SparcISelDAGToDAG.cpp revision f5da13367f88f06e3b585dc2263ab6e9ca6c4bf8
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 isVarArg, 121 unsigned CC, 122 bool isTailCall, SDOperand Callee, ArgListTy &Args, 123 SelectionDAG &DAG); 124 virtual MachineBasicBlock *InsertAtEndOfBasicBlock(MachineInstr *MI, 125 MachineBasicBlock *MBB); 126 127 virtual const char *getTargetNodeName(unsigned Opcode) const; 128 }; 129} 130 131SparcTargetLowering::SparcTargetLowering(TargetMachine &TM) 132 : TargetLowering(TM) { 133 134 // Set up the register classes. 135 addRegisterClass(MVT::i32, SP::IntRegsRegisterClass); 136 addRegisterClass(MVT::f32, SP::FPRegsRegisterClass); 137 addRegisterClass(MVT::f64, SP::DFPRegsRegisterClass); 138 139 // Turn FP extload into load/fextend 140 setLoadXAction(ISD::EXTLOAD, MVT::f32, Expand); 141 142 // Custom legalize GlobalAddress nodes into LO/HI parts. 143 setOperationAction(ISD::GlobalAddress, MVT::i32, Custom); 144 setOperationAction(ISD::ConstantPool , MVT::i32, Custom); 145 146 // Sparc doesn't have sext_inreg, replace them with shl/sra 147 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i16, Expand); 148 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i8 , Expand); 149 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1 , Expand); 150 151 // Sparc has no REM operation. 152 setOperationAction(ISD::UREM, MVT::i32, Expand); 153 setOperationAction(ISD::SREM, MVT::i32, Expand); 154 155 // Custom expand fp<->sint 156 setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom); 157 setOperationAction(ISD::SINT_TO_FP, MVT::i32, Custom); 158 159 // Expand fp<->uint 160 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Expand); 161 setOperationAction(ISD::UINT_TO_FP, MVT::i32, Expand); 162 163 setOperationAction(ISD::BIT_CONVERT, MVT::f32, Expand); 164 setOperationAction(ISD::BIT_CONVERT, MVT::i32, Expand); 165 166 // Sparc has no select or setcc: expand to SELECT_CC. 167 setOperationAction(ISD::SELECT, MVT::i32, Expand); 168 setOperationAction(ISD::SELECT, MVT::f32, Expand); 169 setOperationAction(ISD::SELECT, MVT::f64, Expand); 170 setOperationAction(ISD::SETCC, MVT::i32, Expand); 171 setOperationAction(ISD::SETCC, MVT::f32, Expand); 172 setOperationAction(ISD::SETCC, MVT::f64, Expand); 173 174 // Sparc doesn't have BRCOND either, it has BR_CC. 175 setOperationAction(ISD::BRCOND, MVT::Other, Expand); 176 setOperationAction(ISD::BRIND, MVT::Other, Expand); 177 setOperationAction(ISD::BR_JT, MVT::Other, Expand); 178 setOperationAction(ISD::BR_CC, MVT::i32, Custom); 179 setOperationAction(ISD::BR_CC, MVT::f32, Custom); 180 setOperationAction(ISD::BR_CC, MVT::f64, Custom); 181 182 setOperationAction(ISD::SELECT_CC, MVT::i32, Custom); 183 setOperationAction(ISD::SELECT_CC, MVT::f32, Custom); 184 setOperationAction(ISD::SELECT_CC, MVT::f64, Custom); 185 186 // SPARC has no intrinsics for these particular operations. 187 setOperationAction(ISD::MEMMOVE, MVT::Other, Expand); 188 setOperationAction(ISD::MEMSET, MVT::Other, Expand); 189 setOperationAction(ISD::MEMCPY, MVT::Other, Expand); 190 191 setOperationAction(ISD::FSIN , MVT::f64, Expand); 192 setOperationAction(ISD::FCOS , MVT::f64, Expand); 193 setOperationAction(ISD::FSIN , MVT::f32, Expand); 194 setOperationAction(ISD::FCOS , MVT::f32, Expand); 195 setOperationAction(ISD::CTPOP, MVT::i32, Expand); 196 setOperationAction(ISD::CTTZ , MVT::i32, Expand); 197 setOperationAction(ISD::CTLZ , MVT::i32, Expand); 198 setOperationAction(ISD::ROTL , MVT::i32, Expand); 199 setOperationAction(ISD::ROTR , MVT::i32, Expand); 200 setOperationAction(ISD::BSWAP, MVT::i32, Expand); 201 setOperationAction(ISD::FCOPYSIGN, MVT::f64, Expand); 202 setOperationAction(ISD::FCOPYSIGN, MVT::f32, Expand); 203 204 setOperationAction(ISD::SHL_PARTS, MVT::i32, Expand); 205 setOperationAction(ISD::SRA_PARTS, MVT::i32, Expand); 206 setOperationAction(ISD::SRL_PARTS, MVT::i32, Expand); 207 208 // We don't have line number support yet. 209 setOperationAction(ISD::LOCATION, MVT::Other, Expand); 210 setOperationAction(ISD::DEBUG_LOC, MVT::Other, Expand); 211 setOperationAction(ISD::DEBUG_LABEL, MVT::Other, Expand); 212 213 // RET must be custom lowered, to meet ABI requirements 214 setOperationAction(ISD::RET , MVT::Other, Custom); 215 216 // VASTART needs to be custom lowered to use the VarArgsFrameIndex. 