SparcISelDAGToDAG.cpp revision d0b82b301d700217a716526f9329bb031e0d6578
1//===-- SparcISelDAGToDAG.cpp - A dag to dag inst selector for Sparc ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file was developed by Chris Lattner and is distributed under 6// the University of Illinois Open Source License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file defines an instruction selector for the SPARC target. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sparc.h" 15#include "SparcTargetMachine.h" 16#include "llvm/DerivedTypes.h" 17#include "llvm/Function.h" 18#include "llvm/Intrinsics.h" 19#include "llvm/CodeGen/MachineFrameInfo.h" 20#include "llvm/CodeGen/MachineFunction.h" 21#include "llvm/CodeGen/MachineInstrBuilder.h" 22#include "llvm/CodeGen/SelectionDAG.h" 23#include "llvm/CodeGen/SelectionDAGISel.h" 24#include "llvm/CodeGen/SSARegMap.h" 25#include "llvm/Target/TargetLowering.h" 26#include "llvm/Support/Debug.h" 27#include <queue> 28#include <set> 29using namespace llvm; 30 31//===----------------------------------------------------------------------===// 32// TargetLowering Implementation 33//===----------------------------------------------------------------------===// 34 35namespace SPISD { 36 enum { 37 FIRST_NUMBER = ISD::BUILTIN_OP_END+SP::INSTRUCTION_LIST_END, 38 CMPICC, // Compare two GPR operands, set icc. 39 CMPFCC, // Compare two FP operands, set fcc. 40 BRICC, // Branch to dest on icc condition 41 BRFCC, // Branch to dest on fcc condition 42 SELECT_ICC, // Select between two values using the current ICC flags. 43 SELECT_FCC, // Select between two values using the current FCC flags. 44 45 Hi, Lo, // Hi/Lo operations, typically on a global address. 46 47 FTOI, // FP to Int within a FP register. 48 ITOF, // Int to FP within a FP register. 49 50 CALL, // A call instruction. 51 RET_FLAG // Return with a flag operand. 52 }; 53} 54 55/// IntCondCCodeToICC - Convert a DAG integer condition code to a SPARC ICC 56/// condition. 57static SPCC::CondCodes IntCondCCodeToICC(ISD::CondCode CC) { 58 switch (CC) { 59 default: assert(0 && "Unknown integer condition code!"); 60 case ISD::SETEQ: return SPCC::ICC_E; 61 case ISD::SETNE: return SPCC::ICC_NE; 62 case ISD::SETLT: return SPCC::ICC_L; 63 case ISD::SETGT: return SPCC::ICC_G; 64 case ISD::SETLE: return SPCC::ICC_LE; 65 case ISD::SETGE: return SPCC::ICC_GE; 66 case ISD::SETULT: return SPCC::ICC_CS; 67 case ISD::SETULE: return SPCC::ICC_LEU; 68 case ISD::SETUGT: return SPCC::ICC_GU; 69 case ISD::SETUGE: return SPCC::ICC_CC; 70 } 71} 72 73/// FPCondCCodeToFCC - Convert a DAG floatingp oint condition code to a SPARC 74/// FCC condition. 75static SPCC::CondCodes FPCondCCodeToFCC(ISD::CondCode CC) { 76 switch (CC) { 77 default: assert(0 && "Unknown fp condition code!"); 78 case ISD::SETEQ: 79 case ISD::SETOEQ: return SPCC::FCC_E; 80 case ISD::SETNE: 81 case ISD::SETUNE: return SPCC::FCC_NE; 82 case ISD::SETLT: 83 case ISD::SETOLT: return SPCC::FCC_L; 84 case ISD::SETGT: 85 case ISD::SETOGT: return SPCC::FCC_G; 86 case ISD::SETLE: 87 case ISD::SETOLE: return SPCC::FCC_LE; 88 case ISD::SETGE: 89 case ISD::SETOGE: return SPCC::FCC_GE; 90 case ISD::SETULT: return SPCC::FCC_UL; 91 case ISD::SETULE: return SPCC::FCC_ULE; 92 case ISD::SETUGT: return SPCC::FCC_UG; 93 case ISD::SETUGE: return SPCC::FCC_UGE; 94 case ISD::SETUO: return SPCC::FCC_U; 95 case ISD::SETO: return SPCC::FCC_O; 96 case ISD::SETONE: return SPCC::FCC_LG; 97 case ISD::SETUEQ: return SPCC::FCC_UE; 98 } 99} 100 101namespace { 102 class SparcTargetLowering : public TargetLowering { 103 int VarArgsFrameOffset; // Frame offset to start of varargs area. 104 public: 105 SparcTargetLowering(TargetMachine &TM); 106 virtual SDOperand LowerOperation(SDOperand Op, SelectionDAG &DAG); 107 108 /// computeMaskedBitsForTargetNode - Determine which of the bits specified 109 /// in Mask are known to be either zero or one and return them in the 110 /// KnownZero/KnownOne bitsets. 111 virtual void computeMaskedBitsForTargetNode(const SDOperand Op, 112 uint64_t Mask, 113 uint64_t &KnownZero, 114 uint64_t &KnownOne, 115 unsigned Depth = 0) const; 116 117 virtual std::vector<SDOperand> 118 LowerArguments(Function &F, SelectionDAG &DAG); 119 virtual std::pair<SDOperand, SDOperand> 120 LowerCallTo(SDOperand Chain, const Type *RetTy, bool RetTyIsSigned, 121 bool isVarArg, unsigned CC, bool isTailCall, SDOperand Callee, 122 ArgListTy &Args, SelectionDAG &DAG); 123 virtual MachineBasicBlock *InsertAtEndOfBasicBlock(MachineInstr *MI, 124 MachineBasicBlock *MBB); 125 126 virtual const char *getTargetNodeName(unsigned Opcode) const; 127 }; 128} 129 130SparcTargetLowering::SparcTargetLowering(TargetMachine &TM) 131 : TargetLowering(TM) { 132 133 // Set up the register classes. 134 addRegisterClass(MVT::i32, SP::IntRegsRegisterClass); 135 addRegisterClass(MVT::f32, SP::FPRegsRegisterClass); 136 addRegisterClass(MVT::f64, SP::DFPRegsRegisterClass); 137 138 // Turn FP extload into load/fextend 139 setLoadXAction(ISD::EXTLOAD, MVT::f32, Expand); 140 141 // Custom legalize GlobalAddress nodes into LO/HI parts. 