1 //===-- SparcISelLowering.cpp - Sparc DAG Lowering Implementation ---------===// 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 file implements the interfaces that Sparc uses to lower LLVM code into a 11 // selection DAG. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #include "SparcISelLowering.h" 16 #include "SparcMachineFunctionInfo.h" 17 #include "SparcTargetMachine.h" 18 #include "llvm/CodeGen/CallingConvLower.h" 19 #include "llvm/CodeGen/MachineFrameInfo.h" 20 #include "llvm/CodeGen/MachineFunction.h" 21 #include "llvm/CodeGen/MachineInstrBuilder.h" 22 #include "llvm/CodeGen/MachineRegisterInfo.h" 23 #include "llvm/CodeGen/SelectionDAG.h" 24 #include "llvm/CodeGen/TargetLoweringObjectFileImpl.h" 25 #include "llvm/IR/DerivedTypes.h" 26 #include "llvm/IR/Function.h" 27 #include "llvm/IR/Module.h" 28 #include "llvm/Support/ErrorHandling.h" 29 using namespace llvm; 30 31 32 //===----------------------------------------------------------------------===// 33 // Calling Convention Implementation 34 //===----------------------------------------------------------------------===// 35 36 static bool CC_Sparc_Assign_SRet(unsigned &ValNo, MVT &ValVT, 37 MVT &LocVT, CCValAssign::LocInfo &LocInfo, 38 ISD::ArgFlagsTy &ArgFlags, CCState &State) 39 { 40 assert (ArgFlags.isSRet()); 41 42 //Assign SRet argument 43 State.addLoc(CCValAssign::getCustomMem(ValNo, ValVT, 44 0, 45 LocVT, LocInfo)); 46 return true; 47 } 48 49 static bool CC_Sparc_Assign_f64(unsigned &ValNo, MVT &ValVT, 50 MVT &LocVT, CCValAssign::LocInfo &LocInfo, 51 ISD::ArgFlagsTy &ArgFlags, CCState &State) 52 { 53 static const uint16_t RegList[] = { 54 SP::I0, SP::I1, SP::I2, SP::I3, SP::I4, SP::I5 55 }; 56 //Try to get first reg 57 if (unsigned Reg = State.AllocateReg(RegList, 6)) { 58 State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, Reg, LocVT, LocInfo)); 59 } else { 60 //Assign whole thing in stack 61 State.addLoc(CCValAssign::getCustomMem(ValNo, ValVT, 62 State.AllocateStack(8,4), 63 LocVT, LocInfo)); 64 return true; 65 } 66 67 //Try to get second reg 68 if (unsigned Reg = State.AllocateReg(RegList, 6)) 69 State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, Reg, LocVT, LocInfo)); 70 else 71 State.addLoc(CCValAssign::getCustomMem(ValNo, ValVT, 72 State.AllocateStack(4,4), 73 LocVT, LocInfo)); 74 return true; 75 } 76 77 #include "SparcGenCallingConv.inc" 78 79 SDValue 80 SparcTargetLowering::LowerReturn(SDValue Chain, 81 CallingConv::ID CallConv, bool isVarArg, 82 const SmallVectorImpl<ISD::OutputArg> &Outs, 83 const SmallVectorImpl<SDValue> &OutVals, 84 DebugLoc dl, SelectionDAG &DAG) const { 85 86 MachineFunction &MF = DAG.getMachineFunction(); 87 88 // CCValAssign - represent the assignment of the return value to locations. 89 SmallVector<CCValAssign, 16> RVLocs; 90 91 // CCState - Info about the registers and stack slot. 92 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(), 93 DAG.getTarget(), RVLocs, *DAG.getContext()); 94 95 // Analize return values. 96 CCInfo.AnalyzeReturn(Outs, RetCC_Sparc32); 97 98 SDValue Flag; 99 SmallVector<SDValue, 4> RetOps(1, Chain); 100 // Make room for the return address offset. 