217 setOperationAction(ISD::VASTART , MVT::Other, Custom); 218 // VAARG needs to be lowered to not do unaligned accesses for doubles. 219 setOperationAction(ISD::VAARG , MVT::Other, Custom); 220 221 // Use the default implementation. 222 setOperationAction(ISD::VACOPY , MVT::Other, Expand); 223 setOperationAction(ISD::VAEND , MVT::Other, Expand); 224 setOperationAction(ISD::STACKSAVE , MVT::Other, Expand); 225 setOperationAction(ISD::STACKRESTORE , MVT::Other, Expand); 226 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32 , Custom); 227 228 setOperationAction(ISD::ConstantFP, MVT::f64, Expand); 229 setOperationAction(ISD::ConstantFP, MVT::f32, Expand); 230 231 setStackPointerRegisterToSaveRestore(SP::O6); 232 233 if (TM.getSubtarget<SparcSubtarget>().isV9()) { 234 setOperationAction(ISD::CTPOP, MVT::i32, Legal); 235 } 236 237 computeRegisterProperties(); 238} 239 240const char *SparcTargetLowering::getTargetNodeName(unsigned Opcode) const { 241 switch (Opcode) { 242 default: return 0; 243 case SPISD::CMPICC: return "SPISD::CMPICC"; 244 case SPISD::CMPFCC: return "SPISD::CMPFCC"; 245 case SPISD::BRICC: return "SPISD::BRICC"; 246 case SPISD::BRFCC: return "SPISD::BRFCC"; 247 case SPISD::SELECT_ICC: return "SPISD::SELECT_ICC"; 248 case SPISD::SELECT_FCC: return "SPISD::SELECT_FCC"; 249 case SPISD::Hi: return "SPISD::Hi"; 250 case SPISD::Lo: return "SPISD::Lo"; 251 case SPISD::FTOI: return "SPISD::FTOI"; 252 case SPISD::ITOF: return "SPISD::ITOF"; 253 case SPISD::CALL: return "SPISD::CALL"; 254 case SPISD::RET_FLAG: return "SPISD::RET_FLAG"; 255 } 256} 257 258/// isMaskedValueZeroForTargetNode - Return true if 'Op & Mask' is known to 259/// be zero. Op is expected to be a target specific node. Used by DAG 260/// combiner. 261void SparcTargetLowering::computeMaskedBitsForTargetNode(const SDOperand Op, 262 uint64_t Mask, 263 uint64_t &KnownZero, 264 uint64_t &KnownOne, 265 unsigned Depth) const { 266 uint64_t KnownZero2, KnownOne2; 267 KnownZero = KnownOne = 0; // Don't know anything. 268 269 switch (Op.getOpcode()) { 270 default: break; 271 case SPISD::SELECT_ICC: 272 case SPISD::SELECT_FCC: 273 ComputeMaskedBits(Op.getOperand(1), Mask, KnownZero, KnownOne, Depth+1); 274 ComputeMaskedBits(Op.getOperand(0), Mask, KnownZero2, KnownOne2, Depth+1); 275 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?"); 276 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?"); 277 278 // Only known if known in both the LHS and RHS. 279 KnownOne &= KnownOne2; 280 KnownZero &= KnownZero2; 281 break; 282 } 283} 284 285/// LowerArguments - V8 uses a very simple ABI, where all values are passed in 286/// either one or two GPRs, including FP values. TODO: we should pass FP values 287/// in FP registers for fastcc functions. 288std::vector<SDOperand> 289SparcTargetLowering::LowerArguments(Function &F, SelectionDAG &DAG) { 290 MachineFunction &MF = DAG.getMachineFunction(); 291 SSARegMap *RegMap = MF.getSSARegMap(); 292 std::vector<SDOperand> ArgValues; 293 294 static const unsigned ArgRegs[] = { 295 SP::I0, SP::I1, SP::I2, SP::I3, SP::I4, SP::I5 296 }; 297 298 const unsigned *CurArgReg = ArgRegs, *ArgRegEnd = ArgRegs+6; 299 unsigned ArgOffset = 68; 300 301 SDOperand Root = DAG.getRoot(); 302 std::vector<SDOperand> OutChains; 303 304 for (Function::arg_iterator I = F.arg_begin(), E = F.arg_end(); I != E; ++I) { 305 MVT::ValueType ObjectVT = getValueType(I->getType()); 306 307 switch (ObjectVT) { 308 default: assert(0 && "Unhandled argument type!"); 309 case MVT::i1: 310 case MVT::i8: 311 case MVT::i16: 312 case MVT::i32: 313 if (I->use_empty()) { // Argument is dead. 314 if (CurArgReg < ArgRegEnd) ++CurArgReg; 315 ArgValues.push_back(DAG.getNode(ISD::UNDEF, ObjectVT)); 316 } else if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR 317 unsigned VReg = RegMap->createVirtualRegister(&SP::IntRegsRegClass); 318 MF.addLiveIn(*CurArgReg++, VReg); 319 SDOperand Arg = DAG.getCopyFromReg(Root, VReg, MVT::i32); 320 if (ObjectVT != MVT::i32) { 321 unsigned AssertOp = I->getType()->isSigned() ? ISD::AssertSext 322 : ISD::AssertZext; 323 Arg = DAG.getNode(AssertOp, MVT::i32, Arg, 324 DAG.getValueType(ObjectVT)); 325 Arg = DAG.getNode(ISD::TRUNCATE, ObjectVT, Arg); 326 } 327 ArgValues.push_back(Arg); 328 } else { 329 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset); 330 SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32); 331 SDOperand Load; 332 if (ObjectVT == MVT::i32) { 333 Load = DAG.getLoad(MVT::i32, Root, FIPtr, NULL, 0); 334 } else { 335 ISD::LoadExtType LoadOp = 336 I->getType()->isSigned() ? ISD::SEXTLOAD : ISD::ZEXTLOAD; 337 338 // Sparc is big endian, so add an offset based on the ObjectVT. 