); 444 ID.AddInteger(LD->getMemoryVT().getRawBits()); 445 ID.AddInteger(LD->getRawSubclassData()); 446 ID.AddInteger(LD->getPointerInfo().getAddrSpace()); 447 break; 448 } 449 case ISD::STORE: { 450 const StoreSDNode *ST = cast<StoreSDNode>(N); 451 ID.AddInteger(ST->getMemoryVT().getRawBits()); 452 ID.AddInteger(ST->getRawSubclassData()); 453 ID.AddInteger(ST->getPointerInfo().getAddrSpace()); 454 break; 455 } 456 case ISD::ATOMIC_CMP_SWAP: 457 case ISD::ATOMIC_SWAP: 458 case ISD::ATOMIC_LOAD_ADD: 459 case ISD::ATOMIC_LOAD_SUB: 460 case ISD::ATOMIC_LOAD_AND: 461 case ISD::ATOMIC_LOAD_OR: 462 case ISD::ATOMIC_LOAD_XOR: 463 case ISD::ATOMIC_LOAD_NAND: 464 case ISD::ATOMIC_LOAD_MIN: 465 case ISD::ATOMIC_LOAD_MAX: 466 case ISD::ATOMIC_LOAD_UMIN: 467 case ISD::ATOMIC_LOAD_UMAX: 468 case ISD::ATOMIC_LOAD: 469 case ISD::ATOMIC_STORE: { 470 const AtomicSDNode *AT = cast<AtomicSDNode>(N); 471 ID.AddInteger(AT->getMemoryVT().getRawBits()); 472 ID.AddInteger(AT->getRawSubclassData()); 473 ID.AddInteger(AT->getPointerInfo().getAddrSpace()); 474 break; 475 } 476 case ISD::PREFETCH: { 477 const MemSDNode *PF = cast<MemSDNode>(N); 478 ID.AddInteger(PF->getPointerInfo().getAddrSpace()); 479 break; 480 } 481 case ISD::VECTOR_SHUFFLE: { 482 const ShuffleVectorSDNode *SVN = cast<ShuffleVectorSDNode>(N); 483 for (unsigned i = 0, e = N->getValueType(0).getVectorNumElements(); 484 i != e; ++i) 485 ID.AddInteger(SVN->getMaskElt(i)); 486 break; 487 } 488 case ISD::TargetBlockAddress: 489 case ISD::BlockAddress: { 490 const BlockAddressSDNode *BA = cast<BlockAddressSDNode>(N); 491 ID.AddPointer(BA->getBlockAddress()); 492 ID.AddInteger(BA->getOffset()); 493 ID.AddInteger(BA->getTargetFlags()); 494 break; 495 } 496 } // end switch (N->getOpcode()) 497 498 // Target specific memory nodes could also have address spaces to check. 499 if (N->isTargetMemoryOpcode()) 500 ID.AddInteger(cast<MemSDNode>(N)->getPointerInfo().getAddrSpace()); 501} 502 503/// AddNodeIDNode - Generic routine for adding a nodes info to the NodeID 504/// data. 505static void AddNodeIDNode(FoldingSetNodeID &ID, const SDNode *N) { 506 AddNodeIDOpcode(ID, N->getOpcode()); 507 // Add the return value info. 508 AddNodeIDValueTypes(ID, N->getVTList()); 509 // Add the operand info. 510 AddNodeIDOperands(ID, N->op_begin(), N->getNumOperands()); 511 512 // Handle SDNode leafs with special info. 513 AddNodeIDCustom(ID, N); 514} 515 516/// encodeMemSDNodeFlags - Generic routine for computing a value for use in 517/// the CSE map that carries volatility, temporalness, indexing mode, and 518/// extension/truncation information. 519/// 520static inline unsigned 521encodeMemSDNodeFlags(int ConvType, ISD::MemIndexedMode AM, bool isVolatile, 522 bool isNonTemporal, bool isInvariant) { 523 assert((ConvType & 3) == ConvType && 524 "ConvType may not require more than 2 bits!"); 525 assert((AM & 7) == AM && 526 "AM may not require more than 3 bits!"); 527 return ConvType | 528 (AM << 2) | 529 (isVolatile << 5) | 530 (isNonTemporal << 6) | 531 (isInvariant << 7); 532} 533 534//===----------------------------------------------------------------------===// 535// SelectionDAG Class 536//===----------------------------------------------------------------------===// 537 538/// doNotCSE - Return true if CSE should not be performed for this node. 539static bool doNotCSE(SDNode *N) { 540 if (N->getValueType(0) == MVT::Glue) 541 return true; // Never CSE anything that produces a flag. 542 543 switch (N->getOpcode()) { 544 default: break; 545 case ISD::HANDLENODE: 546 case ISD::EH_LABEL: 547 return true; // Never CSE these nodes. 548 } 549 550 // Check that remaining values produced are not flags. 551 for (unsigned i = 1, e = N->getNumValues(); i != e; ++i) 552 if (N->getValueType(i) == MVT::Glue) 553 return true; // Never CSE anything that produces a flag. 554 555 return false; 556} 557 558/// RemoveDeadNodes - This method deletes all unreachable nodes in the 559/// SelectionDAG. 560void SelectionDAG::RemoveDeadNodes() { 561 // Create a dummy node (which is not added to allnodes), that adds a reference 562 // to the root node, preventing it from being deleted. 563 HandleSDNode Dummy(getRoot()); 564 565 SmallVector<SDNode*, 128> DeadNodes; 566 567 // Add all obviously-dead nodes to the DeadNodes worklist. 568 for (allnodes_iterator I = allnodes_begin(), E = allnodes_end(); I != E; ++I) 569 if (I->use_empty()) 570 DeadNodes.push_back(I); 571 572 RemoveDeadNodes(DeadNodes); 573 574 // If the root changed (e.g. it was a dead load, update the root). 575 setRoot(Dummy.getValue()); 576} 577 578/// RemoveDeadNodes - This method deletes the unreachable nodes in the 579/// given list, and any nodes that become unreachable as a result. 580void SelectionDAG::RemoveDeadNodes(SmallVectorImpl<SDNode *> &DeadNodes) { 581 582 // Process the worklist, deleting the nodes and adding their uses to the 583 // worklist. 584 while (!DeadNodes.empty()) { 585 SDNode *N = DeadNodes.pop_back_val(); 586 587 for (DAGUpdateListener *DUL = UpdateListeners; DUL; DUL = DUL->Next) 588 DUL->NodeDeleted(N, 0); 589 590 // Take the node out of the appropriate CSE map. 591 RemoveNodeFromCSEMaps(N); 592 593 // Next, brutally remove the operand list. This is safe to do, as there are 594 // no cycles in the graph. 595 for (SDNode::op_iterator I = N->op_begin(), E = N->op_end(); I != E; ) { 596 SDUse &Use = *I++; 597 SDNode *Operand = Use.getNode(); 598 Use.set(SDValue()); 599 600 // Now that we removed this operand, see if there are no uses of it left. 601 if (Operand->use_empty()) 602 DeadNodes.push_back(Operand); 603 } 604 605 DeallocateNode(N); 606 } 607} 608 609void SelectionDAG::RemoveDeadNode(SDNode *N){ 610 SmallVector<SDNode*, 16> DeadNodes(1, N); 611 612 // Create a dummy node that adds a reference to the root node, preventing 613 // it from being deleted. (This matters if the root is an operand of the 614 // dead node.) 615 HandleSDNode Dummy(getRoot()); 616 617 RemoveDeadNodes(DeadNodes); 618} 619 620void SelectionDAG::DeleteNode(SDNode *N) { 621 // First take this out of the appropriate CSE map. 622 RemoveNodeFromCSEMaps(N); 623 624 // Finally, remove uses due to operands of this node, remove from the 625 // AllNodes list, and delete the node. 626 DeleteNodeNotInCSEMaps(N); 627} 628 629void SelectionDAG::DeleteNodeNotInCSEMaps(SDNode *N) { 630 assert(N != AllNodes.begin() && "Cannot delete the entry node!"); 631 assert(N->use_empty() && "Cannot delete a node that is not dead!"); 632 633 // Drop all of the operands and decrement used node's use counts. 634 N->DropOperands(); 635 636 DeallocateNode(N); 637} 638 639void SelectionDAG::DeallocateNode(SDNode *N) { 640 if (N->OperandsNeedDelete) 641 delete[] N->OperandList; 642 643 // Set the opcode to DELETED_NODE to help catch bugs when node 644 // memory is reallocated. 645 N->NodeType = ISD::DELETED_NODE; 646 647 NodeAllocator.Deallocate(AllNodes.remove(N)); 648 649 // Remove the ordering of this node. 650 Ordering->remove(N); 651 652 // If any of the SDDbgValue nodes refer to this SDNode, invalidate them. 653 ArrayRef<SDDbgValue*> DbgVals = DbgInfo->getSDDbgValues(N); 654 for (unsigned i = 0, e = DbgVals.size(); i != e; ++i) 655 DbgVals[i]->setIsInvalidated(); 656} 657 658/// RemoveNodeFromCSEMaps - Take the specified node out of the CSE map that 659/// correspond to it. This is useful when we're about to delete or repurpose 660/// the node. We don't want future request for structurally identical nodes 661/// to return N anymore. 662bool SelectionDAG::RemoveNodeFromCSEMaps(SDNode *N) { 663 bool Erased = false; 664 switch (N->getOpcode()) { 665 case ISD::HANDLENODE: return false; // noop. 666 case ISD::CONDCODE: 667 assert(CondCodeNodes[cast<CondCodeSDNode>(N)->get()] && 668 "Cond code doesn't exist!"); 669 Erased = CondCodeNodes[cast<CondCodeSDNode>(N)->get()] != 0; 670 CondCodeNodes[cast<CondCodeSDNode>(N)->get()] = 0; 671 break; 672 case ISD::ExternalSymbol: 673 Erased = ExternalSymbols.erase(cast<ExternalSymbolSDNode>(N)->getSymbol()); 674 break; 675 case ISD::TargetExternalSymbol: { 676 ExternalSymbolSDNode *ESN = cast<ExternalSymbolSDNode>(N); 677 Erased = TargetExternalSymbols.erase( 678 std::pair<std::string,unsigned char>(ESN->getSymbol(), 679 ESN->getTargetFlags())); 680 break; 681 } 682 case ISD::VALUETYPE: { 683 EVT VT = cast<VTSDNode>(N)->getVT(); 684 if (VT.isExtended()) { 685 Erased = ExtendedValueTypeNodes.erase(VT); 686 } else { 687 Erased = ValueTypeNodes[VT.getSimpleVT().SimpleTy] != 0; 688 ValueTypeNodes[VT.getSimpleVT().SimpleTy] = 0; 689 } 690 break; 691 } 692 default: 693 // Remove it from the CSE Map. 694 assert(N->getOpcode() != ISD::DELETED_NODE && "DELETED_NODE in CSEMap!"); 695 assert(N->getOpcode() != ISD::EntryToken && "EntryToken in CSEMap!"); 696 Erased = CSEMap.RemoveNode(N); 697 break; 698 } 699#ifndef NDEBUG 700 // Verify that the node was actually in one of the CSE maps, unless it has a 701 // flag result (which cannot be CSE'd) or is one of the special cases that are 702 // not subject to CSE. 703 if (!Erased && N->getValueType(N->getNumValues()-1) != MVT::Glue && 704 !N->isMachineOpcode() && !doNotCSE(N)) { 705 N->dump(this); 706 dbgs() << "\n"; 707 llvm_unreachable("Node is not in map!"); 708 } 709#endif 710 return Erased; 711} 712 713/// AddModifiedNodeToCSEMaps - The specified node has been removed from the CSE 714/// maps and modified in place. Add it back to the CSE maps, unless an identical 715/// node already exists, in which case transfer all its users to the existing 716/// node. This transfer can potentially trigger recursive merging. 717/// 718void 719SelectionDAG::AddModifiedNodeToCSEMaps(SDNode *N) { 720 // For node types that aren't CSE'd, just act as if no identical node 721 // already exists. 722 if (!doNotCSE(N)) { 723 SDNode *Existing = CSEMap.GetOrInsertNode(N); 724 if (Existing != N) { 725 // If there was already an existing matching node, use ReplaceAllUsesWith 726 // to replace the dead one with the existing one. This can cause 727 // recursive merging of other unrelated nodes down the line. 728 ReplaceAllUsesWith(N, Existing); 729 730 // N is now dead. Inform the listeners and delete it. 731 for (DAGUpdateListener *DUL = UpdateListeners; DUL; DUL = DUL->Next) 732 DUL->NodeDeleted(N, Existing); 733 DeleteNodeNotInCSEMaps(N); 734 return; 735 } 736 } 737 738 // If the node doesn't already exist, we updated it. Inform listeners. 739 for (DAGUpdateListener *DUL = UpdateListeners; DUL; DUL = DUL->Next) 740 DUL->NodeUpdated(N); 741} 742 743/// FindModifiedNodeSlot - Find a slot for the specified node if its operands 744/// were replaced with those specified. If this node is never memoized, 745/// return null, otherwise return a pointer to the slot it would take. If a 746/// node already exists with these operands, the slot will be non-null. 747SDNode *SelectionDAG::FindModifiedNodeSlot(SDNode *N, SDValue Op, 748 void *&InsertPos) { 749 if (doNotCSE(N)) 750 return 0; 751 752 SDValue Ops[] = { Op }; 753 FoldingSetNodeID ID; 754 AddNodeIDNode(ID, N->getOpcode(), N->getVTList(), Ops, 1); 755 AddNodeIDCustom(ID, N); 756 SDNode *Node = CSEMap.FindNodeOrInsertPos(ID, InsertPos); 757 return Node; 758} 759 760/// FindModifiedNodeSlot - Find a slot for the specified node if its operands 761/// were replaced with those specified. If this node is never memoized, 762/// return null, otherwise return a pointer to the slot it would take. If a 763/// node already exists with these operands, the slot will be non-null. 764SDNode *SelectionDAG::FindModifiedNodeSlot(SDNode *N, 765 SDValue Op1, SDValue Op2, 766 void *&InsertPos) { 767 if (doNotCSE(N)) 768 return 0; 769 770 SDValue Ops[] = { Op1, Op2 }; 771 FoldingSetNodeID ID; 772 AddNodeIDNode(ID, N->getOpcode(), N->getVTList(), Ops, 2); 773 AddNodeIDCustom(ID, N); 774 SDNode *Node = CSEMap.FindNodeOrInsertPos(ID, InsertPos); 775 return Node; 776} 777 778 779/// FindModifiedNodeSlot - Find a slot for the specified node if its operands 780/// were replaced with those specified. If this node is never memoized, 781/// return null, otherwise return a pointer to the slot it would take. If a 782/// node already exists with these operands, the slot will be non-null. 783SDNode *SelectionDAG::FindModifiedNodeSlot(SDNode *N, 784 const SDValue *Ops,unsigned NumOps, 785 void *&InsertPos) { 786 if (doNotCSE(N)) 787 return 0; 788 789 FoldingSetNodeID ID; 790 AddNodeIDNode(ID, N->getOpcode(), N->getVTList(), Ops, NumOps); 791 AddNodeIDCustom(ID, N); 792 SDNode *Node = CSEMap.FindNodeOrInsertPos(ID, InsertPos); 793 return Node; 794} 795 796#ifndef NDEBUG 797/// VerifyNodeCommon - Sanity check the given node. Aborts if it is invalid. 798static void VerifyNodeCommon(SDNode *N) { 799 switch (N->getOpcode()) { 800 default: 801 break; 802 case ISD::BUILD_PAIR: { 803 EVT VT = N->getValueType(0); 804 assert(N->getNumValues() == 1 && "Too many results!"); 805 assert(!VT.isVector() && (VT.isInteger() || VT.isFloatingPoint()) && 806 "Wrong return type!"); 807 assert(N->getNumOperands() == 2 && "Wrong number of operands!"); 808 assert(N->getOperand(0).getValueType() == N->getOperand(1).getValueType() && 809 "Mismatched operand types!"); 810 assert(N->getOperand(0).getValueType().isInteger() == VT.isInteger() && 811 "Wrong operand type!"); 812 assert(VT.getSizeInBits() == 2 * N->getOperand(0).getValueSizeInBits() && 813 "Wrong return type size"); 814 break; 815 } 816 case ISD::BUILD_VECTOR: { 817 assert(N->getNumValues() == 1 && "Too many results!"); 818 assert(N->getValueType(0).isVector() && "Wrong return type!"); 819 assert(N->getNumOperands() == N->getValueType(0).getVectorNumElements() && 820 "Wrong number of operands!"); 821 EVT EltVT = N->getValueType(0).getVectorElementType(); 822 for (SDNode::op_iterator I = N->op_begin(), E = N->op_end(); I != E; ++I) { 823 assert((I->getValueType() == EltVT || 824 (EltVT.isInteger() && I->getValueType().isInteger() && 825 EltVT.bitsLE(I->getValueType()))) && 826 "Wrong operand type!"); 827 assert(I->getValueType() == N->getOperand(0).getValueType() && 828 "Operands must all have the same type"); 829 } 830 break; 831 } 832 } 833} 834 835/// VerifySDNode - Sanity check the given SDNode. Aborts if it is invalid. 836static void VerifySDNode(SDNode *N) { 837 // The SDNode allocators cannot be used to allocate nodes with fields that are 838 // not present in an SDNode! 839 assert(!isa<MemSDNode>(N) && "Bad MemSDNode!"); 840 assert(!isa<ShuffleVectorSDNode>(N) && "Bad ShuffleVectorSDNode!"); 841 assert(!isa<ConstantSDNode>(N) && "Bad ConstantSDNode!"); 842 assert(!isa<ConstantFPSDNode>(N) && "Bad ConstantFPSDNode!"); 843 assert(!isa<GlobalAddressSDNode>(N) && "Bad GlobalAddressSDNode!"); 844 assert(!isa<FrameIndexSDNode>(N) && "Bad FrameIndexSDNode!"); 845 assert(!isa<JumpTableSDNode>(N) && "Bad JumpTableSDNode!"); 846 assert(!isa<ConstantPoolSDNode>(N) && "Bad ConstantPoolSDNode!"); 847 assert(!isa<BasicBlockSDNode>(N) && "Bad BasicBlockSDNode!"); 848 assert(!isa<SrcValueSDNode>(N) && "Bad SrcValueSDNode!"); 849 assert(!isa<MDNodeSDNode>(N) && "Bad MDNodeSDNode!"); 850 assert(!isa<RegisterSDNode>(N) && "Bad RegisterSDNode!"); 851 assert(!isa<BlockAddressSDNode>(N) && "Bad BlockAddressSDNode!"); 852 assert(!isa<EHLabelSDNode>(N) && "Bad EHLabelSDNode!"); 853 assert(!isa<ExternalSymbolSDNode>(N) && "Bad ExternalSymbolSDNode!"); 854 assert(!isa<CondCodeSDNode>(N) && "Bad CondCodeSDNode!"); 855 assert(!isa<CvtRndSatSDNode>(N) && "Bad CvtRndSatSDNode!"); 856 assert(!isa<VTSDNode>(N) && "Bad VTSDNode!"); 857 assert(!isa<MachineSDNode>(N) && "Bad MachineSDNode!"); 858 859 VerifyNodeCommon(N); 860} 861 862/// VerifyMachineNode - Sanity check the given MachineNode. Aborts if it is 863/// invalid. 864static void VerifyMachineNode(SDNode *N) { 865 // The MachineNode allocators cannot be used to allocate nodes with fields 866 // that are not present in a MachineNode! 867 // Currently there are no such nodes. 868 869 VerifyNodeCommon(N); 870} 871#endif // NDEBUG 872 873/// getEVTAlignment - Compute the default alignment value for the 874/// given type. 875/// 876unsigned SelectionDAG::getEVTAlignment(EVT VT) const { 877 Type *Ty = VT == MVT::iPTR ? 878 PointerType::get(Type::getInt8Ty(*getContext()), 0) : 879 VT.getTypeForEVT(*getContext()); 880 881 return TLI.getDataLayout()->getABITypeAlignment(Ty); 882} 883 884// EntryNode could meaningfully have debug info if we can find it... 885SelectionDAG::SelectionDAG(const TargetMachine &tm, CodeGenOpt::Level OL) 886 : TM(tm), TLI(*tm.getTargetLowering()), TSI(*tm.getSelectionDAGInfo()), 887 OptLevel(OL), EntryNode(ISD::EntryToken, DebugLoc(), getVTList(MVT::Other)), 888 Root(getEntryNode()), Ordering(0), UpdateListeners(0) { 889 AllNodes.push_back(&EntryNode); 890 Ordering = new SDNodeOrdering(); 891 DbgInfo = new SDDbgInfo(); 892} 893 894void SelectionDAG::init(MachineFunction &mf) { 895 MF = &mf; 896 Context = &mf.getFunction()->getContext(); 897} 898 899SelectionDAG::~SelectionDAG() { 900 assert(!UpdateListeners && "Dangling registered DAGUpdateListeners"); 901 allnodes_clear(); 902 delete Ordering; 903 delete DbgInfo; 904} 905 906void SelectionDAG::allnodes_clear() { 907 assert(&*AllNodes.begin() == &EntryNode); 908 AllNodes.remove(AllNodes.begin()); 909 while (!AllNodes.empty()) 910 DeallocateNode(AllNodes.begin()); 911} 912 913void SelectionDAG::clear() { 914 allnodes_clear(); 915 OperandAllocator.Reset(); 916 CSEMap.clear(); 917 918 ExtendedValueTypeNodes.clear(); 919 ExternalSymbols.clear(); 920 TargetExternalSymbols.clear(); 921 std::fill(CondCodeNodes.begin(), CondCodeNodes.end(), 922 static_cast<CondCodeSDNode*>(0)); 923 std::fill(ValueTypeNodes.begin(), ValueTypeNodes.end(), 924 static_cast<SDNode*>(0)); 925 926 EntryNode.UseList = 0; 927 AllNodes.push_back(&EntryNode); 928 Root = getEntryNode(); 929 Ordering->clear(); 930 DbgInfo->clear(); 931} 932 933SDValue SelectionDAG::getAnyExtOrTrunc(SDValue Op, DebugLoc DL, EVT VT) { 934 return VT.bitsGT(Op.getValueType()) ? 935 getNode(ISD::ANY_EXTEND, DL, VT, Op) : 936 getNode(ISD::TRUNCATE, DL, VT, Op); 937} 938 939SDValue SelectionDAG::getSExtOrTrunc(SDValue Op, DebugLoc DL, EVT VT) { 940 return VT.bitsGT(Op.getValueType()) ? 941 getNode(ISD::SIGN_EXTEND, DL, VT, Op) : 942 getNode(ISD::TRUNCATE, DL, VT, Op); 943} 944 945SDValue SelectionDAG::getZExtOrTrunc(SDValue Op, DebugLoc DL, EVT VT) { 946 return VT.bitsGT(Op.getValueType()) ? 947 getNode(ISD::ZERO_EXTEND, DL, VT, Op) : 948 getNode(ISD::TRUNCATE, DL, VT, Op); 949} 950 951SDValue SelectionDAG::getZeroExtendInReg(SDValue Op, DebugLoc DL, EVT VT) { 952 assert(!VT.isVector() && 953 "getZeroExtendInReg should use the vector element type instead of " 954 "the vector type!"); 955 if (Op.getValueType() == VT) return Op; 956 unsigned BitWidth = Op.getValueType().getScalarType().getSizeInBits(); 957 APInt Imm = APInt::getLowBitsSet(BitWidth, 958 VT.getSizeInBits()); 959 return getNode(ISD::AND, DL, Op.getValueType(), Op, 960 getConstant(Imm, Op.getValueType())); 961} 962 963/// getNOT - Create a bitwise NOT operation as (XOR Val, -1). 964/// 965SDValue SelectionDAG::getNOT(DebugLoc DL, SDValue Val, EVT VT) { 966 EVT EltVT = VT.getScalarType(); 967 SDValue NegOne = 968 getConstant(APInt::getAllOnesValue(EltVT.getSizeInBits()), VT); 969 return getNode(ISD::XOR, DL, VT, Val, NegOne); 970} 971 972SDValue SelectionDAG::getConstant(uint64_t Val, EVT VT, bool isT) { 973 EVT EltVT = VT.getScalarType(); 974 assert((EltVT.getSizeInBits() >= 64 || 975 (uint64_t)((int64_t)Val >> EltVT.getSizeInBits()) + 1 < 2) && 976 "getConstant with a uint64_t value that doesn't fit in the type!"); 977 return getConstant(APInt(EltVT.getSizeInBits(), Val), VT, isT); 978} 979 980SDValue SelectionDAG::getConstant(const APInt &Val, EVT VT, bool isT) { 981 return getConstant(*ConstantInt::get(*Context, Val), VT, isT); 982} 983 984SDValue SelectionDAG::getConstant(const ConstantInt &Val, EVT VT, bool isT) { 985 assert(VT.isInteger() && "Cannot create FP integer constant!"); 986 987 EVT EltVT = VT.getScalarType(); 988 const ConstantInt *Elt = &Val; 989 990 // In some cases the vector type is legal but the element type is illegal and 991 // needs to be promoted, for example v8i8 on ARM. In this case, promote the 992 // inserted value (the type does not need to match the vector element type). 993 // Any extra bits introduced will be truncated away. 994 if (VT.isVector() && TLI.getTypeAction(*getContext(), EltVT) == 995 TargetLowering::TypePromoteInteger) { 996 EltVT = TLI.getTypeToTransformTo(*getContext(), EltVT); 997 APInt NewVal = Elt->getValue().zext(EltVT.getSizeInBits()); 998 Elt = ConstantInt::get(*getContext(), NewVal); 999 } 1000 1001 assert(Elt->getBitWidth() == EltVT.getSizeInBits() && 1002 "APInt size does not match type size!"); 1003 unsigned Opc = isT ? ISD::TargetConstant : ISD::Constant; 1004 FoldingSetNodeID ID; 1005 AddNodeIDNode(ID, Opc, getVTList(EltVT), 0, 0); 1006 ID.AddPointer(Elt); 1007 void *IP = 0; 1008 SDNode *N = NULL; 1009 if ((N = CSEMap.FindNodeOrInsertPos(ID, IP))) 1010 if (!VT.isVector()) 1011 return SDValue(N, 0); 1012 1013 if (!N) { 1014 N = new (NodeAllocator) ConstantSDNode(isT, Elt, EltVT); 1015 CSEMap.InsertNode(N, IP); 1016 AllNodes.push_back(N); 1017 } 1018 1019 SDValue Result(N, 0); 1020 if (VT.isVector()) { 1021 SmallVector<SDValue, 8> Ops; 1022 Ops.assign(VT.getVectorNumElements(), Result); 1023 Result = getNode(ISD::BUILD_VECTOR, DebugLoc(), VT, &Ops[0], Ops.size()); 1024 } 1025 return Result; 1026} 1027 1028SDValue SelectionDAG::getIntPtrConstant(uint64_t Val, bool isTarget) { 1029 return getConstant(Val, TLI.getPointerTy(), isTarget); 1030} 1031 1032 1033SDValue SelectionDAG::getConstantFP(const APFloat& V, EVT VT, bool isTarget) { 1034 return getConstantFP(*ConstantFP::get(*getContext(), V), VT, isTarget); 1035} 1036 1037SDValue SelectionDAG::getConstantFP(const ConstantFP& V, EVT VT, bool isTarget){ 1038 assert(VT.isFloatingPoint() && "Cannot create integer FP constant!"); 1039 1040 EVT EltVT = VT.getScalarType(); 1041 1042 // Do the map lookup using the actual bit pattern for the floating point 1043 // value, so that we don't have problems with 0.0 comparing equal to -0.0, and 1044 // we don't have issues with SNANs. 1045 unsigned Opc = isTarget ? ISD::TargetConstantFP : ISD::ConstantFP; 1046 FoldingSetNodeID ID; 1047 AddNodeIDNode(ID, Opc, getVTList(EltVT), 0, 0); 1048 ID.AddPointer(&V); 1049 void *IP = 0; 1050 SDNode *N = NULL; 1051 if ((N = CSEMap.FindNodeOrInsertPos(ID, IP))) 1052 if (!VT.isVector()) 1053 return SDValue(N, 0); 1054 1055 if (!N) { 1056 N = new (NodeAllocator) ConstantFPSDNode(isTarget, &V, EltVT); 1057 CSEMap.InsertNode(N, IP); 1058 AllNodes.push_back(N); 1059 } 1060 1061 SDValue Result(N, 0); 1062 if (VT.isVector()) { 1063 SmallVector<SDValue, 8> Ops; 1064 Ops.assign(VT.getVectorNumElements(), Result); 1065 // FIXME DebugLoc info might be appropriate here 1066 Result = getNode(ISD::BUILD_VECTOR, DebugLoc(), VT, &Ops[0], Ops.size()); 1067 } 1068 return Result; 1069} 1070 1071SDValue SelectionDAG::getConstantFP(double Val, EVT VT, bool isTarget) { 1072 EVT EltVT = VT.getScalarType(); 1073 if (EltVT==MVT::f32) 1074 return getConstantFP(APFloat((float)Val), VT, isTarget); 1075 else if (EltVT==MVT::f64) 1076 return getConstantFP(APFloat(Val), VT, isTarget); 1077 else if (EltVT==MVT::f80 || EltVT==MVT::f128 || EltVT==MVT::f16) { 1078 bool ignored; 1079 APFloat apf = APFloat(Val); 1080 apf.convert(*EVTToAPFloatSemantics(EltVT), APFloat::rmNearestTiesToEven, 1081 &ignored); 1082 return getConstantFP(apf, VT, isTarget); 1083 } else 1084 llvm_unreachable("Unsupported type in getConstantFP"); 1085} 1086 1087SDValue SelectionDAG::getGlobalAddress(const GlobalValue *GV, DebugLoc DL, 1088 EVT VT, int64_t Offset, 1089 bool isTargetGA, 1090 unsigned char TargetFlags) { 1091 assert((TargetFlags == 0 || isTargetGA) && 1092 "Cannot set target flags on target-independent globals"); 1093 1094 // Truncate (with sign-extension) the offset value to the pointer size. 1095 unsigned BitWidth = TLI.getPointerTy().getSizeInBits(); 1096 if (BitWidth < 64) 1097 Offset = SignExtend64(Offset, BitWidth); 1098 1099 const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV); 1100 if (!GVar) { 1101 // If GV is an alias then use the aliasee for determining thread-localness. 