101 RetOps.push_back(SDValue()); 102 103 // Copy the result values into the output registers. 104 for (unsigned i = 0; i != RVLocs.size(); ++i) { 105 CCValAssign &VA = RVLocs[i]; 106 assert(VA.isRegLoc() && "Can only return in registers!"); 107 108 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), 109 OutVals[i], Flag); 110 111 // Guarantee that all emitted copies are stuck together with flags. 112 Flag = Chain.getValue(1); 113 RetOps.push_back(DAG.getRegister(VA.getLocReg(), VA.getLocVT())); 114 } 115 116 unsigned RetAddrOffset = 8; //Call Inst + Delay Slot 117 // If the function returns a struct, copy the SRetReturnReg to I0 118 if (MF.getFunction()->hasStructRetAttr()) { 119 SparcMachineFunctionInfo *SFI = MF.getInfo<SparcMachineFunctionInfo>(); 120 unsigned Reg = SFI->getSRetReturnReg(); 121 if (!Reg) 122 llvm_unreachable("sret virtual register not created in the entry block"); 123 SDValue Val = DAG.getCopyFromReg(Chain, dl, Reg, getPointerTy()); 124 Chain = DAG.getCopyToReg(Chain, dl, SP::I0, Val, Flag); 125 Flag = Chain.getValue(1); 126 RetOps.push_back(DAG.getRegister(SP::I0, getPointerTy())); 127 RetAddrOffset = 12; // CallInst + Delay Slot + Unimp 128 } 129 130 RetOps[0] = Chain; // Update chain. 131 RetOps[1] = DAG.getConstant(RetAddrOffset, MVT::i32); 132 133 // Add the flag if we have it. 134 if (Flag.getNode()) 135 RetOps.push_back(Flag); 136 137 return DAG.getNode(SPISD::RET_FLAG, dl, MVT::Other, 138 &RetOps[0], RetOps.size()); 139 } 140 141 /// LowerFormalArguments - V8 uses a very simple ABI, where all values are 142 /// passed in either one or two GPRs, including FP values. TODO: we should 143 /// pass FP values in FP registers for fastcc functions. 144 SDValue 145 SparcTargetLowering::LowerFormalArguments(SDValue Chain, 146 CallingConv::ID CallConv, bool isVarArg, 147 const SmallVectorImpl<ISD::InputArg> 148 &Ins, 149 DebugLoc dl, SelectionDAG &DAG, 150 SmallVectorImpl<SDValue> &InVals) 151 const { 152 153 MachineFunction &MF = DAG.getMachineFunction(); 154 MachineRegisterInfo &RegInfo = MF.getRegInfo(); 155 SparcMachineFunctionInfo *FuncInfo = MF.getInfo<SparcMachineFunctionInfo>(); 156 157 // Assign locations to all of the incoming arguments. 158 SmallVector<CCValAssign, 16> ArgLocs; 159 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(), 160 getTargetMachine(), ArgLocs, *DAG.getContext()); 161 CCInfo.AnalyzeFormalArguments(Ins, CC_Sparc32); 162 163 const unsigned StackOffset = 92; 164 165 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) { 166 CCValAssign &VA = ArgLocs[i]; 167 168 if (i == 0 && Ins[i].Flags.isSRet()) { 169 //Get SRet from [%fp+64] 170 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, 64, true); 171 SDValue FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32); 172 SDValue Arg = DAG.getLoad(MVT::i32, dl, Chain, FIPtr, 173 MachinePointerInfo(), 174 false, false, false, 0); 175 InVals.push_back(Arg); 176 continue; 177 } 178 179 if (VA.isRegLoc()) { 180 if (VA.needsCustom()) { 181 assert(VA.getLocVT() == MVT::f64); 182 unsigned VRegHi = RegInfo.createVirtualRegister(&SP::IntRegsRegClass); 183 MF.getRegInfo().addLiveIn(VA.getLocReg(), VRegHi); 184 SDValue HiVal = DAG.getCopyFromReg(Chain, dl, VRegHi, MVT::i32); 185 186 assert(i+1 < e); 187 CCValAssign &NextVA = ArgLocs[++i]; 188 189 SDValue LoVal; 190 if (NextVA.isMemLoc()) { 191 int FrameIdx = MF.getFrameInfo()-> 192 CreateFixedObject(4, StackOffset+NextVA.getLocMemOffset(),true); 193 SDValue FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32); 194 LoVal = DAG.getLoad(MVT::i32, dl, Chain, FIPtr, 195 MachinePointerInfo(), 196 false, false, false, 0); 197 } else { 198 unsigned loReg = MF.addLiveIn(NextVA.getLocReg(), 199 &SP::IntRegsRegClass); 200 LoVal = DAG.getCopyFromReg(Chain, dl, loReg, MVT::i32); 201 } 202 SDValue WholeValue = 203 DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, LoVal, HiVal); 204 WholeValue = DAG.getNode(ISD::BITCAST, dl, MVT::f64, WholeValue); 205 InVals.push_back(WholeValue); 206 continue; 207 } 208 unsigned VReg = RegInfo.createVirtualRegister(&SP::IntRegsRegClass); 209 MF.getRegInfo().addLiveIn(VA.getLocReg(), VReg); 210 SDValue Arg = DAG.getCopyFromReg(Chain, dl, VReg, MVT::i32); 211 if (VA.getLocVT() == MVT::f32) 212 Arg = DAG.getNode(ISD::BITCAST, dl, MVT::f32, Arg); 213 else if (VA.getLocVT() != MVT::i32) { 214 Arg = DAG.getNode(ISD::AssertSext, dl, MVT::i32, Arg, 215 DAG.getValueType(VA.getLocVT())); 216 Arg = DAG.getNode(ISD::TRUNCATE, dl, VA.getLocVT(), Arg); 217 } 218 InVals.push_back(Arg); 219 continue; 220 } 221 222 assert(VA.isMemLoc()); 223 224 unsigned Offset = VA.getLocMemOffset()+StackOffset; 225 226 if (VA.needsCustom()) { 227 assert(VA.getValVT() == MVT::f64); 228 //If it is double-word aligned, just load. 229 if (Offset % 8 == 0) { 230 int FI = MF.getFrameInfo()->CreateFixedObject(8, 231 Offset, 232 true); 233 SDValue FIPtr = DAG.getFrameIndex(FI, getPointerTy()); 234 SDValue Load = DAG.getLoad(VA.getValVT(), dl, Chain, FIPtr, 235 MachinePointerInfo(), 236 false,false, false, 0); 237 InVals.push_back(Load); 238 continue; 239 } 240 241 int FI = MF.getFrameInfo()->CreateFixedObject(4, 242 Offset, 243 true); 244 SDValue FIPtr = DAG.getFrameIndex(FI, getPointerTy()); 245 SDValue HiVal = DAG.getLoad(MVT::i32, dl, Chain, FIPtr, 246 MachinePointerInfo(), 247 false, false, false, 0); 248 int FI2 = MF.getFrameInfo()->CreateFixedObject(4, 249 Offset+4, 250 true); 251 SDValue FIPtr2 = DAG.getFrameIndex(FI2, getPointerTy()); 252 253 SDValue LoVal = DAG.getLoad(MVT::i32, dl, Chain, FIPtr2, 254 MachinePointerInfo(), 255 false, false, false, 0); 256 257 SDValue WholeValue = 258 DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, LoVal, HiVal); 259 WholeValue = DAG.getNode(ISD::BITCAST, dl, MVT::f64, WholeValue); 260 InVals.push_back(WholeValue); 261 continue; 262 } 263 264 int FI = MF.getFrameInfo()->CreateFixedObject(4, 265 Offset, 266 true); 267 SDValue FIPtr = DAG.getFrameIndex(FI, getPointerTy()); 268 SDValue Load ; 269 if (VA.getValVT() == MVT::i32 || VA.getValVT() == MVT::f32) { 270 Load = DAG.getLoad(VA.getValVT(), dl, Chain, FIPtr, 271 MachinePointerInfo(), 272 false, false, false, 0); 273 } else { 274 ISD::LoadExtType LoadOp = ISD::SEXTLOAD; 275 // Sparc is big endian, so add an offset based on the ObjectVT. 