339 unsigned Offset = 4-std::max(1U, MVT::getSizeInBits(ObjectVT)/8); 340 FIPtr = DAG.getNode(ISD::ADD, MVT::i32, FIPtr, 341 DAG.getConstant(Offset, MVT::i32)); 342 Load = DAG.getExtLoad(LoadOp, MVT::i32, Root, FIPtr, 343 NULL, 0, ObjectVT); 344 Load = DAG.getNode(ISD::TRUNCATE, ObjectVT, Load); 345 } 346 ArgValues.push_back(Load); 347 } 348 349 ArgOffset += 4; 350 break; 351 case MVT::f32: 352 if (I->use_empty()) { // Argument is dead. 353 if (CurArgReg < ArgRegEnd) ++CurArgReg; 354 ArgValues.push_back(DAG.getNode(ISD::UNDEF, ObjectVT)); 355 } else if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR 356 // FP value is passed in an integer register. 357 unsigned VReg = RegMap->createVirtualRegister(&SP::IntRegsRegClass); 358 MF.addLiveIn(*CurArgReg++, VReg); 359 SDOperand Arg = DAG.getCopyFromReg(Root, VReg, MVT::i32); 360 361 Arg = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, Arg); 362 ArgValues.push_back(Arg); 363 } else { 364 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset); 365 SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32); 366 SDOperand Load = DAG.getLoad(MVT::f32, Root, FIPtr, NULL, 0); 367 ArgValues.push_back(Load); 368 } 369 ArgOffset += 4; 370 break; 371 372 case MVT::i64: 373 case MVT::f64: 374 if (I->use_empty()) { // Argument is dead. 375 if (CurArgReg < ArgRegEnd) ++CurArgReg; 376 if (CurArgReg < ArgRegEnd) ++CurArgReg; 377 ArgValues.push_back(DAG.getNode(ISD::UNDEF, ObjectVT)); 378 } else if (/* FIXME: Apparently this isn't safe?? */ 379 0 && CurArgReg == ArgRegEnd && ObjectVT == MVT::f64 && 380 ((CurArgReg-ArgRegs) & 1) == 0) { 381 // If this is a double argument and the whole thing lives on the stack, 382 // and the argument is aligned, load the double straight from the stack. 383 // We can't do a load in cases like void foo([6ints], int,double), 384 // because the double wouldn't be aligned! 385 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(8, ArgOffset); 386 SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32); 387 ArgValues.push_back(DAG.getLoad(MVT::f64, Root, FIPtr, NULL, 0)); 388 } else { 389 SDOperand HiVal; 390 if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR 391 unsigned VRegHi = RegMap->createVirtualRegister(&SP::IntRegsRegClass); 392 MF.addLiveIn(*CurArgReg++, VRegHi); 393 HiVal = DAG.getCopyFromReg(Root, VRegHi, MVT::i32); 394 } else { 395 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset); 396 SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32); 397 HiVal = DAG.getLoad(MVT::i32, Root, FIPtr, NULL, 0); 398 } 399 400 SDOperand LoVal; 401 if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR 402 unsigned VRegLo = RegMap->createVirtualRegister(&SP::IntRegsRegClass); 403 MF.addLiveIn(*CurArgReg++, VRegLo); 404 LoVal = DAG.getCopyFromReg(Root, VRegLo, MVT::i32); 405 } else { 406 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset+4); 407 SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32); 408 LoVal = DAG.getLoad(MVT::i32, Root, FIPtr, NULL, 0); 409 } 410 411 // Compose the two halves together into an i64 unit. 412 SDOperand WholeValue = 413 DAG.getNode(ISD::BUILD_PAIR, MVT::i64, LoVal, HiVal); 414 415 // If we want a double, do a bit convert. 416 if (ObjectVT == MVT::f64) 417 WholeValue = DAG.getNode(ISD::BIT_CONVERT, MVT::f64, WholeValue); 418 419 ArgValues.push_back(WholeValue); 420 } 421 ArgOffset += 8; 422 break; 423 } 424 } 425 426 // Store remaining ArgRegs to the stack if this is a varargs function. 427 if (F.getFunctionType()->isVarArg()) { 428 // Remember the vararg offset for the va_start implementation. 