142 setOperationAction(ISD::GlobalAddress, MVT::i32, Custom); 143 setOperationAction(ISD::ConstantPool , MVT::i32, Custom); 144 145 // Sparc doesn't have sext_inreg, replace them with shl/sra 146 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i16, Expand); 147 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i8 , Expand); 148 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1 , Expand); 149 150 // Sparc has no REM operation. 151 setOperationAction(ISD::UREM, MVT::i32, Expand); 152 setOperationAction(ISD::SREM, MVT::i32, Expand); 153 154 // Custom expand fp<->sint 155 setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom); 156 setOperationAction(ISD::SINT_TO_FP, MVT::i32, Custom); 157 158 // Expand fp<->uint 159 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Expand); 160 setOperationAction(ISD::UINT_TO_FP, MVT::i32, Expand); 161 162 setOperationAction(ISD::BIT_CONVERT, MVT::f32, Expand); 163 setOperationAction(ISD::BIT_CONVERT, MVT::i32, Expand); 164 165 // Sparc has no select or setcc: expand to SELECT_CC. 166 setOperationAction(ISD::SELECT, MVT::i32, Expand); 167 setOperationAction(ISD::SELECT, MVT::f32, Expand); 168 setOperationAction(ISD::SELECT, MVT::f64, Expand); 169 setOperationAction(ISD::SETCC, MVT::i32, Expand); 170 setOperationAction(ISD::SETCC, MVT::f32, Expand); 171 setOperationAction(ISD::SETCC, MVT::f64, Expand); 172 173 // Sparc doesn't have BRCOND either, it has BR_CC. 174 setOperationAction(ISD::BRCOND, MVT::Other, Expand); 175 setOperationAction(ISD::BRIND, MVT::Other, Expand); 176 setOperationAction(ISD::BR_JT, MVT::Other, Expand); 177 setOperationAction(ISD::BR_CC, MVT::i32, Custom); 178 setOperationAction(ISD::BR_CC, MVT::f32, Custom); 179 setOperationAction(ISD::BR_CC, MVT::f64, Custom); 180 181 setOperationAction(ISD::SELECT_CC, MVT::i32, Custom); 182 setOperationAction(ISD::SELECT_CC, MVT::f32, Custom); 183 setOperationAction(ISD::SELECT_CC, MVT::f64, Custom); 184 185 // SPARC has no intrinsics for these particular operations. 186 setOperationAction(ISD::MEMMOVE, MVT::Other, Expand); 187 setOperationAction(ISD::MEMSET, MVT::Other, Expand); 188 setOperationAction(ISD::MEMCPY, MVT::Other, Expand); 189 190 setOperationAction(ISD::FSIN , MVT::f64, Expand); 191 setOperationAction(ISD::FCOS , MVT::f64, Expand); 192 setOperationAction(ISD::FSIN , MVT::f32, Expand); 193 setOperationAction(ISD::FCOS , MVT::f32, Expand); 194 setOperationAction(ISD::CTPOP, MVT::i32, Expand); 195 setOperationAction(ISD::CTTZ , MVT::i32, Expand); 196 setOperationAction(ISD::CTLZ , MVT::i32, Expand); 197 setOperationAction(ISD::ROTL , MVT::i32, Expand); 198 setOperationAction(ISD::ROTR , MVT::i32, Expand); 199 setOperationAction(ISD::BSWAP, MVT::i32, Expand); 200 setOperationAction(ISD::FCOPYSIGN, MVT::f64, Expand); 201 setOperationAction(ISD::FCOPYSIGN, MVT::f32, Expand); 202 203 setOperationAction(ISD::SHL_PARTS, MVT::i32, Expand); 204 setOperationAction(ISD::SRA_PARTS, MVT::i32, Expand); 205 setOperationAction(ISD::SRL_PARTS, MVT::i32, Expand); 206 207 // We don't have line number support yet. 208 setOperationAction(ISD::LOCATION, MVT::Other, Expand); 209 setOperationAction(ISD::DEBUG_LOC, MVT::Other, Expand); 210 setOperationAction(ISD::LABEL, MVT::Other, Expand); 211 212 // RET must be custom lowered, to meet ABI requirements 213 setOperationAction(ISD::RET , MVT::Other, Custom); 214 215 // VASTART needs to be custom lowered to use the VarArgsFrameIndex. 216 setOperationAction(ISD::VASTART , MVT::Other, Custom); 217 // VAARG needs to be lowered to not do unaligned accesses for doubles. 218 setOperationAction(ISD::VAARG , MVT::Other, Custom); 219 220 // Use the default implementation. 221 setOperationAction(ISD::VACOPY , MVT::Other, Expand); 222 setOperationAction(ISD::VAEND , MVT::Other, Expand); 223 setOperationAction(ISD::STACKSAVE , MVT::Other, Expand); 224 setOperationAction(ISD::STACKRESTORE , MVT::Other, Expand); 225 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32 , Custom); 226 227 setOperationAction(ISD::ConstantFP, MVT::f64, Expand); 228 setOperationAction(ISD::ConstantFP, MVT::f32, Expand); 229 230 setStackPointerRegisterToSaveRestore(SP::O6); 231 232 if (TM.getSubtarget<SparcSubtarget>().isV9()) { 233 setOperationAction(ISD::CTPOP, MVT::i32, Legal); 234 } 235 236 computeRegisterProperties(); 237} 238 239const char *SparcTargetLowering::getTargetNodeName(unsigned Opcode) const { 240 switch (Opcode) { 241 default: return 0; 242 case SPISD::CMPICC: return "SPISD::CMPICC"; 243 case SPISD::CMPFCC: return "SPISD::CMPFCC"; 244 case SPISD::BRICC: return "SPISD::BRICC"; 245 case SPISD::BRFCC: return "SPISD::BRFCC"; 246 case SPISD::SELECT_ICC: return "SPISD::SELECT_ICC"; 247 case SPISD::SELECT_FCC: return "SPISD::SELECT_FCC"; 248 case SPISD::Hi: return "SPISD::Hi"; 249 case SPISD::Lo: return "SPISD::Lo"; 250 case SPISD::FTOI: return "SPISD::FTOI"; 251 case SPISD::ITOF: return "SPISD::ITOF"; 252 case SPISD::CALL: return "SPISD::CALL"; 253 case SPISD::RET_FLAG: return "SPISD::RET_FLAG"; 254 } 255} 256 257/// isMaskedValueZeroForTargetNode - Return true if 'Op & Mask' is known to 258/// be zero. Op is expected to be a target specific node. Used by DAG 259/// combiner. 260void SparcTargetLowering::computeMaskedBitsForTargetNode(const SDOperand Op, 261 uint64_t Mask, 262 uint64_t &KnownZero, 263 uint64_t &KnownOne, 264 unsigned Depth) const { 265 uint64_t KnownZero2, KnownOne2; 266 KnownZero = KnownOne = 0; // Don't know anything. 