1102 if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(GV)) 1103 GVar = dyn_cast_or_null<GlobalVariable>(GA->resolveAliasedGlobal(false)); 1104 } 1105 1106 unsigned Opc; 1107 if (GVar && GVar->isThreadLocal()) 1108 Opc = isTargetGA ? ISD::TargetGlobalTLSAddress : ISD::GlobalTLSAddress; 1109 else 1110 Opc = isTargetGA ? ISD::TargetGlobalAddress : ISD::GlobalAddress; 1111 1112 FoldingSetNodeID ID; 1113 AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0); 1114 ID.AddPointer(GV); 1115 ID.AddInteger(Offset); 1116 ID.AddInteger(TargetFlags); 1117 ID.AddInteger(GV->getType()->getAddressSpace()); 1118 void *IP = 0; 1119 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 1120 return SDValue(E, 0); 1121 1122 SDNode *N = new (NodeAllocator) GlobalAddressSDNode(Opc, DL, GV, VT, 1123 Offset, TargetFlags); 1124 CSEMap.InsertNode(N, IP); 1125 AllNodes.push_back(N); 1126 return SDValue(N, 0); 1127} 1128 1129SDValue SelectionDAG::getFrameIndex(int FI, EVT VT, bool isTarget) { 1130 unsigned Opc = isTarget ? ISD::TargetFrameIndex : ISD::FrameIndex; 1131 FoldingSetNodeID ID; 1132 AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0); 1133 ID.AddInteger(FI); 1134 void *IP = 0; 1135 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 1136 return SDValue(E, 0); 1137 1138 SDNode *N = new (NodeAllocator) FrameIndexSDNode(FI, VT, isTarget); 1139 CSEMap.InsertNode(N, IP); 1140 AllNodes.push_back(N); 1141 return SDValue(N, 0); 1142} 1143 1144SDValue SelectionDAG::getJumpTable(int JTI, EVT VT, bool isTarget, 1145 unsigned char TargetFlags) { 1146 assert((TargetFlags == 0 || isTarget) && 1147 "Cannot set target flags on target-independent jump tables"); 1148 unsigned Opc = isTarget ? ISD::TargetJumpTable : ISD::JumpTable; 1149 FoldingSetNodeID ID; 1150 AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0); 1151 ID.AddInteger(JTI); 1152 ID.AddInteger(TargetFlags); 1153 void *IP = 0; 1154 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 1155 return SDValue(E, 0); 1156 1157 SDNode *N = new (NodeAllocator) JumpTableSDNode(JTI, VT, isTarget, 1158 TargetFlags); 1159 CSEMap.InsertNode(N, IP); 1160 AllNodes.push_back(N); 1161 return SDValue(N, 0); 1162} 1163 1164SDValue SelectionDAG::getConstantPool(const Constant *C, EVT VT, 1165 unsigned Alignment, int Offset, 1166 bool isTarget, 1167 unsigned char TargetFlags) { 1168 assert((TargetFlags == 0 || isTarget) && 1169 "Cannot set target flags on target-independent globals"); 1170 if (Alignment == 0) 1171 Alignment = TLI.getDataLayout()->getPrefTypeAlignment(C->getType()); 1172 unsigned Opc = isTarget ? ISD::TargetConstantPool : ISD::ConstantPool; 1173 FoldingSetNodeID ID; 1174 AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0); 1175 ID.AddInteger(Alignment); 1176 ID.AddInteger(Offset); 1177 ID.AddPointer(C); 1178 ID.AddInteger(TargetFlags); 1179 void *IP = 0; 1180 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 1181 return SDValue(E, 0); 1182 1183 SDNode *N = new (NodeAllocator) ConstantPoolSDNode(isTarget, C, VT, Offset, 1184 Alignment, TargetFlags); 1185 CSEMap.InsertNode(N, IP); 1186 AllNodes.push_back(N); 1187 return SDValue(N, 0); 1188} 1189 1190 1191SDValue SelectionDAG::getConstantPool(MachineConstantPoolValue *C, EVT VT, 1192 unsigned Alignment, int Offset, 1193 bool isTarget, 1194 unsigned char TargetFlags) { 1195 assert((TargetFlags == 0 || isTarget) && 1196 "Cannot set target flags on target-independent globals"); 1197 if (Alignment == 0) 1198 Alignment = TLI.getDataLayout()->getPrefTypeAlignment(C->getType()); 1199 unsigned Opc = isTarget ? ISD::TargetConstantPool : ISD::ConstantPool; 1200 FoldingSetNodeID ID; 1201 AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0); 1202 ID.AddInteger(Alignment); 1203 ID.AddInteger(Offset); 1204 C->addSelectionDAGCSEId(ID); 1205 ID.AddInteger(TargetFlags); 1206 void *IP = 0; 1207 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 1208 return SDValue(E, 0); 1209 1210 SDNode *N = new (NodeAllocator) ConstantPoolSDNode(isTarget, C, VT, Offset, 1211 Alignment, TargetFlags); 1212 CSEMap.InsertNode(N, IP); 1213 AllNodes.push_back(N); 1214 return SDValue(N, 0); 1215} 1216 1217SDValue SelectionDAG::getTargetIndex(int Index, EVT VT, int64_t Offset, 1218 unsigned char TargetFlags) { 1219 FoldingSetNodeID ID; 1220 AddNodeIDNode(ID, ISD::TargetIndex, getVTList(VT), 0, 0); 1221 ID.AddInteger(Index); 1222 ID.AddInteger(Offset); 1223 ID.AddInteger(TargetFlags); 1224 void *IP = 0; 1225 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 1226 return SDValue(E, 0); 1227 1228 SDNode *N = new (NodeAllocator) TargetIndexSDNode(Index, VT, Offset, 1229 TargetFlags); 1230 CSEMap.InsertNode(N, IP); 1231 AllNodes.push_back(N); 1232 return SDValue(N, 0); 1233} 1234 1235SDValue SelectionDAG::getBasicBlock(MachineBasicBlock *MBB) { 1236 FoldingSetNodeID ID; 1237 AddNodeIDNode(ID, ISD::BasicBlock, getVTList(MVT::Other), 0, 0); 1238 ID.AddPointer(MBB); 1239 void *IP = 0; 1240 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 1241 return SDValue(E, 0); 1242 1243 SDNode *N = new (NodeAllocator) BasicBlockSDNode(MBB); 1244 CSEMap.InsertNode(N, IP); 1245 AllNodes.push_back(N); 1246 return SDValue(N, 0); 1247} 1248 1249SDValue SelectionDAG::getValueType(EVT VT) { 1250 if (VT.isSimple() && (unsigned)VT.getSimpleVT().SimpleTy >= 1251 ValueTypeNodes.size()) 1252 ValueTypeNodes.resize(VT.getSimpleVT().SimpleTy+1); 1253 1254 SDNode *&N = VT.isExtended() ? 1255 ExtendedValueTypeNodes[VT] : ValueTypeNodes[VT.getSimpleVT().SimpleTy]; 1256 1257 if (N) return SDValue(N, 0); 1258 N = new (NodeAllocator) VTSDNode(VT); 1259 AllNodes.push_back(N); 1260 return SDValue(N, 0); 1261} 1262 1263SDValue SelectionDAG::getExternalSymbol(const char *Sym, EVT VT) { 1264 SDNode *&N = ExternalSymbols[Sym]; 1265 if (N) return SDValue(N, 0); 1266 N = new (NodeAllocator) ExternalSymbolSDNode(false, Sym, 0, VT); 1267 AllNodes.push_back(N); 1268 return SDValue(N, 0); 1269} 1270 1271SDValue SelectionDAG::getTargetExternalSymbol(const char *Sym, EVT VT, 1272 unsigned char TargetFlags) { 1273 SDNode *&N = 1274 TargetExternalSymbols[std::pair<std::string,unsigned char>(Sym, 1275 TargetFlags)]; 1276 if (N) return SDValue(N, 0); 1277 N = new (NodeAllocator) ExternalSymbolSDNode(true, Sym, TargetFlags, VT); 1278 AllNodes.push_back(N); 1279 return SDValue(N, 0); 1280} 1281 1282SDValue SelectionDAG::getCondCode(ISD::CondCode Cond) { 1283 if ((unsigned)Cond >= CondCodeNodes.size()) 1284 CondCodeNodes.resize(Cond+1); 1285 1286 if (CondCodeNodes[Cond] == 0) { 1287 CondCodeSDNode *N = new (NodeAllocator) CondCodeSDNode(Cond); 1288 CondCodeNodes[Cond] = N; 1289 AllNodes.push_back(N); 1290 } 1291 1292 return SDValue(CondCodeNodes[Cond], 0); 1293} 1294 1295// commuteShuffle - swaps the values of N1 and N2, and swaps all indices in 1296// the shuffle mask M that point at N1 to point at N2, and indices that point 1297// N2 to point at N1. 1298static void commuteShuffle(SDValue &N1, SDValue &N2, SmallVectorImpl<int> &M) { 1299 std::swap(N1, N2); 1300 int NElts = M.size(); 1301 for (int i = 0; i != NElts; ++i) { 1302 if (M[i] >= NElts) 1303 M[i] -= NElts; 1304 else if (M[i] >= 0) 1305 M[i] += NElts; 1306 } 1307} 1308 1309SDValue SelectionDAG::getVectorShuffle(EVT VT, DebugLoc dl, SDValue N1, 1310 SDValue N2, const int *Mask) { 1311 assert(N1.getValueType() == N2.getValueType() && "Invalid VECTOR_SHUFFLE"); 1312 assert(VT.isVector() && N1.getValueType().isVector() && 1313 "Vector Shuffle VTs must be a vectors"); 1314 assert(VT.getVectorElementType() == N1.getValueType().getVectorElementType() 1315 && "Vector Shuffle VTs must have same element type"); 1316 1317 // Canonicalize shuffle undef, undef -> undef 1318 if (N1.getOpcode() == ISD::UNDEF && N2.getOpcode() == ISD::UNDEF) 1319 return getUNDEF(VT); 1320 1321 // Validate that all indices in Mask are within the range of the elements 1322 // input to the shuffle. 1323 unsigned NElts = VT.getVectorNumElements(); 1324 SmallVector<int, 8> MaskVec; 1325 for (unsigned i = 0; i != NElts; ++i) { 1326 assert(Mask[i] < (int)(NElts * 2) && "Index out of range"); 1327 MaskVec.push_back(Mask[i]); 1328 } 1329 1330 // Canonicalize shuffle v, v -> v, undef 1331 if (N1 == N2) { 1332 N2 = getUNDEF(VT); 1333 for (unsigned i = 0; i != NElts; ++i) 1334 if (MaskVec[i] >= (int)NElts) MaskVec[i] -= NElts; 1335 } 1336 1337 // Canonicalize shuffle undef, v -> v, undef. Commute the shuffle mask. 1338 if (N1.getOpcode() == ISD::UNDEF) 1339 commuteShuffle(N1, N2, MaskVec); 1340 1341 // Canonicalize all index into lhs, -> shuffle lhs, undef 1342 // Canonicalize all index into rhs, -> shuffle rhs, undef 1343 bool AllLHS = true, AllRHS = true; 1344 bool N2Undef = N2.getOpcode() == ISD::UNDEF; 1345 for (unsigned i = 0; i != NElts; ++i) { 1346 if (MaskVec[i] >= (int)NElts) { 1347 if (N2Undef) 1348 MaskVec[i] = -1; 1349 else 1350 AllLHS = false; 1351 } else if (MaskVec[i] >= 0) { 1352 AllRHS = false; 1353 } 1354 } 1355 if (AllLHS && AllRHS) 1356 return getUNDEF(VT); 1357 if (AllLHS && !N2Undef) 1358 N2 = getUNDEF(VT); 1359 if (AllRHS) { 1360 N1 = getUNDEF(VT); 1361 commuteShuffle(N1, N2, MaskVec); 1362 } 1363 1364 // If Identity shuffle, or all shuffle in to undef, return that node. 1365 bool AllUndef = true; 1366 bool Identity = true; 1367 for (unsigned i = 0; i != NElts; ++i) { 1368 if (MaskVec[i] >= 0 && MaskVec[i] != (int)i) Identity = false; 1369 if (MaskVec[i] >= 0) AllUndef = false; 1370 } 1371 if (Identity && NElts == N1.getValueType().getVectorNumElements()) 1372 return N1; 1373 if (AllUndef) 1374 return getUNDEF(VT); 1375 1376 FoldingSetNodeID ID; 1377 SDValue Ops[2] = { N1, N2 }; 1378 AddNodeIDNode(ID, ISD::VECTOR_SHUFFLE, getVTList(VT), Ops, 2); 1379 for (unsigned i = 0; i != NElts; ++i) 1380 ID.AddInteger(MaskVec[i]); 1381 1382 void* IP = 0; 1383 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 1384 return SDValue(E, 0); 1385 1386 // Allocate the mask array for the node out of the BumpPtrAllocator, since 1387 // SDNode doesn't have access to it. This memory will be "leaked" when 1388 // the node is deallocated, but recovered when the NodeAllocator is released. 1389 int *MaskAlloc = OperandAllocator.Allocate<int>(NElts); 1390 memcpy(MaskAlloc, &MaskVec[0], NElts * sizeof(int)); 1391 1392 ShuffleVectorSDNode *N = 1393 new (NodeAllocator) ShuffleVectorSDNode(VT, dl, N1, N2, MaskAlloc); 1394 CSEMap.InsertNode(N, IP); 1395 AllNodes.push_back(N); 1396 return SDValue(N, 0); 1397} 1398 1399SDValue SelectionDAG::getConvertRndSat(EVT VT, DebugLoc dl, 1400 SDValue Val, SDValue DTy, 1401 SDValue STy, SDValue Rnd, SDValue Sat, 1402 ISD::CvtCode Code) { 1403 // If the src and dest types are the same and the conversion is between 1404 // integer types of the same sign or two floats, no conversion is necessary. 1405 if (DTy == STy && 1406 (Code == ISD::CVT_UU || Code == ISD::CVT_SS || Code == ISD::CVT_FF)) 1407 return Val; 1408 1409 FoldingSetNodeID ID; 1410 SDValue Ops[] = { Val, DTy, STy, Rnd, Sat }; 1411 AddNodeIDNode(ID, ISD::CONVERT_RNDSAT, getVTList(VT), &Ops[0], 5); 1412 void* IP = 0; 1413 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 1414 return SDValue(E, 0); 1415 1416 CvtRndSatSDNode *N = new (NodeAllocator) CvtRndSatSDNode(VT, dl, Ops, 5, 1417 Code); 1418 CSEMap.InsertNode(N, IP); 1419 AllNodes.push_back(N); 1420 return SDValue(N, 0); 1421} 1422 1423SDValue SelectionDAG::getRegister(unsigned RegNo, EVT VT) { 1424 FoldingSetNodeID ID; 1425 AddNodeIDNode(ID, ISD::Register, getVTList(VT), 0, 0); 1426 ID.AddInteger(RegNo); 1427 void *IP = 0; 1428 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 1429 return SDValue(E, 0); 1430 1431 SDNode *N = new (NodeAllocator) RegisterSDNode(RegNo, VT); 1432 CSEMap.InsertNode(N, IP); 1433 AllNodes.push_back(N); 1434 return SDValue(N, 0); 1435} 1436 1437SDValue SelectionDAG::getRegisterMask(const uint32_t *RegMask) { 1438 FoldingSetNodeID ID; 1439 AddNodeIDNode(ID, ISD::RegisterMask, getVTList(MVT::Untyped), 0, 0); 1440 ID.AddPointer(RegMask); 1441 void *IP = 0; 1442 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 1443 return SDValue(E, 0); 1444 1445 SDNode *N = new (NodeAllocator) RegisterMaskSDNode(RegMask); 1446 CSEMap.InsertNode(N, IP); 1447 AllNodes.push_back(N); 1448 return SDValue(N, 0); 1449} 1450 1451SDValue SelectionDAG::getEHLabel(DebugLoc dl, SDValue Root, MCSymbol *Label) { 1452 FoldingSetNodeID ID; 1453 SDValue Ops[] = { Root }; 1454 AddNodeIDNode(ID, ISD::EH_LABEL, getVTList(MVT::Other), &Ops[0], 1); 1455 ID.AddPointer(Label); 1456 void *IP = 0; 1457 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 1458 return SDValue(E, 0); 1459 1460 SDNode *N = new (NodeAllocator) EHLabelSDNode(dl, Root, Label); 1461 CSEMap.InsertNode(N, IP); 1462 AllNodes.push_back(N); 1463 return SDValue(N, 0); 1464} 1465 1466 1467SDValue SelectionDAG::getBlockAddress(const BlockAddress *BA, EVT VT, 1468 int64_t Offset, 1469 bool isTarget, 1470 unsigned char TargetFlags) { 1471 unsigned Opc = isTarget ? ISD::TargetBlockAddress : ISD::BlockAddress; 1472 1473 FoldingSetNodeID ID; 1474 AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0); 1475 ID.AddPointer(BA); 1476 ID.AddInteger(Offset); 1477 ID.AddInteger(TargetFlags); 1478 void *IP = 0; 1479 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 1480 return SDValue(E, 0); 1481 1482 SDNode *N = new (NodeAllocator) BlockAddressSDNode(Opc, VT, BA, Offset, 1483 TargetFlags); 1484 CSEMap.InsertNode(N, IP); 1485 AllNodes.push_back(N); 1486 return SDValue(N, 0); 1487} 1488 1489SDValue SelectionDAG::getSrcValue(const Value *V) { 1490 assert((!V || V->getType()->isPointerTy()) && 1491 "SrcValue is not a pointer?"); 1492 1493 FoldingSetNodeID ID; 1494 AddNodeIDNode(ID, ISD::SRCVALUE, getVTList(MVT::Other), 0, 0); 1495 ID.AddPointer(V); 1496 1497 void *IP = 0; 1498 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 1499 return SDValue(E, 0); 1500 1501 SDNode *N = new (NodeAllocator) SrcValueSDNode(V); 1502 CSEMap.InsertNode(N, IP); 1503 AllNodes.push_back(N); 1504 return SDValue(N, 0); 1505} 1506 1507/// getMDNode - Return an MDNodeSDNode which holds an MDNode. 1508SDValue SelectionDAG::getMDNode(const MDNode *MD) { 1509 FoldingSetNodeID ID; 1510 AddNodeIDNode(ID, ISD::MDNODE_SDNODE, getVTList(MVT::Other), 0, 0); 1511 ID.AddPointer(MD); 1512 1513 void *IP = 0; 1514 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 1515 return SDValue(E, 0); 1516 1517 SDNode *N = new (NodeAllocator) MDNodeSDNode(MD); 1518 CSEMap.InsertNode(N, IP); 1519 AllNodes.push_back(N); 1520 return SDValue(N, 0); 1521} 1522 1523 1524/// getShiftAmountOperand - Return the specified value casted to 1525/// the target's desired shift amount type. 1526SDValue SelectionDAG::getShiftAmountOperand(EVT LHSTy, SDValue Op) { 1527 EVT OpTy = Op.getValueType(); 1528 MVT ShTy = TLI.getShiftAmountTy(LHSTy); 1529 if (OpTy == ShTy || OpTy.isVector()) return Op; 1530 1531 ISD::NodeType Opcode = OpTy.bitsGT(ShTy) ? ISD::TRUNCATE : ISD::ZERO_EXTEND; 1532 return getNode(Opcode, Op.getDebugLoc(), ShTy, Op); 1533} 1534 1535/// CreateStackTemporary - Create a stack temporary, suitable for holding the 1536/// specified value type. 1537SDValue SelectionDAG::CreateStackTemporary(EVT VT, unsigned minAlign) { 1538 MachineFrameInfo *FrameInfo = getMachineFunction().getFrameInfo(); 1539 unsigned ByteSize = VT.getStoreSize(); 1540 Type *Ty = VT.getTypeForEVT(*getContext()); 1541 unsigned StackAlign = 1542 std::max((unsigned)TLI.getDataLayout()->getPrefTypeAlignment(Ty), minAlign); 1543 1544 int FrameIdx = FrameInfo->CreateStackObject(ByteSize, StackAlign, false); 1545 return getFrameIndex(FrameIdx, TLI.getPointerTy()); 1546} 1547 1548/// CreateStackTemporary - Create a stack temporary suitable for holding 1549/// either of the specified value types. 1550SDValue SelectionDAG::CreateStackTemporary(EVT VT1, EVT VT2) { 1551 unsigned Bytes = std::max(VT1.getStoreSizeInBits(), 1552 VT2.getStoreSizeInBits())/8; 1553 Type *Ty1 = VT1.getTypeForEVT(*getContext()); 1554 Type *Ty2 = VT2.getTypeForEVT(*getContext()); 1555 const DataLayout *TD = TLI.getDataLayout(); 1556 unsigned Align = std::max(TD->getPrefTypeAlignment(Ty1), 1557 TD->getPrefTypeAlignment(Ty2)); 1558 1559 MachineFrameInfo *FrameInfo = getMachineFunction().getFrameInfo(); 1560 int FrameIdx = FrameInfo->CreateStackObject(Bytes, Align, false); 1561 return getFrameIndex(FrameIdx, TLI.getPointerTy()); 1562} 1563 1564SDValue SelectionDAG::FoldSetCC(EVT VT, SDValue N1, 1565 SDValue N2, ISD::CondCode Cond, DebugLoc dl) { 1566 // These setcc operations always fold. 1567 switch (Cond) { 1568 default: break; 1569 case ISD::SETFALSE: 1570 case ISD::SETFALSE2: return getConstant(0, VT); 1571 case ISD::SETTRUE: 1572 case ISD::SETTRUE2: return getConstant(1, VT); 1573 1574 case ISD::SETOEQ: 1575 case ISD::SETOGT: 1576 case ISD::SETOGE: 1577 case ISD::SETOLT: 1578 case ISD::SETOLE: 1579 case ISD::SETONE: 1580 case ISD::SETO: 1581 case ISD::SETUO: 1582 case ISD::SETUEQ: 1583 case ISD::SETUNE: 1584 assert(!N1.getValueType().isInteger() && "Illegal setcc for integer!"); 1585 break; 1586 } 1587 1588 if (ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.getNode())) { 1589 const APInt &C2 = N2C->getAPIntValue(); 1590 if (ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.getNode())) { 1591 const APInt &C1 = N1C->getAPIntValue(); 1592 1593 switch (Cond) { 1594 default: llvm_unreachable("Unknown integer setcc!"); 1595 case ISD::SETEQ: return getConstant(C1 == C2, VT); 1596 case ISD::SETNE: return getConstant(C1 != C2, VT); 1597 case ISD::SETULT: return getConstant(C1.ult(C2), VT); 1598 case ISD::SETUGT: return getConstant(C1.ugt(C2), VT); 1599 case ISD::SETULE: return getConstant(C1.ule(C2), VT); 1600 case ISD::SETUGE: return getConstant(C1.uge(C2), VT); 1601 case ISD::SETLT: return getConstant(C1.slt(C2), VT); 1602 case ISD::SETGT: return getConstant(C1.sgt(C2), VT); 1603 case ISD::SETLE: return getConstant(C1.sle(C2), VT); 1604 case ISD::SETGE: return getConstant(C1.sge(C2), VT); 1605 } 1606 } 1607 } 1608 if (ConstantFPSDNode *N1C = dyn_cast<ConstantFPSDNode>(N1.getNode())) { 1609 if (ConstantFPSDNode *N2C = dyn_cast<ConstantFPSDNode>(N2.getNode())) { 1610 APFloat::cmpResult R = N1C->getValueAPF().compare(N2C->getValueAPF()); 1611 switch (Cond) { 1612 default: break; 1613 case ISD::SETEQ: if (R==APFloat::cmpUnordered) 1614 return getUNDEF(VT); 1615 // fall through 1616 case ISD::SETOEQ: return getConstant(R==APFloat::cmpEqual, VT); 1617 case ISD::SETNE: if (R==APFloat::cmpUnordered) 1618 return getUNDEF(VT); 1619 // fall through 1620 case ISD::SETONE: return getConstant(R==APFloat::cmpGreaterThan || 1621 R==APFloat::cmpLessThan, VT); 1622 case ISD::SETLT: if (R==APFloat::cmpUnordered) 1623 return getUNDEF(VT); 1624 // fall through 1625 case ISD::SETOLT: return getConstant(R==APFloat::cmpLessThan, VT); 1626 case ISD::SETGT: if (R==APFloat::cmpUnordered) 1627 return getUNDEF(VT); 1628 // fall through 1629 case ISD::SETOGT: return getConstant(R==APFloat::cmpGreaterThan, VT); 1630 case ISD::SETLE: if (R==APFloat::cmpUnordered) 1631 return getUNDEF(VT); 1632 // fall through 1633 case ISD::SETOLE: return getConstant(R==APFloat::cmpLessThan || 1634 R==APFloat::cmpEqual, VT); 1635 case ISD::SETGE: if (R==APFloat::cmpUnordered) 1636 return getUNDEF(VT); 1637 // fall through 1638 case ISD::SETOGE: return getConstant(R==APFloat::cmpGreaterThan || 1639 R==APFloat::cmpEqual, VT); 1640 case ISD::SETO: return getConstant(R!=APFloat::cmpUnordered, VT); 1641 case ISD::SETUO: return getConstant(R==APFloat::cmpUnordered, VT); 1642 case ISD::SETUEQ: return getConstant(R==APFloat::cmpUnordered || 1643 R==APFloat::cmpEqual, VT); 1644 case ISD::SETUNE: return getConstant(R!=APFloat::cmpEqual, VT); 1645 case ISD::SETULT: return getConstant(R==APFloat::cmpUnordered || 1646 R==APFloat::cmpLessThan, VT); 1647 case ISD::SETUGT: return getConstant(R==APFloat::cmpGreaterThan || 1648 R==APFloat::cmpUnordered, VT); 1649 case ISD::SETULE: return getConstant(R!=APFloat::cmpGreaterThan, VT); 1650 case ISD::SETUGE: return getConstant(R!=APFloat::cmpLessThan, VT); 1651 } 1652 } else { 1653 // Ensure that the constant occurs on the RHS. 1654 return getSetCC(dl, VT, N2, N1, ISD::getSetCCSwappedOperands(Cond)); 1655 } 1656 } 1657 1658 // Could not fold it. 1659 return SDValue(); 1660} 1661 1662/// SignBitIsZero - Return true if the sign bit of Op is known to be zero. We 1663/// use this predicate to simplify operations downstream. 1664bool SelectionDAG::SignBitIsZero(SDValue Op, unsigned Depth) const { 1665 // This predicate is not safe for vector operations. 1666 if (Op.getValueType().isVector()) 1667 return false; 1668 1669 unsigned BitWidth = Op.getValueType().getScalarType().getSizeInBits(); 1670 return MaskedValueIsZero(Op, APInt::getSignBit(BitWidth), Depth); 1671} 1672 1673/// MaskedValueIsZero - Return true if 'V & Mask' is known to be zero. We use 1674/// this predicate to simplify operations downstream. Mask is known to be zero 1675/// for bits that V cannot have. 1676bool SelectionDAG::MaskedValueIsZero(SDValue Op, const APInt &Mask, 1677 unsigned Depth) const { 1678 APInt KnownZero, KnownOne; 1679 ComputeMaskedBits(Op, KnownZero, KnownOne, Depth); 1680 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?"); 1681 return (KnownZero & Mask) == Mask; 1682} 1683 1684/// ComputeMaskedBits - Determine which of the bits specified in Mask are 1685/// known to be either zero or one and return them in the KnownZero/KnownOne 1686/// bitsets. This code only analyzes bits in Mask, in order to short-circuit 1687/// processing. 1688void SelectionDAG::ComputeMaskedBits(SDValue Op, APInt &KnownZero, 1689 APInt &KnownOne, unsigned Depth) const { 1690 unsigned BitWidth = Op.getValueType().getScalarType().getSizeInBits(); 1691 1692 KnownZero = KnownOne = APInt(BitWidth, 0); // Don't know anything. 1693 if (Depth == 6) 1694 return; // Limit search depth. 1695 1696 APInt KnownZero2, KnownOne2; 1697 1698 switch (Op.getOpcode()) { 1699 case ISD::Constant: 1700 // We know all of the bits for a constant! 1701 KnownOne = cast<ConstantSDNode>(Op)->getAPIntValue(); 1702 KnownZero = ~KnownOne; 1703 return; 1704 case ISD::AND: 1705 // If either the LHS or the RHS are Zero, the result is zero. 1706 ComputeMaskedBits(Op.getOperand(1), KnownZero, KnownOne, Depth+1); 1707 ComputeMaskedBits(Op.getOperand(0), KnownZero2, KnownOne2, Depth+1); 1708 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?"); 1709 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?"); 1710 1711 // Output known-1 bits are only known if set in both the LHS & RHS. 1712 KnownOne &= KnownOne2; 1713 // Output known-0 are known to be clear if zero in either the LHS | RHS. 1714 KnownZero |= KnownZero2; 1715 return; 1716 case ISD::OR: 1717 ComputeMaskedBits(Op.getOperand(1), KnownZero, KnownOne, Depth+1); 1718 ComputeMaskedBits(Op.getOperand(0), KnownZero2, KnownOne2, Depth+1); 1719 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?"); 1720 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?"); 1721 1722 // Output known-0 bits are only known if clear in both the LHS & RHS. 1723 KnownZero &= KnownZero2; 1724 // Output known-1 are known to be set if set in either the LHS | RHS. 1725 KnownOne |= KnownOne2; 1726 return; 1727 case ISD::XOR: { 1728 ComputeMaskedBits(Op.getOperand(1), KnownZero, KnownOne, Depth+1); 1729 ComputeMaskedBits(Op.getOperand(0), KnownZero2, KnownOne2, Depth+1); 1730 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?"); 1731 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?"); 1732 1733 // Output known-0 bits are known if clear or set in both the LHS & RHS. 1734 APInt KnownZeroOut = (KnownZero & KnownZero2) | (KnownOne & KnownOne2); 1735 // Output known-1 are known to be set if set in only one of the LHS, RHS. 1736 KnownOne = (KnownZero & KnownOne2) | (KnownOne & KnownZero2); 1737 KnownZero = KnownZeroOut; 1738 return; 1739 } 1740 case ISD::MUL: { 1741 ComputeMaskedBits(Op.getOperand(1), KnownZero, KnownOne, Depth+1); 1742 ComputeMaskedBits(Op.getOperand(0), KnownZero2, KnownOne2, Depth+1); 1743 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?"); 1744 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?"); 1745 1746 // If low bits are zero in either operand, output low known-0 bits. 1747 // Also compute a conserative estimate for high known-0 bits. 1748 // More trickiness is possible, but this is sufficient for the 1749 // interesting case of alignment computation. 1750 KnownOne.clearAllBits(); 1751 unsigned TrailZ = KnownZero.countTrailingOnes() + 1752 KnownZero2.countTrailingOnes(); 1753 unsigned LeadZ = std::max(KnownZero.countLeadingOnes() + 1754 KnownZero2.countLeadingOnes(), 1755 BitWidth) - BitWidth; 1756 1757 TrailZ = std::min(TrailZ, BitWidth); 1758 LeadZ = std::min(LeadZ, BitWidth); 1759 KnownZero = APInt::getLowBitsSet(BitWidth, TrailZ) | 1760 APInt::getHighBitsSet(BitWidth, LeadZ); 1761 return; 1762 } 1763 case ISD::UDIV: { 1764 // For the purposes of computing leading zeros we can conservatively 1765 // treat a udiv as a logical right shift by the power of 2 known to 1766 // be less than the denominator. 1767 ComputeMaskedBits(Op.getOperand(0), KnownZero2, KnownOne2, Depth+1); 1768 unsigned LeadZ = KnownZero2.countLeadingOnes(); 1769 1770 KnownOne2.clearAllBits(); 1771 KnownZero2.clearAllBits(); 1772 ComputeMaskedBits(Op.getOperand(1), KnownZero2, KnownOne2, Depth+1); 1773 unsigned RHSUnknownLeadingOnes = KnownOne2.countLeadingZeros(); 1774 if (RHSUnknownLeadingOnes != BitWidth) 1775 LeadZ = std::min(BitWidth, 1776 LeadZ + BitWidth - RHSUnknownLeadingOnes - 1); 1777 1778 KnownZero = APInt::getHighBitsSet(BitWidth, LeadZ); 1779 return; 1780 } 1781 case ISD::SELECT: 1782 ComputeMaskedBits(Op.getOperand(2), KnownZero, KnownOne, Depth+1); 1783 ComputeMaskedBits(Op.getOperand(1), KnownZero2, KnownOne2, Depth+1); 1784 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?"); 1785 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?"); 1786 1787 // Only known if known in both the LHS and RHS. 1788 KnownOne &= KnownOne2; 1789 KnownZero &= KnownZero2; 1790 return; 1791 case ISD::SELECT_CC: 1792 ComputeMaskedBits(Op.getOperand(3), KnownZero, KnownOne, Depth+1); 1793 ComputeMaskedBits(Op.getOperand(2), KnownZero2, KnownOne2, Depth+1); 1794 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?"); 1795 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?"); 1796 1797 // Only known if known in both the LHS and RHS. 1798 KnownOne &= KnownOne2; 1799 KnownZero &= KnownZero2; 1800 return; 1801 case ISD::SADDO: 1802 case ISD::UADDO: 1803 case ISD::SSUBO: 1804 case ISD::USUBO: 1805 case ISD::SMULO: 1806 case ISD::UMULO: 1807 if (Op.getResNo() != 1) 1808 return; 1809 // The boolean result conforms to getBooleanContents. Fall through. 1810 case ISD::SETCC: 1811 // If we know the result of a setcc has the top bits zero, use this info. 1812 if (TLI.getBooleanContents(Op.getValueType().isVector()) == 1813 TargetLowering::ZeroOrOneBooleanContent && BitWidth > 1) 1814 KnownZero |= APInt::getHighBitsSet(BitWidth, BitWidth - 1); 1815 return; 1816 case ISD::SHL: 1817 // (shl X, C1) & C2 == 0 iff (X & C2 >>u C1) == 0 1818 if (ConstantSDNode *SA = dyn_cast<ConstantSDNode>(Op.getOperand(1))) { 1819 unsigned ShAmt = SA->getZExtValue(); 1820 1821 // If the shift count is an invalid immediate, don't do anything. 1822 if (ShAmt >= BitWidth) 1823 return; 1824 1825 ComputeMaskedBits(Op.getOperand(0), KnownZero, KnownOne, Depth+1); 1826 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?"); 1827 KnownZero <<= ShAmt; 1828 KnownOne <<= ShAmt; 1829 // low bits known zero. 1830 KnownZero |= APInt::getLowBitsSet(BitWidth, ShAmt); 1831 } 1832 return; 1833 case ISD::SRL: 1834 // (ushr X, C1) & C2 == 0 iff (-1 >> C1) & C2 == 0 1835 if (ConstantSDNode *SA = dyn_cast<ConstantSDNode>(Op.getOperand(1))) { 1836 unsigned ShAmt = SA->getZExtValue(); 1837 1838 // If the shift count is an invalid immediate, don't do anything. 1839 if (ShAmt >= BitWidth) 1840 return; 1841 1842 ComputeMaskedBits(Op.getOperand(0), KnownZero, KnownOne, Depth+1); 1843 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?"); 1844 KnownZero = KnownZero.lshr(ShAmt); 1845 KnownOne = KnownOne.lshr(ShAmt); 1846 1847 APInt HighBits = APInt::getHighBitsSet(BitWidth, ShAmt); 1848 KnownZero |= HighBits; // High bits known zero. 1849 } 1850 return; 1851 case ISD::SRA: 1852 if (ConstantSDNode *SA = dyn_cast<ConstantSDNode>(Op.getOperand(1))) { 1853 unsigned ShAmt = SA->getZExtValue(); 1854 1855 // If the shift count is an invalid immediate, don't do anything. 1856 if (ShAmt >= BitWidth) 1857 return; 1858 1859 // If any of the demanded bits are produced by the sign extension, we also 1860 // demand the input sign bit. 1861 APInt HighBits = APInt::getHighBitsSet(BitWidth, ShAmt); 1862 1863 ComputeMaskedBits(Op.getOperand(0), KnownZero, KnownOne, Depth+1); 1864 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?"); 1865 KnownZero = KnownZero.lshr(ShAmt); 1866 KnownOne = KnownOne.lshr(ShAmt); 1867 1868 // Handle the sign bits. 1869 APInt SignBit = APInt::getSignBit(BitWidth); 1870 SignBit = SignBit.lshr(ShAmt); // Adjust to where it is now in the mask. 1871 1872 if (KnownZero.intersects(SignBit)) { 1873 KnownZero |= HighBits; // New bits are known zero. 1874 } else if (KnownOne.intersects(SignBit)) { 1875 KnownOne |= HighBits; // New bits are known one. 1876 } 1877 } 1878 return; 1879 case ISD::SIGN_EXTEND_INREG: { 1880 EVT EVT = cast<VTSDNode>(Op.getOperand(1))->getVT(); 1881 unsigned EBits = EVT.getScalarType().getSizeInBits(); 1882 1883 // Sign extension. Compute the demanded bits in the result that are not 1884 // present in the input. 