429 VarArgsFrameOffset = ArgOffset; 430 431 for (; CurArgReg != ArgRegEnd; ++CurArgReg) { 432 unsigned VReg = RegMap->createVirtualRegister(&SP::IntRegsRegClass); 433 MF.addLiveIn(*CurArgReg, VReg); 434 SDOperand Arg = DAG.getCopyFromReg(DAG.getRoot(), VReg, MVT::i32); 435 436 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset); 437 SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32); 438 439 OutChains.push_back(DAG.getStore(DAG.getRoot(), Arg, FIPtr, NULL, 0)); 440 ArgOffset += 4; 441 } 442 } 443 444 if (!OutChains.empty()) 445 DAG.setRoot(DAG.getNode(ISD::TokenFactor, MVT::Other, 446 &OutChains[0], OutChains.size())); 447 448 // Finally, inform the code generator which regs we return values in. 449 switch (getValueType(F.getReturnType())) { 450 default: assert(0 && "Unknown type!"); 451 case MVT::isVoid: break; 452 case MVT::i1: 453 case MVT::i8: 454 case MVT::i16: 455 case MVT::i32: 456 MF.addLiveOut(SP::I0); 457 break; 458 case MVT::i64: 459 MF.addLiveOut(SP::I0); 460 MF.addLiveOut(SP::I1); 461 break; 462 case MVT::f32: 463 MF.addLiveOut(SP::F0); 464 break; 465 case MVT::f64: 466 MF.addLiveOut(SP::D0); 467 break; 468 } 469 470 return ArgValues; 471} 472 473std::pair<SDOperand, SDOperand> 474SparcTargetLowering::LowerCallTo(SDOperand Chain, const Type *RetTy, 475 bool isVarArg, unsigned CC, 476 bool isTailCall, SDOperand Callee, 477 ArgListTy &Args, SelectionDAG &DAG) { 478 // Count the size of the outgoing arguments. 479 unsigned ArgsSize = 0; 480 for (unsigned i = 0, e = Args.size(); i != e; ++i) { 481 switch (getValueType(Args[i].second)) { 482 default: assert(0 && "Unknown value type!"); 483 case MVT::i1: 484 case MVT::i8: 485 case MVT::i16: 486 case MVT::i32: 487 case MVT::f32: 488 ArgsSize += 4; 489 break; 490 case MVT::i64: 491 case MVT::f64: 492 ArgsSize += 8; 493 break; 494 } 495 } 496 if (ArgsSize > 4*6) 497 ArgsSize -= 4*6; // Space for first 6 arguments is prereserved. 498 else 499 ArgsSize = 0; 500 501 // Keep stack frames 8-byte aligned. 502 ArgsSize = (ArgsSize+7) & ~7; 503 504 Chain = DAG.getCALLSEQ_START(Chain,DAG.getConstant(ArgsSize, getPointerTy())); 505 506 SDOperand StackPtr; 507 std::vector<SDOperand> Stores; 508 std::vector<SDOperand> RegValuesToPass; 509 unsigned ArgOffset = 68; 510 for (unsigned i = 0, e = Args.size(); i != e; ++i) { 511 SDOperand Val = Args[i].first; 512 MVT::ValueType ObjectVT = Val.getValueType(); 513 SDOperand ValToStore(0, 0); 514 unsigned ObjSize; 515 switch (ObjectVT) { 516 default: assert(0 && "Unhandled argument type!"); 517 case MVT::i1: 518 case MVT::i8: 519 case MVT::i16: 520 // Promote the integer to 32-bits. If the input type is signed, use a 521 // sign extend, otherwise use a zero extend. 522 if (Args[i].second->isSigned()) 523 Val = DAG.getNode(ISD::SIGN_EXTEND, MVT::i32, Val); 524 else 525 Val = DAG.getNode(ISD::ZERO_EXTEND, MVT::i32, Val); 526 // FALL THROUGH 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 RetVal = DAG.getNode(RetTy->isSigned() ? ISD::AssertSext :ISD::AssertZext, 638 MVT::i32, RetVal, DAG.getValueType(RetTyVT)); 639 RetVal = DAG.getNode(ISD::TRUNCATE, RetTyVT, RetVal); 640 break; 641 case MVT::i32: 642 RetVal = DAG.getCopyFromReg(Chain, SP::O0, MVT::i32, InFlag); 643 Chain = RetVal.getValue(1); 644 break; 645 case MVT::f32: 646 RetVal = DAG.getCopyFromReg(Chain, SP::F0, MVT::f32, InFlag); 647 Chain = RetVal.getValue(1); 648 break; 649 case MVT::f64: 650 RetVal = DAG.getCopyFromReg(Chain, SP::D0, MVT::f64, InFlag); 651 Chain = RetVal.getValue(1); 652 break; 653 case MVT::i64: 654 SDOperand Lo = DAG.getCopyFromReg(Chain, SP::O1, MVT::i32, InFlag); 655 SDOperand Hi = DAG.getCopyFromReg(Lo.getValue(1), SP::O0, MVT::i32, 656 Lo.getValue(2)); 657 RetVal = DAG.getNode(ISD::BUILD_PAIR, MVT::i64, Lo, Hi); 658 Chain = Hi.getValue(1); 659 break; 660 } 661 } 662 663 Chain = DAG.getNode(ISD::CALLSEQ_END, MVT::Other, Chain, 664 DAG.getConstant(ArgsSize, getPointerTy())); 665 666 return std::make_pair(RetVal, Chain); 667} 668 669// Look at LHS/RHS/CC and see if they are a lowered setcc instruction. If so 670// set LHS/RHS and SPCC to the LHS/RHS of the setcc and SPCC to the condition. 