267 268 switch (Op.getOpcode()) { 269 default: break; 270 case SPISD::SELECT_ICC: 271 case SPISD::SELECT_FCC: 272 ComputeMaskedBits(Op.getOperand(1), Mask, KnownZero, KnownOne, Depth+1); 273 ComputeMaskedBits(Op.getOperand(0), Mask, KnownZero2, KnownOne2, Depth+1); 274 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?"); 275 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?"); 276 277 // Only known if known in both the LHS and RHS. 278 KnownOne &= KnownOne2; 279 KnownZero &= KnownZero2; 280 break; 281 } 282} 283 284/// LowerArguments - V8 uses a very simple ABI, where all values are passed in 285/// either one or two GPRs, including FP values. TODO: we should pass FP values 286/// in FP registers for fastcc functions. 287std::vector<SDOperand> 288SparcTargetLowering::LowerArguments(Function &F, SelectionDAG &DAG) { 289 MachineFunction &MF = DAG.getMachineFunction(); 290 SSARegMap *RegMap = MF.getSSARegMap(); 291 std::vector<SDOperand> ArgValues; 292 293 static const unsigned ArgRegs[] = { 294 SP::I0, SP::I1, SP::I2, SP::I3, SP::I4, SP::I5 295 }; 296 297 const unsigned *CurArgReg = ArgRegs, *ArgRegEnd = ArgRegs+6; 298 unsigned ArgOffset = 68; 299 300 SDOperand Root = DAG.getRoot(); 301 std::vector<SDOperand> OutChains; 302 303 for (Function::arg_iterator I = F.arg_begin(), E = F.arg_end(); I != E; ++I) { 304 MVT::ValueType ObjectVT = getValueType(I->getType()); 305 306 switch (ObjectVT) { 307 default: assert(0 && "Unhandled argument type!"); 308 case MVT::i1: 309 case MVT::i8: 310 case MVT::i16: 311 case MVT::i32: 312 if (I->use_empty()) { // Argument is dead. 313 if (CurArgReg < ArgRegEnd) ++CurArgReg; 314 ArgValues.push_back(DAG.getNode(ISD::UNDEF, ObjectVT)); 315 } else if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR 316 unsigned VReg = RegMap->createVirtualRegister(&SP::IntRegsRegClass); 317 MF.addLiveIn(*CurArgReg++, VReg); 318 SDOperand Arg = DAG.getCopyFromReg(Root, VReg, MVT::i32); 319 if (ObjectVT != MVT::i32) { 320 unsigned AssertOp = ISD::AssertSext; 321 Arg = DAG.getNode(AssertOp, MVT::i32, Arg, 322 DAG.getValueType(ObjectVT)); 323 Arg = DAG.getNode(ISD::TRUNCATE, ObjectVT, Arg); 324 } 325 ArgValues.push_back(Arg); 326 } else { 327 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset); 328 SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32); 329 SDOperand Load; 330 if (ObjectVT == MVT::i32) { 331 Load = DAG.getLoad(MVT::i32, Root, FIPtr, NULL, 0); 332 } else { 333 ISD::LoadExtType LoadOp = ISD::SEXTLOAD; 334 335 // Sparc is big endian, so add an offset based on the ObjectVT. 336 unsigned Offset = 4-std::max(1U, MVT::getSizeInBits(ObjectVT)/8); 337 FIPtr = DAG.getNode(ISD::ADD, MVT::i32, FIPtr, 338 DAG.getConstant(Offset, MVT::i32)); 339 Load = DAG.getExtLoad(LoadOp, MVT::i32, Root, FIPtr, 340 NULL, 0, ObjectVT); 341 Load = DAG.getNode(ISD::TRUNCATE, ObjectVT, Load); 342 } 343 ArgValues.push_back(Load); 344 } 345 346 ArgOffset += 4; 347 break; 348 case MVT::f32: 349 if (I->use_empty()) { // Argument is dead. 350 if (CurArgReg < ArgRegEnd) ++CurArgReg; 351 ArgValues.push_back(DAG.getNode(ISD::UNDEF, ObjectVT)); 352 } else if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR 353 // FP value is passed in an integer register. 354 unsigned VReg = RegMap->createVirtualRegister(&SP::IntRegsRegClass); 355 MF.addLiveIn(*CurArgReg++, VReg); 356 SDOperand Arg = DAG.getCopyFromReg(Root, VReg, MVT::i32); 357 358 Arg = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, Arg); 359 ArgValues.push_back(Arg); 360 } else { 361 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset); 362 SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32); 363 SDOperand Load = DAG.getLoad(MVT::f32, Root, FIPtr, NULL, 0); 364 ArgValues.push_back(Load); 365 } 366 ArgOffset += 4; 367 break; 368 369 case MVT::i64: 370 case MVT::f64: 371 if (I->use_empty()) { // Argument is dead. 372 if (CurArgReg < ArgRegEnd) ++CurArgReg; 373 if (CurArgReg < ArgRegEnd) ++CurArgReg; 374 ArgValues.push_back(DAG.getNode(ISD::UNDEF, ObjectVT)); 375 } else if (/* FIXME: Apparently this isn't safe?? */ 376 0 && CurArgReg == ArgRegEnd && ObjectVT == MVT::f64 && 377 ((CurArgReg-ArgRegs) & 1) == 0) { 378 // If this is a double argument and the whole thing lives on the stack, 379 // and the argument is aligned, load the double straight from the stack. 380 // We can't do a load in cases like void foo([6ints], int,double), 381 // because the double wouldn't be aligned! 382 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(8, ArgOffset); 383 SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32); 384 ArgValues.push_back(DAG.getLoad(MVT::f64, Root, FIPtr, NULL, 0)); 385 } else { 386 SDOperand HiVal; 387 if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR 388 unsigned VRegHi = RegMap->createVirtualRegister(&SP::IntRegsRegClass); 389 MF.addLiveIn(*CurArgReg++, VRegHi); 390 HiVal = DAG.getCopyFromReg(Root, VRegHi, MVT::i32); 391 } else { 392 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset); 393 SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32); 394 HiVal = DAG.getLoad(MVT::i32, Root, FIPtr, NULL, 0); 395 } 396 397 SDOperand LoVal; 398 if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR 399 unsigned VRegLo = RegMap->createVirtualRegister(&SP::IntRegsRegClass); 400 MF.addLiveIn(*CurArgReg++, VRegLo); 401 LoVal = DAG.getCopyFromReg(Root, VRegLo, MVT::i32); 402 } else { 403 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset+4); 404 SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32); 405 LoVal = DAG.getLoad(MVT::i32, Root, FIPtr, NULL, 0); 406 } 407 408 // Compose the two halves together into an i64 unit. 409 SDOperand WholeValue = 410 DAG.getNode(ISD::BUILD_PAIR, MVT::i64, LoVal, HiVal); 411 412 // If we want a double, do a bit convert. 