1885 APInt NewBits = APInt::getHighBitsSet(BitWidth, BitWidth - EBits); 1886 1887 APInt InSignBit = APInt::getSignBit(EBits); 1888 APInt InputDemandedBits = APInt::getLowBitsSet(BitWidth, EBits); 1889 1890 // If the sign extended bits are demanded, we know that the sign 1891 // bit is demanded. 1892 InSignBit = InSignBit.zext(BitWidth); 1893 if (NewBits.getBoolValue()) 1894 InputDemandedBits |= InSignBit; 1895 1896 ComputeMaskedBits(Op.getOperand(0), KnownZero, KnownOne, Depth+1); 1897 KnownOne &= InputDemandedBits; 1898 KnownZero &= InputDemandedBits; 1899 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?"); 1900 1901 // If the sign bit of the input is known set or clear, then we know the 1902 // top bits of the result. 1903 if (KnownZero.intersects(InSignBit)) { // Input sign bit known clear 1904 KnownZero |= NewBits; 1905 KnownOne &= ~NewBits; 1906 } else if (KnownOne.intersects(InSignBit)) { // Input sign bit known set 1907 KnownOne |= NewBits; 1908 KnownZero &= ~NewBits; 1909 } else { // Input sign bit unknown 1910 KnownZero &= ~NewBits; 1911 KnownOne &= ~NewBits; 1912 } 1913 return; 1914 } 1915 case ISD::CTTZ: 1916 case ISD::CTTZ_ZERO_UNDEF: 1917 case ISD::CTLZ: 1918 case ISD::CTLZ_ZERO_UNDEF: 1919 case ISD::CTPOP: { 1920 unsigned LowBits = Log2_32(BitWidth)+1; 1921 KnownZero = APInt::getHighBitsSet(BitWidth, BitWidth - LowBits); 1922 KnownOne.clearAllBits(); 1923 return; 1924 } 1925 case ISD::LOAD: { 1926 LoadSDNode *LD = cast<LoadSDNode>(Op); 1927 if (ISD::isZEXTLoad(Op.getNode())) { 1928 EVT VT = LD->getMemoryVT(); 1929 unsigned MemBits = VT.getScalarType().getSizeInBits(); 1930 KnownZero |= APInt::getHighBitsSet(BitWidth, BitWidth - MemBits); 1931 } else if (const MDNode *Ranges = LD->getRanges()) { 1932 computeMaskedBitsLoad(*Ranges, KnownZero); 1933 } 1934 return; 1935 } 1936 case ISD::ZERO_EXTEND: { 1937 EVT InVT = Op.getOperand(0).getValueType(); 1938 unsigned InBits = InVT.getScalarType().getSizeInBits(); 1939 APInt NewBits = APInt::getHighBitsSet(BitWidth, BitWidth - InBits); 1940 KnownZero = KnownZero.trunc(InBits); 1941 KnownOne = KnownOne.trunc(InBits); 1942 ComputeMaskedBits(Op.getOperand(0), KnownZero, KnownOne, Depth+1); 1943 KnownZero = KnownZero.zext(BitWidth); 1944 KnownOne = KnownOne.zext(BitWidth); 1945 KnownZero |= NewBits; 1946 return; 1947 } 1948 case ISD::SIGN_EXTEND: { 1949 EVT InVT = Op.getOperand(0).getValueType(); 1950 unsigned InBits = InVT.getScalarType().getSizeInBits(); 1951 APInt InSignBit = APInt::getSignBit(InBits); 1952 APInt NewBits = APInt::getHighBitsSet(BitWidth, BitWidth - InBits); 1953 1954 KnownZero = KnownZero.trunc(InBits); 1955 KnownOne = KnownOne.trunc(InBits); 1956 ComputeMaskedBits(Op.getOperand(0), KnownZero, KnownOne, Depth+1); 1957 1958 // Note if the sign bit is known to be zero or one. 1959 bool SignBitKnownZero = KnownZero.isNegative(); 1960 bool SignBitKnownOne = KnownOne.isNegative(); 1961 assert(!(SignBitKnownZero && SignBitKnownOne) && 1962 "Sign bit can't be known to be both zero and one!"); 1963 1964 KnownZero = KnownZero.zext(BitWidth); 1965 KnownOne = KnownOne.zext(BitWidth); 1966 1967 // If the sign bit is known zero or one, the top bits match. 1968 if (SignBitKnownZero) 1969 KnownZero |= NewBits; 1970 else if (SignBitKnownOne) 1971 KnownOne |= NewBits; 1972 return; 1973 } 1974 case ISD::ANY_EXTEND: { 1975 EVT InVT = Op.getOperand(0).getValueType(); 1976 unsigned InBits = InVT.getScalarType().getSizeInBits(); 1977 KnownZero = KnownZero.trunc(InBits); 1978 KnownOne = KnownOne.trunc(InBits); 1979 ComputeMaskedBits(Op.getOperand(0), KnownZero, KnownOne, Depth+1); 1980 KnownZero = KnownZero.zext(BitWidth); 1981 KnownOne = KnownOne.zext(BitWidth); 1982 return; 1983 } 1984 case ISD::TRUNCATE: { 1985 EVT InVT = Op.getOperand(0).getValueType(); 1986 unsigned InBits = InVT.getScalarType().getSizeInBits(); 1987 KnownZero = KnownZero.zext(InBits); 1988 KnownOne = KnownOne.zext(InBits); 1989 ComputeMaskedBits(Op.getOperand(0), KnownZero, KnownOne, Depth+1); 1990 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?"); 1991 KnownZero = KnownZero.trunc(BitWidth); 1992 KnownOne = KnownOne.trunc(BitWidth); 1993 break; 1994 } 1995 case ISD::AssertZext: { 1996 EVT VT = cast<VTSDNode>(Op.getOperand(1))->getVT(); 1997 APInt InMask = APInt::getLowBitsSet(BitWidth, VT.getSizeInBits()); 1998 ComputeMaskedBits(Op.getOperand(0), KnownZero, KnownOne, Depth+1); 1999 KnownZero |= (~InMask); 2000 KnownOne &= (~KnownZero); 2001 return; 2002 } 2003 case ISD::FGETSIGN: 2004 // All bits are zero except the low bit. 2005 KnownZero = APInt::getHighBitsSet(BitWidth, BitWidth - 1); 2006 return; 2007 2008 case ISD::SUB: { 2009 if (ConstantSDNode *CLHS = dyn_cast<ConstantSDNode>(Op.getOperand(0))) { 2010 // We know that the top bits of C-X are clear if X contains less bits 2011 // than C (i.e. no wrap-around can happen). For example, 20-X is 2012 // positive if we can prove that X is >= 0 and < 16. 2013 if (CLHS->getAPIntValue().isNonNegative()) { 2014 unsigned NLZ = (CLHS->getAPIntValue()+1).countLeadingZeros(); 2015 // NLZ can't be BitWidth with no sign bit 2016 APInt MaskV = APInt::getHighBitsSet(BitWidth, NLZ+1); 2017 ComputeMaskedBits(Op.getOperand(1), KnownZero2, KnownOne2, Depth+1); 2018 2019 // If all of the MaskV bits are known to be zero, then we know the 2020 // output top bits are zero, because we now know that the output is 2021 // from [0-C]. 2022 if ((KnownZero2 & MaskV) == MaskV) { 2023 unsigned NLZ2 = CLHS->getAPIntValue().countLeadingZeros(); 2024 // Top bits known zero. 2025 KnownZero = APInt::getHighBitsSet(BitWidth, NLZ2); 2026 } 2027 } 2028 } 2029 } 2030 // fall through 2031 case ISD::ADD: 2032 case ISD::ADDE: { 2033 // Output known-0 bits are known if clear or set in both the low clear bits 2034 // common to both LHS & RHS. For example, 8+(X<<3) is known to have the 2035 // low 3 bits clear. 2036 ComputeMaskedBits(Op.getOperand(0), KnownZero2, KnownOne2, Depth+1); 2037 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?"); 2038 unsigned KnownZeroOut = KnownZero2.countTrailingOnes(); 2039 2040 ComputeMaskedBits(Op.getOperand(1), KnownZero2, KnownOne2, Depth+1); 2041 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?"); 2042 KnownZeroOut = std::min(KnownZeroOut, 2043 KnownZero2.countTrailingOnes()); 2044 2045 if (Op.getOpcode() == ISD::ADD) { 2046 KnownZero |= APInt::getLowBitsSet(BitWidth, KnownZeroOut); 2047 return; 2048 } 2049 2050 // With ADDE, a carry bit may be added in, so we can only use this 2051 // information if we know (at least) that the low two bits are clear. We 2052 // then return to the caller that the low bit is unknown but that other bits 2053 // are known zero. 2054 if (KnownZeroOut >= 2) // ADDE 2055 KnownZero |= APInt::getBitsSet(BitWidth, 1, KnownZeroOut); 2056 return; 2057 } 2058 case ISD::SREM: 2059 if (ConstantSDNode *Rem = dyn_cast<ConstantSDNode>(Op.getOperand(1))) { 2060 const APInt &RA = Rem->getAPIntValue().abs(); 2061 if (RA.isPowerOf2()) { 2062 APInt LowBits = RA - 1; 2063 APInt Mask2 = LowBits | APInt::getSignBit(BitWidth); 2064 ComputeMaskedBits(Op.getOperand(0), KnownZero2,KnownOne2,Depth+1); 2065 2066 // The low bits of the first operand are unchanged by the srem. 2067 KnownZero = KnownZero2 & LowBits; 2068 KnownOne = KnownOne2 & LowBits; 2069 2070 // If the first operand is non-negative or has all low bits zero, then 2071 // the upper bits are all zero. 2072 if (KnownZero2[BitWidth-1] || ((KnownZero2 & LowBits) == LowBits)) 2073 KnownZero |= ~LowBits; 2074 2075 // If the first operand is negative and not all low bits are zero, then 2076 // the upper bits are all one. 2077 if (KnownOne2[BitWidth-1] && ((KnownOne2 & LowBits) != 0)) 2078 KnownOne |= ~LowBits; 2079 assert((KnownZero & KnownOne) == 0&&"Bits known to be one AND zero?"); 2080 } 2081 } 2082 return; 2083 case ISD::UREM: { 2084 if (ConstantSDNode *Rem = dyn_cast<ConstantSDNode>(Op.getOperand(1))) { 2085 const APInt &RA = Rem->getAPIntValue(); 2086 if (RA.isPowerOf2()) { 2087 APInt LowBits = (RA - 1); 2088 KnownZero |= ~LowBits; 2089 ComputeMaskedBits(Op.getOperand(0), KnownZero, KnownOne,Depth+1); 2090 assert((KnownZero & KnownOne) == 0&&"Bits known to be one AND zero?"); 2091 break; 2092 } 2093 } 2094 2095 // Since the result is less than or equal to either operand, any leading 2096 // zero bits in either operand must also exist in the result. 2097 ComputeMaskedBits(Op.getOperand(0), KnownZero, KnownOne, Depth+1); 2098 ComputeMaskedBits(Op.getOperand(1), KnownZero2, KnownOne2, Depth+1); 2099 2100 uint32_t Leaders = std::max(KnownZero.countLeadingOnes(), 2101 KnownZero2.countLeadingOnes()); 2102 KnownOne.clearAllBits(); 2103 KnownZero = APInt::getHighBitsSet(BitWidth, Leaders); 2104 return; 2105 } 2106 case ISD::FrameIndex: 2107 case ISD::TargetFrameIndex: 2108 if (unsigned Align = InferPtrAlignment(Op)) { 2109 // The low bits are known zero if the pointer is aligned. 2110 KnownZero = APInt::getLowBitsSet(BitWidth, Log2_32(Align)); 2111 return; 2112 } 2113 break; 2114 2115 default: 2116 if (Op.getOpcode() < ISD::BUILTIN_OP_END) 2117 break; 2118 // Fallthrough 2119 case ISD::INTRINSIC_WO_CHAIN: 2120 case ISD::INTRINSIC_W_CHAIN: 2121 case ISD::INTRINSIC_VOID: 2122 // Allow the target to implement this method for its nodes. 2123 TLI.computeMaskedBitsForTargetNode(Op, KnownZero, KnownOne, *this, Depth); 2124 return; 2125 } 2126} 2127 2128/// ComputeNumSignBits - Return the number of times the sign bit of the 2129/// register is replicated into the other bits. We know that at least 1 bit 2130/// is always equal to the sign bit (itself), but other cases can give us 2131/// information. For example, immediately after an "SRA X, 2", we know that 2132/// the top 3 bits are all equal to each other, so we return 3. 2133unsigned SelectionDAG::ComputeNumSignBits(SDValue Op, unsigned Depth) const{ 2134 EVT VT = Op.getValueType(); 2135 assert(VT.isInteger() && "Invalid VT!"); 2136 unsigned VTBits = VT.getScalarType().getSizeInBits(); 2137 unsigned Tmp, Tmp2; 2138 unsigned FirstAnswer = 1; 2139 2140 if (Depth == 6) 2141 return 1; // Limit search depth. 2142 2143 switch (Op.getOpcode()) { 2144 default: break; 2145 case ISD::AssertSext: 2146 Tmp = cast<VTSDNode>(Op.getOperand(1))->getVT().getSizeInBits(); 2147 return VTBits-Tmp+1; 2148 case ISD::AssertZext: 2149 Tmp = cast<VTSDNode>(Op.getOperand(1))->getVT().getSizeInBits(); 2150 return VTBits-Tmp; 2151 2152 case ISD::Constant: { 2153 const APInt &Val = cast<ConstantSDNode>(Op)->getAPIntValue(); 2154 return Val.getNumSignBits(); 2155 } 2156 2157 case ISD::SIGN_EXTEND: 2158 Tmp = VTBits-Op.getOperand(0).getValueType().getScalarType().getSizeInBits(); 2159 return ComputeNumSignBits(Op.getOperand(0), Depth+1) + Tmp; 2160 2161 case ISD::SIGN_EXTEND_INREG: 2162 // Max of the input and what this extends. 2163 Tmp = 2164 cast<VTSDNode>(Op.getOperand(1))->getVT().getScalarType().getSizeInBits(); 2165 Tmp = VTBits-Tmp+1; 2166 2167 Tmp2 = ComputeNumSignBits(Op.getOperand(0), Depth+1); 2168 return std::max(Tmp, Tmp2); 2169 2170 case ISD::SRA: 2171 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1); 2172 // SRA X, C -> adds C sign bits. 2173 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) { 2174 Tmp += C->getZExtValue(); 2175 if (Tmp > VTBits) Tmp = VTBits; 2176 } 2177 return Tmp; 2178 case ISD::SHL: 2179 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) { 2180 // shl destroys sign bits. 2181 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1); 2182 if (C->getZExtValue() >= VTBits || // Bad shift. 2183 C->getZExtValue() >= Tmp) break; // Shifted all sign bits out. 2184 return Tmp - C->getZExtValue(); 2185 } 2186 break; 2187 case ISD::AND: 2188 case ISD::OR: 2189 case ISD::XOR: // NOT is handled here. 2190 // Logical binary ops preserve the number of sign bits at the worst. 2191 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1); 2192 if (Tmp != 1) { 2193 Tmp2 = ComputeNumSignBits(Op.getOperand(1), Depth+1); 2194 FirstAnswer = std::min(Tmp, Tmp2); 2195 // We computed what we know about the sign bits as our first 2196 // answer. Now proceed to the generic code that uses 2197 // ComputeMaskedBits, and pick whichever answer is better. 2198 } 2199 break; 2200 2201 case ISD::SELECT: 2202 Tmp = ComputeNumSignBits(Op.getOperand(1), Depth+1); 2203 if (Tmp == 1) return 1; // Early out. 2204 Tmp2 = ComputeNumSignBits(Op.getOperand(2), Depth+1); 2205 return std::min(Tmp, Tmp2); 2206 2207 case ISD::SADDO: 2208 case ISD::UADDO: 2209 case ISD::SSUBO: 2210 case ISD::USUBO: 2211 case ISD::SMULO: 2212 case ISD::UMULO: 2213 if (Op.getResNo() != 1) 2214 break; 2215 // The boolean result conforms to getBooleanContents. Fall through. 2216 case ISD::SETCC: 2217 // If setcc returns 0/-1, all bits are sign bits. 2218 if (TLI.getBooleanContents(Op.getValueType().isVector()) == 2219 TargetLowering::ZeroOrNegativeOneBooleanContent) 2220 return VTBits; 2221 break; 2222 case ISD::ROTL: 2223 case ISD::ROTR: 2224 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) { 2225 unsigned RotAmt = C->getZExtValue() & (VTBits-1); 2226 2227 // Handle rotate right by N like a rotate left by 32-N. 2228 if (Op.getOpcode() == ISD::ROTR) 2229 RotAmt = (VTBits-RotAmt) & (VTBits-1); 2230 2231 // If we aren't rotating out all of the known-in sign bits, return the 2232 // number that are left. This handles rotl(sext(x), 1) for example. 2233 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1); 2234 if (Tmp > RotAmt+1) return Tmp-RotAmt; 2235 } 2236 break; 2237 case ISD::ADD: 2238 // Add can have at most one carry bit. Thus we know that the output 2239 // is, at worst, one more bit than the inputs. 2240 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1); 2241 if (Tmp == 1) return 1; // Early out. 2242 2243 // Special case decrementing a value (ADD X, -1): 2244 if (ConstantSDNode *CRHS = dyn_cast<ConstantSDNode>(Op.getOperand(1))) 2245 if (CRHS->isAllOnesValue()) { 2246 APInt KnownZero, KnownOne; 2247 ComputeMaskedBits(Op.getOperand(0), KnownZero, KnownOne, Depth+1); 2248 2249 // If the input is known to be 0 or 1, the output is 0/-1, which is all 2250 // sign bits set. 2251 if ((KnownZero | APInt(VTBits, 1)).isAllOnesValue()) 2252 return VTBits; 2253 2254 // If we are subtracting one from a positive number, there is no carry 2255 // out of the result. 2256 if (KnownZero.isNegative()) 2257 return Tmp; 2258 } 2259 2260 Tmp2 = ComputeNumSignBits(Op.getOperand(1), Depth+1); 2261 if (Tmp2 == 1) return 1; 2262 return std::min(Tmp, Tmp2)-1; 2263 2264 case ISD::SUB: 2265 Tmp2 = ComputeNumSignBits(Op.getOperand(1), Depth+1); 2266 if (Tmp2 == 1) return 1; 2267 2268 // Handle NEG. 2269 if (ConstantSDNode *CLHS = dyn_cast<ConstantSDNode>(Op.getOperand(0))) 2270 if (CLHS->isNullValue()) { 2271 APInt KnownZero, KnownOne; 2272 ComputeMaskedBits(Op.getOperand(1), KnownZero, KnownOne, Depth+1); 2273 // If the input is known to be 0 or 1, the output is 0/-1, which is all 2274 // sign bits set. 2275 if ((KnownZero | APInt(VTBits, 1)).isAllOnesValue()) 2276 return VTBits; 2277 2278 // If the input is known to be positive (the sign bit is known clear), 2279 // the output of the NEG has the same number of sign bits as the input. 2280 if (KnownZero.isNegative()) 2281 return Tmp2; 2282 2283 // Otherwise, we treat this like a SUB. 2284 } 2285 2286 // Sub can have at most one carry bit. Thus we know that the output 2287 // is, at worst, one more bit than the inputs. 2288 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1); 2289 if (Tmp == 1) return 1; // Early out. 2290 return std::min(Tmp, Tmp2)-1; 2291 case ISD::TRUNCATE: 2292 // FIXME: it's tricky to do anything useful for this, but it is an important 2293 // case for targets like X86. 2294 break; 2295 } 2296 2297 // Handle LOADX separately here. EXTLOAD case will fallthrough. 2298 if (LoadSDNode *LD = dyn_cast<LoadSDNode>(Op)) { 2299 unsigned ExtType = LD->getExtensionType(); 2300 switch (ExtType) { 2301 default: break; 2302 case ISD::SEXTLOAD: // '17' bits known 2303 Tmp = LD->getMemoryVT().getScalarType().getSizeInBits(); 2304 return VTBits-Tmp+1; 2305 case ISD::ZEXTLOAD: // '16' bits known 2306 Tmp = LD->getMemoryVT().getScalarType().getSizeInBits(); 2307 return VTBits-Tmp; 2308 } 2309 } 2310 2311 // Allow the target to implement this method for its nodes. 2312 if (Op.getOpcode() >= ISD::BUILTIN_OP_END || 2313 Op.getOpcode() == ISD::INTRINSIC_WO_CHAIN || 2314 Op.getOpcode() == ISD::INTRINSIC_W_CHAIN || 2315 Op.getOpcode() == ISD::INTRINSIC_VOID) { 2316 unsigned NumBits = TLI.ComputeNumSignBitsForTargetNode(Op, Depth); 2317 if (NumBits > 1) FirstAnswer = std::max(FirstAnswer, NumBits); 2318 } 2319 2320 // Finally, if we can prove that the top bits of the result are 0's or 1's, 2321 // use this information. 2322 APInt KnownZero, KnownOne; 2323 ComputeMaskedBits(Op, KnownZero, KnownOne, Depth); 2324 2325 APInt Mask; 2326 if (KnownZero.isNegative()) { // sign bit is 0 2327 Mask = KnownZero; 2328 } else if (KnownOne.isNegative()) { // sign bit is 1; 2329 Mask = KnownOne; 2330 } else { 2331 // Nothing known. 2332 return FirstAnswer; 2333 } 2334 2335 // Okay, we know that the sign bit in Mask is set. Use CLZ to determine 2336 // the number of identical bits in the top of the input value. 2337 Mask = ~Mask; 2338 Mask <<= Mask.getBitWidth()-VTBits; 2339 // Return # leading zeros. We use 'min' here in case Val was zero before 2340 // shifting. We don't want to return '64' as for an i32 "0". 2341 return std::max(FirstAnswer, std::min(VTBits, Mask.countLeadingZeros())); 2342} 2343 2344/// isBaseWithConstantOffset - Return true if the specified operand is an 2345/// ISD::ADD with a ConstantSDNode on the right-hand side, or if it is an 2346/// ISD::OR with a ConstantSDNode that is guaranteed to have the same 2347/// semantics as an ADD. This handles the equivalence: 2348/// X|Cst == X+Cst iff X&Cst = 0. 2349bool SelectionDAG::isBaseWithConstantOffset(SDValue Op) const { 2350 if ((Op.getOpcode() != ISD::ADD && Op.getOpcode() != ISD::OR) || 2351 !isa<ConstantSDNode>(Op.getOperand(1))) 2352 return false; 2353 2354 if (Op.getOpcode() == ISD::OR && 2355 !MaskedValueIsZero(Op.getOperand(0), 2356 cast<ConstantSDNode>(Op.getOperand(1))->getAPIntValue())) 2357 return false; 2358 2359 return true; 2360} 2361 2362 2363bool SelectionDAG::isKnownNeverNaN(SDValue Op) const { 2364 // If we're told that NaNs won't happen, assume they won't. 2365 if (getTarget().Options.NoNaNsFPMath) 2366 return true; 2367 2368 // If the value is a constant, we can obviously see if it is a NaN or not. 2369 if (const ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(Op)) 2370 return !C->getValueAPF().isNaN(); 2371 2372 // TODO: Recognize more cases here. 2373 2374 return false; 2375} 2376 2377bool SelectionDAG::isKnownNeverZero(SDValue Op) const { 2378 // If the value is a constant, we can obviously see if it is a zero or not. 2379 if (const ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(Op)) 2380 return !C->isZero(); 2381 2382 // TODO: Recognize more cases here. 2383 switch (Op.getOpcode()) { 2384 default: break; 2385 case ISD::OR: 2386 if (const ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) 2387 return !C->isNullValue(); 2388 break; 2389 } 2390 2391 return false; 2392} 2393 2394bool SelectionDAG::isEqualTo(SDValue A, SDValue B) const { 2395 // Check the obvious case. 2396 if (A == B) return true; 2397 2398 // For for negative and positive zero. 2399 if (const ConstantFPSDNode *CA = dyn_cast<ConstantFPSDNode>(A)) 2400 if (const ConstantFPSDNode *CB = dyn_cast<ConstantFPSDNode>(B)) 2401 if (CA->isZero() && CB->isZero()) return true; 2402 2403 // Otherwise they may not be equal. 2404 return false; 2405} 2406 2407/// getNode - Gets or creates the specified node. 2408/// 2409SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, EVT VT) { 2410 FoldingSetNodeID ID; 2411 AddNodeIDNode(ID, Opcode, getVTList(VT), 0, 0); 2412 void *IP = 0; 2413 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 2414 return SDValue(E, 0); 2415 2416 SDNode *N = new (NodeAllocator) SDNode(Opcode, DL, getVTList(VT)); 2417 CSEMap.InsertNode(N, IP); 2418 2419 AllNodes.push_back(N); 2420#ifndef NDEBUG 2421 VerifySDNode(N); 2422#endif 2423 return SDValue(N, 0); 2424} 2425 2426SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, 2427 EVT VT, SDValue Operand) { 2428 // Constant fold unary operations with an integer constant operand. 2429 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Operand.getNode())) { 2430 const APInt &Val = C->getAPIntValue(); 2431 switch (Opcode) { 2432 default: break; 2433 case ISD::SIGN_EXTEND: 2434 return getConstant(Val.sextOrTrunc(VT.getSizeInBits()), VT); 2435 case ISD::ANY_EXTEND: 2436 case ISD::ZERO_EXTEND: 2437 case ISD::TRUNCATE: 2438 return getConstant(Val.zextOrTrunc(VT.getSizeInBits()), VT); 2439 case ISD::UINT_TO_FP: 2440 case ISD::SINT_TO_FP: { 2441 APFloat apf(APInt::getNullValue(VT.getSizeInBits())); 2442 (void)apf.convertFromAPInt(Val, 2443 Opcode==ISD::SINT_TO_FP, 2444 APFloat::rmNearestTiesToEven); 2445 return getConstantFP(apf, VT); 2446 } 2447 case ISD::BITCAST: 2448 if (VT == MVT::f32 && C->getValueType(0) == MVT::i32) 2449 return getConstantFP(APFloat(Val), VT); 2450 else if (VT == MVT::f64 && C->getValueType(0) == MVT::i64) 2451 return getConstantFP(APFloat(Val), VT); 2452 break; 2453 case ISD::BSWAP: 2454 return getConstant(Val.byteSwap(), VT); 2455 case ISD::CTPOP: 2456 return getConstant(Val.countPopulation(), VT); 2457 case ISD::CTLZ: 2458 case ISD::CTLZ_ZERO_UNDEF: 2459 return getConstant(Val.countLeadingZeros(), VT); 2460 case ISD::CTTZ: 2461 case ISD::CTTZ_ZERO_UNDEF: 2462 return getConstant(Val.countTrailingZeros(), VT); 2463 } 2464 } 2465 2466 // Constant fold unary operations with a floating point constant operand. 2467 if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(Operand.getNode())) { 2468 APFloat V = C->getValueAPF(); // make copy 2469 switch (Opcode) { 2470 case ISD::FNEG: 2471 V.changeSign(); 2472 return getConstantFP(V, VT); 2473 case ISD::FABS: 2474 V.clearSign(); 2475 return getConstantFP(V, VT); 2476 case ISD::FCEIL: { 2477 APFloat::opStatus fs = V.roundToIntegral(APFloat::rmTowardPositive); 2478 if (fs == APFloat::opOK || fs == APFloat::opInexact) 2479 return getConstantFP(V, VT); 2480 break; 2481 } 2482 case ISD::FTRUNC: { 2483 APFloat::opStatus fs = V.roundToIntegral(APFloat::rmTowardZero); 2484 if (fs == APFloat::opOK || fs == APFloat::opInexact) 2485 return getConstantFP(V, VT); 2486 break; 2487 } 2488 case ISD::FFLOOR: { 2489 APFloat::opStatus fs = V.roundToIntegral(APFloat::rmTowardNegative); 2490 if (fs == APFloat::opOK || fs == APFloat::opInexact) 2491 return getConstantFP(V, VT); 2492 break; 2493 } 2494 case ISD::FP_EXTEND: { 2495 bool ignored; 2496 // This can return overflow, underflow, or inexact; we don't care. 2497 // FIXME need to be more flexible about rounding mode. 2498 (void)V.convert(*EVTToAPFloatSemantics(VT), 2499 APFloat::rmNearestTiesToEven, &ignored); 2500 return getConstantFP(V, VT); 2501 } 2502 case ISD::FP_TO_SINT: 2503 case ISD::FP_TO_UINT: { 2504 integerPart x[2]; 2505 bool ignored; 2506 assert(integerPartWidth >= 64); 2507 // FIXME need to be more flexible about rounding mode. 2508 APFloat::opStatus s = V.convertToInteger(x, VT.getSizeInBits(), 2509 Opcode==ISD::FP_TO_SINT, 2510 APFloat::rmTowardZero, &ignored); 2511 if (s==APFloat::opInvalidOp) // inexact is OK, in fact usual 2512 break; 2513 APInt api(VT.getSizeInBits(), x); 2514 return getConstant(api, VT); 2515 } 2516 case ISD::BITCAST: 2517 if (VT == MVT::i32 && C->getValueType(0) == MVT::f32) 2518 return getConstant((uint32_t)V.bitcastToAPInt().getZExtValue(), VT); 2519 else if (VT == MVT::i64 && C->getValueType(0) == MVT::f64) 2520 return getConstant(V.bitcastToAPInt().getZExtValue(), VT); 2521 break; 2522 } 2523 } 2524 2525 unsigned OpOpcode = Operand.getNode()->getOpcode(); 2526 switch (Opcode) { 2527 case ISD::TokenFactor: 2528 case ISD::MERGE_VALUES: 2529 case ISD::CONCAT_VECTORS: 2530 return Operand; // Factor, merge or concat of one node? No need. 2531 case ISD::FP_ROUND: llvm_unreachable("Invalid method to make FP_ROUND node"); 2532 case ISD::FP_EXTEND: 2533 assert(VT.isFloatingPoint() && 2534 Operand.getValueType().isFloatingPoint() && "Invalid FP cast!"); 2535 if (Operand.getValueType() == VT) return Operand; // noop conversion. 2536 assert((!VT.isVector() || 2537 VT.getVectorNumElements() == 2538 Operand.getValueType().getVectorNumElements()) && 2539 "Vector element count mismatch!"); 2540 if (Operand.getOpcode() == ISD::UNDEF) 2541 return getUNDEF(VT); 2542 break; 2543 case ISD::SIGN_EXTEND: 2544 assert(VT.isInteger() && Operand.getValueType().isInteger() && 2545 "Invalid SIGN_EXTEND!"); 2546 if (Operand.getValueType() == VT) return Operand; // noop extension 2547 assert(Operand.getValueType().getScalarType().bitsLT(VT.getScalarType()) && 2548 "Invalid sext node, dst < src!"); 2549 assert((!VT.isVector() || 2550 VT.getVectorNumElements() == 2551 Operand.getValueType().getVectorNumElements()) && 2552 "Vector element count mismatch!"); 2553 if (OpOpcode == ISD::SIGN_EXTEND || OpOpcode == ISD::ZERO_EXTEND) 2554 return getNode(OpOpcode, DL, VT, Operand.getNode()->getOperand(0)); 2555 else if (OpOpcode == ISD::UNDEF) 2556 // sext(undef) = 0, because the top bits will all be the same. 2557 return getConstant(0, VT); 2558 break; 2559 case ISD::ZERO_EXTEND: 2560 assert(VT.isInteger() && Operand.getValueType().isInteger() && 2561 "Invalid ZERO_EXTEND!"); 2562 if (Operand.getValueType() == VT) return Operand; // noop extension 2563 assert(Operand.getValueType().getScalarType().bitsLT(VT.getScalarType()) && 2564 "Invalid zext node, dst < src!"); 2565 assert((!VT.isVector() || 2566 VT.getVectorNumElements() == 2567 Operand.getValueType().getVectorNumElements()) && 2568 "Vector element count mismatch!"); 2569 if (OpOpcode == ISD::ZERO_EXTEND) // (zext (zext x)) -> (zext x) 2570 return getNode(ISD::ZERO_EXTEND, DL, VT, 2571 Operand.getNode()->getOperand(0)); 2572 else if (OpOpcode == ISD::UNDEF) 2573 // zext(undef) = 0, because the top bits will be zero. 2574 return getConstant(0, VT); 2575 break; 2576 case ISD::ANY_EXTEND: 2577 assert(VT.isInteger() && Operand.getValueType().isInteger() && 2578 "Invalid ANY_EXTEND!"); 2579 if (Operand.getValueType() == VT) return Operand; // noop extension 2580 assert(Operand.getValueType().getScalarType().bitsLT(VT.getScalarType()) && 2581 "Invalid anyext node, dst < src!"); 2582 assert((!VT.isVector() || 2583 VT.getVectorNumElements() == 2584 Operand.getValueType().getVectorNumElements()) && 2585 "Vector element count mismatch!"); 2586 2587 if (OpOpcode == ISD::ZERO_EXTEND || OpOpcode == ISD::SIGN_EXTEND || 2588 OpOpcode == ISD::ANY_EXTEND) 2589 // (ext (zext x)) -> (zext x) and (ext (sext x)) -> (sext x) 2590 return getNode(OpOpcode, DL, VT, Operand.getNode()->getOperand(0)); 2591 else if (OpOpcode == ISD::UNDEF) 2592 return getUNDEF(VT); 2593 2594 // (ext (trunx x)) -> x 2595 if (OpOpcode == ISD::TRUNCATE) { 2596 SDValue OpOp = Operand.getNode()->getOperand(0); 2597 if (OpOp.getValueType() == VT) 2598 return OpOp; 2599 } 2600 break; 2601 case ISD::TRUNCATE: 2602 assert(VT.isInteger() && Operand.getValueType().isInteger() && 2603 "Invalid TRUNCATE!"); 2604 if (Operand.getValueType() == VT) return Operand; // noop truncate 2605 assert(Operand.getValueType().getScalarType().bitsGT(VT.getScalarType()) && 2606 "Invalid truncate node, src < dst!"); 2607 assert((!VT.isVector() || 2608 VT.getVectorNumElements() == 2609 Operand.getValueType().getVectorNumElements()) && 2610 "Vector element count mismatch!"); 2611 if (OpOpcode == ISD::TRUNCATE) 2612 return getNode(ISD::TRUNCATE, DL, VT, Operand.getNode()->getOperand(0)); 2613 if (OpOpcode == ISD::ZERO_EXTEND || OpOpcode == ISD::SIGN_EXTEND || 2614 OpOpcode == ISD::ANY_EXTEND) { 2615 // If the source is smaller than the dest, we still need an extend. 