671static void LookThroughSetCC(SDOperand &LHS, SDOperand &RHS, 672 ISD::CondCode CC, unsigned &SPCC) { 673 if (isa<ConstantSDNode>(RHS) && cast<ConstantSDNode>(RHS)->getValue() == 0 && 674 CC == ISD::SETNE && 675 ((LHS.getOpcode() == SPISD::SELECT_ICC && 676 LHS.getOperand(3).getOpcode() == SPISD::CMPICC) || 677 (LHS.getOpcode() == SPISD::SELECT_FCC && 678 LHS.getOperand(3).getOpcode() == SPISD::CMPFCC)) && 679 isa<ConstantSDNode>(LHS.getOperand(0)) && 680 isa<ConstantSDNode>(LHS.getOperand(1)) && 681 cast<ConstantSDNode>(LHS.getOperand(0))->getValue() == 1 && 682 cast<ConstantSDNode>(LHS.getOperand(1))->getValue() == 0) { 683 SDOperand CMPCC = LHS.getOperand(3); 684 SPCC = cast<ConstantSDNode>(LHS.getOperand(2))->getValue(); 685 LHS = CMPCC.getOperand(0); 686 RHS = CMPCC.getOperand(1); 687 } 688} 689 690 691SDOperand SparcTargetLowering:: 692LowerOperation(SDOperand Op, SelectionDAG &DAG) { 693 switch (Op.getOpcode()) { 694 default: assert(0 && "Should not custom lower this!"); 695 case ISD::GlobalAddress: { 696 GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal(); 697 SDOperand GA = DAG.getTargetGlobalAddress(GV, MVT::i32); 698 SDOperand Hi = DAG.getNode(SPISD::Hi, MVT::i32, GA); 699 SDOperand Lo = DAG.getNode(SPISD::Lo, MVT::i32, GA); 700 return DAG.getNode(ISD::ADD, MVT::i32, Lo, Hi); 701 } 702 case ISD::ConstantPool: { 703 Constant *C = cast<ConstantPoolSDNode>(Op)->getConstVal(); 704 SDOperand CP = DAG.getTargetConstantPool(C, MVT::i32, 705 cast<ConstantPoolSDNode>(Op)->getAlignment()); 706 SDOperand Hi = DAG.getNode(SPISD::Hi, MVT::i32, CP); 707 SDOperand Lo = DAG.getNode(SPISD::Lo, MVT::i32, CP); 708 return DAG.getNode(ISD::ADD, MVT::i32, Lo, Hi); 709 } 710 case ISD::FP_TO_SINT: 711 // Convert the fp value to integer in an FP register. 712 assert(Op.getValueType() == MVT::i32); 713 Op = DAG.getNode(SPISD::FTOI, MVT::f32, Op.getOperand(0)); 714 return DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Op); 715 case ISD::SINT_TO_FP: { 716 assert(Op.getOperand(0).getValueType() == MVT::i32); 717 SDOperand Tmp = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, Op.getOperand(0)); 718 // Convert the int value to FP in an FP register. 719 return DAG.getNode(SPISD::ITOF, Op.getValueType(), Tmp); 720 } 721 case ISD::BR_CC: { 722 SDOperand Chain = Op.getOperand(0); 723 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get(); 724 SDOperand LHS = Op.getOperand(2); 725 SDOperand RHS = Op.getOperand(3); 726 SDOperand Dest = Op.getOperand(4); 727 unsigned Opc, SPCC = ~0U; 728 729 // If this is a br_cc of a "setcc", and if the setcc got lowered into 730 // an CMP[IF]CC/SELECT_[IF]CC pair, find the original compared values. 731 LookThroughSetCC(LHS, RHS, CC, SPCC); 732 733 // Get the condition flag. 734 SDOperand CompareFlag; 735 if (LHS.getValueType() == MVT::i32) { 736 std::vector<MVT::ValueType> VTs; 737 VTs.push_back(MVT::i32); 738 VTs.push_back(MVT::Flag); 739 SDOperand Ops[2] = { LHS, RHS }; 740 CompareFlag = DAG.getNode(SPISD::CMPICC, VTs, Ops, 2).getValue(1); 741 if (SPCC == ~0U) SPCC = IntCondCCodeToICC(CC); 742 Opc = SPISD::BRICC; 743 } else { 744 CompareFlag = DAG.getNode(SPISD::CMPFCC, MVT::Flag, LHS, RHS); 745 if (SPCC == ~0U) SPCC = FPCondCCodeToFCC(CC); 746 Opc = SPISD::BRFCC; 747 } 748 return DAG.getNode(Opc, MVT::Other, Chain, Dest, 749 DAG.getConstant(SPCC, MVT::i32), CompareFlag); 750 } 751 case ISD::SELECT_CC: { 752 SDOperand LHS = Op.getOperand(0); 753 SDOperand RHS = Op.getOperand(1); 754 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get(); 755 SDOperand TrueVal = Op.getOperand(2); 756 SDOperand FalseVal = Op.getOperand(3); 757 unsigned Opc, SPCC = ~0U; 758 759 // If this is a select_cc of a "setcc", and if the setcc got lowered into 760 // an CMP[IF]CC/SELECT_[IF]CC pair, find the original compared values. 761 LookThroughSetCC(LHS, RHS, CC, SPCC); 762 763 SDOperand CompareFlag; 764 if (LHS.getValueType() == MVT::i32) { 765 std::vector<MVT::ValueType> VTs; 766 VTs.push_back(LHS.getValueType()); // subcc returns a value 767 VTs.push_back(MVT::Flag); 768 SDOperand Ops[2] = { LHS, RHS }; 769 CompareFlag = DAG.getNode(SPISD::CMPICC, VTs, Ops, 2).getValue(1); 770 Opc = SPISD::SELECT_ICC; 771 if (SPCC == ~0U) SPCC = IntCondCCodeToICC(CC); 772 } else { 773 CompareFlag = DAG.getNode(SPISD::CMPFCC, MVT::Flag, LHS, RHS); 774 Opc = SPISD::SELECT_FCC; 775 if (SPCC == ~0U) SPCC = FPCondCCodeToFCC(CC); 776 } 777 return DAG.getNode(Opc, TrueVal.getValueType(), TrueVal, FalseVal, 778 DAG.getConstant(SPCC, MVT::i32), CompareFlag); 779 } 780 case ISD::VASTART: { 781 // vastart just stores the address of the VarArgsFrameIndex slot into the 782 // memory location argument. 