413 if (ObjectVT == MVT::f64) 414 WholeValue = DAG.getNode(ISD::BIT_CONVERT, MVT::f64, WholeValue); 415 416 ArgValues.push_back(WholeValue); 417 } 418 ArgOffset += 8; 419 break; 420 } 421 } 422 423 // Store remaining ArgRegs to the stack if this is a varargs function. 424 if (F.getFunctionType()->isVarArg()) { 425 // Remember the vararg offset for the va_start implementation. 426 VarArgsFrameOffset = ArgOffset; 427 428 for (; CurArgReg != ArgRegEnd; ++CurArgReg) { 429 unsigned VReg = RegMap->createVirtualRegister(&SP::IntRegsRegClass); 430 MF.addLiveIn(*CurArgReg, VReg); 431 SDOperand Arg = DAG.getCopyFromReg(DAG.getRoot(), VReg, MVT::i32); 432 433 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset); 434 SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32); 435 436 OutChains.push_back(DAG.getStore(DAG.getRoot(), Arg, FIPtr, NULL, 0)); 437 ArgOffset += 4; 438 } 439 } 440 441 if (!OutChains.empty()) 442 DAG.setRoot(DAG.getNode(ISD::TokenFactor, MVT::Other, 443 &OutChains[0], OutChains.size())); 444 445 // Finally, inform the code generator which regs we return values in. 446 switch (getValueType(F.getReturnType())) { 447 default: assert(0 && "Unknown type!"); 448 case MVT::isVoid: break; 449 case MVT::i1: 450 case MVT::i8: 451 case MVT::i16: 452 case MVT::i32: 453 MF.addLiveOut(SP::I0); 454 break; 455 case MVT::i64: 456 MF.addLiveOut(SP::I0); 457 MF.addLiveOut(SP::I1); 458 break; 459 case MVT::f32: 460 MF.addLiveOut(SP::F0); 461 break; 462 case MVT::f64: 463 MF.addLiveOut(SP::D0); 464 break; 465 } 466 467 return ArgValues; 468} 469 470std::pair<SDOperand, SDOperand> 471SparcTargetLowering::LowerCallTo(SDOperand Chain, const Type *RetTy, 472 bool RetTyIsSigned, bool isVarArg, unsigned CC, 473 bool isTailCall, SDOperand Callee, 474 ArgListTy &Args, SelectionDAG &DAG) { 475 // Count the size of the outgoing arguments. 476 unsigned ArgsSize = 0; 477 for (unsigned i = 0, e = Args.size(); i != e; ++i) { 478 switch (getValueType(Args[i].Ty)) { 479 default: assert(0 && "Unknown value type!"); 480 case MVT::i1: 481 case MVT::i8: 482 case MVT::i16: 483 case MVT::i32: 484 case MVT::f32: 485 ArgsSize += 4; 486 break; 487 case MVT::i64: 488 case MVT::f64: 489 ArgsSize += 8; 490 break; 491 } 492 } 493 if (ArgsSize > 4*6) 494 ArgsSize -= 4*6; // Space for first 6 arguments is prereserved. 495 else 496 ArgsSize = 0; 497 498 // Keep stack frames 8-byte aligned. 499 ArgsSize = (ArgsSize+7) & ~7; 500 501 Chain = DAG.getCALLSEQ_START(Chain,DAG.getConstant(ArgsSize, getPointerTy())); 502 503 SDOperand StackPtr; 504 std::vector<SDOperand> Stores; 505 std::vector<SDOperand> RegValuesToPass; 506 unsigned ArgOffset = 68; 507 for (unsigned i = 0, e = Args.size(); i != e; ++i) { 508 SDOperand Val = Args[i].Node; 509 MVT::ValueType ObjectVT = Val.getValueType(); 510 SDOperand ValToStore(0, 0); 511 unsigned ObjSize; 512 switch (ObjectVT) { 513 default: assert(0 && "Unhandled argument type!"); 514 case MVT::i1: 515 case MVT::i8: 516 case MVT::i16: { 517 // Promote the integer to 32-bits. If the input type is signed, use a 518 // sign extend, otherwise use a zero extend. 519 ISD::NodeType ExtendKind = ISD::ANY_EXTEND; 520 if (Args[i].isSExt) 521 ExtendKind = ISD::SIGN_EXTEND; 522 else if (Args[i].isZExt) 523 ExtendKind = ISD::ZERO_EXTEND; 524 Val = DAG.getNode(ExtendKind, MVT::i32, Val); 525 // FALL THROUGH 526 } 527 case MVT::i32: 528 ObjSize = 4; 529 530 if (RegValuesToPass.size() >= 6) { 531 ValToStore = Val; 532 } else { 533 RegValuesToPass.push_back(Val); 534 } 535 break; 536 case MVT::f32: 537 ObjSize = 4; 538 if (RegValuesToPass.size() >= 6) { 539 ValToStore = Val; 540 } else { 541 // Convert this to a FP value in an int reg. 542 Val = DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Val); 543 RegValuesToPass.push_back(Val); 544 } 545 break; 546 case MVT::f64: 547 ObjSize = 8; 548 // If we can store this directly into the outgoing slot, do so. We can 549 // do this when all ArgRegs are used and if the outgoing slot is aligned. 550 // FIXME: McGill/misr fails with this. 551 if (0 && RegValuesToPass.size() >= 6 && ((ArgOffset-68) & 7) == 0) { 552 ValToStore = Val; 553 break; 554 } 555 556 // Otherwise, convert this to a FP value in int regs. 557 Val = DAG.getNode(ISD::BIT_CONVERT, MVT::i64, Val); 558 // FALL THROUGH 559 case MVT::i64: 560 ObjSize = 8; 561 if (RegValuesToPass.size() >= 6) { 562 ValToStore = Val; // Whole thing is passed in memory. 