276 unsigned Offset = 4-std::max(1U, VA.getValVT().getSizeInBits()/8); 277 FIPtr = DAG.getNode(ISD::ADD, dl, MVT::i32, FIPtr, 278 DAG.getConstant(Offset, MVT::i32)); 279 Load = DAG.getExtLoad(LoadOp, dl, MVT::i32, Chain, FIPtr, 280 MachinePointerInfo(), 281 VA.getValVT(), false, false,0); 282 Load = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), Load); 283 } 284 InVals.push_back(Load); 285 } 286 287 if (MF.getFunction()->hasStructRetAttr()) { 288 //Copy the SRet Argument to SRetReturnReg 289 SparcMachineFunctionInfo *SFI = MF.getInfo<SparcMachineFunctionInfo>(); 290 unsigned Reg = SFI->getSRetReturnReg(); 291 if (!Reg) { 292 Reg = MF.getRegInfo().createVirtualRegister(&SP::IntRegsRegClass); 293 SFI->setSRetReturnReg(Reg); 294 } 295 SDValue Copy = DAG.getCopyToReg(DAG.getEntryNode(), dl, Reg, InVals[0]); 296 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Copy, Chain); 297 } 298 299 // Store remaining ArgRegs to the stack if this is a varargs function. 300 if (isVarArg) { 301 static const uint16_t ArgRegs[] = { 302 SP::I0, SP::I1, SP::I2, SP::I3, SP::I4, SP::I5 303 }; 304 unsigned NumAllocated = CCInfo.getFirstUnallocated(ArgRegs, 6); 305 const uint16_t *CurArgReg = ArgRegs+NumAllocated, *ArgRegEnd = ArgRegs+6; 306 unsigned ArgOffset = CCInfo.getNextStackOffset(); 307 if (NumAllocated == 6) 308 ArgOffset += StackOffset; 309 else { 310 assert(!ArgOffset); 311 ArgOffset = 68+4*NumAllocated; 312 } 313 314 // Remember the vararg offset for the va_start implementation. 315 FuncInfo->setVarArgsFrameOffset(ArgOffset); 316 317 std::vector<SDValue> OutChains; 318 319 for (; CurArgReg != ArgRegEnd; ++CurArgReg) { 320 unsigned VReg = RegInfo.createVirtualRegister(&SP::IntRegsRegClass); 321 MF.getRegInfo().addLiveIn(*CurArgReg, VReg); 322 SDValue Arg = DAG.getCopyFromReg(DAG.getRoot(), dl, VReg, MVT::i32); 323 324 int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset, 325 true); 326 SDValue FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32); 327 328 OutChains.push_back(DAG.getStore(DAG.getRoot(), dl, Arg, FIPtr, 329 MachinePointerInfo(), 330 false, false, 0)); 331 ArgOffset += 4; 332 } 333 334 if (!OutChains.empty()) { 335 OutChains.push_back(Chain); 336 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, 337 &OutChains[0], OutChains.size()); 338 } 339 } 340 341 return Chain; 342 } 343 344 SDValue 345 SparcTargetLowering::LowerCall(TargetLowering::CallLoweringInfo &CLI, 346 SmallVectorImpl<SDValue> &InVals) const { 347 SelectionDAG &DAG = CLI.DAG; 348 DebugLoc &dl = CLI.DL; 349 SmallVector<ISD::OutputArg, 32> &Outs = CLI.Outs; 350 SmallVector<SDValue, 32> &OutVals = CLI.OutVals; 351 SmallVector<ISD::InputArg, 32> &Ins = CLI.Ins; 352 SDValue Chain = CLI.Chain; 353 SDValue Callee = CLI.Callee; 354 bool &isTailCall = CLI.IsTailCall; 355 CallingConv::ID CallConv = CLI.CallConv; 356 bool isVarArg = CLI.IsVarArg; 357 358 // Sparc target does not yet support tail call optimization. 