783 SDOperand Offset = DAG.getNode(ISD::ADD, MVT::i32, 784 DAG.getRegister(SP::I6, MVT::i32), 785 DAG.getConstant(VarArgsFrameOffset, MVT::i32)); 786 SrcValueSDNode *SV = cast<SrcValueSDNode>(Op.getOperand(2)); 787 return DAG.getStore(Op.getOperand(0), Offset, 788 Op.getOperand(1), SV->getValue(), SV->getOffset()); 789 } 790 case ISD::VAARG: { 791 SDNode *Node = Op.Val; 792 MVT::ValueType VT = Node->getValueType(0); 793 SDOperand InChain = Node->getOperand(0); 794 SDOperand VAListPtr = Node->getOperand(1); 795 SrcValueSDNode *SV = cast<SrcValueSDNode>(Node->getOperand(2)); 796 SDOperand VAList = DAG.getLoad(getPointerTy(), InChain, VAListPtr, 797 SV->getValue(), SV->getOffset()); 798 // Increment the pointer, VAList, to the next vaarg 799 SDOperand NextPtr = DAG.getNode(ISD::ADD, getPointerTy(), VAList, 800 DAG.getConstant(MVT::getSizeInBits(VT)/8, 801 getPointerTy())); 802 // Store the incremented VAList to the legalized pointer 803 InChain = DAG.getStore(VAList.getValue(1), NextPtr, 804 VAListPtr, SV->getValue(), SV->getOffset()); 805 // Load the actual argument out of the pointer VAList, unless this is an 806 // f64 load. 807 if (VT != MVT::f64) { 808 return DAG.getLoad(VT, InChain, VAList, NULL, 0); 809 } else { 810 // Otherwise, load it as i64, then do a bitconvert. 811 SDOperand V = DAG.getLoad(MVT::i64, InChain, VAList, NULL, 0); 812 std::vector<MVT::ValueType> Tys; 813 Tys.push_back(MVT::f64); 814 Tys.push_back(MVT::Other); 815 // Bit-Convert the value to f64. 816 SDOperand Ops[2] = { DAG.getNode(ISD::BIT_CONVERT, MVT::f64, V), 817 V.getValue(1) }; 818 return DAG.getNode(ISD::MERGE_VALUES, Tys, Ops, 2); 819 } 820 } 821 case ISD::DYNAMIC_STACKALLOC: { 822 SDOperand Chain = Op.getOperand(0); // Legalize the chain. 823 SDOperand Size = Op.getOperand(1); // Legalize the size. 824 825 unsigned SPReg = SP::O6; 826 SDOperand SP = DAG.getCopyFromReg(Chain, SPReg, MVT::i32); 827 SDOperand NewSP = DAG.getNode(ISD::SUB, MVT::i32, SP, Size); // Value 828 Chain = DAG.getCopyToReg(SP.getValue(1), SPReg, NewSP); // Output chain 829 830 // The resultant pointer is actually 16 words from the bottom of the stack, 831 // to provide a register spill area. 832 SDOperand NewVal = DAG.getNode(ISD::ADD, MVT::i32, NewSP, 833 DAG.getConstant(96, MVT::i32)); 834 std::vector<MVT::ValueType> Tys; 835 Tys.push_back(MVT::i32); 836 Tys.push_back(MVT::Other); 837 SDOperand Ops[2] = { NewVal, Chain }; 838 return DAG.getNode(ISD::MERGE_VALUES, Tys, Ops, 2); 839 } 840 case ISD::RET: { 841 SDOperand Copy; 842 843 switch(Op.getNumOperands()) { 844 default: 845 assert(0 && "Do not know how to return this many arguments!"); 846 abort(); 847 case 1: 848 return SDOperand(); // ret void is legal 849 case 3: { 850 unsigned ArgReg; 851 switch(Op.getOperand(1).getValueType()) { 852 default: assert(0 && "Unknown type to return!"); 853 case MVT::i32: ArgReg = SP::I0; break; 854 case MVT::f32: ArgReg = SP::F0; break; 855 case MVT::f64: ArgReg = SP::D0; break; 856 } 857 Copy = DAG.getCopyToReg(Op.getOperand(0), ArgReg, Op.getOperand(1), 858 SDOperand()); 859 break; 860 } 861 case 5: 862 Copy = DAG.getCopyToReg(Op.getOperand(0), SP::I0, Op.getOperand(3), 863 SDOperand()); 864 Copy = DAG.getCopyToReg(Copy, SP::I1, Op.getOperand(1), Copy.getValue(1)); 865 break; 866 } 867 return DAG.getNode(SPISD::RET_FLAG, MVT::Other, Copy, Copy.getValue(1)); 868 } 869 } 870} 871 872MachineBasicBlock * 873SparcTargetLowering::InsertAtEndOfBasicBlock(MachineInstr *MI, 874 MachineBasicBlock *BB) { 875 const TargetInstrInfo &TII = *getTargetMachine().getInstrInfo(); 876 unsigned BROpcode; 877 unsigned CC; 878 // Figure out the conditional branch opcode to use for this select_cc. 879 switch (MI->getOpcode()) { 880 default: assert(0 && "Unknown SELECT_CC!"); 881 case SP::SELECT_CC_Int_ICC: 882 case SP::SELECT_CC_FP_ICC: 883 case SP::SELECT_CC_DFP_ICC: 884 BROpcode = SP::BCOND; 885 break; 886 case SP::SELECT_CC_Int_FCC: 887 case SP::SELECT_CC_FP_FCC: 888 case SP::SELECT_CC_DFP_FCC: 889 BROpcode = SP::FBCOND; 890 break; 891 } 892 893 CC = (SPCC::CondCodes)MI->getOperand(3).getImmedValue(); 894 895 // To "insert" a SELECT_CC instruction, we actually have to insert the diamond 896 // control-flow pattern. The incoming instruction knows the destination vreg 897 // to set, the condition code register to branch on, the true/false values to 898 // select between, and a branch opcode to use. 899 const BasicBlock *LLVM_BB = BB->getBasicBlock(); 900 ilist<MachineBasicBlock>::iterator It = BB; 901 ++It; 902 903 // thisMBB: 904 // ... 