563 break; 564 } 565 566 // Split the value into top and bottom part. Top part goes in a reg. 567 SDOperand Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, getPointerTy(), Val, 568 DAG.getConstant(1, MVT::i32)); 569 SDOperand Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, getPointerTy(), Val, 570 DAG.getConstant(0, MVT::i32)); 571 RegValuesToPass.push_back(Hi); 572 573 if (RegValuesToPass.size() >= 6) { 574 ValToStore = Lo; 575 ArgOffset += 4; 576 ObjSize = 4; 577 } else { 578 RegValuesToPass.push_back(Lo); 579 } 580 break; 581 } 582 583 if (ValToStore.Val) { 584 if (!StackPtr.Val) { 585 StackPtr = DAG.getRegister(SP::O6, MVT::i32); 586 } 587 SDOperand PtrOff = DAG.getConstant(ArgOffset, getPointerTy()); 588 PtrOff = DAG.getNode(ISD::ADD, MVT::i32, StackPtr, PtrOff); 589 Stores.push_back(DAG.getStore(Chain, ValToStore, PtrOff, NULL, 0)); 590 } 591 ArgOffset += ObjSize; 592 } 593 594 // Emit all stores, make sure the occur before any copies into physregs. 595 if (!Stores.empty()) 596 Chain = DAG.getNode(ISD::TokenFactor, MVT::Other, &Stores[0],Stores.size()); 597 598 static const unsigned ArgRegs[] = { 599 SP::O0, SP::O1, SP::O2, SP::O3, SP::O4, SP::O5 600 }; 601 602 // Build a sequence of copy-to-reg nodes chained together with token chain 603 // and flag operands which copy the outgoing args into O[0-5]. 604 SDOperand InFlag; 605 for (unsigned i = 0, e = RegValuesToPass.size(); i != e; ++i) { 606 Chain = DAG.getCopyToReg(Chain, ArgRegs[i], RegValuesToPass[i], InFlag); 607 InFlag = Chain.getValue(1); 608 } 609 610 // If the callee is a GlobalAddress node (quite common, every direct call is) 611 // turn it into a TargetGlobalAddress node so that legalize doesn't hack it. 612 // Likewise ExternalSymbol -> TargetExternalSymbol. 613 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) 614 Callee = DAG.getTargetGlobalAddress(G->getGlobal(), MVT::i32); 615 else if (ExternalSymbolSDNode *E = dyn_cast<ExternalSymbolSDNode>(Callee)) 616 Callee = DAG.getTargetExternalSymbol(E->getSymbol(), MVT::i32); 617 618 std::vector<MVT::ValueType> NodeTys; 619 NodeTys.push_back(MVT::Other); // Returns a chain 620 NodeTys.push_back(MVT::Flag); // Returns a flag for retval copy to use. 621 SDOperand Ops[] = { Chain, Callee, InFlag }; 622 Chain = DAG.getNode(SPISD::CALL, NodeTys, Ops, InFlag.Val ? 3 : 2); 623 InFlag = Chain.getValue(1); 624 625 MVT::ValueType RetTyVT = getValueType(RetTy); 626 SDOperand RetVal; 627 if (RetTyVT != MVT::isVoid) { 628 switch (RetTyVT) { 629 default: assert(0 && "Unknown value type to return!"); 630 case MVT::i1: 631 case MVT::i8: 632 case MVT::i16: { 633 RetVal = DAG.getCopyFromReg(Chain, SP::O0, MVT::i32, InFlag); 634 Chain = RetVal.getValue(1); 635 636 // Add a note to keep track of whether it is sign or zero extended. 637 ISD::NodeType AssertKind = ISD::AssertZext; 638 if (RetTyIsSigned) 639 AssertKind = ISD::AssertSext; 640 RetVal = DAG.getNode(AssertKind, MVT::i32, RetVal, 641 DAG.getValueType(RetTyVT)); 642 RetVal = DAG.getNode(ISD::TRUNCATE, RetTyVT, RetVal); 643 break; 644 } 645 case MVT::i32: 646 RetVal = DAG.getCopyFromReg(Chain, SP::O0, MVT::i32, InFlag); 647 Chain = RetVal.getValue(1); 648 break; 649 case MVT::f32: 650 RetVal = DAG.getCopyFromReg(Chain, SP::F0, MVT::f32, InFlag); 651 Chain = RetVal.getValue(1); 652 break; 653 case MVT::f64: 654 RetVal = DAG.getCopyFromReg(Chain, SP::D0, MVT::f64, InFlag); 655 Chain = RetVal.getValue(1); 656 break; 657 case MVT::i64: 658 SDOperand Lo = DAG.getCopyFromReg(Chain, SP::O1, MVT::i32, InFlag); 659 SDOperand Hi = DAG.getCopyFromReg(Lo.getValue(1), SP::O0, MVT::i32, 660 Lo.getValue(2)); 661 RetVal = DAG.getNode(ISD::BUILD_PAIR, MVT::i64, Lo, Hi); 662 Chain = Hi.getValue(1); 663 break; 664 } 665 } 666 667 Chain = DAG.getNode(ISD::CALLSEQ_END, MVT::Other, Chain, 668 DAG.getConstant(ArgsSize, getPointerTy())); 669 670 return std::make_pair(RetVal, Chain); 671} 672 673// Look at LHS/RHS/CC and see if they are a lowered setcc instruction. If so 674// set LHS/RHS and SPCC to the LHS/RHS of the setcc and SPCC to the condition. 675static void LookThroughSetCC(SDOperand &LHS, SDOperand &RHS, 676 ISD::CondCode CC, unsigned &SPCC) { 677 if (isa<ConstantSDNode>(RHS) && cast<ConstantSDNode>(RHS)->getValue() == 0 && 678 CC == ISD::SETNE && 679 ((LHS.getOpcode() == SPISD::SELECT_ICC && 680 LHS.getOperand(3).getOpcode() == SPISD::CMPICC) || 681 (LHS.getOpcode() == SPISD::SELECT_FCC && 682 LHS.getOperand(3).getOpcode() == SPISD::CMPFCC)) && 683 isa<ConstantSDNode>(LHS.getOperand(0)) && 684 isa<ConstantSDNode>(LHS.getOperand(1)) && 685 cast<ConstantSDNode>(LHS.getOperand(0))->getValue() == 1 && 686 cast<ConstantSDNode>(LHS.getOperand(1))->getValue() == 0) { 687 SDOperand CMPCC = LHS.getOperand(3); 688 SPCC = cast<ConstantSDNode>(LHS.getOperand(2))->getValue(); 689 LHS = CMPCC.getOperand(0); 690 RHS = CMPCC.getOperand(1); 691 } 692} 693 694 695SDOperand SparcTargetLowering:: 696LowerOperation(SDOperand Op, SelectionDAG &DAG) { 697 switch (Op.getOpcode()) { 698 default: assert(0 && "Should not custom lower this!"); 699 case ISD::GlobalAddress: { 700 GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal(); 701 SDOperand GA = DAG.getTargetGlobalAddress(GV, MVT::i32); 702 SDOperand Hi = DAG.getNode(SPISD::Hi, MVT::i32, GA); 703 SDOperand Lo = DAG.getNode(SPISD::Lo, MVT::i32, GA); 704 return DAG.getNode(ISD::ADD, MVT::i32, Lo, Hi); 705 } 706 case ISD::ConstantPool: { 707 Constant *C = cast<ConstantPoolSDNode>(Op)->getConstVal(); 708 SDOperand CP = DAG.getTargetConstantPool(C, MVT::i32, 709 cast<ConstantPoolSDNode>(Op)->getAlignment()); 710 SDOperand Hi = DAG.getNode(SPISD::Hi, MVT::i32, CP); 711 SDOperand Lo = DAG.getNode(SPISD::Lo, MVT::i32, CP); 712 return DAG.getNode(ISD::ADD, MVT::i32, Lo, Hi); 713 } 714 case ISD::FP_TO_SINT: 715 // Convert the fp value to integer in an FP register. 