359 isTailCall = false; 360 361 // Analyze operands of the call, assigning locations to each operand. 362 SmallVector<CCValAssign, 16> ArgLocs; 363 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(), 364 DAG.getTarget(), ArgLocs, *DAG.getContext()); 365 CCInfo.AnalyzeCallOperands(Outs, CC_Sparc32); 366 367 // Get the size of the outgoing arguments stack space requirement. 368 unsigned ArgsSize = CCInfo.getNextStackOffset(); 369 370 // Keep stack frames 8-byte aligned. 371 ArgsSize = (ArgsSize+7) & ~7; 372 373 MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo(); 374 375 //Create local copies for byval args. 376 SmallVector<SDValue, 8> ByValArgs; 377 for (unsigned i = 0, e = Outs.size(); i != e; ++i) { 378 ISD::ArgFlagsTy Flags = Outs[i].Flags; 379 if (!Flags.isByVal()) 380 continue; 381 382 SDValue Arg = OutVals[i]; 383 unsigned Size = Flags.getByValSize(); 384 unsigned Align = Flags.getByValAlign(); 385 386 int FI = MFI->CreateStackObject(Size, Align, false); 387 SDValue FIPtr = DAG.getFrameIndex(FI, getPointerTy()); 388 SDValue SizeNode = DAG.getConstant(Size, MVT::i32); 389 390 Chain = DAG.getMemcpy(Chain, dl, FIPtr, Arg, SizeNode, Align, 391 false, //isVolatile, 392 (Size <= 32), //AlwaysInline if size <= 32 393 MachinePointerInfo(), MachinePointerInfo()); 394 ByValArgs.push_back(FIPtr); 395 } 396 397 Chain = DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(ArgsSize, true)); 398 399 SmallVector<std::pair<unsigned, SDValue>, 8> RegsToPass; 400 SmallVector<SDValue, 8> MemOpChains; 401 402 const unsigned StackOffset = 92; 403 bool hasStructRetAttr = false; 404 // Walk the register/memloc assignments, inserting copies/loads. 405 for (unsigned i = 0, realArgIdx = 0, byvalArgIdx = 0, e = ArgLocs.size(); 406 i != e; 407 ++i, ++realArgIdx) { 408 CCValAssign &VA = ArgLocs[i]; 409 SDValue Arg = OutVals[realArgIdx]; 410 411 ISD::ArgFlagsTy Flags = Outs[realArgIdx].Flags; 412 413 //Use local copy if it is a byval arg. 414 if (Flags.isByVal()) 415 Arg = ByValArgs[byvalArgIdx++]; 416 417 // Promote the value if needed. 418 switch (VA.getLocInfo()) { 419 default: llvm_unreachable("Unknown loc info!"); 420 case CCValAssign::Full: break; 421 case CCValAssign::SExt: 422 Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), Arg); 423 break; 424 case CCValAssign::ZExt: 425 Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), Arg); 426 break; 427 case CCValAssign::AExt: 428 Arg = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), Arg); 429 break; 430 case CCValAssign::BCvt: 431 Arg = DAG.getNode(ISD::BITCAST, dl, VA.getLocVT(), Arg); 432 break; 433 } 434 435 if (Flags.isSRet()) { 436 assert(VA.needsCustom()); 437 // store SRet argument in %sp+64 438 SDValue StackPtr = DAG.getRegister(SP::O6, MVT::i32); 439 SDValue PtrOff = DAG.getIntPtrConstant(64); 440 PtrOff = DAG.getNode(ISD::ADD, dl, MVT::i32, StackPtr, PtrOff); 441 MemOpChains.push_back(DAG.getStore(Chain, dl, Arg, PtrOff, 442 MachinePointerInfo(), 443 false, false, 0)); 444 hasStructRetAttr = true; 445 continue; 446 } 447 448 if (VA.needsCustom()) { 449 assert(VA.getLocVT() == MVT::f64); 450 451 if (VA.isMemLoc()) { 452 unsigned Offset = VA.getLocMemOffset() + StackOffset; 453 //if it is double-word aligned, just store. 