2616 if (Operand.getNode()->getOperand(0).getValueType().getScalarType() 2617 .bitsLT(VT.getScalarType())) 2618 return getNode(OpOpcode, DL, VT, Operand.getNode()->getOperand(0)); 2619 if (Operand.getNode()->getOperand(0).getValueType().bitsGT(VT)) 2620 return getNode(ISD::TRUNCATE, DL, VT, Operand.getNode()->getOperand(0)); 2621 return Operand.getNode()->getOperand(0); 2622 } 2623 if (OpOpcode == ISD::UNDEF) 2624 return getUNDEF(VT); 2625 break; 2626 case ISD::BITCAST: 2627 // Basic sanity checking. 2628 assert(VT.getSizeInBits() == Operand.getValueType().getSizeInBits() 2629 && "Cannot BITCAST between types of different sizes!"); 2630 if (VT == Operand.getValueType()) return Operand; // noop conversion. 2631 if (OpOpcode == ISD::BITCAST) // bitconv(bitconv(x)) -> bitconv(x) 2632 return getNode(ISD::BITCAST, DL, VT, Operand.getOperand(0)); 2633 if (OpOpcode == ISD::UNDEF) 2634 return getUNDEF(VT); 2635 break; 2636 case ISD::SCALAR_TO_VECTOR: 2637 assert(VT.isVector() && !Operand.getValueType().isVector() && 2638 (VT.getVectorElementType() == Operand.getValueType() || 2639 (VT.getVectorElementType().isInteger() && 2640 Operand.getValueType().isInteger() && 2641 VT.getVectorElementType().bitsLE(Operand.getValueType()))) && 2642 "Illegal SCALAR_TO_VECTOR node!"); 2643 if (OpOpcode == ISD::UNDEF) 2644 return getUNDEF(VT); 2645 // scalar_to_vector(extract_vector_elt V, 0) -> V, top bits are undefined. 2646 if (OpOpcode == ISD::EXTRACT_VECTOR_ELT && 2647 isa<ConstantSDNode>(Operand.getOperand(1)) && 2648 Operand.getConstantOperandVal(1) == 0 && 2649 Operand.getOperand(0).getValueType() == VT) 2650 return Operand.getOperand(0); 2651 break; 2652 case ISD::FNEG: 2653 // -(X-Y) -> (Y-X) is unsafe because when X==Y, -0.0 != +0.0 2654 if (getTarget().Options.UnsafeFPMath && OpOpcode == ISD::FSUB) 2655 return getNode(ISD::FSUB, DL, VT, Operand.getNode()->getOperand(1), 2656 Operand.getNode()->getOperand(0)); 2657 if (OpOpcode == ISD::FNEG) // --X -> X 2658 return Operand.getNode()->getOperand(0); 2659 break; 2660 case ISD::FABS: 2661 if (OpOpcode == ISD::FNEG) // abs(-X) -> abs(X) 2662 return getNode(ISD::FABS, DL, VT, Operand.getNode()->getOperand(0)); 2663 break; 2664 } 2665 2666 SDNode *N; 2667 SDVTList VTs = getVTList(VT); 2668 if (VT != MVT::Glue) { // Don't CSE flag producing nodes 2669 FoldingSetNodeID ID; 2670 SDValue Ops[1] = { Operand }; 2671 AddNodeIDNode(ID, Opcode, VTs, Ops, 1); 2672 void *IP = 0; 2673 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 2674 return SDValue(E, 0); 2675 2676 N = new (NodeAllocator) UnarySDNode(Opcode, DL, VTs, Operand); 2677 CSEMap.InsertNode(N, IP); 2678 } else { 2679 N = new (NodeAllocator) UnarySDNode(Opcode, DL, VTs, Operand); 2680 } 2681 2682 AllNodes.push_back(N); 2683#ifndef NDEBUG 2684 VerifySDNode(N); 2685#endif 2686 return SDValue(N, 0); 2687} 2688 2689SDValue SelectionDAG::FoldConstantArithmetic(unsigned Opcode, 2690 EVT VT, 2691 ConstantSDNode *Cst1, 2692 ConstantSDNode *Cst2) { 2693 const APInt &C1 = Cst1->getAPIntValue(), &C2 = Cst2->getAPIntValue(); 2694 2695 switch (Opcode) { 2696 case ISD::ADD: return getConstant(C1 + C2, VT); 2697 case ISD::SUB: return getConstant(C1 - C2, VT); 2698 case ISD::MUL: return getConstant(C1 * C2, VT); 2699 case ISD::UDIV: 2700 if (C2.getBoolValue()) return getConstant(C1.udiv(C2), VT); 2701 break; 2702 case ISD::UREM: 2703 if (C2.getBoolValue()) return getConstant(C1.urem(C2), VT); 2704 break; 2705 case ISD::SDIV: 2706 if (C2.getBoolValue()) return getConstant(C1.sdiv(C2), VT); 2707 break; 2708 case ISD::SREM: 2709 if (C2.getBoolValue()) return getConstant(C1.srem(C2), VT); 2710 break; 2711 case ISD::AND: return getConstant(C1 & C2, VT); 2712 case ISD::OR: return getConstant(C1 | C2, VT); 2713 case ISD::XOR: return getConstant(C1 ^ C2, VT); 2714 case ISD::SHL: return getConstant(C1 << C2, VT); 2715 case ISD::SRL: return getConstant(C1.lshr(C2), VT); 2716 case ISD::SRA: return getConstant(C1.ashr(C2), VT); 2717 case ISD::ROTL: return getConstant(C1.rotl(C2), VT); 2718 case ISD::ROTR: return getConstant(C1.rotr(C2), VT); 2719 default: break; 2720 } 2721 2722 return SDValue(); 2723} 2724 2725SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, EVT VT, 2726 SDValue N1, SDValue N2) { 2727 ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.getNode()); 2728 ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.getNode()); 2729 switch (Opcode) { 2730 default: break; 2731 case ISD::TokenFactor: 2732 assert(VT == MVT::Other && N1.getValueType() == MVT::Other && 2733 N2.getValueType() == MVT::Other && "Invalid token factor!"); 2734 // Fold trivial token factors. 2735 if (N1.getOpcode() == ISD::EntryToken) return N2; 2736 if (N2.getOpcode() == ISD::EntryToken) return N1; 2737 if (N1 == N2) return N1; 2738 break; 2739 case ISD::CONCAT_VECTORS: 2740 // Concat of UNDEFs is UNDEF. 2741 if (N1.getOpcode() == ISD::UNDEF && 2742 N2.getOpcode() == ISD::UNDEF) 2743 return getUNDEF(VT); 2744 2745 // A CONCAT_VECTOR with all operands BUILD_VECTOR can be simplified to 2746 // one big BUILD_VECTOR. 2747 if (N1.getOpcode() == ISD::BUILD_VECTOR && 2748 N2.getOpcode() == ISD::BUILD_VECTOR) { 2749 SmallVector<SDValue, 16> Elts(N1.getNode()->op_begin(), 2750 N1.getNode()->op_end()); 2751 Elts.append(N2.getNode()->op_begin(), N2.getNode()->op_end()); 2752 return getNode(ISD::BUILD_VECTOR, DL, VT, &Elts[0], Elts.size()); 2753 } 2754 break; 2755 case ISD::AND: 2756 assert(VT.isInteger() && "This operator does not apply to FP types!"); 2757 assert(N1.getValueType() == N2.getValueType() && 2758 N1.getValueType() == VT && "Binary operator types must match!"); 2759 // (X & 0) -> 0. This commonly occurs when legalizing i64 values, so it's 2760 // worth handling here. 2761 if (N2C && N2C->isNullValue()) 2762 return N2; 2763 if (N2C && N2C->isAllOnesValue()) // X & -1 -> X 2764 return N1; 2765 break; 2766 case ISD::OR: 2767 case ISD::XOR: 2768 case ISD::ADD: 2769 case ISD::SUB: 2770 assert(VT.isInteger() && "This operator does not apply to FP types!"); 2771 assert(N1.getValueType() == N2.getValueType() && 2772 N1.getValueType() == VT && "Binary operator types must match!"); 2773 // (X ^|+- 0) -> X. This commonly occurs when legalizing i64 values, so 2774 // it's worth handling here. 2775 if (N2C && N2C->isNullValue()) 2776 return N1; 2777 break; 2778 case ISD::UDIV: 2779 case ISD::UREM: 2780 case ISD::MULHU: 2781 case ISD::MULHS: 2782 case ISD::MUL: 2783 case ISD::SDIV: 2784 case ISD::SREM: 2785 assert(VT.isInteger() && "This operator does not apply to FP types!"); 2786 assert(N1.getValueType() == N2.getValueType() && 2787 N1.getValueType() == VT && "Binary operator types must match!"); 2788 break; 2789 case ISD::FADD: 2790 case ISD::FSUB: 2791 case ISD::FMUL: 2792 case ISD::FDIV: 2793 case ISD::FREM: 2794 if (getTarget().Options.UnsafeFPMath) { 2795 if (Opcode == ISD::FADD) { 2796 // 0+x --> x 2797 if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(N1)) 2798 if (CFP->getValueAPF().isZero()) 2799 return N2; 2800 // x+0 --> x 2801 if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(N2)) 2802 if (CFP->getValueAPF().isZero()) 2803 return N1; 2804 } else if (Opcode == ISD::FSUB) { 2805 // x-0 --> x 2806 if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(N2)) 2807 if (CFP->getValueAPF().isZero()) 2808 return N1; 2809 } else if (Opcode == ISD::FMUL) { 2810 ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(N1); 2811 SDValue V = N2; 2812 2813 // If the first operand isn't the constant, try the second 2814 if (!CFP) { 2815 CFP = dyn_cast<ConstantFPSDNode>(N2); 2816 V = N1; 2817 } 2818 2819 if (CFP) { 2820 // 0*x --> 0 2821 if (CFP->isZero()) 2822 return SDValue(CFP,0); 2823 // 1*x --> x 2824 if (CFP->isExactlyValue(1.0)) 2825 return V; 2826 } 2827 } 2828 } 2829 assert(VT.isFloatingPoint() && "This operator only applies to FP types!"); 2830 assert(N1.getValueType() == N2.getValueType() && 2831 N1.getValueType() == VT && "Binary operator types must match!"); 2832 break; 2833 case ISD::FCOPYSIGN: // N1 and result must match. N1/N2 need not match. 2834 assert(N1.getValueType() == VT && 2835 N1.getValueType().isFloatingPoint() && 2836 N2.getValueType().isFloatingPoint() && 2837 "Invalid FCOPYSIGN!"); 2838 break; 2839 case ISD::SHL: 2840 case ISD::SRA: 2841 case ISD::SRL: 2842 case ISD::ROTL: 2843 case ISD::ROTR: 2844 assert(VT == N1.getValueType() && 2845 "Shift operators return type must be the same as their first arg"); 2846 assert(VT.isInteger() && N2.getValueType().isInteger() && 2847 "Shifts only work on integers"); 2848 // Verify that the shift amount VT is bit enough to hold valid shift 2849 // amounts. This catches things like trying to shift an i1024 value by an 2850 // i8, which is easy to fall into in generic code that uses 2851 // TLI.getShiftAmount(). 2852 assert(N2.getValueType().getSizeInBits() >= 2853 Log2_32_Ceil(N1.getValueType().getSizeInBits()) && 2854 "Invalid use of small shift amount with oversized value!"); 2855 2856 // Always fold shifts of i1 values so the code generator doesn't need to 2857 // handle them. Since we know the size of the shift has to be less than the 2858 // size of the value, the shift/rotate count is guaranteed to be zero. 2859 if (VT == MVT::i1) 2860 return N1; 2861 if (N2C && N2C->isNullValue()) 2862 return N1; 2863 break; 2864 case ISD::FP_ROUND_INREG: { 2865 EVT EVT = cast<VTSDNode>(N2)->getVT(); 2866 assert(VT == N1.getValueType() && "Not an inreg round!"); 2867 assert(VT.isFloatingPoint() && EVT.isFloatingPoint() && 2868 "Cannot FP_ROUND_INREG integer types"); 2869 assert(EVT.isVector() == VT.isVector() && 2870 "FP_ROUND_INREG type should be vector iff the operand " 2871 "type is vector!"); 2872 assert((!EVT.isVector() || 2873 EVT.getVectorNumElements() == VT.getVectorNumElements()) && 2874 "Vector element counts must match in FP_ROUND_INREG"); 2875 assert(EVT.bitsLE(VT) && "Not rounding down!"); 2876 (void)EVT; 2877 if (cast<VTSDNode>(N2)->getVT() == VT) return N1; // Not actually rounding. 2878 break; 2879 } 2880 case ISD::FP_ROUND: 2881 assert(VT.isFloatingPoint() && 2882 N1.getValueType().isFloatingPoint() && 2883 VT.bitsLE(N1.getValueType()) && 2884 isa<ConstantSDNode>(N2) && "Invalid FP_ROUND!"); 2885 if (N1.getValueType() == VT) return N1; // noop conversion. 2886 break; 2887 case ISD::AssertSext: 2888 case ISD::AssertZext: { 2889 EVT EVT = cast<VTSDNode>(N2)->getVT(); 2890 assert(VT == N1.getValueType() && "Not an inreg extend!"); 2891 assert(VT.isInteger() && EVT.isInteger() && 2892 "Cannot *_EXTEND_INREG FP types"); 2893 assert(!EVT.isVector() && 2894 "AssertSExt/AssertZExt type should be the vector element type " 2895 "rather than the vector type!"); 2896 assert(EVT.bitsLE(VT) && "Not extending!"); 2897 if (VT == EVT) return N1; // noop assertion. 2898 break; 2899 } 2900 case ISD::SIGN_EXTEND_INREG: { 2901 EVT EVT = cast<VTSDNode>(N2)->getVT(); 2902 assert(VT == N1.getValueType() && "Not an inreg extend!"); 2903 assert(VT.isInteger() && EVT.isInteger() && 2904 "Cannot *_EXTEND_INREG FP types"); 2905 assert(EVT.isVector() == VT.isVector() && 2906 "SIGN_EXTEND_INREG type should be vector iff the operand " 2907 "type is vector!"); 2908 assert((!EVT.isVector() || 2909 EVT.getVectorNumElements() == VT.getVectorNumElements()) && 2910 "Vector element counts must match in SIGN_EXTEND_INREG"); 2911 assert(EVT.bitsLE(VT) && "Not extending!"); 2912 if (EVT == VT) return N1; // Not actually extending 2913 2914 if (N1C) { 2915 APInt Val = N1C->getAPIntValue(); 2916 unsigned FromBits = EVT.getScalarType().getSizeInBits(); 2917 Val <<= Val.getBitWidth()-FromBits; 2918 Val = Val.ashr(Val.getBitWidth()-FromBits); 2919 return getConstant(Val, VT); 2920 } 2921 break; 2922 } 2923 case ISD::EXTRACT_VECTOR_ELT: 2924 // EXTRACT_VECTOR_ELT of an UNDEF is an UNDEF. 2925 if (N1.getOpcode() == ISD::UNDEF) 2926 return getUNDEF(VT); 2927 2928 // EXTRACT_VECTOR_ELT of CONCAT_VECTORS is often formed while lowering is 2929 // expanding copies of large vectors from registers. 2930 if (N2C && 2931 N1.getOpcode() == ISD::CONCAT_VECTORS && 2932 N1.getNumOperands() > 0) { 2933 unsigned Factor = 2934 N1.getOperand(0).getValueType().getVectorNumElements(); 2935 return getNode(ISD::EXTRACT_VECTOR_ELT, DL, VT, 2936 N1.getOperand(N2C->getZExtValue() / Factor), 2937 getConstant(N2C->getZExtValue() % Factor, 2938 N2.getValueType())); 2939 } 2940 2941 // EXTRACT_VECTOR_ELT of BUILD_VECTOR is often formed while lowering is 2942 // expanding large vector constants. 2943 if (N2C && N1.getOpcode() == ISD::BUILD_VECTOR) { 2944 SDValue Elt = N1.getOperand(N2C->getZExtValue()); 2945 2946 if (VT != Elt.getValueType()) 2947 // If the vector element type is not legal, the BUILD_VECTOR operands 2948 // are promoted and implicitly truncated, and the result implicitly 2949 // extended. Make that explicit here. 2950 Elt = getAnyExtOrTrunc(Elt, DL, VT); 2951 2952 return Elt; 2953 } 2954 2955 // EXTRACT_VECTOR_ELT of INSERT_VECTOR_ELT is often formed when vector 2956 // operations are lowered to scalars. 2957 if (N1.getOpcode() == ISD::INSERT_VECTOR_ELT) { 2958 // If the indices are the same, return the inserted element else 2959 // if the indices are known different, extract the element from 2960 // the original vector. 2961 SDValue N1Op2 = N1.getOperand(2); 2962 ConstantSDNode *N1Op2C = dyn_cast<ConstantSDNode>(N1Op2.getNode()); 2963 2964 if (N1Op2C && N2C) { 2965 if (N1Op2C->getZExtValue() == N2C->getZExtValue()) { 2966 if (VT == N1.getOperand(1).getValueType()) 2967 return N1.getOperand(1); 2968 else 2969 return getSExtOrTrunc(N1.getOperand(1), DL, VT); 2970 } 2971 2972 return getNode(ISD::EXTRACT_VECTOR_ELT, DL, VT, N1.getOperand(0), N2); 2973 } 2974 } 2975 break; 2976 case ISD::EXTRACT_ELEMENT: 2977 assert(N2C && (unsigned)N2C->getZExtValue() < 2 && "Bad EXTRACT_ELEMENT!"); 2978 assert(!N1.getValueType().isVector() && !VT.isVector() && 2979 (N1.getValueType().isInteger() == VT.isInteger()) && 2980 N1.getValueType() != VT && 2981 "Wrong types for EXTRACT_ELEMENT!"); 2982 2983 // EXTRACT_ELEMENT of BUILD_PAIR is often formed while legalize is expanding 2984 // 64-bit integers into 32-bit parts. Instead of building the extract of 2985 // the BUILD_PAIR, only to have legalize rip it apart, just do it now. 2986 if (N1.getOpcode() == ISD::BUILD_PAIR) 2987 return N1.getOperand(N2C->getZExtValue()); 2988 2989 // EXTRACT_ELEMENT of a constant int is also very common. 2990 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(N1)) { 2991 unsigned ElementSize = VT.getSizeInBits(); 2992 unsigned Shift = ElementSize * N2C->getZExtValue(); 2993 APInt ShiftedVal = C->getAPIntValue().lshr(Shift); 2994 return getConstant(ShiftedVal.trunc(ElementSize), VT); 2995 } 2996 break; 2997 case ISD::EXTRACT_SUBVECTOR: { 2998 SDValue Index = N2; 2999 if (VT.isSimple() && N1.getValueType().isSimple()) { 3000 assert(VT.isVector() && N1.getValueType().isVector() && 3001 "Extract subvector VTs must be a vectors!"); 3002 assert(VT.getVectorElementType() == N1.getValueType().getVectorElementType() && 3003 "Extract subvector VTs must have the same element type!"); 3004 assert(VT.getSimpleVT() <= N1.getValueType().getSimpleVT() && 3005 "Extract subvector must be from larger vector to smaller vector!"); 3006 3007 if (isa<ConstantSDNode>(Index.getNode())) { 3008 assert((VT.getVectorNumElements() + 3009 cast<ConstantSDNode>(Index.getNode())->getZExtValue() 3010 <= N1.getValueType().getVectorNumElements()) 3011 && "Extract subvector overflow!"); 3012 } 3013 3014 // Trivial extraction. 3015 if (VT.getSimpleVT() == N1.getValueType().getSimpleVT()) 3016 return N1; 3017 } 3018 break; 3019 } 3020 } 3021 3022 if (N1C) { 3023 if (N2C) { 3024 SDValue SV = FoldConstantArithmetic(Opcode, VT, N1C, N2C); 3025 if (SV.getNode()) return SV; 3026 } else { // Cannonicalize constant to RHS if commutative 3027 if (isCommutativeBinOp(Opcode)) { 3028 std::swap(N1C, N2C); 3029 std::swap(N1, N2); 3030 } 3031 } 3032 } 3033 3034 // Constant fold FP operations. 3035 ConstantFPSDNode *N1CFP = dyn_cast<ConstantFPSDNode>(N1.getNode()); 3036 ConstantFPSDNode *N2CFP = dyn_cast<ConstantFPSDNode>(N2.getNode()); 3037 if (N1CFP) { 3038 if (!N2CFP && isCommutativeBinOp(Opcode)) { 3039 // Cannonicalize constant to RHS if commutative 3040 std::swap(N1CFP, N2CFP); 3041 std::swap(N1, N2); 3042 } else if (N2CFP) { 3043 APFloat V1 = N1CFP->getValueAPF(), V2 = N2CFP->getValueAPF(); 3044 APFloat::opStatus s; 3045 switch (Opcode) { 3046 case ISD::FADD: 3047 s = V1.add(V2, APFloat::rmNearestTiesToEven); 3048 if (s != APFloat::opInvalidOp) 3049 return getConstantFP(V1, VT); 3050 break; 3051 case ISD::FSUB: 3052 s = V1.subtract(V2, APFloat::rmNearestTiesToEven); 3053 if (s!=APFloat::opInvalidOp) 3054 return getConstantFP(V1, VT); 3055 break; 3056 case ISD::FMUL: 3057 s = V1.multiply(V2, APFloat::rmNearestTiesToEven); 3058 if (s!=APFloat::opInvalidOp) 3059 return getConstantFP(V1, VT); 3060 break; 3061 case ISD::FDIV: 3062 s = V1.divide(V2, APFloat::rmNearestTiesToEven); 3063 if (s!=APFloat::opInvalidOp && s!=APFloat::opDivByZero) 3064 return getConstantFP(V1, VT); 3065 break; 3066 case ISD::FREM : 3067 s = V1.mod(V2, APFloat::rmNearestTiesToEven); 3068 if (s!=APFloat::opInvalidOp && s!=APFloat::opDivByZero) 3069 return getConstantFP(V1, VT); 3070 break; 3071 case ISD::FCOPYSIGN: 3072 V1.copySign(V2); 3073 return getConstantFP(V1, VT); 3074 default: break; 3075 } 3076 } 3077 3078 if (Opcode == ISD::FP_ROUND) { 3079 APFloat V = N1CFP->getValueAPF(); // make copy 3080 bool ignored; 3081 // This can return overflow, underflow, or inexact; we don't care. 3082 // FIXME need to be more flexible about rounding mode. 3083 (void)V.convert(*EVTToAPFloatSemantics(VT), 3084 APFloat::rmNearestTiesToEven, &ignored); 3085 return getConstantFP(V, VT); 3086 } 3087 } 3088 3089 // Canonicalize an UNDEF to the RHS, even over a constant. 3090 if (N1.getOpcode() == ISD::UNDEF) { 3091 if (isCommutativeBinOp(Opcode)) { 3092 std::swap(N1, N2); 3093 } else { 3094 switch (Opcode) { 3095 case ISD::FP_ROUND_INREG: 3096 case ISD::SIGN_EXTEND_INREG: 3097 case ISD::SUB: 3098 case ISD::FSUB: 3099 case ISD::FDIV: 3100 case ISD::FREM: 3101 case ISD::SRA: 3102 return N1; // fold op(undef, arg2) -> undef 3103 case ISD::UDIV: 3104 case ISD::SDIV: 3105 case ISD::UREM: 3106 case ISD::SREM: 3107 case ISD::SRL: 3108 case ISD::SHL: 3109 if (!VT.isVector()) 3110 return getConstant(0, VT); // fold op(undef, arg2) -> 0 3111 // For vectors, we can't easily build an all zero vector, just return 3112 // the LHS. 3113 return N2; 3114 } 3115 } 3116 } 3117 3118 // Fold a bunch of operators when the RHS is undef. 3119 if (N2.getOpcode() == ISD::UNDEF) { 3120 switch (Opcode) { 3121 case ISD::XOR: 3122 if (N1.getOpcode() == ISD::UNDEF) 3123 // Handle undef ^ undef -> 0 special case. This is a common 3124 // idiom (misuse). 3125 return getConstant(0, VT); 3126 // fallthrough 3127 case ISD::ADD: 3128 case ISD::ADDC: 3129 case ISD::ADDE: 3130 case ISD::SUB: 3131 case ISD::UDIV: 3132 case ISD::SDIV: 3133 case ISD::UREM: 3134 case ISD::SREM: 3135 return N2; // fold op(arg1, undef) -> undef 3136 case ISD::FADD: 3137 case ISD::FSUB: 3138 case ISD::FMUL: 3139 case ISD::FDIV: 3140 case ISD::FREM: 3141 if (getTarget().Options.UnsafeFPMath) 3142 return N2; 3143 break; 3144 case ISD::MUL: 3145 case ISD::AND: 3146 case ISD::SRL: 3147 case ISD::SHL: 3148 if (!VT.isVector()) 3149 return getConstant(0, VT); // fold op(arg1, undef) -> 0 3150 // For vectors, we can't easily build an all zero vector, just return 3151 // the LHS. 3152 return N1; 3153 case ISD::OR: 3154 if (!VT.isVector()) 3155 return getConstant(APInt::getAllOnesValue(VT.getSizeInBits()), VT); 3156 // For vectors, we can't easily build an all one vector, just return 3157 // the LHS. 3158 return N1; 3159 case ISD::SRA: 3160 return N1; 3161 } 3162 } 3163 3164 // Memoize this node if possible. 3165 SDNode *N; 3166 SDVTList VTs = getVTList(VT); 3167 if (VT != MVT::Glue) { 3168 SDValue Ops[] = { N1, N2 }; 3169 FoldingSetNodeID ID; 3170 AddNodeIDNode(ID, Opcode, VTs, Ops, 2); 3171 void *IP = 0; 3172 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 3173 return SDValue(E, 0); 3174 3175 N = new (NodeAllocator) BinarySDNode(Opcode, DL, VTs, N1, N2); 3176 CSEMap.InsertNode(N, IP); 3177 } else { 3178 N = new (NodeAllocator) BinarySDNode(Opcode, DL, VTs, N1, N2); 3179 } 3180 3181 AllNodes.push_back(N); 3182#ifndef NDEBUG 3183 VerifySDNode(N); 3184#endif 3185 return SDValue(N, 0); 3186} 3187 3188SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, EVT VT, 3189 SDValue N1, SDValue N2, SDValue N3) { 3190 // Perform various simplifications. 3191 ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.getNode()); 3192 switch (Opcode) { 3193 case ISD::CONCAT_VECTORS: 3194 // A CONCAT_VECTOR with all operands BUILD_VECTOR can be simplified to 3195 // one big BUILD_VECTOR. 3196 if (N1.getOpcode() == ISD::BUILD_VECTOR && 3197 N2.getOpcode() == ISD::BUILD_VECTOR && 3198 N3.getOpcode() == ISD::BUILD_VECTOR) { 3199 SmallVector<SDValue, 16> Elts(N1.getNode()->op_begin(), 3200 N1.getNode()->op_end()); 3201 Elts.append(N2.getNode()->op_begin(), N2.getNode()->op_end()); 3202 Elts.append(N3.getNode()->op_begin(), N3.getNode()->op_end()); 3203 return getNode(ISD::BUILD_VECTOR, DL, VT, &Elts[0], Elts.size()); 3204 } 3205 break; 3206 case ISD::SETCC: { 3207 // Use FoldSetCC to simplify SETCC's. 3208 SDValue Simp = FoldSetCC(VT, N1, N2, cast<CondCodeSDNode>(N3)->get(), DL); 3209 if (Simp.getNode()) return Simp; 3210 break; 3211 } 3212 case ISD::SELECT: 3213 if (N1C) { 3214 if (N1C->getZExtValue()) 3215 return N2; // select true, X, Y -> X 3216 return N3; // select false, X, Y -> Y 3217 } 3218 3219 if (N2 == N3) return N2; // select C, X, X -> X 3220 break; 3221 case ISD::VECTOR_SHUFFLE: 3222 llvm_unreachable("should use getVectorShuffle constructor!"); 3223 case ISD::INSERT_SUBVECTOR: { 3224 SDValue Index = N3; 3225 if (VT.isSimple() && N1.getValueType().isSimple() 3226 && N2.getValueType().isSimple()) { 3227 assert(VT.isVector() && N1.getValueType().isVector() && 3228 N2.getValueType().isVector() && 3229 "Insert subvector VTs must be a vectors"); 3230 assert(VT == N1.getValueType() && 3231 "Dest and insert subvector source types must match!"); 3232 assert(N2.getValueType().getSimpleVT() <= N1.getValueType().getSimpleVT() && 3233 "Insert subvector must be from smaller vector to larger vector!"); 3234 if (isa<ConstantSDNode>(Index.getNode())) { 3235 assert((N2.getValueType().getVectorNumElements() + 3236 cast<ConstantSDNode>(Index.getNode())->getZExtValue() 3237 <= VT.getVectorNumElements()) 3238 && "Insert subvector overflow!"); 3239 } 3240 3241 // Trivial insertion. 3242 if (VT.getSimpleVT() == N2.getValueType().getSimpleVT()) 3243 return N2; 3244 } 3245 break; 3246 } 3247 case ISD::BITCAST: 3248 // Fold bit_convert nodes from a type to themselves. 3249 if (N1.getValueType() == VT) 3250 return N1; 3251 break; 3252 } 3253 3254 // Memoize node if it doesn't produce a flag. 3255 SDNode *N; 3256 SDVTList VTs = getVTList(VT); 3257 if (VT != MVT::Glue) { 3258 SDValue Ops[] = { N1, N2, N3 }; 3259 FoldingSetNodeID ID; 3260 AddNodeIDNode(ID, Opcode, VTs, Ops, 3); 3261 void *IP = 0; 3262 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 3263 return SDValue(E, 0); 3264 3265 N = new (NodeAllocator) TernarySDNode(Opcode, DL, VTs, N1, N2, N3); 3266 CSEMap.InsertNode(N, IP); 3267 } else { 3268 N = new (NodeAllocator) TernarySDNode(Opcode, DL, VTs, N1, N2, N3); 3269 } 3270 3271 AllNodes.push_back(N); 3272#ifndef NDEBUG 3273 VerifySDNode(N); 3274#endif 3275 return SDValue(N, 0); 3276} 3277 3278SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, EVT VT, 3279 SDValue N1, SDValue N2, SDValue N3, 3280 SDValue N4) { 3281 SDValue Ops[] = { N1, N2, N3, N4 }; 3282 return getNode(Opcode, DL, VT, Ops, 4); 3283} 3284 3285SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, EVT VT, 3286 SDValue N1, SDValue N2, SDValue N3, 3287 SDValue N4, SDValue N5) { 3288 SDValue Ops[] = { N1, N2, N3, N4, N5 }; 3289 return getNode(Opcode, DL, VT, Ops, 5); 3290} 3291 3292/// getStackArgumentTokenFactor - Compute a TokenFactor to force all 3293/// the incoming stack arguments to be loaded from the stack. 3294SDValue SelectionDAG::getStackArgumentTokenFactor(SDValue Chain) { 3295 SmallVector<SDValue, 8> ArgChains; 3296 3297 // Include the original chain at the beginning of the list. When this is 3298 // used by target LowerCall hooks, this helps legalize find the 3299 // CALLSEQ_BEGIN node. 3300 ArgChains.push_back(Chain); 3301 3302 // Add a chain value for each stack argument. 3303 for (SDNode::use_iterator U = getEntryNode().getNode()->use_begin(), 3304 UE = getEntryNode().getNode()->use_end(); U != UE; ++U) 3305 if (LoadSDNode *L = dyn_cast<LoadSDNode>(*U)) 3306 if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(L->getBasePtr())) 3307 if (FI->getIndex() < 0) 3308 ArgChains.push_back(SDValue(L, 1)); 3309 3310 // Build a tokenfactor for all the chains. 3311 return getNode(ISD::TokenFactor, Chain.getDebugLoc(), MVT::Other, 3312 &ArgChains[0], ArgChains.size()); 3313} 3314 3315/// SplatByte - Distribute ByteVal over NumBits bits. 3316static APInt SplatByte(unsigned NumBits, uint8_t ByteVal) { 3317 APInt Val = APInt(NumBits, ByteVal); 3318 unsigned Shift = 8; 3319 for (unsigned i = NumBits; i > 8; i >>= 1) { 3320 Val = (Val << Shift) | Val; 3321 Shift <<= 1; 3322 } 3323 return Val; 3324} 3325 3326/// getMemsetValue - Vectorized representation of the memset value 3327/// operand. 