716 assert(Op.getValueType() == MVT::i32); 717 Op = DAG.getNode(SPISD::FTOI, MVT::f32, Op.getOperand(0)); 718 return DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Op); 719 case ISD::SINT_TO_FP: { 720 assert(Op.getOperand(0).getValueType() == MVT::i32); 721 SDOperand Tmp = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, Op.getOperand(0)); 722 // Convert the int value to FP in an FP register. 723 return DAG.getNode(SPISD::ITOF, Op.getValueType(), Tmp); 724 } 725 case ISD::BR_CC: { 726 SDOperand Chain = Op.getOperand(0); 727 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get(); 728 SDOperand LHS = Op.getOperand(2); 729 SDOperand RHS = Op.getOperand(3); 730 SDOperand Dest = Op.getOperand(4); 731 unsigned Opc, SPCC = ~0U; 732 733 // If this is a br_cc of a "setcc", and if the setcc got lowered into 734 // an CMP[IF]CC/SELECT_[IF]CC pair, find the original compared values. 735 LookThroughSetCC(LHS, RHS, CC, SPCC); 736 737 // Get the condition flag. 738 SDOperand CompareFlag; 739 if (LHS.getValueType() == MVT::i32) { 740 std::vector<MVT::ValueType> VTs; 741 VTs.push_back(MVT::i32); 742 VTs.push_back(MVT::Flag); 743 SDOperand Ops[2] = { LHS, RHS }; 744 CompareFlag = DAG.getNode(SPISD::CMPICC, VTs, Ops, 2).getValue(1); 745 if (SPCC == ~0U) SPCC = IntCondCCodeToICC(CC); 746 Opc = SPISD::BRICC; 747 } else { 748 CompareFlag = DAG.getNode(SPISD::CMPFCC, MVT::Flag, LHS, RHS); 749 if (SPCC == ~0U) SPCC = FPCondCCodeToFCC(CC); 750 Opc = SPISD::BRFCC; 751 } 752 return DAG.getNode(Opc, MVT::Other, Chain, Dest, 753 DAG.getConstant(SPCC, MVT::i32), CompareFlag); 754 } 755 case ISD::SELECT_CC: { 756 SDOperand LHS = Op.getOperand(0); 757 SDOperand RHS = Op.getOperand(1); 758 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get(); 759 SDOperand TrueVal = Op.getOperand(2); 760 SDOperand FalseVal = Op.getOperand(3); 761 unsigned Opc, SPCC = ~0U; 762 763 // If this is a select_cc of a "setcc", and if the setcc got lowered into 764 // an CMP[IF]CC/SELECT_[IF]CC pair, find the original compared values. 765 LookThroughSetCC(LHS, RHS, CC, SPCC); 766 767 SDOperand CompareFlag; 768 if (LHS.getValueType() == MVT::i32) { 769 std::vector<MVT::ValueType> VTs; 770 VTs.push_back(LHS.getValueType()); // subcc returns a value 771 VTs.push_back(MVT::Flag); 772 SDOperand Ops[2] = { LHS, RHS }; 773 CompareFlag = DAG.getNode(SPISD::CMPICC, VTs, Ops, 2).getValue(1); 774 Opc = SPISD::SELECT_ICC; 775 if (SPCC == ~0U) SPCC = IntCondCCodeToICC(CC); 776 } else { 777 CompareFlag = DAG.getNode(SPISD::CMPFCC, MVT::Flag, LHS, RHS); 778 Opc = SPISD::SELECT_FCC; 779 if (SPCC == ~0U) SPCC = FPCondCCodeToFCC(CC); 780 } 781 return DAG.getNode(Opc, TrueVal.getValueType(), TrueVal, FalseVal, 782 DAG.getConstant(SPCC, MVT::i32), CompareFlag); 783 } 784 case ISD::VASTART: { 785 // vastart just stores the address of the VarArgsFrameIndex slot into the 786 // memory location argument. 787 SDOperand Offset = DAG.getNode(ISD::ADD, MVT::i32, 788 DAG.getRegister(SP::I6, MVT::i32), 789 DAG.getConstant(VarArgsFrameOffset, MVT::i32)); 790 SrcValueSDNode *SV = cast<SrcValueSDNode>(Op.getOperand(2)); 791 return DAG.getStore(Op.getOperand(0), Offset, 792 Op.getOperand(1), SV->getValue(), SV->getOffset()); 793 } 794 case ISD::VAARG: { 795 SDNode *Node = Op.Val; 796 MVT::ValueType VT = Node->getValueType(0); 797 SDOperand InChain = Node->getOperand(0); 798 SDOperand VAListPtr = Node->getOperand(1); 799 SrcValueSDNode *SV = cast<SrcValueSDNode>(Node->getOperand(2)); 800 SDOperand VAList = DAG.getLoad(getPointerTy(), InChain, VAListPtr, 801 SV->getValue(), SV->getOffset()); 802 // Increment the pointer, VAList, to the next vaarg 803 SDOperand NextPtr = DAG.getNode(ISD::ADD, getPointerTy(), VAList, 804 DAG.getConstant(MVT::getSizeInBits(VT)/8, 805 getPointerTy())); 806 // Store the incremented VAList to the legalized pointer 807 InChain = DAG.getStore(VAList.getValue(1), NextPtr, 808 VAListPtr, SV->getValue(), SV->getOffset()); 809 // Load the actual argument out of the pointer VAList, unless this is an 810 // f64 load. 811 if (VT != MVT::f64) { 812 return DAG.getLoad(VT, InChain, VAList, NULL, 0); 813 } else { 814 // Otherwise, load it as i64, then do a bitconvert. 815 SDOperand V = DAG.getLoad(MVT::i64, InChain, VAList, NULL, 0); 816 std::vector<MVT::ValueType> Tys; 817 Tys.push_back(MVT::f64); 818 Tys.push_back(MVT::Other); 819 // Bit-Convert the value to f64. 820 SDOperand Ops[2] = { DAG.getNode(ISD::BIT_CONVERT, MVT::f64, V), 821 V.getValue(1) }; 822 return DAG.getNode(ISD::MERGE_VALUES, Tys, Ops, 2); 823 } 824 } 825 case ISD::DYNAMIC_STACKALLOC: { 826 SDOperand Chain = Op.getOperand(0); // Legalize the chain. 