454 if (Offset % 8 == 0) { 455 SDValue StackPtr = DAG.getRegister(SP::O6, MVT::i32); 456 SDValue PtrOff = DAG.getIntPtrConstant(Offset); 457 PtrOff = DAG.getNode(ISD::ADD, dl, MVT::i32, StackPtr, PtrOff); 458 MemOpChains.push_back(DAG.getStore(Chain, dl, Arg, PtrOff, 459 MachinePointerInfo(), 460 false, false, 0)); 461 continue; 462 } 463 } 464 465 SDValue StackPtr = DAG.CreateStackTemporary(MVT::f64, MVT::i32); 466 SDValue Store = DAG.getStore(DAG.getEntryNode(), dl, 467 Arg, StackPtr, MachinePointerInfo(), 468 false, false, 0); 469 // Sparc is big-endian, so the high part comes first. 470 SDValue Hi = DAG.getLoad(MVT::i32, dl, Store, StackPtr, 471 MachinePointerInfo(), false, false, false, 0); 472 // Increment the pointer to the other half. 473 StackPtr = DAG.getNode(ISD::ADD, dl, StackPtr.getValueType(), StackPtr, 474 DAG.getIntPtrConstant(4)); 475 // Load the low part. 476 SDValue Lo = DAG.getLoad(MVT::i32, dl, Store, StackPtr, 477 MachinePointerInfo(), false, false, false, 0); 478 479 if (VA.isRegLoc()) { 480 RegsToPass.push_back(std::make_pair(VA.getLocReg(), Hi)); 481 assert(i+1 != e); 482 CCValAssign &NextVA = ArgLocs[++i]; 483 if (NextVA.isRegLoc()) { 484 RegsToPass.push_back(std::make_pair(NextVA.getLocReg(), Lo)); 485 } else { 486 //Store the low part in stack. 487 unsigned Offset = NextVA.getLocMemOffset() + StackOffset; 488 SDValue StackPtr = DAG.getRegister(SP::O6, MVT::i32); 489 SDValue PtrOff = DAG.getIntPtrConstant(Offset); 490 PtrOff = DAG.getNode(ISD::ADD, dl, MVT::i32, StackPtr, PtrOff); 491 MemOpChains.push_back(DAG.getStore(Chain, dl, Lo, PtrOff, 492 MachinePointerInfo(), 493 false, false, 0)); 494 } 495 } else { 496 unsigned Offset = VA.getLocMemOffset() + StackOffset; 497 // Store the high part. 498 SDValue StackPtr = DAG.getRegister(SP::O6, MVT::i32); 499 SDValue PtrOff = DAG.getIntPtrConstant(Offset); 500 PtrOff = DAG.getNode(ISD::ADD, dl, MVT::i32, StackPtr, PtrOff); 501 MemOpChains.push_back(DAG.getStore(Chain, dl, Hi, PtrOff, 502 MachinePointerInfo(), 503 false, false, 0)); 504 // Store the low part. 505 PtrOff = DAG.getIntPtrConstant(Offset+4); 506 PtrOff = DAG.getNode(ISD::ADD, dl, MVT::i32, StackPtr, PtrOff); 507 MemOpChains.push_back(DAG.getStore(Chain, dl, Lo, PtrOff, 508 MachinePointerInfo(), 509 false, false, 0)); 510 } 511 continue; 512 } 513 514 // Arguments that can be passed on register must be kept at 515 // RegsToPass vector 516 if (VA.isRegLoc()) { 517 if (VA.getLocVT() != MVT::f32) { 518 RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg)); 519 continue; 520 } 521 Arg = DAG.getNode(ISD::BITCAST, dl, MVT::i32, Arg); 522 RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg)); 523 continue; 524 } 525 526 assert(VA.isMemLoc()); 527 528 // Create a store off the stack pointer for this argument. 