3328static SDValue getMemsetValue(SDValue Value, EVT VT, SelectionDAG &DAG, 3329 DebugLoc dl) { 3330 assert(Value.getOpcode() != ISD::UNDEF); 3331 3332 unsigned NumBits = VT.getScalarType().getSizeInBits(); 3333 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Value)) { 3334 APInt Val = SplatByte(NumBits, C->getZExtValue() & 255); 3335 if (VT.isInteger()) 3336 return DAG.getConstant(Val, VT); 3337 return DAG.getConstantFP(APFloat(Val), VT); 3338 } 3339 3340 Value = DAG.getNode(ISD::ZERO_EXTEND, dl, VT, Value); 3341 if (NumBits > 8) { 3342 // Use a multiplication with 0x010101... to extend the input to the 3343 // required length. 3344 APInt Magic = SplatByte(NumBits, 0x01); 3345 Value = DAG.getNode(ISD::MUL, dl, VT, Value, DAG.getConstant(Magic, VT)); 3346 } 3347 3348 return Value; 3349} 3350 3351/// getMemsetStringVal - Similar to getMemsetValue. Except this is only 3352/// used when a memcpy is turned into a memset when the source is a constant 3353/// string ptr. 3354static SDValue getMemsetStringVal(EVT VT, DebugLoc dl, SelectionDAG &DAG, 3355 const TargetLowering &TLI, StringRef Str) { 3356 // Handle vector with all elements zero. 3357 if (Str.empty()) { 3358 if (VT.isInteger()) 3359 return DAG.getConstant(0, VT); 3360 else if (VT == MVT::f32 || VT == MVT::f64) 3361 return DAG.getConstantFP(0.0, VT); 3362 else if (VT.isVector()) { 3363 unsigned NumElts = VT.getVectorNumElements(); 3364 MVT EltVT = (VT.getVectorElementType() == MVT::f32) ? MVT::i32 : MVT::i64; 3365 return DAG.getNode(ISD::BITCAST, dl, VT, 3366 DAG.getConstant(0, EVT::getVectorVT(*DAG.getContext(), 3367 EltVT, NumElts))); 3368 } else 3369 llvm_unreachable("Expected type!"); 3370 } 3371 3372 assert(!VT.isVector() && "Can't handle vector type here!"); 3373 unsigned NumVTBytes = VT.getSizeInBits() / 8; 3374 unsigned NumBytes = std::min(NumVTBytes, unsigned(Str.size())); 3375 3376 uint64_t Val = 0; 3377 if (TLI.isLittleEndian()) { 3378 for (unsigned i = 0; i != NumBytes; ++i) 3379 Val |= (uint64_t)(unsigned char)Str[i] << i*8; 3380 } else { 3381 for (unsigned i = 0; i != NumBytes; ++i) 3382 Val |= (uint64_t)(unsigned char)Str[i] << (NumVTBytes-i-1)*8; 3383 } 3384 3385 return DAG.getConstant(Val, VT); 3386} 3387 3388/// getMemBasePlusOffset - Returns base and offset node for the 3389/// 3390static SDValue getMemBasePlusOffset(SDValue Base, unsigned Offset, 3391 SelectionDAG &DAG) { 3392 EVT VT = Base.getValueType(); 3393 return DAG.getNode(ISD::ADD, Base.getDebugLoc(), 3394 VT, Base, DAG.getConstant(Offset, VT)); 3395} 3396 3397/// isMemSrcFromString - Returns true if memcpy source is a string constant. 3398/// 3399static bool isMemSrcFromString(SDValue Src, StringRef &Str) { 3400 unsigned SrcDelta = 0; 3401 GlobalAddressSDNode *G = NULL; 3402 if (Src.getOpcode() == ISD::GlobalAddress) 3403 G = cast<GlobalAddressSDNode>(Src); 3404 else if (Src.getOpcode() == ISD::ADD && 3405 Src.getOperand(0).getOpcode() == ISD::GlobalAddress && 3406 Src.getOperand(1).getOpcode() == ISD::Constant) { 3407 G = cast<GlobalAddressSDNode>(Src.getOperand(0)); 3408 SrcDelta = cast<ConstantSDNode>(Src.getOperand(1))->getZExtValue(); 3409 } 3410 if (!G) 3411 return false; 3412 3413 return getConstantStringInfo(G->getGlobal(), Str, SrcDelta, false); 3414} 3415 3416/// FindOptimalMemOpLowering - Determines the optimial series memory ops 3417/// to replace the memset / memcpy. Return true if the number of memory ops 3418/// is below the threshold. It returns the types of the sequence of 3419/// memory ops to perform memset / memcpy by reference. 3420static bool FindOptimalMemOpLowering(std::vector<EVT> &MemOps, 3421 unsigned Limit, uint64_t Size, 3422 unsigned DstAlign, unsigned SrcAlign, 3423 bool IsZeroVal, 3424 bool MemcpyStrSrc, 3425 SelectionDAG &DAG, 3426 const TargetLowering &TLI) { 3427 assert((SrcAlign == 0 || SrcAlign >= DstAlign) && 3428 "Expecting memcpy / memset source to meet alignment requirement!"); 3429 // If 'SrcAlign' is zero, that means the memory operation does not need to 3430 // load the value, i.e. memset or memcpy from constant string. Otherwise, 3431 // it's the inferred alignment of the source. 'DstAlign', on the other hand, 3432 // is the specified alignment of the memory operation. If it is zero, that 3433 // means it's possible to change the alignment of the destination. 3434 // 'MemcpyStrSrc' indicates whether the memcpy source is constant so it does 3435 // not need to be loaded. 3436 EVT VT = TLI.getOptimalMemOpType(Size, DstAlign, SrcAlign, 3437 IsZeroVal, MemcpyStrSrc, 3438 DAG.getMachineFunction()); 3439 Type *vtType = VT.isExtended() ? VT.getTypeForEVT(*DAG.getContext()) : NULL; 3440 unsigned AS = (vtType && vtType->isPointerTy()) ? 3441 cast<PointerType>(vtType)->getAddressSpace() : 0; 3442 3443 if (VT == MVT::Other) { 3444 if (DstAlign >= TLI.getDataLayout()->getPointerPrefAlignment(AS) || 3445 TLI.allowsUnalignedMemoryAccesses(VT)) { 3446 VT = TLI.getPointerTy(); 3447 } else { 3448 switch (DstAlign & 7) { 3449 case 0: VT = MVT::i64; break; 3450 case 4: VT = MVT::i32; break; 3451 case 2: VT = MVT::i16; break; 3452 default: VT = MVT::i8; break; 3453 } 3454 } 3455 3456 MVT LVT = MVT::i64; 3457 while (!TLI.isTypeLegal(LVT)) 3458 LVT = (MVT::SimpleValueType)(LVT.SimpleTy - 1); 3459 assert(LVT.isInteger()); 3460 3461 if (VT.bitsGT(LVT)) 3462 VT = LVT; 3463 } 3464 3465 unsigned NumMemOps = 0; 3466 while (Size != 0) { 3467 unsigned VTSize = VT.getSizeInBits() / 8; 3468 while (VTSize > Size) { 3469 // For now, only use non-vector load / store's for the left-over pieces. 3470 if (VT.isVector() || VT.isFloatingPoint()) { 3471 VT = MVT::i64; 3472 while (!TLI.isTypeLegal(VT)) 3473 VT = (MVT::SimpleValueType)(VT.getSimpleVT().SimpleTy - 1); 3474 VTSize = VT.getSizeInBits() / 8; 3475 } else { 3476 // This can result in a type that is not legal on the target, e.g. 3477 // 1 or 2 bytes on PPC. 3478 VT = (MVT::SimpleValueType)(VT.getSimpleVT().SimpleTy - 1); 3479 VTSize >>= 1; 3480 } 3481 } 3482 3483 if (++NumMemOps > Limit) 3484 return false; 3485 MemOps.push_back(VT); 3486 Size -= VTSize; 3487 } 3488 3489 return true; 3490} 3491 3492static SDValue getMemcpyLoadsAndStores(SelectionDAG &DAG, DebugLoc dl, 3493 SDValue Chain, SDValue Dst, 3494 SDValue Src, uint64_t Size, 3495 unsigned Align, bool isVol, 3496 bool AlwaysInline, 3497 MachinePointerInfo DstPtrInfo, 3498 MachinePointerInfo SrcPtrInfo) { 3499 // Turn a memcpy of undef to nop. 3500 if (Src.getOpcode() == ISD::UNDEF) 3501 return Chain; 3502 3503 // Expand memcpy to a series of load and store ops if the size operand falls 3504 // below a certain threshold. 3505 // TODO: In the AlwaysInline case, if the size is big then generate a loop 3506 // rather than maybe a humongous number of loads and stores. 3507 const TargetLowering &TLI = DAG.getTargetLoweringInfo(); 3508 std::vector<EVT> MemOps; 3509 bool DstAlignCanChange = false; 3510 MachineFunction &MF = DAG.getMachineFunction(); 3511 MachineFrameInfo *MFI = MF.getFrameInfo(); 3512 bool OptSize = 3513 MF.getFunction()->getFnAttributes(). 3514 hasAttribute(Attributes::OptimizeForSize); 3515 FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(Dst); 3516 if (FI && !MFI->isFixedObjectIndex(FI->getIndex())) 3517 DstAlignCanChange = true; 3518 unsigned SrcAlign = DAG.InferPtrAlignment(Src); 3519 if (Align > SrcAlign) 3520 SrcAlign = Align; 3521 StringRef Str; 3522 bool CopyFromStr = isMemSrcFromString(Src, Str); 3523 bool isZeroStr = CopyFromStr && Str.empty(); 3524 unsigned Limit = AlwaysInline ? ~0U : TLI.getMaxStoresPerMemcpy(OptSize); 3525 3526 if (!FindOptimalMemOpLowering(MemOps, Limit, Size, 3527 (DstAlignCanChange ? 0 : Align), 3528 (isZeroStr ? 0 : SrcAlign), 3529 true, CopyFromStr, DAG, TLI)) 3530 return SDValue(); 3531 3532 if (DstAlignCanChange) { 3533 Type *Ty = MemOps[0].getTypeForEVT(*DAG.getContext()); 3534 unsigned NewAlign = (unsigned) TLI.getDataLayout()->getABITypeAlignment(Ty); 3535 if (NewAlign > Align) { 3536 // Give the stack frame object a larger alignment if needed. 3537 if (MFI->getObjectAlignment(FI->getIndex()) < NewAlign) 3538 MFI->setObjectAlignment(FI->getIndex(), NewAlign); 3539 Align = NewAlign; 3540 } 3541 } 3542 3543 SmallVector<SDValue, 8> OutChains; 3544 unsigned NumMemOps = MemOps.size(); 3545 uint64_t SrcOff = 0, DstOff = 0; 3546 for (unsigned i = 0; i != NumMemOps; ++i) { 3547 EVT VT = MemOps[i]; 3548 unsigned VTSize = VT.getSizeInBits() / 8; 3549 SDValue Value, Store; 3550 3551 if (CopyFromStr && 3552 (isZeroStr || (VT.isInteger() && !VT.isVector()))) { 3553 // It's unlikely a store of a vector immediate can be done in a single 3554 // instruction. It would require a load from a constantpool first. 3555 // We only handle zero vectors here. 3556 // FIXME: Handle other cases where store of vector immediate is done in 3557 // a single instruction. 3558 Value = getMemsetStringVal(VT, dl, DAG, TLI, Str.substr(SrcOff)); 3559 Store = DAG.getStore(Chain, dl, Value, 3560 getMemBasePlusOffset(Dst, DstOff, DAG), 3561 DstPtrInfo.getWithOffset(DstOff), isVol, 3562 false, Align); 3563 } else { 3564 // The type might not be legal for the target. This should only happen 3565 // if the type is smaller than a legal type, as on PPC, so the right 3566 // thing to do is generate a LoadExt/StoreTrunc pair. These simplify 3567 // to Load/Store if NVT==VT. 3568 // FIXME does the case above also need this? 3569 EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), VT); 3570 assert(NVT.bitsGE(VT)); 3571 Value = DAG.getExtLoad(ISD::EXTLOAD, dl, NVT, Chain, 3572 getMemBasePlusOffset(Src, SrcOff, DAG), 3573 SrcPtrInfo.getWithOffset(SrcOff), VT, isVol, false, 3574 MinAlign(SrcAlign, SrcOff)); 3575 Store = DAG.getTruncStore(Chain, dl, Value, 3576 getMemBasePlusOffset(Dst, DstOff, DAG), 3577 DstPtrInfo.getWithOffset(DstOff), VT, isVol, 3578 false, Align); 3579 } 3580 OutChains.push_back(Store); 3581 SrcOff += VTSize; 3582 DstOff += VTSize; 3583 } 3584 3585 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, 3586 &OutChains[0], OutChains.size()); 3587} 3588 3589static SDValue getMemmoveLoadsAndStores(SelectionDAG &DAG, DebugLoc dl, 3590 SDValue Chain, SDValue Dst, 3591 SDValue Src, uint64_t Size, 3592 unsigned Align, bool isVol, 3593 bool AlwaysInline, 3594 MachinePointerInfo DstPtrInfo, 3595 MachinePointerInfo SrcPtrInfo) { 3596 // Turn a memmove of undef to nop. 3597 if (Src.getOpcode() == ISD::UNDEF) 3598 return Chain; 3599 3600 // Expand memmove to a series of load and store ops if the size operand falls 3601 // below a certain threshold. 3602 const TargetLowering &TLI = DAG.getTargetLoweringInfo(); 3603 std::vector<EVT> MemOps; 3604 bool DstAlignCanChange = false; 3605 MachineFunction &MF = DAG.getMachineFunction(); 3606 MachineFrameInfo *MFI = MF.getFrameInfo(); 3607 bool OptSize = MF.getFunction()->getFnAttributes(). 3608 hasAttribute(Attributes::OptimizeForSize); 3609 FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(Dst); 3610 if (FI && !MFI->isFixedObjectIndex(FI->getIndex())) 3611 DstAlignCanChange = true; 3612 unsigned SrcAlign = DAG.InferPtrAlignment(Src); 3613 if (Align > SrcAlign) 3614 SrcAlign = Align; 3615 unsigned Limit = AlwaysInline ? ~0U : TLI.getMaxStoresPerMemmove(OptSize); 3616 3617 if (!FindOptimalMemOpLowering(MemOps, Limit, Size, 3618 (DstAlignCanChange ? 0 : Align), 3619 SrcAlign, true, false, DAG, TLI)) 3620 return SDValue(); 3621 3622 if (DstAlignCanChange) { 3623 Type *Ty = MemOps[0].getTypeForEVT(*DAG.getContext()); 3624 unsigned NewAlign = (unsigned) TLI.getDataLayout()->getABITypeAlignment(Ty); 3625 if (NewAlign > Align) { 3626 // Give the stack frame object a larger alignment if needed. 3627 if (MFI->getObjectAlignment(FI->getIndex()) < NewAlign) 3628 MFI->setObjectAlignment(FI->getIndex(), NewAlign); 3629 Align = NewAlign; 3630 } 3631 } 3632 3633 uint64_t SrcOff = 0, DstOff = 0; 3634 SmallVector<SDValue, 8> LoadValues; 3635 SmallVector<SDValue, 8> LoadChains; 3636 SmallVector<SDValue, 8> OutChains; 3637 unsigned NumMemOps = MemOps.size(); 3638 for (unsigned i = 0; i < NumMemOps; i++) { 3639 EVT VT = MemOps[i]; 3640 unsigned VTSize = VT.getSizeInBits() / 8; 3641 SDValue Value, Store; 3642 3643 Value = DAG.getLoad(VT, dl, Chain, 3644 getMemBasePlusOffset(Src, SrcOff, DAG), 3645 SrcPtrInfo.getWithOffset(SrcOff), isVol, 3646 false, false, SrcAlign); 3647 LoadValues.push_back(Value); 3648 LoadChains.push_back(Value.getValue(1)); 3649 SrcOff += VTSize; 3650 } 3651 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, 3652 &LoadChains[0], LoadChains.size()); 3653 OutChains.clear(); 3654 for (unsigned i = 0; i < NumMemOps; i++) { 3655 EVT VT = MemOps[i]; 3656 unsigned VTSize = VT.getSizeInBits() / 8; 3657 SDValue Value, Store; 3658 3659 Store = DAG.getStore(Chain, dl, LoadValues[i], 3660 getMemBasePlusOffset(Dst, DstOff, DAG), 3661 DstPtrInfo.getWithOffset(DstOff), isVol, false, Align); 3662 OutChains.push_back(Store); 3663 DstOff += VTSize; 3664 } 3665 3666 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, 3667 &OutChains[0], OutChains.size()); 3668} 3669 3670static SDValue getMemsetStores(SelectionDAG &DAG, DebugLoc dl, 3671 SDValue Chain, SDValue Dst, 3672 SDValue Src, uint64_t Size, 3673 unsigned Align, bool isVol, 3674 MachinePointerInfo DstPtrInfo) { 3675 // Turn a memset of undef to nop. 3676 if (Src.getOpcode() == ISD::UNDEF) 3677 return Chain; 3678 3679 // Expand memset to a series of load/store ops if the size operand 3680 // falls below a certain threshold. 3681 const TargetLowering &TLI = DAG.getTargetLoweringInfo(); 3682 std::vector<EVT> MemOps; 3683 bool DstAlignCanChange = false; 3684 MachineFunction &MF = DAG.getMachineFunction(); 3685 MachineFrameInfo *MFI = MF.getFrameInfo(); 3686 bool OptSize = MF.getFunction()->getFnAttributes(). 3687 hasAttribute(Attributes::OptimizeForSize); 3688 FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(Dst); 3689 if (FI && !MFI->isFixedObjectIndex(FI->getIndex())) 3690 DstAlignCanChange = true; 3691 bool IsZeroVal = 3692 isa<ConstantSDNode>(Src) && cast<ConstantSDNode>(Src)->isNullValue(); 3693 if (!FindOptimalMemOpLowering(MemOps, TLI.getMaxStoresPerMemset(OptSize), 3694 Size, (DstAlignCanChange ? 0 : Align), 0, 3695 IsZeroVal, false, DAG, TLI)) 3696 return SDValue(); 3697 3698 if (DstAlignCanChange) { 3699 Type *Ty = MemOps[0].getTypeForEVT(*DAG.getContext()); 3700 unsigned NewAlign = (unsigned) TLI.getDataLayout()->getABITypeAlignment(Ty); 3701 if (NewAlign > Align) { 3702 // Give the stack frame object a larger alignment if needed. 3703 if (MFI->getObjectAlignment(FI->getIndex()) < NewAlign) 3704 MFI->setObjectAlignment(FI->getIndex(), NewAlign); 3705 Align = NewAlign; 3706 } 3707 } 3708 3709 SmallVector<SDValue, 8> OutChains; 3710 uint64_t DstOff = 0; 3711 unsigned NumMemOps = MemOps.size(); 3712 3713 // Find the largest store and generate the bit pattern for it. 3714 EVT LargestVT = MemOps[0]; 3715 for (unsigned i = 1; i < NumMemOps; i++) 3716 if (MemOps[i].bitsGT(LargestVT)) 3717 LargestVT = MemOps[i]; 3718 SDValue MemSetValue = getMemsetValue(Src, LargestVT, DAG, dl); 3719 3720 for (unsigned i = 0; i < NumMemOps; i++) { 3721 EVT VT = MemOps[i]; 3722 3723 // If this store is smaller than the largest store see whether we can get 3724 // the smaller value for free with a truncate. 3725 SDValue Value = MemSetValue; 3726 if (VT.bitsLT(LargestVT)) { 3727 if (!LargestVT.isVector() && !VT.isVector() && 3728 TLI.isTruncateFree(LargestVT, VT)) 3729 Value = DAG.getNode(ISD::TRUNCATE, dl, VT, MemSetValue); 3730 else 3731 Value = getMemsetValue(Src, VT, DAG, dl); 3732 } 3733 assert(Value.getValueType() == VT && "Value with wrong type."); 3734 SDValue Store = DAG.getStore(Chain, dl, Value, 3735 getMemBasePlusOffset(Dst, DstOff, DAG), 3736 DstPtrInfo.getWithOffset(DstOff), 3737 isVol, false, Align); 3738 OutChains.push_back(Store); 3739 DstOff += VT.getSizeInBits() / 8; 3740 } 3741 3742 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, 3743 &OutChains[0], OutChains.size()); 3744} 3745 3746SDValue SelectionDAG::getMemcpy(SDValue Chain, DebugLoc dl, SDValue Dst, 3747 SDValue Src, SDValue Size, 3748 unsigned Align, bool isVol, bool AlwaysInline, 3749 MachinePointerInfo DstPtrInfo, 3750 MachinePointerInfo SrcPtrInfo) { 3751 3752 // Check to see if we should lower the memcpy to loads and stores first. 3753 // For cases within the target-specified limits, this is the best choice. 3754 ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size); 3755 if (ConstantSize) { 3756 // Memcpy with size zero? Just return the original chain. 3757 if (ConstantSize->isNullValue()) 3758 return Chain; 3759 3760 SDValue Result = getMemcpyLoadsAndStores(*this, dl, Chain, Dst, Src, 3761 ConstantSize->getZExtValue(),Align, 3762 isVol, false, DstPtrInfo, SrcPtrInfo); 3763 if (Result.getNode()) 3764 return Result; 3765 } 3766 3767 // Then check to see if we should lower the memcpy with target-specific 3768 // code. If the target chooses to do this, this is the next best. 3769 SDValue Result = 3770 TSI.EmitTargetCodeForMemcpy(*this, dl, Chain, Dst, Src, Size, Align, 3771 isVol, AlwaysInline, 3772 DstPtrInfo, SrcPtrInfo); 3773 if (Result.getNode()) 3774 return Result; 3775 3776 // If we really need inline code and the target declined to provide it, 3777 // use a (potentially long) sequence of loads and stores. 3778 if (AlwaysInline) { 3779 assert(ConstantSize && "AlwaysInline requires a constant size!"); 3780 return getMemcpyLoadsAndStores(*this, dl, Chain, Dst, Src, 3781 ConstantSize->getZExtValue(), Align, isVol, 3782 true, DstPtrInfo, SrcPtrInfo); 3783 } 3784 3785 // FIXME: If the memcpy is volatile (isVol), lowering it to a plain libc 3786 // memcpy is not guaranteed to be safe. libc memcpys aren't required to 3787 // respect volatile, so they may do things like read or write memory 3788 // beyond the given memory regions. But fixing this isn't easy, and most 3789 // people don't care. 3790 3791 // Emit a library call. 3792 TargetLowering::ArgListTy Args; 3793 TargetLowering::ArgListEntry Entry; 3794 Entry.Ty = TLI.getDataLayout()->getIntPtrType(*getContext()); 3795 Entry.Node = Dst; Args.push_back(Entry); 3796 Entry.Node = Src; Args.push_back(Entry); 3797 Entry.Node = Size; Args.push_back(Entry); 3798 // FIXME: pass in DebugLoc 3799 TargetLowering:: 3800 CallLoweringInfo CLI(Chain, Type::getVoidTy(*getContext()), 3801 false, false, false, false, 0, 3802 TLI.getLibcallCallingConv(RTLIB::MEMCPY), 3803 /*isTailCall=*/false, 3804 /*doesNotReturn=*/false, /*isReturnValueUsed=*/false, 3805 getExternalSymbol(TLI.getLibcallName(RTLIB::MEMCPY), 3806 TLI.getPointerTy()), 3807 Args, *this, dl); 3808 std::pair<SDValue,SDValue> CallResult = TLI.LowerCallTo(CLI); 3809 3810 return CallResult.second; 3811} 3812 3813SDValue SelectionDAG::getMemmove(SDValue Chain, DebugLoc dl, SDValue Dst, 3814 SDValue Src, SDValue Size, 3815 unsigned Align, bool isVol, 3816 MachinePointerInfo DstPtrInfo, 3817 MachinePointerInfo SrcPtrInfo) { 3818 3819 // Check to see if we should lower the memmove to loads and stores first. 3820 // For cases within the target-specified limits, this is the best choice. 3821 ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size); 3822 if (ConstantSize) { 3823 // Memmove with size zero? Just return the original chain. 3824 if (ConstantSize->isNullValue()) 3825 return Chain; 3826 3827 SDValue Result = 3828 getMemmoveLoadsAndStores(*this, dl, Chain, Dst, Src, 3829 ConstantSize->getZExtValue(), Align, isVol, 3830 false, DstPtrInfo, SrcPtrInfo); 3831 if (Result.getNode()) 3832 return Result; 3833 } 3834 3835 // Then check to see if we should lower the memmove with target-specific 3836 // code. If the target chooses to do this, this is the next best. 3837 SDValue Result = 3838 TSI.EmitTargetCodeForMemmove(*this, dl, Chain, Dst, Src, Size, Align, isVol, 3839 DstPtrInfo, SrcPtrInfo); 3840 if (Result.getNode()) 3841 return Result; 3842 3843 // FIXME: If the memmove is volatile, lowering it to plain libc memmove may 3844 // not be safe. See memcpy above for more details. 3845 3846 // Emit a library call. 3847 TargetLowering::ArgListTy Args; 3848 TargetLowering::ArgListEntry Entry; 3849 Entry.Ty = TLI.getDataLayout()->getIntPtrType(*getContext()); 3850 Entry.Node = Dst; Args.push_back(Entry); 3851 Entry.Node = Src; Args.push_back(Entry); 3852 Entry.Node = Size; Args.push_back(Entry); 3853 // FIXME: pass in DebugLoc 3854 TargetLowering:: 3855 CallLoweringInfo CLI(Chain, Type::getVoidTy(*getContext()), 3856 false, false, false, false, 0, 3857 TLI.getLibcallCallingConv(RTLIB::MEMMOVE), 3858 /*isTailCall=*/false, 3859 /*doesNotReturn=*/false, /*isReturnValueUsed=*/false, 3860 getExternalSymbol(TLI.getLibcallName(RTLIB::MEMMOVE), 3861 TLI.getPointerTy()), 3862 Args, *this, dl); 3863 std::pair<SDValue,SDValue> CallResult = TLI.LowerCallTo(CLI); 3864 3865 return CallResult.second; 3866} 3867 3868SDValue SelectionDAG::getMemset(SDValue Chain, DebugLoc dl, SDValue Dst, 3869 SDValue Src, SDValue Size, 3870 unsigned Align, bool isVol, 3871 MachinePointerInfo DstPtrInfo) { 3872 3873 // Check to see if we should lower the memset to stores first. 3874 // For cases within the target-specified limits, this is the best choice. 3875 ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size); 3876 if (ConstantSize) { 3877 // Memset with size zero? Just return the original chain. 3878 if (ConstantSize->isNullValue()) 3879 return Chain; 3880 3881 SDValue Result = 3882 getMemsetStores(*this, dl, Chain, Dst, Src, ConstantSize->getZExtValue(), 3883 Align, isVol, DstPtrInfo); 3884 3885 if (Result.getNode()) 3886 return Result; 3887 } 3888 3889 // Then check to see if we should lower the memset with target-specific 3890 // code. If the target chooses to do this, this is the next best. 3891 SDValue Result = 3892 TSI.EmitTargetCodeForMemset(*this, dl, Chain, Dst, Src, Size, Align, isVol, 3893 DstPtrInfo); 3894 if (Result.getNode()) 3895 return Result; 3896 3897 // Emit a library call. 3898 Type *IntPtrTy = TLI.getDataLayout()->getIntPtrType(*getContext()); 3899 TargetLowering::ArgListTy Args; 3900 TargetLowering::ArgListEntry Entry; 3901 Entry.Node = Dst; Entry.Ty = IntPtrTy; 3902 Args.push_back(Entry); 3903 // Extend or truncate the argument to be an i32 value for the call. 3904 if (Src.getValueType().bitsGT(MVT::i32)) 3905 Src = getNode(ISD::TRUNCATE, dl, MVT::i32, Src); 3906 else 3907 Src = getNode(ISD::ZERO_EXTEND, dl, MVT::i32, Src); 3908 Entry.Node = Src; 3909 Entry.Ty = Type::getInt32Ty(*getContext()); 3910 Entry.isSExt = true; 3911 Args.push_back(Entry); 3912 Entry.Node = Size; 3913 Entry.Ty = IntPtrTy; 3914 Entry.isSExt = false; 3915 Args.push_back(Entry); 3916 // FIXME: pass in DebugLoc 3917 TargetLowering:: 3918 CallLoweringInfo CLI(Chain, Type::getVoidTy(*getContext()), 3919 false, false, false, false, 0, 3920 TLI.getLibcallCallingConv(RTLIB::MEMSET), 3921 /*isTailCall=*/false, 3922 /*doesNotReturn*/false, /*isReturnValueUsed=*/false, 3923 getExternalSymbol(TLI.getLibcallName(RTLIB::MEMSET), 3924 TLI.getPointerTy()), 3925 Args, *this, dl); 3926 std::pair<SDValue,SDValue> CallResult = TLI.LowerCallTo(CLI); 3927 3928 return CallResult.second; 3929} 3930 3931SDValue SelectionDAG::getAtomic(unsigned Opcode, DebugLoc dl, EVT MemVT, 3932 SDValue Chain, SDValue Ptr, SDValue Cmp, 3933 SDValue Swp, MachinePointerInfo PtrInfo, 3934 unsigned Alignment, 3935 AtomicOrdering Ordering, 3936 SynchronizationScope SynchScope) { 3937 if (Alignment == 0) // Ensure that codegen never sees alignment 0 3938 Alignment = getEVTAlignment(MemVT); 3939 3940 MachineFunction &MF = getMachineFunction(); 3941 3942 // All atomics are load and store, except for ATMOIC_LOAD and ATOMIC_STORE. 3943 // For now, atomics are considered to be volatile always. 3944 // FIXME: Volatile isn't really correct; we should keep track of atomic 3945 // orderings in the memoperand. 3946 unsigned Flags = MachineMemOperand::MOVolatile; 3947 if (Opcode != ISD::ATOMIC_STORE) 3948 Flags |= MachineMemOperand::MOLoad; 3949 if (Opcode != ISD::ATOMIC_LOAD) 3950 Flags |= MachineMemOperand::MOStore; 3951 3952 MachineMemOperand *MMO = 3953 MF.getMachineMemOperand(PtrInfo, Flags, MemVT.getStoreSize(), Alignment); 3954 3955 return getAtomic(Opcode, dl, MemVT, Chain, Ptr, Cmp, Swp, MMO, 3956 Ordering, SynchScope); 3957} 3958 3959SDValue SelectionDAG::getAtomic(unsigned Opcode, DebugLoc dl, EVT MemVT, 3960 SDValue Chain, 3961 SDValue Ptr, SDValue Cmp, 3962 SDValue Swp, MachineMemOperand *MMO, 3963 AtomicOrdering Ordering, 3964 SynchronizationScope SynchScope) { 3965 assert(Opcode == ISD::ATOMIC_CMP_SWAP && "Invalid Atomic Op"); 3966 assert(Cmp.getValueType() == Swp.getValueType() && "Invalid Atomic Op Types"); 3967 3968 EVT VT = Cmp.getValueType(); 3969 3970 SDVTList VTs = getVTList(VT, MVT::Other); 3971 FoldingSetNodeID ID; 3972 ID.AddInteger(MemVT.getRawBits()); 3973 SDValue Ops[] = {Chain, Ptr, Cmp, Swp}; 3974 AddNodeIDNode(ID, Opcode, VTs, Ops, 4); 3975 ID.AddInteger(MMO->getPointerInfo().getAddrSpace()); 3976 void* IP = 0; 3977 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) { 3978 cast<AtomicSDNode>(E)->refineAlignment(MMO); 3979 return SDValue(E, 0); 3980 } 3981 SDNode *N = new (NodeAllocator) AtomicSDNode(Opcode, dl, VTs, MemVT, Chain, 3982 Ptr, Cmp, Swp, MMO, Ordering, 3983 SynchScope); 3984 CSEMap.InsertNode(N, IP); 3985 AllNodes.push_back(N); 3986 return SDValue(N, 0); 3987} 3988 3989SDValue SelectionDAG::getAtomic(unsigned Opcode, DebugLoc dl, EVT MemVT, 3990 SDValue Chain, 3991 SDValue Ptr, SDValue Val, 3992 const Value* PtrVal, 3993 unsigned Alignment, 3994 AtomicOrdering Ordering, 3995 SynchronizationScope SynchScope) { 3996 if (Alignment == 0) // Ensure that codegen never sees alignment 0 3997 Alignment = getEVTAlignment(MemVT); 3998 3999 MachineFunction &MF = getMachineFunction(); 4000 // An atomic store does not load. An atomic load does not store. 4001 // (An atomicrmw obviously both loads and stores.) 4002 // For now, atomics are considered to be volatile always, and they are 4003 // chained as such. 4004 // FIXME: Volatile isn't really correct; we should keep track of atomic 4005 // orderings in the memoperand. 