827 SDOperand Size = Op.getOperand(1); // Legalize the size. 828 829 unsigned SPReg = SP::O6; 830 SDOperand SP = DAG.getCopyFromReg(Chain, SPReg, MVT::i32); 831 SDOperand NewSP = DAG.getNode(ISD::SUB, MVT::i32, SP, Size); // Value 832 Chain = DAG.getCopyToReg(SP.getValue(1), SPReg, NewSP); // Output chain 833 834 // The resultant pointer is actually 16 words from the bottom of the stack, 835 // to provide a register spill area. 836 SDOperand NewVal = DAG.getNode(ISD::ADD, MVT::i32, NewSP, 837 DAG.getConstant(96, MVT::i32)); 838 std::vector<MVT::ValueType> Tys; 839 Tys.push_back(MVT::i32); 840 Tys.push_back(MVT::Other); 841 SDOperand Ops[2] = { NewVal, Chain }; 842 return DAG.getNode(ISD::MERGE_VALUES, Tys, Ops, 2); 843 } 844 case ISD::RET: { 845 SDOperand Copy; 846 847 switch(Op.getNumOperands()) { 848 default: 849 assert(0 && "Do not know how to return this many arguments!"); 850 abort(); 851 case 1: 852 return SDOperand(); // ret void is legal 853 case 3: { 854 unsigned ArgReg; 855 switch(Op.getOperand(1).getValueType()) { 856 default: assert(0 && "Unknown type to return!"); 857 case MVT::i32: ArgReg = SP::I0; break; 858 case MVT::f32: ArgReg = SP::F0; break; 859 case MVT::f64: ArgReg = SP::D0; break; 860 } 861 Copy = DAG.getCopyToReg(Op.getOperand(0), ArgReg, Op.getOperand(1), 862 SDOperand()); 863 break; 864 } 865 case 5: 866 Copy = DAG.getCopyToReg(Op.getOperand(0), SP::I0, Op.getOperand(3), 867 SDOperand()); 868 Copy = DAG.getCopyToReg(Copy, SP::I1, Op.getOperand(1), Copy.getValue(1)); 869 break; 870 } 871 return DAG.getNode(SPISD::RET_FLAG, MVT::Other, Copy, Copy.getValue(1)); 872 } 873 // Frame & Return address. Currently unimplemented 874 case ISD::RETURNADDR: break; 875 case ISD::FRAMEADDR: break; 876 } 877 return SDOperand(); 878} 879 880MachineBasicBlock * 881SparcTargetLowering::InsertAtEndOfBasicBlock(MachineInstr *MI, 882 MachineBasicBlock *BB) { 883 const TargetInstrInfo &TII = *getTargetMachine().getInstrInfo(); 884 unsigned BROpcode; 885 unsigned CC; 886 // Figure out the conditional branch opcode to use for this select_cc. 887 switch (MI->getOpcode()) { 888 default: assert(0 && "Unknown SELECT_CC!"); 889 case SP::SELECT_CC_Int_ICC: 890 case SP::SELECT_CC_FP_ICC: 891 case SP::SELECT_CC_DFP_ICC: 892 BROpcode = SP::BCOND; 893 break; 894 case SP::SELECT_CC_Int_FCC: 895 case SP::SELECT_CC_FP_FCC: 896 case SP::SELECT_CC_DFP_FCC: 897 BROpcode = SP::FBCOND; 898 break; 899 } 900 901 CC = (SPCC::CondCodes)MI->getOperand(3).getImmedValue(); 902 903 // To "insert" a SELECT_CC instruction, we actually have to insert the diamond 904 // control-flow pattern. The incoming instruction knows the destination vreg 905 // to set, the condition code register to branch on, the true/false values to 906 // select between, and a branch opcode to use. 907 const BasicBlock *LLVM_BB = BB->getBasicBlock(); 908 ilist<MachineBasicBlock>::iterator It = BB; 909 ++It; 910 911 // thisMBB: 912 // ... 913 // TrueVal = ... 914 // [f]bCC copy1MBB 915 // fallthrough --> copy0MBB 916 MachineBasicBlock *thisMBB = BB; 917 MachineBasicBlock *copy0MBB = new MachineBasicBlock(LLVM_BB); 918 MachineBasicBlock *sinkMBB = new MachineBasicBlock(LLVM_BB); 919 BuildMI(BB, TII.get(BROpcode)).addMBB(sinkMBB).addImm(CC); 920 MachineFunction *F = BB->getParent(); 921 F->getBasicBlockList().insert(It, copy0MBB); 922 F->getBasicBlockList().insert(It, sinkMBB); 923 // Update machine-CFG edges by first adding all successors of the current 924 // block to the new block which will contain the Phi node for the select. 925 for(MachineBasicBlock::succ_iterator i = BB->succ_begin(), 926 e = BB->succ_end(); i != e; ++i) 927 sinkMBB->addSuccessor(*i); 928 // Next, remove all successors of the current block, and add the true 929 // and fallthrough blocks as its successors. 930 while(!BB->succ_empty()) 931 BB->removeSuccessor(BB->succ_begin()); 932 BB->addSuccessor(copy0MBB); 933 BB->addSuccessor(sinkMBB); 934 935 // copy0MBB: 936 // %FalseValue = ... 937 // # fallthrough to sinkMBB 938 BB = copy0MBB; 939 940 // Update machine-CFG edges 941 BB->addSuccessor(sinkMBB); 942 943 // sinkMBB: 944 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ] 945 // ... 946 BB = sinkMBB; 947 BuildMI(BB, TII.get(SP::PHI), MI->getOperand(0).getReg()) 948 .addReg(MI->getOperand(2).getReg()).addMBB(copy0MBB) 949 .addReg(MI->getOperand(1).getReg()).addMBB(thisMBB); 950 951 delete MI; // The pseudo instruction is gone now. 952 return BB; 953} 954 955//===----------------------------------------------------------------------===// 956// Instruction Selector Implementation 957//===----------------------------------------------------------------------===// 958 959//===--------------------------------------------------------------------===// 960/// SparcDAGToDAGISel - SPARC specific code to select SPARC machine 961/// instructions for SelectionDAG operations. 962/// 963namespace { 964class SparcDAGToDAGISel : public SelectionDAGISel { 965 SparcTargetLowering Lowering; 966 967 /// Subtarget - Keep a pointer to the Sparc Subtarget around so that we can 968 /// make the right decision when generating code for different targets. 969 const SparcSubtarget &Subtarget; 970public: 971 SparcDAGToDAGISel(TargetMachine &TM) 972 : SelectionDAGISel(Lowering), Lowering(TM), 973 Subtarget(TM.getSubtarget<SparcSubtarget>()) { 974 } 975 976 SDNode *Select(SDOperand Op); 977 978 // Complex Pattern Selectors. 979 bool SelectADDRrr(SDOperand Op, SDOperand N, SDOperand &R1, SDOperand &R2); 980 bool SelectADDRri(SDOperand Op, SDOperand N, SDOperand &Base, 981 SDOperand &Offset); 982 983 /// InstructionSelectBasicBlock - This callback is invoked by 984 /// SelectionDAGISel when it has created a SelectionDAG for us to codegen. 