529 SDValue StackPtr = DAG.getRegister(SP::O6, MVT::i32); 530 SDValue PtrOff = DAG.getIntPtrConstant(VA.getLocMemOffset()+StackOffset); 531 PtrOff = DAG.getNode(ISD::ADD, dl, MVT::i32, StackPtr, PtrOff); 532 MemOpChains.push_back(DAG.getStore(Chain, dl, Arg, PtrOff, 533 MachinePointerInfo(), 534 false, false, 0)); 535 } 536 537 538 // Emit all stores, make sure the occur before any copies into physregs. 539 if (!MemOpChains.empty()) 540 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, 541 &MemOpChains[0], MemOpChains.size()); 542 543 // Build a sequence of copy-to-reg nodes chained together with token 544 // chain and flag operands which copy the outgoing args into registers. 545 // The InFlag in necessary since all emitted instructions must be 546 // stuck together. 547 SDValue InFlag; 548 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) { 549 unsigned Reg = RegsToPass[i].first; 550 // Remap I0->I7 -> O0->O7. 551 if (Reg >= SP::I0 && Reg <= SP::I7) 552 Reg = Reg-SP::I0+SP::O0; 553 554 Chain = DAG.getCopyToReg(Chain, dl, Reg, RegsToPass[i].second, InFlag); 555 InFlag = Chain.getValue(1); 556 } 557 558 unsigned SRetArgSize = (hasStructRetAttr)? getSRetArgSize(DAG, Callee):0; 559 560 // If the callee is a GlobalAddress node (quite common, every direct call is) 561 // turn it into a TargetGlobalAddress node so that legalize doesn't hack it. 562 // Likewise ExternalSymbol -> TargetExternalSymbol. 563 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) 564 Callee = DAG.getTargetGlobalAddress(G->getGlobal(), dl, MVT::i32); 565 else if (ExternalSymbolSDNode *E = dyn_cast<ExternalSymbolSDNode>(Callee)) 566 Callee = DAG.getTargetExternalSymbol(E->getSymbol(), MVT::i32); 567 568 // Returns a chain & a flag for retval copy to use 569 SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue); 570 SmallVector<SDValue, 8> Ops; 571 Ops.push_back(Chain); 572 Ops.push_back(Callee); 573 if (hasStructRetAttr) 574 Ops.push_back(DAG.getTargetConstant(SRetArgSize, MVT::i32)); 575 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) { 576 unsigned Reg = RegsToPass[i].first; 577 if (Reg >= SP::I0 && Reg <= SP::I7) 578 Reg = Reg-SP::I0+SP::O0; 579 580 Ops.push_back(DAG.getRegister(Reg, RegsToPass[i].second.getValueType())); 581 } 582 if (InFlag.getNode()) 583 Ops.push_back(InFlag); 584 585 Chain = DAG.getNode(SPISD::CALL, dl, NodeTys, &Ops[0], Ops.size()); 586 InFlag = Chain.getValue(1); 587 588 Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(ArgsSize, true), 589 DAG.getIntPtrConstant(0, true), InFlag); 590 InFlag = Chain.getValue(1); 591 592 // Assign locations to each value returned by this call. 593 SmallVector<CCValAssign, 16> RVLocs; 594 CCState RVInfo(CallConv, isVarArg, DAG.getMachineFunction(), 595 DAG.getTarget(), RVLocs, *DAG.getContext()); 596 597 RVInfo.AnalyzeCallResult(Ins, RetCC_Sparc32); 598 599 // Copy all of the result registers out of their specified physreg. 600 for (unsigned i = 0; i != RVLocs.size(); ++i) { 601 unsigned Reg = RVLocs[i].getLocReg(); 602 603 // Remap I0->I7 -> O0->O7. 