4006 unsigned Flags = MachineMemOperand::MOVolatile; 4007 if (Opcode != ISD::ATOMIC_STORE) 4008 Flags |= MachineMemOperand::MOLoad; 4009 if (Opcode != ISD::ATOMIC_LOAD) 4010 Flags |= MachineMemOperand::MOStore; 4011 4012 MachineMemOperand *MMO = 4013 MF.getMachineMemOperand(MachinePointerInfo(PtrVal), Flags, 4014 MemVT.getStoreSize(), Alignment); 4015 4016 return getAtomic(Opcode, dl, MemVT, Chain, Ptr, Val, MMO, 4017 Ordering, SynchScope); 4018} 4019 4020SDValue SelectionDAG::getAtomic(unsigned Opcode, DebugLoc dl, EVT MemVT, 4021 SDValue Chain, 4022 SDValue Ptr, SDValue Val, 4023 MachineMemOperand *MMO, 4024 AtomicOrdering Ordering, 4025 SynchronizationScope SynchScope) { 4026 assert((Opcode == ISD::ATOMIC_LOAD_ADD || 4027 Opcode == ISD::ATOMIC_LOAD_SUB || 4028 Opcode == ISD::ATOMIC_LOAD_AND || 4029 Opcode == ISD::ATOMIC_LOAD_OR || 4030 Opcode == ISD::ATOMIC_LOAD_XOR || 4031 Opcode == ISD::ATOMIC_LOAD_NAND || 4032 Opcode == ISD::ATOMIC_LOAD_MIN || 4033 Opcode == ISD::ATOMIC_LOAD_MAX || 4034 Opcode == ISD::ATOMIC_LOAD_UMIN || 4035 Opcode == ISD::ATOMIC_LOAD_UMAX || 4036 Opcode == ISD::ATOMIC_SWAP || 4037 Opcode == ISD::ATOMIC_STORE) && 4038 "Invalid Atomic Op"); 4039 4040 EVT VT = Val.getValueType(); 4041 4042 SDVTList VTs = Opcode == ISD::ATOMIC_STORE ? getVTList(MVT::Other) : 4043 getVTList(VT, MVT::Other); 4044 FoldingSetNodeID ID; 4045 ID.AddInteger(MemVT.getRawBits()); 4046 SDValue Ops[] = {Chain, Ptr, Val}; 4047 AddNodeIDNode(ID, Opcode, VTs, Ops, 3); 4048 ID.AddInteger(MMO->getPointerInfo().getAddrSpace()); 4049 void* IP = 0; 4050 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) { 4051 cast<AtomicSDNode>(E)->refineAlignment(MMO); 4052 return SDValue(E, 0); 4053 } 4054 SDNode *N = new (NodeAllocator) AtomicSDNode(Opcode, dl, VTs, MemVT, Chain, 4055 Ptr, Val, MMO, 4056 Ordering, SynchScope); 4057 CSEMap.InsertNode(N, IP); 4058 AllNodes.push_back(N); 4059 return SDValue(N, 0); 4060} 4061 4062SDValue SelectionDAG::getAtomic(unsigned Opcode, DebugLoc dl, EVT MemVT, 4063 EVT VT, SDValue Chain, 4064 SDValue Ptr, 4065 const Value* PtrVal, 4066 unsigned Alignment, 4067 AtomicOrdering Ordering, 4068 SynchronizationScope SynchScope) { 4069 if (Alignment == 0) // Ensure that codegen never sees alignment 0 4070 Alignment = getEVTAlignment(MemVT); 4071 4072 MachineFunction &MF = getMachineFunction(); 4073 // An atomic store does not load. An atomic load does not store. 4074 // (An atomicrmw obviously both loads and stores.) 4075 // For now, atomics are considered to be volatile always, and they are 4076 // chained as such. 4077 // FIXME: Volatile isn't really correct; we should keep track of atomic 4078 // orderings in the memoperand. 4079 unsigned Flags = MachineMemOperand::MOVolatile; 4080 if (Opcode != ISD::ATOMIC_STORE) 4081 Flags |= MachineMemOperand::MOLoad; 4082 if (Opcode != ISD::ATOMIC_LOAD) 4083 Flags |= MachineMemOperand::MOStore; 4084 4085 MachineMemOperand *MMO = 4086 MF.getMachineMemOperand(MachinePointerInfo(PtrVal), Flags, 4087 MemVT.getStoreSize(), Alignment); 4088 4089 return getAtomic(Opcode, dl, MemVT, VT, Chain, Ptr, MMO, 4090 Ordering, SynchScope); 4091} 4092 4093SDValue SelectionDAG::getAtomic(unsigned Opcode, DebugLoc dl, EVT MemVT, 4094 EVT VT, SDValue Chain, 4095 SDValue Ptr, 4096 MachineMemOperand *MMO, 4097 AtomicOrdering Ordering, 4098 SynchronizationScope SynchScope) { 4099 assert(Opcode == ISD::ATOMIC_LOAD && "Invalid Atomic Op"); 4100 4101 SDVTList VTs = getVTList(VT, MVT::Other); 4102 FoldingSetNodeID ID; 4103 ID.AddInteger(MemVT.getRawBits()); 4104 SDValue Ops[] = {Chain, Ptr}; 4105 AddNodeIDNode(ID, Opcode, VTs, Ops, 2); 4106 ID.AddInteger(MMO->getPointerInfo().getAddrSpace()); 4107 void* IP = 0; 4108 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) { 4109 cast<AtomicSDNode>(E)->refineAlignment(MMO); 4110 return SDValue(E, 0); 4111 } 4112 SDNode *N = new (NodeAllocator) AtomicSDNode(Opcode, dl, VTs, MemVT, Chain, 4113 Ptr, MMO, Ordering, SynchScope); 4114 CSEMap.InsertNode(N, IP); 4115 AllNodes.push_back(N); 4116 return SDValue(N, 0); 4117} 4118 4119/// getMergeValues - Create a MERGE_VALUES node from the given operands. 4120SDValue SelectionDAG::getMergeValues(const SDValue *Ops, unsigned NumOps, 4121 DebugLoc dl) { 4122 if (NumOps == 1) 4123 return Ops[0]; 4124 4125 SmallVector<EVT, 4> VTs; 4126 VTs.reserve(NumOps); 4127 for (unsigned i = 0; i < NumOps; ++i) 4128 VTs.push_back(Ops[i].getValueType()); 4129 return getNode(ISD::MERGE_VALUES, dl, getVTList(&VTs[0], NumOps), 4130 Ops, NumOps); 4131} 4132 4133SDValue 4134SelectionDAG::getMemIntrinsicNode(unsigned Opcode, DebugLoc dl, 4135 const EVT *VTs, unsigned NumVTs, 4136 const SDValue *Ops, unsigned NumOps, 4137 EVT MemVT, MachinePointerInfo PtrInfo, 4138 unsigned Align, bool Vol, 4139 bool ReadMem, bool WriteMem) { 4140 return getMemIntrinsicNode(Opcode, dl, makeVTList(VTs, NumVTs), Ops, NumOps, 4141 MemVT, PtrInfo, Align, Vol, 4142 ReadMem, WriteMem); 4143} 4144 4145SDValue 4146SelectionDAG::getMemIntrinsicNode(unsigned Opcode, DebugLoc dl, SDVTList VTList, 4147 const SDValue *Ops, unsigned NumOps, 4148 EVT MemVT, MachinePointerInfo PtrInfo, 4149 unsigned Align, bool Vol, 4150 bool ReadMem, bool WriteMem) { 4151 if (Align == 0) // Ensure that codegen never sees alignment 0 4152 Align = getEVTAlignment(MemVT); 4153 4154 MachineFunction &MF = getMachineFunction(); 4155 unsigned Flags = 0; 4156 if (WriteMem) 4157 Flags |= MachineMemOperand::MOStore; 4158 if (ReadMem) 4159 Flags |= MachineMemOperand::MOLoad; 4160 if (Vol) 4161 Flags |= MachineMemOperand::MOVolatile; 4162 MachineMemOperand *MMO = 4163 MF.getMachineMemOperand(PtrInfo, Flags, MemVT.getStoreSize(), Align); 4164 4165 return getMemIntrinsicNode(Opcode, dl, VTList, Ops, NumOps, MemVT, MMO); 4166} 4167 4168SDValue 4169SelectionDAG::getMemIntrinsicNode(unsigned Opcode, DebugLoc dl, SDVTList VTList, 4170 const SDValue *Ops, unsigned NumOps, 4171 EVT MemVT, MachineMemOperand *MMO) { 4172 assert((Opcode == ISD::INTRINSIC_VOID || 4173 Opcode == ISD::INTRINSIC_W_CHAIN || 4174 Opcode == ISD::PREFETCH || 4175 Opcode == ISD::LIFETIME_START || 4176 Opcode == ISD::LIFETIME_END || 4177 (Opcode <= INT_MAX && 4178 (int)Opcode >= ISD::FIRST_TARGET_MEMORY_OPCODE)) && 4179 "Opcode is not a memory-accessing opcode!"); 4180 4181 // Memoize the node unless it returns a flag. 4182 MemIntrinsicSDNode *N; 4183 if (VTList.VTs[VTList.NumVTs-1] != MVT::Glue) { 4184 FoldingSetNodeID ID; 4185 AddNodeIDNode(ID, Opcode, VTList, Ops, NumOps); 4186 ID.AddInteger(MMO->getPointerInfo().getAddrSpace()); 4187 void *IP = 0; 4188 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) { 4189 cast<MemIntrinsicSDNode>(E)->refineAlignment(MMO); 4190 return SDValue(E, 0); 4191 } 4192 4193 N = new (NodeAllocator) MemIntrinsicSDNode(Opcode, dl, VTList, Ops, NumOps, 4194 MemVT, MMO); 4195 CSEMap.InsertNode(N, IP); 4196 } else { 4197 N = new (NodeAllocator) MemIntrinsicSDNode(Opcode, dl, VTList, Ops, NumOps, 4198 MemVT, MMO); 4199 } 4200 AllNodes.push_back(N); 4201 return SDValue(N, 0); 4202} 4203 4204/// InferPointerInfo - If the specified ptr/offset is a frame index, infer a 4205/// MachinePointerInfo record from it. This is particularly useful because the 4206/// code generator has many cases where it doesn't bother passing in a 4207/// MachinePointerInfo to getLoad or getStore when it has "FI+Cst". 4208static MachinePointerInfo InferPointerInfo(SDValue Ptr, int64_t Offset = 0) { 4209 // If this is FI+Offset, we can model it. 4210 if (const FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(Ptr)) 4211 return MachinePointerInfo::getFixedStack(FI->getIndex(), Offset); 4212 4213 // If this is (FI+Offset1)+Offset2, we can model it. 4214 if (Ptr.getOpcode() != ISD::ADD || 4215 !isa<ConstantSDNode>(Ptr.getOperand(1)) || 4216 !isa<FrameIndexSDNode>(Ptr.getOperand(0))) 4217 return MachinePointerInfo(); 4218 4219 int FI = cast<FrameIndexSDNode>(Ptr.getOperand(0))->getIndex(); 4220 return MachinePointerInfo::getFixedStack(FI, Offset+ 4221 cast<ConstantSDNode>(Ptr.getOperand(1))->getSExtValue()); 4222} 4223 4224/// InferPointerInfo - If the specified ptr/offset is a frame index, infer a 4225/// MachinePointerInfo record from it. This is particularly useful because the 4226/// code generator has many cases where it doesn't bother passing in a 4227/// MachinePointerInfo to getLoad or getStore when it has "FI+Cst". 4228static MachinePointerInfo InferPointerInfo(SDValue Ptr, SDValue OffsetOp) { 4229 // If the 'Offset' value isn't a constant, we can't handle this. 4230 if (ConstantSDNode *OffsetNode = dyn_cast<ConstantSDNode>(OffsetOp)) 4231 return InferPointerInfo(Ptr, OffsetNode->getSExtValue()); 4232 if (OffsetOp.getOpcode() == ISD::UNDEF) 4233 return InferPointerInfo(Ptr); 4234 return MachinePointerInfo(); 4235} 4236 4237 4238SDValue 4239SelectionDAG::getLoad(ISD::MemIndexedMode AM, ISD::LoadExtType ExtType, 4240 EVT VT, DebugLoc dl, SDValue Chain, 4241 SDValue Ptr, SDValue Offset, 4242 MachinePointerInfo PtrInfo, EVT MemVT, 4243 bool isVolatile, bool isNonTemporal, bool isInvariant, 4244 unsigned Alignment, const MDNode *TBAAInfo, 4245 const MDNode *Ranges) { 4246 assert(Chain.getValueType() == MVT::Other && 4247 "Invalid chain type"); 4248 if (Alignment == 0) // Ensure that codegen never sees alignment 0 4249 Alignment = getEVTAlignment(VT); 4250 4251 unsigned Flags = MachineMemOperand::MOLoad; 4252 if (isVolatile) 4253 Flags |= MachineMemOperand::MOVolatile; 4254 if (isNonTemporal) 4255 Flags |= MachineMemOperand::MONonTemporal; 4256 if (isInvariant) 4257 Flags |= MachineMemOperand::MOInvariant; 4258 4259 // If we don't have a PtrInfo, infer the trivial frame index case to simplify 4260 // clients. 4261 if (PtrInfo.V == 0) 4262 PtrInfo = InferPointerInfo(Ptr, Offset); 4263 4264 MachineFunction &MF = getMachineFunction(); 4265 MachineMemOperand *MMO = 4266 MF.getMachineMemOperand(PtrInfo, Flags, MemVT.getStoreSize(), Alignment, 4267 TBAAInfo, Ranges); 4268 return getLoad(AM, ExtType, VT, dl, Chain, Ptr, Offset, MemVT, MMO); 4269} 4270 4271SDValue 4272SelectionDAG::getLoad(ISD::MemIndexedMode AM, ISD::LoadExtType ExtType, 4273 EVT VT, DebugLoc dl, SDValue Chain, 4274 SDValue Ptr, SDValue Offset, EVT MemVT, 4275 MachineMemOperand *MMO) { 4276 if (VT == MemVT) { 4277 ExtType = ISD::NON_EXTLOAD; 4278 } else if (ExtType == ISD::NON_EXTLOAD) { 4279 assert(VT == MemVT && "Non-extending load from different memory type!"); 4280 } else { 4281 // Extending load. 4282 assert(MemVT.getScalarType().bitsLT(VT.getScalarType()) && 4283 "Should only be an extending load, not truncating!"); 4284 assert(VT.isInteger() == MemVT.isInteger() && 4285 "Cannot convert from FP to Int or Int -> FP!"); 4286 assert(VT.isVector() == MemVT.isVector() && 4287 "Cannot use trunc store to convert to or from a vector!"); 4288 assert((!VT.isVector() || 4289 VT.getVectorNumElements() == MemVT.getVectorNumElements()) && 4290 "Cannot use trunc store to change the number of vector elements!"); 4291 } 4292 4293 bool Indexed = AM != ISD::UNINDEXED; 4294 assert((Indexed || Offset.getOpcode() == ISD::UNDEF) && 4295 "Unindexed load with an offset!"); 4296 4297 SDVTList VTs = Indexed ? 4298 getVTList(VT, Ptr.getValueType(), MVT::Other) : getVTList(VT, MVT::Other); 4299 SDValue Ops[] = { Chain, Ptr, Offset }; 4300 FoldingSetNodeID ID; 4301 AddNodeIDNode(ID, ISD::LOAD, VTs, Ops, 3); 4302 ID.AddInteger(MemVT.getRawBits()); 4303 ID.AddInteger(encodeMemSDNodeFlags(ExtType, AM, MMO->isVolatile(), 4304 MMO->isNonTemporal(), 4305 MMO->isInvariant())); 4306 ID.AddInteger(MMO->getPointerInfo().getAddrSpace()); 4307 void *IP = 0; 4308 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) { 4309 cast<LoadSDNode>(E)->refineAlignment(MMO); 4310 return SDValue(E, 0); 4311 } 4312 SDNode *N = new (NodeAllocator) LoadSDNode(Ops, dl, VTs, AM, ExtType, 4313 MemVT, MMO); 4314 CSEMap.InsertNode(N, IP); 4315 AllNodes.push_back(N); 4316 return SDValue(N, 0); 4317} 4318 4319SDValue SelectionDAG::getLoad(EVT VT, DebugLoc dl, 4320 SDValue Chain, SDValue Ptr, 4321 MachinePointerInfo PtrInfo, 4322 bool isVolatile, bool isNonTemporal, 4323 bool isInvariant, unsigned Alignment, 4324 const MDNode *TBAAInfo, 4325 const MDNode *Ranges) { 4326 SDValue Undef = getUNDEF(Ptr.getValueType()); 4327 return getLoad(ISD::UNINDEXED, ISD::NON_EXTLOAD, VT, dl, Chain, Ptr, Undef, 4328 PtrInfo, VT, isVolatile, isNonTemporal, isInvariant, Alignment, 4329 TBAAInfo, Ranges); 4330} 4331 4332SDValue SelectionDAG::getExtLoad(ISD::LoadExtType ExtType, DebugLoc dl, EVT VT, 4333 SDValue Chain, SDValue Ptr, 4334 MachinePointerInfo PtrInfo, EVT MemVT, 4335 bool isVolatile, bool isNonTemporal, 4336 unsigned Alignment, const MDNode *TBAAInfo) { 4337 SDValue Undef = getUNDEF(Ptr.getValueType()); 4338 return getLoad(ISD::UNINDEXED, ExtType, VT, dl, Chain, Ptr, Undef, 4339 PtrInfo, MemVT, isVolatile, isNonTemporal, false, Alignment, 4340 TBAAInfo); 4341} 4342 4343 4344SDValue 4345SelectionDAG::getIndexedLoad(SDValue OrigLoad, DebugLoc dl, SDValue Base, 4346 SDValue Offset, ISD::MemIndexedMode AM) { 4347 LoadSDNode *LD = cast<LoadSDNode>(OrigLoad); 4348 assert(LD->getOffset().getOpcode() == ISD::UNDEF && 4349 "Load is already a indexed load!"); 4350 return getLoad(AM, LD->getExtensionType(), OrigLoad.getValueType(), dl, 4351 LD->getChain(), Base, Offset, LD->getPointerInfo(), 4352 LD->getMemoryVT(), LD->isVolatile(), LD->isNonTemporal(), 4353 false, LD->getAlignment()); 4354} 4355 4356SDValue SelectionDAG::getStore(SDValue Chain, DebugLoc dl, SDValue Val, 4357 SDValue Ptr, MachinePointerInfo PtrInfo, 4358 bool isVolatile, bool isNonTemporal, 4359 unsigned Alignment, const MDNode *TBAAInfo) { 4360 assert(Chain.getValueType() == MVT::Other && 4361 "Invalid chain type"); 4362 if (Alignment == 0) // Ensure that codegen never sees alignment 0 4363 Alignment = getEVTAlignment(Val.getValueType()); 4364 4365 unsigned Flags = MachineMemOperand::MOStore; 4366 if (isVolatile) 4367 Flags |= MachineMemOperand::MOVolatile; 4368 if (isNonTemporal) 4369 Flags |= MachineMemOperand::MONonTemporal; 4370 4371 if (PtrInfo.V == 0) 4372 PtrInfo = InferPointerInfo(Ptr); 4373 4374 MachineFunction &MF = getMachineFunction(); 4375 MachineMemOperand *MMO = 4376 MF.getMachineMemOperand(PtrInfo, Flags, 4377 Val.getValueType().getStoreSize(), Alignment, 4378 TBAAInfo); 4379 4380 return getStore(Chain, dl, Val, Ptr, MMO); 4381} 4382 4383SDValue SelectionDAG::getStore(SDValue Chain, DebugLoc dl, SDValue Val, 4384 SDValue Ptr, MachineMemOperand *MMO) { 4385 assert(Chain.getValueType() == MVT::Other && 4386 "Invalid chain type"); 4387 EVT VT = Val.getValueType(); 4388 SDVTList VTs = getVTList(MVT::Other); 4389 SDValue Undef = getUNDEF(Ptr.getValueType()); 4390 SDValue Ops[] = { Chain, Val, Ptr, Undef }; 4391 FoldingSetNodeID ID; 4392 AddNodeIDNode(ID, ISD::STORE, VTs, Ops, 4); 4393 ID.AddInteger(VT.getRawBits()); 4394 ID.AddInteger(encodeMemSDNodeFlags(false, ISD::UNINDEXED, MMO->isVolatile(), 4395 MMO->isNonTemporal(), MMO->isInvariant())); 4396 ID.AddInteger(MMO->getPointerInfo().getAddrSpace()); 4397 void *IP = 0; 4398 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) { 4399 cast<StoreSDNode>(E)->refineAlignment(MMO); 4400 return SDValue(E, 0); 4401 } 4402 SDNode *N = new (NodeAllocator) StoreSDNode(Ops, dl, VTs, ISD::UNINDEXED, 4403 false, VT, MMO); 4404 CSEMap.InsertNode(N, IP); 4405 AllNodes.push_back(N); 4406 return SDValue(N, 0); 4407} 4408 4409SDValue SelectionDAG::getTruncStore(SDValue Chain, DebugLoc dl, SDValue Val, 4410 SDValue Ptr, MachinePointerInfo PtrInfo, 4411 EVT SVT,bool isVolatile, bool isNonTemporal, 4412 unsigned Alignment, 4413 const MDNode *TBAAInfo) { 4414 assert(Chain.getValueType() == MVT::Other && 4415 "Invalid chain type"); 4416 if (Alignment == 0) // Ensure that codegen never sees alignment 0 4417 Alignment = getEVTAlignment(SVT); 4418 4419 unsigned Flags = MachineMemOperand::MOStore; 4420 if (isVolatile) 4421 Flags |= MachineMemOperand::MOVolatile; 4422 if (isNonTemporal) 4423 Flags |= MachineMemOperand::MONonTemporal; 4424 4425 if (PtrInfo.V == 0) 4426 PtrInfo = InferPointerInfo(Ptr); 4427 4428 MachineFunction &MF = getMachineFunction(); 4429 MachineMemOperand *MMO = 4430 MF.getMachineMemOperand(PtrInfo, Flags, SVT.getStoreSize(), Alignment, 4431 TBAAInfo); 4432 4433 return getTruncStore(Chain, dl, Val, Ptr, SVT, MMO); 4434} 4435 4436SDValue SelectionDAG::getTruncStore(SDValue Chain, DebugLoc dl, SDValue Val, 4437 SDValue Ptr, EVT SVT, 4438 MachineMemOperand *MMO) { 4439 EVT VT = Val.getValueType(); 4440 4441 assert(Chain.getValueType() == MVT::Other && 4442 "Invalid chain type"); 4443 if (VT == SVT) 4444 return getStore(Chain, dl, Val, Ptr, MMO); 4445 4446 assert(SVT.getScalarType().bitsLT(VT.getScalarType()) && 4447 "Should only be a truncating store, not extending!"); 4448 assert(VT.isInteger() == SVT.isInteger() && 4449 "Can't do FP-INT conversion!"); 4450 assert(VT.isVector() == SVT.isVector() && 4451 "Cannot use trunc store to convert to or from a vector!"); 4452 assert((!VT.isVector() || 4453 VT.getVectorNumElements() == SVT.getVectorNumElements()) && 4454 "Cannot use trunc store to change the number of vector elements!"); 4455 4456 SDVTList VTs = getVTList(MVT::Other); 4457 SDValue Undef = getUNDEF(Ptr.getValueType()); 4458 SDValue Ops[] = { Chain, Val, Ptr, Undef }; 4459 FoldingSetNodeID ID; 4460 AddNodeIDNode(ID, ISD::STORE, VTs, Ops, 4); 4461 ID.AddInteger(SVT.getRawBits()); 4462 ID.AddInteger(encodeMemSDNodeFlags(true, ISD::UNINDEXED, MMO->isVolatile(), 4463 MMO->isNonTemporal(), MMO->isInvariant())); 4464 ID.AddInteger(MMO->getPointerInfo().getAddrSpace()); 4465 void *IP = 0; 4466 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) { 4467 cast<StoreSDNode>(E)->refineAlignment(MMO); 4468 return SDValue(E, 0); 4469 } 4470 SDNode *N = new (NodeAllocator) StoreSDNode(Ops, dl, VTs, ISD::UNINDEXED, 4471 true, SVT, MMO); 4472 CSEMap.InsertNode(N, IP); 4473 AllNodes.push_back(N); 4474 return SDValue(N, 0); 4475} 4476 4477SDValue 4478SelectionDAG::getIndexedStore(SDValue OrigStore, DebugLoc dl, SDValue Base, 4479 SDValue Offset, ISD::MemIndexedMode AM) { 4480 StoreSDNode *ST = cast<StoreSDNode>(OrigStore); 4481 assert(ST->getOffset().getOpcode() == ISD::UNDEF && 4482 "Store is already a indexed store!"); 4483 SDVTList VTs = getVTList(Base.getValueType(), MVT::Other); 4484 SDValue Ops[] = { ST->getChain(), ST->getValue(), Base, Offset }; 4485 FoldingSetNodeID ID; 4486 AddNodeIDNode(ID, ISD::STORE, VTs, Ops, 4); 4487 ID.AddInteger(ST->getMemoryVT().getRawBits()); 4488 ID.AddInteger(ST->getRawSubclassData()); 4489 ID.AddInteger(ST->getPointerInfo().getAddrSpace()); 4490 void *IP = 0; 4491 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 4492 return SDValue(E, 0); 4493 4494 SDNode *N = new (NodeAllocator) StoreSDNode(Ops, dl, VTs, AM, 4495 ST->isTruncatingStore(), 4496 ST->getMemoryVT(), 4497 ST->getMemOperand()); 4498 CSEMap.InsertNode(N, IP); 4499 AllNodes.push_back(N); 4500 return SDValue(N, 0); 4501} 4502 4503SDValue SelectionDAG::getVAArg(EVT VT, DebugLoc dl, 4504 SDValue Chain, SDValue Ptr, 4505 SDValue SV, 4506 unsigned Align) { 4507 SDValue Ops[] = { Chain, Ptr, SV, getTargetConstant(Align, MVT::i32) }; 4508 return getNode(ISD::VAARG, dl, getVTList(VT, MVT::Other), Ops, 4); 4509} 4510 4511SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, EVT VT, 4512 const SDUse *Ops, unsigned NumOps) { 4513 switch (NumOps) { 4514 case 0: return getNode(Opcode, DL, VT); 4515 case 1: return getNode(Opcode, DL, VT, Ops[0]); 4516 case 2: return getNode(Opcode, DL, VT, Ops[0], Ops[1]); 4517 case 3: return getNode(Opcode, DL, VT, Ops[0], Ops[1], Ops[2]); 4518 default: break; 4519 } 4520 4521 // Copy from an SDUse array into an SDValue array for use with 4522 // the regular getNode logic. 4523 SmallVector<SDValue, 8> NewOps(Ops, Ops + NumOps); 4524 return getNode(Opcode, DL, VT, &NewOps[0], NumOps); 4525} 4526 4527SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, EVT VT, 4528 const SDValue *Ops, unsigned NumOps) { 4529 switch (NumOps) { 4530 case 0: return getNode(Opcode, DL, VT); 4531 case 1: return getNode(Opcode, DL, VT, Ops[0]); 4532 case 2: return getNode(Opcode, DL, VT, Ops[0], Ops[1]); 4533 case 3: return getNode(Opcode, DL, VT, Ops[0], Ops[1], Ops[2]); 4534 default: break; 4535 } 4536 4537 switch (Opcode) { 4538 default: break; 4539 case ISD::SELECT_CC: { 4540 assert(NumOps == 5 && "SELECT_CC takes 5 operands!"); 4541 assert(Ops[0].getValueType() == Ops[1].getValueType() && 4542 "LHS and RHS of condition must have same type!"); 4543 assert(Ops[2].getValueType() == Ops[3].getValueType() && 4544 "True and False arms of SelectCC must have same type!"); 4545 assert(Ops[2].getValueType() == VT && 4546 "select_cc node must be of same type as true and false value!"); 4547 break; 4548 } 4549 case ISD::BR_CC: { 4550 assert(NumOps == 5 && "BR_CC takes 5 operands!"); 4551 assert(Ops[2].getValueType() == Ops[3].getValueType() && 4552 "LHS/RHS of comparison should match types!"); 4553 break; 4554 } 4555 } 4556 4557 // Memoize nodes. 4558 SDNode *N; 4559 SDVTList VTs = getVTList(VT); 4560 4561 if (VT != MVT::Glue) { 4562 FoldingSetNodeID ID; 4563 AddNodeIDNode(ID, Opcode, VTs, Ops, NumOps); 4564 void *IP = 0; 4565 4566 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 4567 return SDValue(E, 0); 4568 4569 N = new (NodeAllocator) SDNode(Opcode, DL, VTs, Ops, NumOps); 4570 CSEMap.InsertNode(N, IP); 4571 } else { 4572 N = new (NodeAllocator) SDNode(Opcode, DL, VTs, Ops, NumOps); 4573 } 4574 4575 AllNodes.push_back(N); 4576#ifndef NDEBUG 4577 VerifySDNode(N); 4578#endif 4579 return SDValue(N, 0); 4580} 4581 4582SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, 4583 const std::vector<EVT> &ResultTys, 4584 const SDValue *Ops, unsigned NumOps) { 4585 return getNode(Opcode, DL, getVTList(&ResultTys[0], ResultTys.size()), 4586 Ops, NumOps); 4587} 4588 4589SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, 4590 const EVT *VTs, unsigned NumVTs, 4591 const SDValue *Ops, unsigned NumOps) { 4592 if (NumVTs == 1) 4593 return getNode(Opcode, DL, VTs[0], Ops, NumOps); 4594 return getNode(Opcode, DL, makeVTList(VTs, NumVTs), Ops, NumOps); 4595} 4596 4597SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList, 4598 const SDValue *Ops, unsigned NumOps) { 4599 if (VTList.NumVTs == 1) 4600 return getNode(Opcode, DL, VTList.VTs[0], Ops, NumOps); 4601 4602#if 0 4603 switch (Opcode) { 4604 // FIXME: figure out how to safely handle things like 4605 // int foo(int x) { return 1 << (x & 255); } 4606 // int bar() { return foo(256); } 4607 case ISD::SRA_PARTS: 4608 case ISD::SRL_PARTS: 4609 case ISD::SHL_PARTS: 4610 if (N3.getOpcode() == ISD::SIGN_EXTEND_INREG && 4611 cast<VTSDNode>(N3.getOperand(1))->getVT() != MVT::i1) 4612 return getNode(Opcode, DL, VT, N1, N2, N3.getOperand(0)); 4613 else if (N3.getOpcode() == ISD::AND) 4614 if (ConstantSDNode *AndRHS = dyn_cast<ConstantSDNode>(N3.getOperand(1))) { 4615 // If the and is only masking out bits that cannot effect the shift, 4616 // eliminate the and. 4617 unsigned NumBits = VT.getScalarType().getSizeInBits()*2; 4618 if ((AndRHS->getValue() & (NumBits-1)) == NumBits-1) 4619 return getNode(Opcode, DL, VT, N1, N2, N3.getOperand(0)); 4620 } 4621 break; 4622 } 4623#endif 4624 4625 // Memoize the node unless it returns a flag. 4626 SDNode *N; 4627 if (VTList.VTs[VTList.NumVTs-1] != MVT::Glue) { 4628 FoldingSetNodeID ID; 4629 AddNodeIDNode(ID, Opcode, VTList, Ops, NumOps); 4630 void *IP = 0; 4631 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 4632 return SDValue(E, 0); 4633 4634 if (NumOps == 1) { 4635 N = new (NodeAllocator) UnarySDNode(Opcode, DL, VTList, Ops[0]); 4636 } else if (NumOps == 2) { 4637 N = new (NodeAllocator) BinarySDNode(Opcode, DL, VTList, Ops[0], Ops[1]); 4638 } else if (NumOps == 3) { 4639 N = new (NodeAllocator) TernarySDNode(Opcode, DL, VTList, Ops[0], Ops[1], 4640 Ops[2]); 4641 } else { 4642 N = new (NodeAllocator) SDNode(Opcode, DL, VTList, Ops, NumOps); 4643 } 4644 CSEMap.InsertNode(N, IP); 4645 } else { 4646 if (NumOps == 1) { 4647 N = new (NodeAllocator) UnarySDNode(Opcode, DL, VTList, Ops[0]); 4648 } else if (NumOps == 2) { 4649 N = new (NodeAllocator) BinarySDNode(Opcode, DL, VTList, Ops[0], Ops[1]); 4650 } else if (NumOps == 3) { 4651 N = new (NodeAllocator) TernarySDNode(Opcode, DL, VTList, Ops[0], Ops[1], 4652 Ops[2]); 4653 } else { 4654 N = new (NodeAllocator) SDNode(Opcode, DL, VTList, Ops, NumOps); 4655 } 4656 } 4657 AllNodes.push_back(N); 4658#ifndef NDEBUG 4659 VerifySDNode(N); 4660#endif 4661 return SDValue(N, 0); 4662} 4663 4664SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList) { 4665 return getNode(Opcode, DL, VTList, 0, 0); 4666} 4667 4668SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList, 4669 SDValue N1) { 4670 SDValue Ops[] = { N1 }; 4671 return getNode(Opcode, DL, VTList, Ops, 1); 4672} 4673 4674SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList, 4675 SDValue N1, SDValue N2) { 4676 SDValue Ops[] = { N1, N2 }; 4677 return getNode(Opcode, DL, VTList, Ops, 2); 4678} 4679 4680SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList, 4681 SDValue N1, SDValue N2, SDValue N3) { 4682 SDValue Ops[] = { N1, N2, N3 }; 4683 return getNode(Opcode, DL, VTList, Ops, 3); 4684} 4685 4686SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList, 4687 SDValue N1, SDValue N2, SDValue N3, 4688 SDValue N4) { 4689 SDValue Ops[] = { N1, N2, N3, N4 }; 4690 return getNode(Opcode, DL, VTList, Ops, 4); 4691} 4692 4693SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList, 4694 SDValue N1, SDValue N2, SDValue N3, 4695 SDValue N4, SDValue N5) { 4696 SDValue Ops[] = { N1, N2, N3, N4, N5 }; 4697 return getNode(Opcode, DL, VTList, Ops, 5); 4698} 4699 4700SDVTList SelectionDAG::getVTList(EVT VT) { 4701 return makeVTList(SDNode::getValueTypeList(VT), 1); 4702} 4703 4704SDVTList SelectionDAG::getVTList(EVT VT1, EVT VT2) { 4705 for (std::vector<SDVTList>::reverse_iterator I = VTList.rbegin(), 4706 E = VTList.rend(); I != E; ++I) 4707 if (I->NumVTs == 2 && I->VTs[0] == VT1 && I->VTs[1] == VT2) 4708 return *I; 4709 4710 EVT *Array = Allocator.Allocate<EVT>(2); 4711 Array[0] = VT1; 4712 Array[1] = VT2; 4713 SDVTList Result = makeVTList(Array, 2); 4714 VTList.push_back(Result); 4715 return Result; 4716} 4717 4718SDVTList SelectionDAG::getVTList(EVT VT1, EVT VT2, EVT VT3) { 4719 for (std::vector<SDVTList>::reverse_iterator I = VTList.rbegin(), 4720 E = VTList.rend(); I != E; ++I) 4721 if (I->NumVTs == 3 && I->VTs[0] == VT1 && I->VTs[1] == VT2 && 4722 I->VTs[2] == VT3) 4723 return *I; 4724 4725 EVT *Array = Allocator.Allocate<EVT>(3); 4726 Array[0] = VT1; 4727 Array[1] = VT2; 4728 Array[2] = VT3; 4729 SDVTList Result = makeVTList(Array, 3); 4730 VTList.push_back(Result); 4731 return Result; 4732} 4733 4734SDVTList SelectionDAG::getVTList(EVT VT1, EVT VT2, EVT VT3, EVT VT4) { 4735 for (std::vector<SDVTList>::reverse_iterator I = VTList.rbegin(), 4736 E = VTList.rend(); I != E; ++I) 4737 if (I->NumVTs == 4 && I->VTs[0] == VT1 && I->VTs[1] == VT2 && 4738 I->VTs[2] == VT3 && I->VTs[3] == VT4) 4739 return *I; 4740 4741 EVT *Array = Allocator.Allocate<EVT>(4); 4742 Array[0] = VT1; 4743 Array[1] = VT2; 4744 Array[2] = VT3; 4745 Array[3] = VT4; 4746 SDVTList Result = makeVTList(Array, 4); 4747 VTList.push_back(Result); 4748 return Result; 4749} 4750 4751SDVTList SelectionDAG::getVTList(const EVT *VTs, unsigned NumVTs) { 4752 switch (NumVTs) { 4753 case 0: llvm_unreachable("Cannot have nodes without results!"); 4754 case 1: return getVTList(VTs[0]); 4755 case 2: return getVTList(VTs[0], VTs[1]); 4756 case 3: return getVTList(VTs[0], VTs[1], VTs[2]); 4757 case 4: return getVTList(VTs[0], VTs[1], VTs[2], VTs[3]); 4758 default: break; 4759 } 4760 4761 for (std::vector<SDVTList>::reverse_iterator I = VTList.rbegin(), 4762 E = VTList.rend(); I != E; ++I) { 4763 if (I->NumVTs != NumVTs || VTs[0] != I->VTs[0] || VTs[1] != I->VTs[1]) 4764 continue; 4765 4766 if (std::equal(&VTs[2], &VTs[NumVTs], &I->VTs[2])) 4767 return *I; 4768 } 4769 4770 EVT *Array = Allocator.Allocate<EVT>(NumVTs); 4771 std::copy(VTs, VTs+NumVTs, Array); 4772 SDVTList Result = makeVTList(Array, NumVTs); 4773 VTList.push_back(Result); 4774 return Result; 4775} 4776 4777 4778/// UpdateNodeOperands - *Mutate* the specified node in-place to have the 4779/// specified operands. If the resultant node already exists in the DAG, 4780/// this does not modify the specified node, instead it returns the node that 4781/// already exists. If the resultant node does not exist in the DAG, the 4782/// input node is returned. As a degenerate case, if you specify the same 4783/// input operands as the node already has, the input node is returned. 