905 // TrueVal = ... 906 // [f]bCC copy1MBB 907 // fallthrough --> copy0MBB 908 MachineBasicBlock *thisMBB = BB; 909 MachineBasicBlock *copy0MBB = new MachineBasicBlock(LLVM_BB); 910 MachineBasicBlock *sinkMBB = new MachineBasicBlock(LLVM_BB); 911 BuildMI(BB, TII.get(BROpcode)).addMBB(sinkMBB).addImm(CC); 912 MachineFunction *F = BB->getParent(); 913 F->getBasicBlockList().insert(It, copy0MBB); 914 F->getBasicBlockList().insert(It, sinkMBB); 915 // Update machine-CFG edges by first adding all successors of the current 916 // block to the new block which will contain the Phi node for the select. 917 for(MachineBasicBlock::succ_iterator i = BB->succ_begin(), 918 e = BB->succ_end(); i != e; ++i) 919 sinkMBB->addSuccessor(*i); 920 // Next, remove all successors of the current block, and add the true 921 // and fallthrough blocks as its successors. 922 while(!BB->succ_empty()) 923 BB->removeSuccessor(BB->succ_begin()); 924 BB->addSuccessor(copy0MBB); 925 BB->addSuccessor(sinkMBB); 926 927 // copy0MBB: 928 // %FalseValue = ... 929 // # fallthrough to sinkMBB 930 BB = copy0MBB; 931 932 // Update machine-CFG edges 933 BB->addSuccessor(sinkMBB); 934 935 // sinkMBB: 936 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ] 937 // ... 938 BB = sinkMBB; 939 BuildMI(BB, TII.get(SP::PHI), MI->getOperand(0).getReg()) 940 .addReg(MI->getOperand(2).getReg()).addMBB(copy0MBB) 941 .addReg(MI->getOperand(1).getReg()).addMBB(thisMBB); 942 943 delete MI; // The pseudo instruction is gone now. 944 return BB; 945} 946 947//===----------------------------------------------------------------------===// 948// Instruction Selector Implementation 949//===----------------------------------------------------------------------===// 950 951//===--------------------------------------------------------------------===// 952/// SparcDAGToDAGISel - SPARC specific code to select SPARC machine 953/// instructions for SelectionDAG operations. 954/// 955namespace { 956class SparcDAGToDAGISel : public SelectionDAGISel { 957 SparcTargetLowering Lowering; 958 959 /// Subtarget - Keep a pointer to the Sparc Subtarget around so that we can 960 /// make the right decision when generating code for different targets. 961 const SparcSubtarget &Subtarget; 962public: 963 SparcDAGToDAGISel(TargetMachine &TM) 964 : SelectionDAGISel(Lowering), Lowering(TM), 965 Subtarget(TM.getSubtarget<SparcSubtarget>()) { 966 } 967 968 SDNode *Select(SDOperand Op); 969 970 // Complex Pattern Selectors. 971 bool SelectADDRrr(SDOperand Op, SDOperand N, SDOperand &R1, SDOperand &R2); 972 bool SelectADDRri(SDOperand Op, SDOperand N, SDOperand &Base, 973 SDOperand &Offset); 974 975 /// InstructionSelectBasicBlock - This callback is invoked by 976 /// SelectionDAGISel when it has created a SelectionDAG for us to codegen. 977 virtual void InstructionSelectBasicBlock(SelectionDAG &DAG); 978 979 virtual const char *getPassName() const { 980 return "SPARC DAG->DAG Pattern Instruction Selection"; 981 } 982 983 // Include the pieces autogenerated from the target description. 984#include "SparcGenDAGISel.inc" 985}; 986} // end anonymous namespace 987 988/// InstructionSelectBasicBlock - This callback is invoked by 989/// SelectionDAGISel when it has created a SelectionDAG for us to codegen. 990void SparcDAGToDAGISel::InstructionSelectBasicBlock(SelectionDAG &DAG) { 991 DEBUG(BB->dump()); 992 993 // Select target instructions for the DAG. 994 DAG.setRoot(SelectRoot(DAG.getRoot())); 995 DAG.RemoveDeadNodes(); 996 997 // Emit machine code to BB. 998 ScheduleAndEmitDAG(DAG); 999} 1000 1001bool SparcDAGToDAGISel::SelectADDRri(SDOperand Op, SDOperand Addr, 1002 SDOperand &Base, SDOperand &Offset) { 1003 if (FrameIndexSDNode *FIN = dyn_cast<FrameIndexSDNode>(Addr)) { 1004 Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), MVT::i32); 1005 Offset = CurDAG->getTargetConstant(0, MVT::i32); 1006 return true; 1007 } 1008 if (Addr.getOpcode() == ISD::TargetExternalSymbol || 1009 Addr.getOpcode() == ISD::TargetGlobalAddress) 1010 return false; // direct calls. 