985 virtual void InstructionSelectBasicBlock(SelectionDAG &DAG); 986 987 virtual const char *getPassName() const { 988 return "SPARC DAG->DAG Pattern Instruction Selection"; 989 } 990 991 // Include the pieces autogenerated from the target description. 992#include "SparcGenDAGISel.inc" 993}; 994} // end anonymous namespace 995 996/// InstructionSelectBasicBlock - This callback is invoked by 997/// SelectionDAGISel when it has created a SelectionDAG for us to codegen. 998void SparcDAGToDAGISel::InstructionSelectBasicBlock(SelectionDAG &DAG) { 999 DEBUG(BB->dump()); 1000 1001 // Select target instructions for the DAG. 1002 DAG.setRoot(SelectRoot(DAG.getRoot())); 1003 DAG.RemoveDeadNodes(); 1004 1005 // Emit machine code to BB. 1006 ScheduleAndEmitDAG(DAG); 1007} 1008 1009bool SparcDAGToDAGISel::SelectADDRri(SDOperand Op, SDOperand Addr, 1010 SDOperand &Base, SDOperand &Offset) { 1011 if (FrameIndexSDNode *FIN = dyn_cast<FrameIndexSDNode>(Addr)) { 1012 Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), MVT::i32); 1013 Offset = CurDAG->getTargetConstant(0, MVT::i32); 1014 return true; 1015 } 1016 if (Addr.getOpcode() == ISD::TargetExternalSymbol || 1017 Addr.getOpcode() == ISD::TargetGlobalAddress) 1018 return false; // direct calls. 1019 1020 if (Addr.getOpcode() == ISD::ADD) { 1021 if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(Addr.getOperand(1))) { 1022 if (Predicate_simm13(CN)) { 1023 if (FrameIndexSDNode *FIN = 1024 dyn_cast<FrameIndexSDNode>(Addr.getOperand(0))) { 1025 // Constant offset from frame ref. 1026 Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), MVT::i32); 1027 } else { 1028 Base = Addr.getOperand(0); 1029 } 1030 Offset = CurDAG->getTargetConstant(CN->getValue(), MVT::i32); 1031 return true; 1032 } 1033 } 1034 if (Addr.getOperand(0).getOpcode() == SPISD::Lo) { 1035 Base = Addr.getOperand(1); 1036 Offset = Addr.getOperand(0).getOperand(0); 1037 return true; 1038 } 1039 if (Addr.getOperand(1).getOpcode() == SPISD::Lo) { 1040 Base = Addr.getOperand(0); 1041 Offset = Addr.getOperand(1).getOperand(0); 1042 return true; 1043 } 1044 } 1045 Base = Addr; 1046 Offset = CurDAG->getTargetConstant(0, MVT::i32); 1047 return true; 1048} 1049 1050bool SparcDAGToDAGISel::SelectADDRrr(SDOperand Op, SDOperand Addr, 1051 SDOperand &R1, SDOperand &R2) { 1052 if (Addr.getOpcode() == ISD::FrameIndex) return false; 1053 if (Addr.getOpcode() == ISD::TargetExternalSymbol || 1054 Addr.getOpcode() == ISD::TargetGlobalAddress) 1055 return false; // direct calls. 1056 1057 if (Addr.getOpcode() == ISD::ADD) { 1058 if (isa<ConstantSDNode>(Addr.getOperand(1)) && 1059 Predicate_simm13(Addr.getOperand(1).Val)) 1060 return false; // Let the reg+imm pattern catch this! 1061 if (Addr.getOperand(0).getOpcode() == SPISD::Lo || 1062 Addr.getOperand(1).getOpcode() == SPISD::Lo) 1063 return false; // Let the reg+imm pattern catch this! 1064 R1 = Addr.getOperand(0); 1065 R2 = Addr.getOperand(1); 1066 return true; 1067 } 1068 1069 R1 = Addr; 1070 R2 = CurDAG->getRegister(SP::G0, MVT::i32); 1071 return true; 1072} 1073 1074SDNode *SparcDAGToDAGISel::Select(SDOperand Op) { 1075 SDNode *N = Op.Val; 1076 if (N->getOpcode() >= ISD::BUILTIN_OP_END && 1077 N->getOpcode() < SPISD::FIRST_NUMBER) 1078 return NULL; // Already selected. 1079 1080 switch (N->getOpcode()) { 1081 default: break; 1082 case ISD::SDIV: 1083 case ISD::UDIV: { 1084 // FIXME: should use a custom expander to expose the SRA to the dag. 1085 SDOperand DivLHS = N->getOperand(0); 1086 SDOperand DivRHS = N->getOperand(1); 1087 AddToISelQueue(DivLHS); 1088 AddToISelQueue(DivRHS); 1089 1090 // Set the Y register to the high-part. 1091 SDOperand TopPart; 1092 if (N->getOpcode() == ISD::SDIV) { 1093 TopPart = SDOperand(CurDAG->getTargetNode(SP::SRAri, MVT::i32, DivLHS, 1094 CurDAG->getTargetConstant(31, MVT::i32)), 0); 1095 } else { 1096 TopPart = CurDAG->getRegister(SP::G0, MVT::i32); 1097 } 1098 TopPart = SDOperand(CurDAG->getTargetNode(SP::WRYrr, MVT::Flag, TopPart, 1099 CurDAG->getRegister(SP::G0, MVT::i32)), 0); 1100 1101 // FIXME: Handle div by immediate. 1102 unsigned Opcode = N->getOpcode() == ISD::SDIV ? SP::SDIVrr : SP::UDIVrr; 1103 return CurDAG->SelectNodeTo(N, Opcode, MVT::i32, DivLHS, DivRHS, 1104 TopPart); 1105 } 1106 case ISD::MULHU: 1107 case ISD::MULHS: { 1108 // FIXME: Handle mul by immediate. 1109 SDOperand MulLHS = N->getOperand(0); 1110 SDOperand MulRHS = N->getOperand(1); 1111 AddToISelQueue(MulLHS); 1112 AddToISelQueue(MulRHS); 1113 unsigned Opcode = N->getOpcode() == ISD::MULHU ? SP::UMULrr : SP::SMULrr; 1114 SDNode *Mul = CurDAG->getTargetNode(Opcode, MVT::i32, MVT::Flag, 1115 MulLHS, MulRHS); 1116 // The high part is in the Y register. 1117 return CurDAG->SelectNodeTo(N, SP::RDY, MVT::i32, SDOperand(Mul, 1)); 1118 return NULL; 1119 } 1120 } 1121 1122 return SelectCode(Op); 1123} 1124 1125 1126/// createSparcISelDag - This pass converts a legalized DAG into a 1127/// SPARC-specific DAG, ready for instruction scheduling. 1128/// 1129FunctionPass *llvm::createSparcISelDag(TargetMachine &TM) { 1130 return new SparcDAGToDAGISel(TM); 1131} 1132