4784SDNode *SelectionDAG::UpdateNodeOperands(SDNode *N, SDValue Op) { 4785 assert(N->getNumOperands() == 1 && "Update with wrong number of operands"); 4786 4787 // Check to see if there is no change. 4788 if (Op == N->getOperand(0)) return N; 4789 4790 // See if the modified node already exists. 4791 void *InsertPos = 0; 4792 if (SDNode *Existing = FindModifiedNodeSlot(N, Op, InsertPos)) 4793 return Existing; 4794 4795 // Nope it doesn't. Remove the node from its current place in the maps. 4796 if (InsertPos) 4797 if (!RemoveNodeFromCSEMaps(N)) 4798 InsertPos = 0; 4799 4800 // Now we update the operands. 4801 N->OperandList[0].set(Op); 4802 4803 // If this gets put into a CSE map, add it. 4804 if (InsertPos) CSEMap.InsertNode(N, InsertPos); 4805 return N; 4806} 4807 4808SDNode *SelectionDAG::UpdateNodeOperands(SDNode *N, SDValue Op1, SDValue Op2) { 4809 assert(N->getNumOperands() == 2 && "Update with wrong number of operands"); 4810 4811 // Check to see if there is no change. 4812 if (Op1 == N->getOperand(0) && Op2 == N->getOperand(1)) 4813 return N; // No operands changed, just return the input node. 4814 4815 // See if the modified node already exists. 4816 void *InsertPos = 0; 4817 if (SDNode *Existing = FindModifiedNodeSlot(N, Op1, Op2, InsertPos)) 4818 return Existing; 4819 4820 // Nope it doesn't. Remove the node from its current place in the maps. 4821 if (InsertPos) 4822 if (!RemoveNodeFromCSEMaps(N)) 4823 InsertPos = 0; 4824 4825 // Now we update the operands. 4826 if (N->OperandList[0] != Op1) 4827 N->OperandList[0].set(Op1); 4828 if (N->OperandList[1] != Op2) 4829 N->OperandList[1].set(Op2); 4830 4831 // If this gets put into a CSE map, add it. 4832 if (InsertPos) CSEMap.InsertNode(N, InsertPos); 4833 return N; 4834} 4835 4836SDNode *SelectionDAG:: 4837UpdateNodeOperands(SDNode *N, SDValue Op1, SDValue Op2, SDValue Op3) { 4838 SDValue Ops[] = { Op1, Op2, Op3 }; 4839 return UpdateNodeOperands(N, Ops, 3); 4840} 4841 4842SDNode *SelectionDAG:: 4843UpdateNodeOperands(SDNode *N, SDValue Op1, SDValue Op2, 4844 SDValue Op3, SDValue Op4) { 4845 SDValue Ops[] = { Op1, Op2, Op3, Op4 }; 4846 return UpdateNodeOperands(N, Ops, 4); 4847} 4848 4849SDNode *SelectionDAG:: 4850UpdateNodeOperands(SDNode *N, SDValue Op1, SDValue Op2, 4851 SDValue Op3, SDValue Op4, SDValue Op5) { 4852 SDValue Ops[] = { Op1, Op2, Op3, Op4, Op5 }; 4853 return UpdateNodeOperands(N, Ops, 5); 4854} 4855 4856SDNode *SelectionDAG:: 4857UpdateNodeOperands(SDNode *N, const SDValue *Ops, unsigned NumOps) { 4858 assert(N->getNumOperands() == NumOps && 4859 "Update with wrong number of operands"); 4860 4861 // Check to see if there is no change. 4862 bool AnyChange = false; 4863 for (unsigned i = 0; i != NumOps; ++i) { 4864 if (Ops[i] != N->getOperand(i)) { 4865 AnyChange = true; 4866 break; 4867 } 4868 } 4869 4870 // No operands changed, just return the input node. 4871 if (!AnyChange) return N; 4872 4873 // See if the modified node already exists. 4874 void *InsertPos = 0; 4875 if (SDNode *Existing = FindModifiedNodeSlot(N, Ops, NumOps, InsertPos)) 4876 return Existing; 4877 4878 // Nope it doesn't. Remove the node from its current place in the maps. 4879 if (InsertPos) 4880 if (!RemoveNodeFromCSEMaps(N)) 4881 InsertPos = 0; 4882 4883 // Now we update the operands. 4884 for (unsigned i = 0; i != NumOps; ++i) 4885 if (N->OperandList[i] != Ops[i]) 4886 N->OperandList[i].set(Ops[i]); 4887 4888 // If this gets put into a CSE map, add it. 4889 if (InsertPos) CSEMap.InsertNode(N, InsertPos); 4890 return N; 4891} 4892 4893/// DropOperands - Release the operands and set this node to have 4894/// zero operands. 4895void SDNode::DropOperands() { 4896 // Unlike the code in MorphNodeTo that does this, we don't need to 4897 // watch for dead nodes here. 4898 for (op_iterator I = op_begin(), E = op_end(); I != E; ) { 4899 SDUse &Use = *I++; 4900 Use.set(SDValue()); 4901 } 4902} 4903 4904/// SelectNodeTo - These are wrappers around MorphNodeTo that accept a 4905/// machine opcode. 4906/// 4907SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc, 4908 EVT VT) { 4909 SDVTList VTs = getVTList(VT); 4910 return SelectNodeTo(N, MachineOpc, VTs, 0, 0); 4911} 4912 4913SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc, 4914 EVT VT, SDValue Op1) { 4915 SDVTList VTs = getVTList(VT); 4916 SDValue Ops[] = { Op1 }; 4917 return SelectNodeTo(N, MachineOpc, VTs, Ops, 1); 4918} 4919 4920SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc, 4921 EVT VT, SDValue Op1, 4922 SDValue Op2) { 4923 SDVTList VTs = getVTList(VT); 4924 SDValue Ops[] = { Op1, Op2 }; 4925 return SelectNodeTo(N, MachineOpc, VTs, Ops, 2); 4926} 4927 4928SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc, 4929 EVT VT, SDValue Op1, 4930 SDValue Op2, SDValue Op3) { 4931 SDVTList VTs = getVTList(VT); 4932 SDValue Ops[] = { Op1, Op2, Op3 }; 4933 return SelectNodeTo(N, MachineOpc, VTs, Ops, 3); 4934} 4935 4936SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc, 4937 EVT VT, const SDValue *Ops, 4938 unsigned NumOps) { 4939 SDVTList VTs = getVTList(VT); 4940 return SelectNodeTo(N, MachineOpc, VTs, Ops, NumOps); 4941} 4942 4943SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc, 4944 EVT VT1, EVT VT2, const SDValue *Ops, 4945 unsigned NumOps) { 4946 SDVTList VTs = getVTList(VT1, VT2); 4947 return SelectNodeTo(N, MachineOpc, VTs, Ops, NumOps); 4948} 4949 4950SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc, 4951 EVT VT1, EVT VT2) { 4952 SDVTList VTs = getVTList(VT1, VT2); 4953 return SelectNodeTo(N, MachineOpc, VTs, (SDValue *)0, 0); 4954} 4955 4956SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc, 4957 EVT VT1, EVT VT2, EVT VT3, 4958 const SDValue *Ops, unsigned NumOps) { 4959 SDVTList VTs = getVTList(VT1, VT2, VT3); 4960 return SelectNodeTo(N, MachineOpc, VTs, Ops, NumOps); 4961} 4962 4963SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc, 4964 EVT VT1, EVT VT2, EVT VT3, EVT VT4, 4965 const SDValue *Ops, unsigned NumOps) { 4966 SDVTList VTs = getVTList(VT1, VT2, VT3, VT4); 4967 return SelectNodeTo(N, MachineOpc, VTs, Ops, NumOps); 4968} 4969 4970SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc, 4971 EVT VT1, EVT VT2, 4972 SDValue Op1) { 4973 SDVTList VTs = getVTList(VT1, VT2); 4974 SDValue Ops[] = { Op1 }; 4975 return SelectNodeTo(N, MachineOpc, VTs, Ops, 1); 4976} 4977 4978SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc, 4979 EVT VT1, EVT VT2, 4980 SDValue Op1, SDValue Op2) { 4981 SDVTList VTs = getVTList(VT1, VT2); 4982 SDValue Ops[] = { Op1, Op2 }; 4983 return SelectNodeTo(N, MachineOpc, VTs, Ops, 2); 4984} 4985 4986SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc, 4987 EVT VT1, EVT VT2, 4988 SDValue Op1, SDValue Op2, 4989 SDValue Op3) { 4990 SDVTList VTs = getVTList(VT1, VT2); 4991 SDValue Ops[] = { Op1, Op2, Op3 }; 4992 return SelectNodeTo(N, MachineOpc, VTs, Ops, 3); 4993} 4994 4995SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc, 4996 EVT VT1, EVT VT2, EVT VT3, 4997 SDValue Op1, SDValue Op2, 4998 SDValue Op3) { 4999 SDVTList VTs = getVTList(VT1, VT2, VT3); 5000 SDValue Ops[] = { Op1, Op2, Op3 }; 5001 return SelectNodeTo(N, MachineOpc, VTs, Ops, 3); 5002} 5003 5004SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc, 5005 SDVTList VTs, const SDValue *Ops, 5006 unsigned NumOps) { 5007 N = MorphNodeTo(N, ~MachineOpc, VTs, Ops, NumOps); 5008 // Reset the NodeID to -1. 5009 N->setNodeId(-1); 5010 return N; 5011} 5012 5013/// UpdadeDebugLocOnMergedSDNode - If the opt level is -O0 then it throws away 5014/// the line number information on the merged node since it is not possible to 5015/// preserve the information that operation is associated with multiple lines. 5016/// This will make the debugger working better at -O0, were there is a higher 5017/// probability having other instructions associated with that line. 5018/// 5019SDNode *SelectionDAG::UpdadeDebugLocOnMergedSDNode(SDNode *N, DebugLoc OLoc) { 5020 DebugLoc NLoc = N->getDebugLoc(); 5021 if (!(NLoc.isUnknown()) && (OptLevel == CodeGenOpt::None) && (OLoc != NLoc)) { 5022 N->setDebugLoc(DebugLoc()); 5023 } 5024 return N; 5025} 5026 5027/// MorphNodeTo - This *mutates* the specified node to have the specified 5028/// return type, opcode, and operands. 5029/// 5030/// Note that MorphNodeTo returns the resultant node. If there is already a 5031/// node of the specified opcode and operands, it returns that node instead of 5032/// the current one. Note that the DebugLoc need not be the same. 5033/// 5034/// Using MorphNodeTo is faster than creating a new node and swapping it in 5035/// with ReplaceAllUsesWith both because it often avoids allocating a new 5036/// node, and because it doesn't require CSE recalculation for any of 5037/// the node's users. 5038/// 5039SDNode *SelectionDAG::MorphNodeTo(SDNode *N, unsigned Opc, 5040 SDVTList VTs, const SDValue *Ops, 5041 unsigned NumOps) { 5042 // If an identical node already exists, use it. 5043 void *IP = 0; 5044 if (VTs.VTs[VTs.NumVTs-1] != MVT::Glue) { 5045 FoldingSetNodeID ID; 5046 AddNodeIDNode(ID, Opc, VTs, Ops, NumOps); 5047 if (SDNode *ON = CSEMap.FindNodeOrInsertPos(ID, IP)) 5048 return UpdadeDebugLocOnMergedSDNode(ON, N->getDebugLoc()); 5049 } 5050 5051 if (!RemoveNodeFromCSEMaps(N)) 5052 IP = 0; 5053 5054 // Start the morphing. 5055 N->NodeType = Opc; 5056 N->ValueList = VTs.VTs; 5057 N->NumValues = VTs.NumVTs; 5058 5059 // Clear the operands list, updating used nodes to remove this from their 5060 // use list. Keep track of any operands that become dead as a result. 5061 SmallPtrSet<SDNode*, 16> DeadNodeSet; 5062 for (SDNode::op_iterator I = N->op_begin(), E = N->op_end(); I != E; ) { 5063 SDUse &Use = *I++; 5064 SDNode *Used = Use.getNode(); 5065 Use.set(SDValue()); 5066 if (Used->use_empty()) 5067 DeadNodeSet.insert(Used); 5068 } 5069 5070 if (MachineSDNode *MN = dyn_cast<MachineSDNode>(N)) { 5071 // Initialize the memory references information. 5072 MN->setMemRefs(0, 0); 5073 // If NumOps is larger than the # of operands we can have in a 5074 // MachineSDNode, reallocate the operand list. 5075 if (NumOps > MN->NumOperands || !MN->OperandsNeedDelete) { 5076 if (MN->OperandsNeedDelete) 5077 delete[] MN->OperandList; 5078 if (NumOps > array_lengthof(MN->LocalOperands)) 5079 // We're creating a final node that will live unmorphed for the 5080 // remainder of the current SelectionDAG iteration, so we can allocate 5081 // the operands directly out of a pool with no recycling metadata. 5082 MN->InitOperands(OperandAllocator.Allocate<SDUse>(NumOps), 5083 Ops, NumOps); 5084 else 5085 MN->InitOperands(MN->LocalOperands, Ops, NumOps); 5086 MN->OperandsNeedDelete = false; 5087 } else 5088 MN->InitOperands(MN->OperandList, Ops, NumOps); 5089 } else { 5090 // If NumOps is larger than the # of operands we currently have, reallocate 5091 // the operand list. 5092 if (NumOps > N->NumOperands) { 5093 if (N->OperandsNeedDelete) 5094 delete[] N->OperandList; 5095 N->InitOperands(new SDUse[NumOps], Ops, NumOps); 5096 N->OperandsNeedDelete = true; 5097 } else 5098 N->InitOperands(N->OperandList, Ops, NumOps); 5099 } 5100 5101 // Delete any nodes that are still dead after adding the uses for the 5102 // new operands. 5103 if (!DeadNodeSet.empty()) { 5104 SmallVector<SDNode *, 16> DeadNodes; 5105 for (SmallPtrSet<SDNode *, 16>::iterator I = DeadNodeSet.begin(), 5106 E = DeadNodeSet.end(); I != E; ++I) 5107 if ((*I)->use_empty()) 5108 DeadNodes.push_back(*I); 5109 RemoveDeadNodes(DeadNodes); 5110 } 5111 5112 if (IP) 5113 CSEMap.InsertNode(N, IP); // Memoize the new node. 5114 return N; 5115} 5116 5117 5118/// getMachineNode - These are used for target selectors to create a new node 5119/// with specified return type(s), MachineInstr opcode, and operands. 5120/// 5121/// Note that getMachineNode returns the resultant node. If there is already a 5122/// node of the specified opcode and operands, it returns that node instead of 5123/// the current one. 5124MachineSDNode * 5125SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT) { 5126 SDVTList VTs = getVTList(VT); 5127 return getMachineNode(Opcode, dl, VTs, 0, 0); 5128} 5129 5130MachineSDNode * 5131SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT, SDValue Op1) { 5132 SDVTList VTs = getVTList(VT); 5133 SDValue Ops[] = { Op1 }; 5134 return getMachineNode(Opcode, dl, VTs, Ops, array_lengthof(Ops)); 5135} 5136 5137MachineSDNode * 5138SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT, 5139 SDValue Op1, SDValue Op2) { 5140 SDVTList VTs = getVTList(VT); 5141 SDValue Ops[] = { Op1, Op2 }; 5142 return getMachineNode(Opcode, dl, VTs, Ops, array_lengthof(Ops)); 5143} 5144 5145MachineSDNode * 5146SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT, 5147 SDValue Op1, SDValue Op2, SDValue Op3) { 5148 SDVTList VTs = getVTList(VT); 5149 SDValue Ops[] = { Op1, Op2, Op3 }; 5150 return getMachineNode(Opcode, dl, VTs, Ops, array_lengthof(Ops)); 5151} 5152 5153MachineSDNode * 5154SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT, 5155 const SDValue *Ops, unsigned NumOps) { 5156 SDVTList VTs = getVTList(VT); 5157 return getMachineNode(Opcode, dl, VTs, Ops, NumOps); 5158} 5159 5160MachineSDNode * 5161SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT1, EVT VT2) { 5162 SDVTList VTs = getVTList(VT1, VT2); 5163 return getMachineNode(Opcode, dl, VTs, 0, 0); 5164} 5165 5166MachineSDNode * 5167SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, 5168 EVT VT1, EVT VT2, SDValue Op1) { 5169 SDVTList VTs = getVTList(VT1, VT2); 5170 SDValue Ops[] = { Op1 }; 5171 return getMachineNode(Opcode, dl, VTs, Ops, array_lengthof(Ops)); 5172} 5173 5174MachineSDNode * 5175SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, 5176 EVT VT1, EVT VT2, SDValue Op1, SDValue Op2) { 5177 SDVTList VTs = getVTList(VT1, VT2); 5178 SDValue Ops[] = { Op1, Op2 }; 5179 return getMachineNode(Opcode, dl, VTs, Ops, array_lengthof(Ops)); 5180} 5181 5182MachineSDNode * 5183SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, 5184 EVT VT1, EVT VT2, SDValue Op1, 5185 SDValue Op2, SDValue Op3) { 5186 SDVTList VTs = getVTList(VT1, VT2); 5187 SDValue Ops[] = { Op1, Op2, Op3 }; 5188 return getMachineNode(Opcode, dl, VTs, Ops, array_lengthof(Ops)); 5189} 5190 5191MachineSDNode * 5192SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, 5193 EVT VT1, EVT VT2, 5194 const SDValue *Ops, unsigned NumOps) { 5195 SDVTList VTs = getVTList(VT1, VT2); 5196 return getMachineNode(Opcode, dl, VTs, Ops, NumOps); 5197} 5198 5199MachineSDNode * 5200SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, 5201 EVT VT1, EVT VT2, EVT VT3, 5202 SDValue Op1, SDValue Op2) { 5203 SDVTList VTs = getVTList(VT1, VT2, VT3); 5204 SDValue Ops[] = { Op1, Op2 }; 5205 return getMachineNode(Opcode, dl, VTs, Ops, array_lengthof(Ops)); 5206} 5207 5208MachineSDNode * 5209SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, 5210 EVT VT1, EVT VT2, EVT VT3, 5211 SDValue Op1, SDValue Op2, SDValue Op3) { 5212 SDVTList VTs = getVTList(VT1, VT2, VT3); 5213 SDValue Ops[] = { Op1, Op2, Op3 }; 5214 return getMachineNode(Opcode, dl, VTs, Ops, array_lengthof(Ops)); 5215} 5216 5217MachineSDNode * 5218SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, 5219 EVT VT1, EVT VT2, EVT VT3, 5220 const SDValue *Ops, unsigned NumOps) { 5221 SDVTList VTs = getVTList(VT1, VT2, VT3); 5222 return getMachineNode(Opcode, dl, VTs, Ops, NumOps); 5223} 5224 5225MachineSDNode * 5226SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT1, 5227 EVT VT2, EVT VT3, EVT VT4, 5228 const SDValue *Ops, unsigned NumOps) { 5229 SDVTList VTs = getVTList(VT1, VT2, VT3, VT4); 5230 return getMachineNode(Opcode, dl, VTs, Ops, NumOps); 5231} 5232 5233MachineSDNode * 5234SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, 5235 const std::vector<EVT> &ResultTys, 5236 const SDValue *Ops, unsigned NumOps) { 5237 SDVTList VTs = getVTList(&ResultTys[0], ResultTys.size()); 5238 return getMachineNode(Opcode, dl, VTs, Ops, NumOps); 5239} 5240 5241MachineSDNode * 5242SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc DL, SDVTList VTs, 5243 const SDValue *Ops, unsigned NumOps) { 5244 bool DoCSE = VTs.VTs[VTs.NumVTs-1] != MVT::Glue; 5245 MachineSDNode *N; 5246 void *IP = 0; 5247 5248 if (DoCSE) { 5249 FoldingSetNodeID ID; 5250 AddNodeIDNode(ID, ~Opcode, VTs, Ops, NumOps); 5251 IP = 0; 5252 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) { 5253 return cast<MachineSDNode>(UpdadeDebugLocOnMergedSDNode(E, DL)); 5254 } 5255 } 5256 5257 // Allocate a new MachineSDNode. 5258 N = new (NodeAllocator) MachineSDNode(~Opcode, DL, VTs); 5259 5260 // Initialize the operands list. 5261 if (NumOps > array_lengthof(N->LocalOperands)) 5262 // We're creating a final node that will live unmorphed for the 5263 // remainder of the current SelectionDAG iteration, so we can allocate 5264 // the operands directly out of a pool with no recycling metadata. 5265 N->InitOperands(OperandAllocator.Allocate<SDUse>(NumOps), 5266 Ops, NumOps); 5267 else 5268 N->InitOperands(N->LocalOperands, Ops, NumOps); 5269 N->OperandsNeedDelete = false; 5270 5271 if (DoCSE) 5272 CSEMap.InsertNode(N, IP); 5273 5274 AllNodes.push_back(N); 5275#ifndef NDEBUG 5276 VerifyMachineNode(N); 5277#endif 5278 return N; 5279} 5280 5281/// getTargetExtractSubreg - A convenience function for creating 5282/// TargetOpcode::EXTRACT_SUBREG nodes. 5283SDValue 5284SelectionDAG::getTargetExtractSubreg(int SRIdx, DebugLoc DL, EVT VT, 5285 SDValue Operand) { 5286 SDValue SRIdxVal = getTargetConstant(SRIdx, MVT::i32); 5287 SDNode *Subreg = getMachineNode(TargetOpcode::EXTRACT_SUBREG, DL, 5288 VT, Operand, SRIdxVal); 5289 return SDValue(Subreg, 0); 5290} 5291 5292/// getTargetInsertSubreg - A convenience function for creating 5293/// TargetOpcode::INSERT_SUBREG nodes. 5294SDValue 5295SelectionDAG::getTargetInsertSubreg(int SRIdx, DebugLoc DL, EVT VT, 5296 SDValue Operand, SDValue Subreg) { 5297 SDValue SRIdxVal = getTargetConstant(SRIdx, MVT::i32); 5298 SDNode *Result = getMachineNode(TargetOpcode::INSERT_SUBREG, DL, 5299 VT, Operand, Subreg, SRIdxVal); 5300 return SDValue(Result, 0); 5301} 5302 5303/// getNodeIfExists - Get the specified node if it's already available, or 5304/// else return NULL. 5305SDNode *SelectionDAG::getNodeIfExists(unsigned Opcode, SDVTList VTList, 5306 const SDValue *Ops, unsigned NumOps) { 5307 if (VTList.VTs[VTList.NumVTs-1] != MVT::Glue) { 5308 FoldingSetNodeID ID; 5309 AddNodeIDNode(ID, Opcode, VTList, Ops, NumOps); 5310 void *IP = 0; 5311 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) 5312 return E; 5313 } 5314 return NULL; 5315} 5316 5317/// getDbgValue - Creates a SDDbgValue node. 5318/// 5319SDDbgValue * 5320SelectionDAG::getDbgValue(MDNode *MDPtr, SDNode *N, unsigned R, uint64_t Off, 5321 DebugLoc DL, unsigned O) { 5322 return new (Allocator) SDDbgValue(MDPtr, N, R, Off, DL, O); 5323} 5324 5325SDDbgValue * 5326SelectionDAG::getDbgValue(MDNode *MDPtr, const Value *C, uint64_t Off, 5327 DebugLoc DL, unsigned O) { 5328 return new (Allocator) SDDbgValue(MDPtr, C, Off, DL, O); 5329} 5330 5331SDDbgValue * 5332SelectionDAG::getDbgValue(MDNode *MDPtr, unsigned FI, uint64_t Off, 5333 DebugLoc DL, unsigned O) { 5334 return new (Allocator) SDDbgValue(MDPtr, FI, Off, DL, O); 5335} 5336 5337namespace { 5338 5339/// RAUWUpdateListener - Helper for ReplaceAllUsesWith - When the node 5340/// pointed to by a use iterator is deleted, increment the use iterator 5341/// so that it doesn't dangle. 5342/// 5343class RAUWUpdateListener : public SelectionDAG::DAGUpdateListener { 5344 SDNode::use_iterator &UI; 5345 SDNode::use_iterator &UE; 5346 5347 virtual void NodeDeleted(SDNode *N, SDNode *E) { 5348 // Increment the iterator as needed. 5349 while (UI != UE && N == *UI) 5350 ++UI; 5351 } 5352 5353public: 5354 RAUWUpdateListener(SelectionDAG &d, 5355 SDNode::use_iterator &ui, 5356 SDNode::use_iterator &ue) 5357 : SelectionDAG::DAGUpdateListener(d), UI(ui), UE(ue) {} 5358}; 5359 5360} 5361 5362/// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead. 5363/// This can cause recursive merging of nodes in the DAG. 5364/// 5365/// This version assumes From has a single result value. 5366/// 5367void SelectionDAG::ReplaceAllUsesWith(SDValue FromN, SDValue To) { 5368 SDNode *From = FromN.getNode(); 5369 assert(From->getNumValues() == 1 && FromN.getResNo() == 0 && 5370 "Cannot replace with this method!"); 5371 assert(From != To.getNode() && "Cannot replace uses of with self"); 5372 5373 // Iterate over all the existing uses of From. New uses will be added 5374 // to the beginning of the use list, which we avoid visiting. 5375 // This specifically avoids visiting uses of From that arise while the 5376 // replacement is happening, because any such uses would be the result 5377 // of CSE: If an existing node looks like From after one of its operands 5378 // is replaced by To, we don't want to replace of all its users with To 5379 // too. See PR3018 for more info. 5380 SDNode::use_iterator UI = From->use_begin(), UE = From->use_end(); 5381 RAUWUpdateListener Listener(*this, UI, UE); 5382 while (UI != UE) { 5383 SDNode *User = *UI; 5384 5385 // This node is about to morph, remove its old self from the CSE maps. 5386 RemoveNodeFromCSEMaps(User); 5387 5388 // A user can appear in a use list multiple times, and when this 5389 // happens the uses are usually next to each other in the list. 5390 // To help reduce the number of CSE recomputations, process all 5391 // the uses of this user that we can find this way. 5392 do { 5393 SDUse &Use = UI.getUse(); 5394 ++UI; 5395 Use.set(To); 5396 } while (UI != UE && *UI == User); 5397 5398 // Now that we have modified User, add it back to the CSE maps. If it 5399 // already exists there, recursively merge the results together. 5400 AddModifiedNodeToCSEMaps(User); 5401 } 5402 5403 // If we just RAUW'd the root, take note. 5404 if (FromN == getRoot()) 5405 setRoot(To); 5406} 5407 5408/// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead. 5409/// This can cause recursive merging of nodes in the DAG. 5410/// 5411/// This version assumes that for each value of From, there is a 5412/// corresponding value in To in the same position with the same type. 5413/// 5414void SelectionDAG::ReplaceAllUsesWith(SDNode *From, SDNode *To) { 5415#ifndef NDEBUG 5416 for (unsigned i = 0, e = From->getNumValues(); i != e; ++i) 5417 assert((!From->hasAnyUseOfValue(i) || 5418 From->getValueType(i) == To->getValueType(i)) && 5419 "Cannot use this version of ReplaceAllUsesWith!"); 5420#endif 5421 5422 // Handle the trivial case. 5423 if (From == To) 5424 return; 5425 5426 // Iterate over just the existing users of From. See the comments in 5427 // the ReplaceAllUsesWith above. 5428 SDNode::use_iterator UI = From->use_begin(), UE = From->use_end(); 5429 RAUWUpdateListener Listener(*this, UI, UE); 5430 while (UI != UE) { 5431 SDNode *User = *UI; 5432 5433 // This node is about to morph, remove its old self from the CSE maps. 5434 RemoveNodeFromCSEMaps(User); 5435 5436 // A user can appear in a use list multiple times, and when this 5437 // happens the uses are usually next to each other in the list. 5438 // To help reduce the number of CSE recomputations, process all 5439 // the uses of this user that we can find this way. 5440 do { 5441 SDUse &Use = UI.getUse(); 5442 ++UI; 5443 Use.setNode(To); 5444 } while (UI != UE && *UI == User); 5445 5446 // Now that we have modified User, add it back to the CSE maps. If it 5447 // already exists there, recursively merge the results together. 5448 AddModifiedNodeToCSEMaps(User); 5449 } 5450 5451 // If we just RAUW'd the root, take note. 5452 if (From == getRoot().getNode()) 5453 setRoot(SDValue(To, getRoot().getResNo())); 5454} 5455 5456/// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead. 5457/// This can cause recursive merging of nodes in the DAG. 5458/// 5459/// This version can replace From with any result values. To must match the 5460/// number and types of values returned by From. 5461void SelectionDAG::ReplaceAllUsesWith(SDNode *From, const SDValue *To) { 5462 if (From->getNumValues() == 1) // Handle the simple case efficiently. 5463 return ReplaceAllUsesWith(SDValue(From, 0), To[0]); 5464 5465 // Iterate over just the existing users of From. See the comments in 5466 // the ReplaceAllUsesWith above. 5467 SDNode::use_iterator UI = From->use_begin(), UE = From->use_end(); 5468 RAUWUpdateListener Listener(*this, UI, UE); 5469 while (UI != UE) { 5470 SDNode *User = *UI; 5471 5472 // This node is about to morph, remove its old self from the CSE maps. 5473 RemoveNodeFromCSEMaps(User); 5474 5475 // A user can appear in a use list multiple times, and when this 5476 // happens the uses are usually next to each other in the list. 5477 // To help reduce the number of CSE recomputations, process all 5478 // the uses of this user that we can find this way. 5479 do { 5480 SDUse &Use = UI.getUse(); 5481 const SDValue &ToOp = To[Use.getResNo()]; 5482 ++UI; 5483 Use.set(ToOp); 5484 } while (UI != UE && *UI == User); 5485 5486 // Now that we have modified User, add it back to the CSE maps. If it 5487 // already exists there, recursively merge the results together. 5488 AddModifiedNodeToCSEMaps(User); 5489 } 5490 5491 // If we just RAUW'd the root, take note. 5492 if (From == getRoot().getNode()) 5493 setRoot(SDValue(To[getRoot().getResNo()])); 5494} 5495 5496/// ReplaceAllUsesOfValueWith - Replace any uses of From with To, leaving 5497/// uses of other values produced by From.getNode() alone. The Deleted 5498/// vector is handled the same way as for ReplaceAllUsesWith. 5499void SelectionDAG::ReplaceAllUsesOfValueWith(SDValue From, SDValue To){ 5500 // Handle the really simple, really trivial case efficiently. 