1011 1012 if (Addr.getOpcode() == ISD::ADD) { 1013 if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(Addr.getOperand(1))) { 1014 if (Predicate_simm13(CN)) { 1015 if (FrameIndexSDNode *FIN = 1016 dyn_cast<FrameIndexSDNode>(Addr.getOperand(0))) { 1017 // Constant offset from frame ref. 1018 Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), MVT::i32); 1019 } else { 1020 Base = Addr.getOperand(0); 1021 } 1022 Offset = CurDAG->getTargetConstant(CN->getValue(), MVT::i32); 1023 return true; 1024 } 1025 } 1026 if (Addr.getOperand(0).getOpcode() == SPISD::Lo) { 1027 Base = Addr.getOperand(1); 1028 Offset = Addr.getOperand(0).getOperand(0); 1029 return true; 1030 } 1031 if (Addr.getOperand(1).getOpcode() == SPISD::Lo) { 1032 Base = Addr.getOperand(0); 1033 Offset = Addr.getOperand(1).getOperand(0); 1034 return true; 1035 } 1036 } 1037 Base = Addr; 1038 Offset = CurDAG->getTargetConstant(0, MVT::i32); 1039 return true; 1040} 1041 1042bool SparcDAGToDAGISel::SelectADDRrr(SDOperand Op, SDOperand Addr, 1043 SDOperand &R1, SDOperand &R2) { 1044 if (Addr.getOpcode() == ISD::FrameIndex) return false; 1045 if (Addr.getOpcode() == ISD::TargetExternalSymbol || 1046 Addr.getOpcode() == ISD::TargetGlobalAddress) 1047 return false; // direct calls. 1048 1049 if (Addr.getOpcode() == ISD::ADD) { 1050 if (isa<ConstantSDNode>(Addr.getOperand(1)) && 1051 Predicate_simm13(Addr.getOperand(1).Val)) 1052 return false; // Let the reg+imm pattern catch this! 1053 if (Addr.getOperand(0).getOpcode() == SPISD::Lo || 1054 Addr.getOperand(1).getOpcode() == SPISD::Lo) 1055 return false; // Let the reg+imm pattern catch this! 1056 R1 = Addr.getOperand(0); 1057 R2 = Addr.getOperand(1); 1058 return true; 1059 } 1060 1061 R1 = Addr; 1062 R2 = CurDAG->getRegister(SP::G0, MVT::i32); 1063 return true; 1064} 1065 1066SDNode *SparcDAGToDAGISel::Select(SDOperand Op) { 1067 SDNode *N = Op.Val; 1068 if (N->getOpcode() >= ISD::BUILTIN_OP_END && 1069 N->getOpcode() < SPISD::FIRST_NUMBER) 1070 return NULL; // Already selected. 1071 1072 switch (N->getOpcode()) { 1073 default: break; 1074 case ISD::SDIV: 1075 case ISD::UDIV: { 1076 // FIXME: should use a custom expander to expose the SRA to the dag. 1077 SDOperand DivLHS = N->getOperand(0); 1078 SDOperand DivRHS = N->getOperand(1); 1079 AddToISelQueue(DivLHS); 1080 AddToISelQueue(DivRHS); 1081 1082 // Set the Y register to the high-part. 1083 SDOperand TopPart; 1084 if (N->getOpcode() == ISD::SDIV) { 1085 TopPart = SDOperand(CurDAG->getTargetNode(SP::SRAri, MVT::i32, DivLHS, 1086 CurDAG->getTargetConstant(31, MVT::i32)), 0); 1087 } else { 1088 TopPart = CurDAG->getRegister(SP::G0, MVT::i32); 1089 } 1090 TopPart = SDOperand(CurDAG->getTargetNode(SP::WRYrr, MVT::Flag, TopPart, 1091 CurDAG->getRegister(SP::G0, MVT::i32)), 0); 1092 1093 // FIXME: Handle div by immediate. 1094 unsigned Opcode = N->getOpcode() == ISD::SDIV ? SP::SDIVrr : SP::UDIVrr; 1095 return CurDAG->SelectNodeTo(N, Opcode, MVT::i32, DivLHS, DivRHS, 1096 TopPart); 1097 } 1098 case ISD::MULHU: 1099 case ISD::MULHS: { 1100 // FIXME: Handle mul by immediate. 1101 SDOperand MulLHS = N->getOperand(0); 1102 SDOperand MulRHS = N->getOperand(1); 1103 AddToISelQueue(MulLHS); 1104 AddToISelQueue(MulRHS); 1105 unsigned Opcode = N->getOpcode() == ISD::MULHU ? SP::UMULrr : SP::SMULrr; 1106 SDNode *Mul = CurDAG->getTargetNode(Opcode, MVT::i32, MVT::Flag, 1107 MulLHS, MulRHS); 1108 // The high part is in the Y register. 1109 return CurDAG->SelectNodeTo(N, SP::RDY, MVT::i32, SDOperand(Mul, 1)); 1110 return NULL; 1111 } 1112 } 1113 1114 return SelectCode(Op); 1115} 1116 1117 1118/// createSparcISelDag - This pass converts a legalized DAG into a 1119/// SPARC-specific DAG, ready for instruction scheduling. 1120/// 1121FunctionPass *llvm::createSparcISelDag(TargetMachine &TM) { 1122 return new SparcDAGToDAGISel(TM); 1123} 1124