5501 if (From == To) return; 5502 5503 // Handle the simple, trivial, case efficiently. 5504 if (From.getNode()->getNumValues() == 1) { 5505 ReplaceAllUsesWith(From, To); 5506 return; 5507 } 5508 5509 // Iterate over just the existing users of From. See the comments in 5510 // the ReplaceAllUsesWith above. 5511 SDNode::use_iterator UI = From.getNode()->use_begin(), 5512 UE = From.getNode()->use_end(); 5513 RAUWUpdateListener Listener(*this, UI, UE); 5514 while (UI != UE) { 5515 SDNode *User = *UI; 5516 bool UserRemovedFromCSEMaps = false; 5517 5518 // A user can appear in a use list multiple times, and when this 5519 // happens the uses are usually next to each other in the list. 5520 // To help reduce the number of CSE recomputations, process all 5521 // the uses of this user that we can find this way. 5522 do { 5523 SDUse &Use = UI.getUse(); 5524 5525 // Skip uses of different values from the same node. 5526 if (Use.getResNo() != From.getResNo()) { 5527 ++UI; 5528 continue; 5529 } 5530 5531 // If this node hasn't been modified yet, it's still in the CSE maps, 5532 // so remove its old self from the CSE maps. 5533 if (!UserRemovedFromCSEMaps) { 5534 RemoveNodeFromCSEMaps(User); 5535 UserRemovedFromCSEMaps = true; 5536 } 5537 5538 ++UI; 5539 Use.set(To); 5540 } while (UI != UE && *UI == User); 5541 5542 // We are iterating over all uses of the From node, so if a use 5543 // doesn't use the specific value, no changes are made. 5544 if (!UserRemovedFromCSEMaps) 5545 continue; 5546 5547 // Now that we have modified User, add it back to the CSE maps. If it 5548 // already exists there, recursively merge the results together. 5549 AddModifiedNodeToCSEMaps(User); 5550 } 5551 5552 // If we just RAUW'd the root, take note. 5553 if (From == getRoot()) 5554 setRoot(To); 5555} 5556 5557namespace { 5558 /// UseMemo - This class is used by SelectionDAG::ReplaceAllUsesOfValuesWith 5559 /// to record information about a use. 5560 struct UseMemo { 5561 SDNode *User; 5562 unsigned Index; 5563 SDUse *Use; 5564 }; 5565 5566 /// operator< - Sort Memos by User. 5567 bool operator<(const UseMemo &L, const UseMemo &R) { 5568 return (intptr_t)L.User < (intptr_t)R.User; 5569 } 5570} 5571 5572/// ReplaceAllUsesOfValuesWith - Replace any uses of From with To, leaving 5573/// uses of other values produced by From.getNode() alone. The same value 5574/// may appear in both the From and To list. The Deleted vector is 5575/// handled the same way as for ReplaceAllUsesWith. 5576void SelectionDAG::ReplaceAllUsesOfValuesWith(const SDValue *From, 5577 const SDValue *To, 5578 unsigned Num){ 5579 // Handle the simple, trivial case efficiently. 5580 if (Num == 1) 5581 return ReplaceAllUsesOfValueWith(*From, *To); 5582 5583 // Read up all the uses and make records of them. This helps 5584 // processing new uses that are introduced during the 5585 // replacement process. 5586 SmallVector<UseMemo, 4> Uses; 5587 for (unsigned i = 0; i != Num; ++i) { 5588 unsigned FromResNo = From[i].getResNo(); 5589 SDNode *FromNode = From[i].getNode(); 5590 for (SDNode::use_iterator UI = FromNode->use_begin(), 5591 E = FromNode->use_end(); UI != E; ++UI) { 5592 SDUse &Use = UI.getUse(); 5593 if (Use.getResNo() == FromResNo) { 5594 UseMemo Memo = { *UI, i, &Use }; 5595 Uses.push_back(Memo); 5596 } 5597 } 5598 } 5599 5600 // Sort the uses, so that all the uses from a given User are together. 5601 std::sort(Uses.begin(), Uses.end()); 5602 5603 for (unsigned UseIndex = 0, UseIndexEnd = Uses.size(); 5604 UseIndex != UseIndexEnd; ) { 5605 // We know that this user uses some value of From. If it is the right 5606 // value, update it. 5607 SDNode *User = Uses[UseIndex].User; 5608 5609 // This node is about to morph, remove its old self from the CSE maps. 5610 RemoveNodeFromCSEMaps(User); 5611 5612 // The Uses array is sorted, so all the uses for a given User 5613 // are next to each other in the list. 5614 // To help reduce the number of CSE recomputations, process all 5615 // the uses of this user that we can find this way. 5616 do { 5617 unsigned i = Uses[UseIndex].Index; 5618 SDUse &Use = *Uses[UseIndex].Use; 5619 ++UseIndex; 5620 5621 Use.set(To[i]); 5622 } while (UseIndex != UseIndexEnd && Uses[UseIndex].User == User); 5623 5624 // Now that we have modified User, add it back to the CSE maps. If it 5625 // already exists there, recursively merge the results together. 5626 AddModifiedNodeToCSEMaps(User); 5627 } 5628} 5629 5630/// AssignTopologicalOrder - Assign a unique node id for each node in the DAG 5631/// based on their topological order. It returns the maximum id and a vector 5632/// of the SDNodes* in assigned order by reference. 5633unsigned SelectionDAG::AssignTopologicalOrder() { 5634 5635 unsigned DAGSize = 0; 5636 5637 // SortedPos tracks the progress of the algorithm. Nodes before it are 5638 // sorted, nodes after it are unsorted. When the algorithm completes 5639 // it is at the end of the list. 5640 allnodes_iterator SortedPos = allnodes_begin(); 5641 5642 // Visit all the nodes. Move nodes with no operands to the front of 5643 // the list immediately. Annotate nodes that do have operands with their 5644 // operand count. Before we do this, the Node Id fields of the nodes 5645 // may contain arbitrary values. After, the Node Id fields for nodes 5646 // before SortedPos will contain the topological sort index, and the 5647 // Node Id fields for nodes At SortedPos and after will contain the 5648 // count of outstanding operands. 5649 for (allnodes_iterator I = allnodes_begin(),E = allnodes_end(); I != E; ) { 5650 SDNode *N = I++; 5651 checkForCycles(N); 5652 unsigned Degree = N->getNumOperands(); 5653 if (Degree == 0) { 5654 // A node with no uses, add it to the result array immediately. 5655 N->setNodeId(DAGSize++); 5656 allnodes_iterator Q = N; 5657 if (Q != SortedPos) 5658 SortedPos = AllNodes.insert(SortedPos, AllNodes.remove(Q)); 5659 assert(SortedPos != AllNodes.end() && "Overran node list"); 5660 ++SortedPos; 5661 } else { 5662 // Temporarily use the Node Id as scratch space for the degree count. 5663 N->setNodeId(Degree); 5664 } 5665 } 5666 5667 // Visit all the nodes. As we iterate, move nodes into sorted order, 5668 // such that by the time the end is reached all nodes will be sorted. 5669 for (allnodes_iterator I = allnodes_begin(),E = allnodes_end(); I != E; ++I) { 5670 SDNode *N = I; 5671 checkForCycles(N); 5672 // N is in sorted position, so all its uses have one less operand 5673 // that needs to be sorted. 5674 for (SDNode::use_iterator UI = N->use_begin(), UE = N->use_end(); 5675 UI != UE; ++UI) { 5676 SDNode *P = *UI; 5677 unsigned Degree = P->getNodeId(); 5678 assert(Degree != 0 && "Invalid node degree"); 5679 --Degree; 5680 if (Degree == 0) { 5681 // All of P's operands are sorted, so P may sorted now. 5682 P->setNodeId(DAGSize++); 5683 if (P != SortedPos) 5684 SortedPos = AllNodes.insert(SortedPos, AllNodes.remove(P)); 5685 assert(SortedPos != AllNodes.end() && "Overran node list"); 5686 ++SortedPos; 5687 } else { 5688 // Update P's outstanding operand count. 5689 P->setNodeId(Degree); 5690 } 5691 } 5692 if (I == SortedPos) { 5693#ifndef NDEBUG 5694 SDNode *S = ++I; 5695 dbgs() << "Overran sorted position:\n"; 5696 S->dumprFull(); 5697#endif 5698 llvm_unreachable(0); 5699 } 5700 } 5701 5702 assert(SortedPos == AllNodes.end() && 5703 "Topological sort incomplete!"); 5704 assert(AllNodes.front().getOpcode() == ISD::EntryToken && 5705 "First node in topological sort is not the entry token!"); 5706 assert(AllNodes.front().getNodeId() == 0 && 5707 "First node in topological sort has non-zero id!"); 5708 assert(AllNodes.front().getNumOperands() == 0 && 5709 "First node in topological sort has operands!"); 5710 assert(AllNodes.back().getNodeId() == (int)DAGSize-1 && 5711 "Last node in topologic sort has unexpected id!"); 5712 assert(AllNodes.back().use_empty() && 5713 "Last node in topologic sort has users!"); 5714 assert(DAGSize == allnodes_size() && "Node count mismatch!"); 5715 return DAGSize; 5716} 5717 5718/// AssignOrdering - Assign an order to the SDNode. 5719void SelectionDAG::AssignOrdering(const SDNode *SD, unsigned Order) { 5720 assert(SD && "Trying to assign an order to a null node!"); 5721 Ordering->add(SD, Order); 5722} 5723 5724/// GetOrdering - Get the order for the SDNode. 5725unsigned SelectionDAG::GetOrdering(const SDNode *SD) const { 5726 assert(SD && "Trying to get the order of a null node!"); 5727 return Ordering->getOrder(SD); 5728} 5729 5730/// AddDbgValue - Add a dbg_value SDNode. If SD is non-null that means the 5731/// value is produced by SD. 5732void SelectionDAG::AddDbgValue(SDDbgValue *DB, SDNode *SD, bool isParameter) { 5733 DbgInfo->add(DB, SD, isParameter); 5734 if (SD) 5735 SD->setHasDebugValue(true); 5736} 5737 5738/// TransferDbgValues - Transfer SDDbgValues. 5739void SelectionDAG::TransferDbgValues(SDValue From, SDValue To) { 5740 if (From == To || !From.getNode()->getHasDebugValue()) 5741 return; 5742 SDNode *FromNode = From.getNode(); 5743 SDNode *ToNode = To.getNode(); 5744 ArrayRef<SDDbgValue *> DVs = GetDbgValues(FromNode); 5745 SmallVector<SDDbgValue *, 2> ClonedDVs; 5746 for (ArrayRef<SDDbgValue *>::iterator I = DVs.begin(), E = DVs.end(); 5747 I != E; ++I) { 5748 SDDbgValue *Dbg = *I; 5749 if (Dbg->getKind() == SDDbgValue::SDNODE) { 5750 SDDbgValue *Clone = getDbgValue(Dbg->getMDPtr(), ToNode, To.getResNo(), 5751 Dbg->getOffset(), Dbg->getDebugLoc(), 5752 Dbg->getOrder()); 5753 ClonedDVs.push_back(Clone); 5754 } 5755 } 5756 for (SmallVector<SDDbgValue *, 2>::iterator I = ClonedDVs.begin(), 5757 E = ClonedDVs.end(); I != E; ++I) 5758 AddDbgValue(*I, ToNode, false); 5759} 5760 5761//===----------------------------------------------------------------------===// 5762// SDNode Class 5763//===----------------------------------------------------------------------===// 5764 5765HandleSDNode::~HandleSDNode() { 5766 DropOperands(); 5767} 5768 5769GlobalAddressSDNode::GlobalAddressSDNode(unsigned Opc, DebugLoc DL, 5770 const GlobalValue *GA, 5771 EVT VT, int64_t o, unsigned char TF) 5772 : SDNode(Opc, DL, getSDVTList(VT)), Offset(o), TargetFlags(TF) { 5773 TheGlobal = GA; 5774} 5775 5776MemSDNode::MemSDNode(unsigned Opc, DebugLoc dl, SDVTList VTs, EVT memvt, 5777 MachineMemOperand *mmo) 5778 : SDNode(Opc, dl, VTs), MemoryVT(memvt), MMO(mmo) { 5779 SubclassData = encodeMemSDNodeFlags(0, ISD::UNINDEXED, MMO->isVolatile(), 5780 MMO->isNonTemporal(), MMO->isInvariant()); 5781 assert(isVolatile() == MMO->isVolatile() && "Volatile encoding error!"); 5782 assert(isNonTemporal() == MMO->isNonTemporal() && 5783 "Non-temporal encoding error!"); 5784 assert(memvt.getStoreSize() == MMO->getSize() && "Size mismatch!"); 5785} 5786 5787MemSDNode::MemSDNode(unsigned Opc, DebugLoc dl, SDVTList VTs, 5788 const SDValue *Ops, unsigned NumOps, EVT memvt, 5789 MachineMemOperand *mmo) 5790 : SDNode(Opc, dl, VTs, Ops, NumOps), 5791 MemoryVT(memvt), MMO(mmo) { 5792 SubclassData = encodeMemSDNodeFlags(0, ISD::UNINDEXED, MMO->isVolatile(), 5793 MMO->isNonTemporal(), MMO->isInvariant()); 5794 assert(isVolatile() == MMO->isVolatile() && "Volatile encoding error!"); 5795 assert(memvt.getStoreSize() == MMO->getSize() && "Size mismatch!"); 5796} 5797 5798/// Profile - Gather unique data for the node. 5799/// 5800void SDNode::Profile(FoldingSetNodeID &ID) const { 5801 AddNodeIDNode(ID, this); 5802} 5803 5804namespace { 5805 struct EVTArray { 5806 std::vector<EVT> VTs; 5807 5808 EVTArray() { 5809 VTs.reserve(MVT::LAST_VALUETYPE); 5810 for (unsigned i = 0; i < MVT::LAST_VALUETYPE; ++i) 5811 VTs.push_back(MVT((MVT::SimpleValueType)i)); 5812 } 5813 }; 5814} 5815 5816static ManagedStatic<std::set<EVT, EVT::compareRawBits> > EVTs; 5817static ManagedStatic<EVTArray> SimpleVTArray; 5818static ManagedStatic<sys::SmartMutex<true> > VTMutex; 5819 5820/// getValueTypeList - Return a pointer to the specified value type. 5821/// 5822const EVT *SDNode::getValueTypeList(EVT VT) { 5823 if (VT.isExtended()) { 5824 sys::SmartScopedLock<true> Lock(*VTMutex); 5825 return &(*EVTs->insert(VT).first); 5826 } else { 5827 assert(VT.getSimpleVT() < MVT::LAST_VALUETYPE && 5828 "Value type out of range!"); 5829 return &SimpleVTArray->VTs[VT.getSimpleVT().SimpleTy]; 5830 } 5831} 5832 5833/// hasNUsesOfValue - Return true if there are exactly NUSES uses of the 5834/// indicated value. This method ignores uses of other values defined by this 5835/// operation. 5836bool SDNode::hasNUsesOfValue(unsigned NUses, unsigned Value) const { 5837 assert(Value < getNumValues() && "Bad value!"); 5838 5839 // TODO: Only iterate over uses of a given value of the node 5840 for (SDNode::use_iterator UI = use_begin(), E = use_end(); UI != E; ++UI) { 5841 if (UI.getUse().getResNo() == Value) { 5842 if (NUses == 0) 5843 return false; 5844 --NUses; 5845 } 5846 } 5847 5848 // Found exactly the right number of uses? 5849 return NUses == 0; 5850} 5851 5852 5853/// hasAnyUseOfValue - Return true if there are any use of the indicated 5854/// value. This method ignores uses of other values defined by this operation. 5855bool SDNode::hasAnyUseOfValue(unsigned Value) const { 5856 assert(Value < getNumValues() && "Bad value!"); 5857 5858 for (SDNode::use_iterator UI = use_begin(), E = use_end(); UI != E; ++UI) 5859 if (UI.getUse().getResNo() == Value) 5860 return true; 5861 5862 return false; 5863} 5864 5865 5866/// isOnlyUserOf - Return true if this node is the only use of N. 5867/// 5868bool SDNode::isOnlyUserOf(SDNode *N) const { 5869 bool Seen = false; 5870 for (SDNode::use_iterator I = N->use_begin(), E = N->use_end(); I != E; ++I) { 5871 SDNode *User = *I; 5872 if (User == this) 5873 Seen = true; 5874 else 5875 return false; 5876 } 5877 5878 return Seen; 5879} 5880 5881/// isOperand - Return true if this node is an operand of N. 5882/// 5883bool SDValue::isOperandOf(SDNode *N) const { 5884 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) 5885 if (*this == N->getOperand(i)) 5886 return true; 5887 return false; 5888} 5889 5890bool SDNode::isOperandOf(SDNode *N) const { 5891 for (unsigned i = 0, e = N->NumOperands; i != e; ++i) 5892 if (this == N->OperandList[i].getNode()) 5893 return true; 5894 return false; 5895} 5896 5897/// reachesChainWithoutSideEffects - Return true if this operand (which must 5898/// be a chain) reaches the specified operand without crossing any 5899/// side-effecting instructions on any chain path. In practice, this looks 5900/// through token factors and non-volatile loads. In order to remain efficient, 5901/// this only looks a couple of nodes in, it does not do an exhaustive search. 5902bool SDValue::reachesChainWithoutSideEffects(SDValue Dest, 5903 unsigned Depth) const { 5904 if (*this == Dest) return true; 5905 5906 // Don't search too deeply, we just want to be able to see through 5907 // TokenFactor's etc. 5908 if (Depth == 0) return false; 5909 5910 // If this is a token factor, all inputs to the TF happen in parallel. If any 5911 // of the operands of the TF does not reach dest, then we cannot do the xform. 5912 if (getOpcode() == ISD::TokenFactor) { 5913 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) 5914 if (!getOperand(i).reachesChainWithoutSideEffects(Dest, Depth-1)) 5915 return false; 5916 return true; 5917 } 5918 5919 // Loads don't have side effects, look through them. 5920 if (LoadSDNode *Ld = dyn_cast<LoadSDNode>(*this)) { 5921 if (!Ld->isVolatile()) 5922 return Ld->getChain().reachesChainWithoutSideEffects(Dest, Depth-1); 5923 } 5924 return false; 5925} 5926 5927/// hasPredecessor - Return true if N is a predecessor of this node. 5928/// N is either an operand of this node, or can be reached by recursively 5929/// traversing up the operands. 5930/// NOTE: This is an expensive method. Use it carefully. 5931bool SDNode::hasPredecessor(const SDNode *N) const { 5932 SmallPtrSet<const SDNode *, 32> Visited; 5933 SmallVector<const SDNode *, 16> Worklist; 5934 return hasPredecessorHelper(N, Visited, Worklist); 5935} 5936 5937bool SDNode::hasPredecessorHelper(const SDNode *N, 5938 SmallPtrSet<const SDNode *, 32> &Visited, 5939 SmallVector<const SDNode *, 16> &Worklist) const { 5940 if (Visited.empty()) { 5941 Worklist.push_back(this); 5942 } else { 5943 // Take a look in the visited set. If we've already encountered this node 5944 // we needn't search further. 5945 if (Visited.count(N)) 5946 return true; 5947 } 5948 5949 // Haven't visited N yet. Continue the search. 5950 while (!Worklist.empty()) { 5951 const SDNode *M = Worklist.pop_back_val(); 5952 for (unsigned i = 0, e = M->getNumOperands(); i != e; ++i) { 5953 SDNode *Op = M->getOperand(i).getNode(); 5954 if (Visited.insert(Op)) 5955 Worklist.push_back(Op); 5956 if (Op == N) 5957 return true; 5958 } 5959 } 5960 5961 return false; 5962} 5963 5964uint64_t SDNode::getConstantOperandVal(unsigned Num) const { 5965 assert(Num < NumOperands && "Invalid child # of SDNode!"); 5966 return cast<ConstantSDNode>(OperandList[Num])->getZExtValue(); 5967} 5968 5969SDValue SelectionDAG::UnrollVectorOp(SDNode *N, unsigned ResNE) { 5970 assert(N->getNumValues() == 1 && 5971 "Can't unroll a vector with multiple results!"); 5972 5973 EVT VT = N->getValueType(0); 5974 unsigned NE = VT.getVectorNumElements(); 5975 EVT EltVT = VT.getVectorElementType(); 5976 DebugLoc dl = N->getDebugLoc(); 5977 5978 SmallVector<SDValue, 8> Scalars; 5979 SmallVector<SDValue, 4> Operands(N->getNumOperands()); 5980 5981 // If ResNE is 0, fully unroll the vector op. 5982 if (ResNE == 0) 5983 ResNE = NE; 5984 else if (NE > ResNE) 5985 NE = ResNE; 5986 5987 unsigned i; 5988 for (i= 0; i != NE; ++i) { 5989 for (unsigned j = 0, e = N->getNumOperands(); j != e; ++j) { 5990 SDValue Operand = N->getOperand(j); 5991 EVT OperandVT = Operand.getValueType(); 5992 if (OperandVT.isVector()) { 5993 // A vector operand; extract a single element. 5994 EVT OperandEltVT = OperandVT.getVectorElementType(); 5995 Operands[j] = getNode(ISD::EXTRACT_VECTOR_ELT, dl, 5996 OperandEltVT, 5997 Operand, 5998 getConstant(i, TLI.getPointerTy())); 5999 } else { 6000 // A scalar operand; just use it as is. 6001 Operands[j] = Operand; 6002 } 6003 } 6004 6005 switch (N->getOpcode()) { 6006 default: 6007 Scalars.push_back(getNode(N->getOpcode(), dl, EltVT, 6008 &Operands[0], Operands.size())); 6009 break; 6010 case ISD::VSELECT: 6011 Scalars.push_back(getNode(ISD::SELECT, dl, EltVT, 6012 &Operands[0], Operands.size())); 6013 break; 6014 case ISD::SHL: 6015 case ISD::SRA: 6016 case ISD::SRL: 6017 case ISD::ROTL: 6018 case ISD::ROTR: 6019 Scalars.push_back(getNode(N->getOpcode(), dl, EltVT, Operands[0], 6020 getShiftAmountOperand(Operands[0].getValueType(), 6021 Operands[1]))); 6022 break; 6023 case ISD::SIGN_EXTEND_INREG: 6024 case ISD::FP_ROUND_INREG: { 6025 EVT ExtVT = cast<VTSDNode>(Operands[1])->getVT().getVectorElementType(); 6026 Scalars.push_back(getNode(N->getOpcode(), dl, EltVT, 6027 Operands[0], 6028 getValueType(ExtVT))); 6029 } 6030 } 6031 } 6032 6033 for (; i < ResNE; ++i) 6034 Scalars.push_back(getUNDEF(EltVT)); 6035 6036 return getNode(ISD::BUILD_VECTOR, dl, 6037 EVT::getVectorVT(*getContext(), EltVT, ResNE), 6038 &Scalars[0], Scalars.size()); 6039} 6040 6041 6042/// isConsecutiveLoad - Return true if LD is loading 'Bytes' bytes from a 6043/// location that is 'Dist' units away from the location that the 'Base' load 6044/// is loading from. 6045bool SelectionDAG::isConsecutiveLoad(LoadSDNode *LD, LoadSDNode *Base, 6046 unsigned Bytes, int Dist) const { 6047 if (LD->getChain() != Base->getChain()) 6048 return false; 6049 EVT VT = LD->getValueType(0); 6050 if (VT.getSizeInBits() / 8 != Bytes) 6051 return false; 6052 6053 SDValue Loc = LD->getOperand(1); 6054 SDValue BaseLoc = Base->getOperand(1); 6055 if (Loc.getOpcode() == ISD::FrameIndex) { 6056 if (BaseLoc.getOpcode() != ISD::FrameIndex) 6057 return false; 6058 const MachineFrameInfo *MFI = getMachineFunction().getFrameInfo(); 6059 int FI = cast<FrameIndexSDNode>(Loc)->getIndex(); 6060 int BFI = cast<FrameIndexSDNode>(BaseLoc)->getIndex(); 6061 int FS = MFI->getObjectSize(FI); 6062 int BFS = MFI->getObjectSize(BFI); 6063 if (FS != BFS || FS != (int)Bytes) return false; 6064 return MFI->getObjectOffset(FI) == (MFI->getObjectOffset(BFI) + Dist*Bytes); 6065 } 6066 6067 // Handle X+C 6068 if (isBaseWithConstantOffset(Loc) && Loc.getOperand(0) == BaseLoc && 6069 cast<ConstantSDNode>(Loc.getOperand(1))->getSExtValue() == Dist*Bytes) 6070 return true; 6071 6072 const GlobalValue *GV1 = NULL; 6073 const GlobalValue *GV2 = NULL; 6074 int64_t Offset1 = 0; 6075 int64_t Offset2 = 0; 6076 bool isGA1 = TLI.isGAPlusOffset(Loc.getNode(), GV1, Offset1); 6077 bool isGA2 = TLI.isGAPlusOffset(BaseLoc.getNode(), GV2, Offset2); 6078 if (isGA1 && isGA2 && GV1 == GV2) 6079 return Offset1 == (Offset2 + Dist*Bytes); 6080 return false; 6081} 6082 6083 6084/// InferPtrAlignment - Infer alignment of a load / store address. Return 0 if 6085/// it cannot be inferred. 6086unsigned SelectionDAG::InferPtrAlignment(SDValue Ptr) const { 6087 // If this is a GlobalAddress + cst, return the alignment. 6088 const GlobalValue *GV; 6089 int64_t GVOffset = 0; 6090 if (TLI.isGAPlusOffset(Ptr.getNode(), GV, GVOffset)) { 6091 unsigned PtrWidth = TLI.getPointerTy().getSizeInBits(); 6092 APInt KnownZero(PtrWidth, 0), KnownOne(PtrWidth, 0); 6093 llvm::ComputeMaskedBits(const_cast<GlobalValue*>(GV), KnownZero, KnownOne, 6094 TLI.getDataLayout()); 6095 unsigned AlignBits = KnownZero.countTrailingOnes(); 6096 unsigned Align = AlignBits ? 1 << std::min(31U, AlignBits) : 0; 6097 if (Align) 6098 return MinAlign(Align, GVOffset); 6099 } 6100 6101 // If this is a direct reference to a stack slot, use information about the 6102 // stack slot's alignment. 6103 int FrameIdx = 1 << 31; 6104 int64_t FrameOffset = 0; 6105 if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(Ptr)) { 6106 FrameIdx = FI->getIndex(); 6107 } else if (isBaseWithConstantOffset(Ptr) && 6108 isa<FrameIndexSDNode>(Ptr.getOperand(0))) { 6109 // Handle FI+Cst 6110 FrameIdx = cast<FrameIndexSDNode>(Ptr.getOperand(0))->getIndex(); 6111 FrameOffset = Ptr.getConstantOperandVal(1); 6112 } 6113 6114 if (FrameIdx != (1 << 31)) { 6115 const MachineFrameInfo &MFI = *getMachineFunction().getFrameInfo(); 6116 unsigned FIInfoAlign = MinAlign(MFI.getObjectAlignment(FrameIdx), 6117 FrameOffset); 6118 return FIInfoAlign; 6119 } 6120 6121 return 0; 6122} 6123 6124// getAddressSpace - Return the address space this GlobalAddress belongs to. 6125unsigned GlobalAddressSDNode::getAddressSpace() const { 6126 return getGlobal()->getType()->getAddressSpace(); 6127} 6128 6129 6130Type *ConstantPoolSDNode::getType() const { 6131 if (isMachineConstantPoolEntry()) 6132 return Val.MachineCPVal->getType(); 6133 return Val.ConstVal->getType(); 6134} 6135 6136bool BuildVectorSDNode::isConstantSplat(APInt &SplatValue, 6137 APInt &SplatUndef, 6138 unsigned &SplatBitSize, 6139 bool &HasAnyUndefs, 6140 unsigned MinSplatBits, 6141 bool isBigEndian) { 6142 EVT VT = getValueType(0); 6143 assert(VT.isVector() && "Expected a vector type"); 6144 unsigned sz = VT.getSizeInBits(); 6145 if (MinSplatBits > sz) 6146 return false; 6147 6148 SplatValue = APInt(sz, 0); 6149 SplatUndef = APInt(sz, 0); 6150 6151 // Get the bits. Bits with undefined values (when the corresponding element 6152 // of the vector is an ISD::UNDEF value) are set in SplatUndef and cleared 6153 // in SplatValue. If any of the values are not constant, give up and return 6154 // false. 6155 unsigned int nOps = getNumOperands(); 6156 assert(nOps > 0 && "isConstantSplat has 0-size build vector"); 6157 unsigned EltBitSize = VT.getVectorElementType().getSizeInBits(); 6158 6159 for (unsigned j = 0; j < nOps; ++j) { 6160 unsigned i = isBigEndian ? nOps-1-j : j; 6161 SDValue OpVal = getOperand(i); 6162 unsigned BitPos = j * EltBitSize; 6163 6164 if (OpVal.getOpcode() == ISD::UNDEF) 6165 SplatUndef |= APInt::getBitsSet(sz, BitPos, BitPos + EltBitSize); 6166 else if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(OpVal)) 6167 SplatValue |= CN->getAPIntValue().zextOrTrunc(EltBitSize). 6168 zextOrTrunc(sz) << BitPos; 6169 else if (ConstantFPSDNode *CN = dyn_cast<ConstantFPSDNode>(OpVal)) 6170 SplatValue |= CN->getValueAPF().bitcastToAPInt().zextOrTrunc(sz) <<BitPos; 6171 else 6172 return false; 6173 } 6174 6175 // The build_vector is all constants or undefs. Find the smallest element 6176 // size that splats the vector. 6177 6178 HasAnyUndefs = (SplatUndef != 0); 6179 while (sz > 8) { 6180 6181 unsigned HalfSize = sz / 2; 6182 APInt HighValue = SplatValue.lshr(HalfSize).trunc(HalfSize); 6183 APInt LowValue = SplatValue.trunc(HalfSize); 6184 APInt HighUndef = SplatUndef.lshr(HalfSize).trunc(HalfSize); 6185 APInt LowUndef = SplatUndef.trunc(HalfSize); 6186 6187 // If the two halves do not match (ignoring undef bits), stop here. 6188 if ((HighValue & ~LowUndef) != (LowValue & ~HighUndef) || 6189 MinSplatBits > HalfSize) 6190 break; 6191 6192 SplatValue = HighValue | LowValue; 6193 SplatUndef = HighUndef & LowUndef; 6194 6195 sz = HalfSize; 6196 } 6197 6198 SplatBitSize = sz; 6199 return true; 6200} 6201 6202bool ShuffleVectorSDNode::isSplatMask(const int *Mask, EVT VT) { 6203 // Find the first non-undef value in the shuffle mask. 6204 unsigned i, e; 6205 for (i = 0, e = VT.getVectorNumElements(); i != e && Mask[i] < 0; ++i) 6206 /* search */; 6207 6208 assert(i != e && "VECTOR_SHUFFLE node with all undef indices!"); 6209 6210 // Make sure all remaining elements are either undef or the same as the first 6211 // non-undef value. 6212 for (int Idx = Mask[i]; i != e; ++i) 6213 if (Mask[i] >= 0 && Mask[i] != Idx) 6214 return false; 6215 return true; 6216} 6217 6218#ifdef XDEBUG 6219static void checkForCyclesHelper(const SDNode *N, 6220 SmallPtrSet<const SDNode*, 32> &Visited, 6221 SmallPtrSet<const SDNode*, 32> &Checked) { 6222 // If this node has already been checked, don't check it again. 6223 if (Checked.count(N)) 6224 return; 6225 6226 // If a node has already been visited on this depth-first walk, reject it as 6227 // a cycle. 6228 if (!Visited.insert(N)) { 6229 dbgs() << "Offending node:\n"; 6230 N->dumprFull(); 6231 errs() << "Detected cycle in SelectionDAG\n"; 6232 abort(); 6233 } 6234 6235 for(unsigned i = 0, e = N->getNumOperands(); i != e; ++i) 6236 checkForCyclesHelper(N->getOperand(i).getNode(), Visited, Checked); 6237 6238 Checked.insert(N); 6239 Visited.erase(N); 6240} 6241#endif 6242 6243void llvm::checkForCycles(const llvm::SDNode *N) { 6244#ifdef XDEBUG 6245 assert(N && "Checking nonexistant SDNode"); 6246 SmallPtrSet<const SDNode*, 32> visited; 6247 SmallPtrSet<const SDNode*, 32> checked; 6248 checkForCyclesHelper(N, visited, checked); 6249#endif 6250} 6251 6252void llvm::checkForCycles(const llvm::SelectionDAG *DAG) { 6253 checkForCycles(DAG->getRoot().getNode()); 6254} 6255