604 if (Reg >= SP::I0 && Reg <= SP::I7) 605 Reg = Reg-SP::I0+SP::O0; 606 607 Chain = DAG.getCopyFromReg(Chain, dl, Reg, 608 RVLocs[i].getValVT(), InFlag).getValue(1); 609 InFlag = Chain.getValue(2); 610 InVals.push_back(Chain.getValue(0)); 611 } 612 613 return Chain; 614 } 615 616 unsigned 617 SparcTargetLowering::getSRetArgSize(SelectionDAG &DAG, SDValue Callee) const 618 { 619 const Function *CalleeFn = 0; 620 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) { 621 CalleeFn = dyn_cast<Function>(G->getGlobal()); 622 } else if (ExternalSymbolSDNode *E = 623 dyn_cast<ExternalSymbolSDNode>(Callee)) { 624 const Function *Fn = DAG.getMachineFunction().getFunction(); 625 const Module *M = Fn->getParent(); 626 CalleeFn = M->getFunction(E->getSymbol()); 627 } 628 629 if (!CalleeFn) 630 return 0; 631 632 assert(CalleeFn->hasStructRetAttr() && 633 "Callee does not have the StructRet attribute."); 634 635 PointerType *Ty = cast<PointerType>(CalleeFn->arg_begin()->getType()); 636 Type *ElementTy = Ty->getElementType(); 637 return getDataLayout()->getTypeAllocSize(ElementTy); 638 } 639 640 //===----------------------------------------------------------------------===// 641 // TargetLowering Implementation 642 //===----------------------------------------------------------------------===// 643 644 /// IntCondCCodeToICC - Convert a DAG integer condition code to a SPARC ICC 645 /// condition. 646 static SPCC::CondCodes IntCondCCodeToICC(ISD::CondCode CC) { 647 switch (CC) { 648 default: llvm_unreachable("Unknown integer condition code!"); 649 case ISD::SETEQ: return SPCC::ICC_E; 650 case ISD::SETNE: return SPCC::ICC_NE; 651 case ISD::SETLT: return SPCC::ICC_L; 652 case ISD::SETGT: return SPCC::ICC_G; 653 case ISD::SETLE: return SPCC::ICC_LE; 654 case ISD::SETGE: return SPCC::ICC_GE; 655 case ISD::SETULT: return SPCC::ICC_CS; 656 case ISD::SETULE: return SPCC::ICC_LEU; 657 case ISD::SETUGT: return SPCC::ICC_GU; 658 case ISD::SETUGE: return SPCC::ICC_CC; 659 } 660 } 661 662 /// FPCondCCodeToFCC - Convert a DAG floatingp oint condition code to a SPARC 663 /// FCC condition. 664 static SPCC::CondCodes FPCondCCodeToFCC(ISD::CondCode CC) { 665 switch (CC) { 666 default: llvm_unreachable("Unknown fp condition code!"); 667 case ISD::SETEQ: 668 case ISD::SETOEQ: return SPCC::FCC_E; 669 case ISD::SETNE: 670 case ISD::SETUNE: return SPCC::FCC_NE; 671 case ISD::SETLT: 672 case ISD::SETOLT: return SPCC::FCC_L; 673 case ISD::SETGT: 674 case ISD::SETOGT: return SPCC::FCC_G; 675 case ISD::SETLE: 676 case ISD::SETOLE: return SPCC::FCC_LE; 677 case ISD::SETGE: 678 case ISD::SETOGE: return SPCC::FCC_GE; 679 case ISD::SETULT: return SPCC::FCC_UL; 680 case ISD::SETULE: return SPCC::FCC_ULE; 681 case ISD::SETUGT: return SPCC::FCC_UG; 682 case ISD::SETUGE: return SPCC::FCC_UGE; 683 case ISD::SETUO: return SPCC::FCC_U; 684 case ISD::SETO: return SPCC::FCC_O; 685 case ISD::SETONE: return SPCC::FCC_LG; 686 case ISD::SETUEQ: return SPCC::FCC_UE; 687 } 688 } 689 690 SparcTargetLowering::SparcTargetLowering(TargetMachine &TM) 691 : TargetLowering(TM, new TargetLoweringObjectFileELF()) { 692 693 // Set up the register classes. 694 addRegisterClass(MVT::i32, &SP::IntRegsRegClass); 695 addRegisterClass(MVT::f32, &SP::FPRegsRegClass); 696 addRegisterClass(MVT::f64, &SP::DFPRegsRegClass); 697 698 // Turn FP extload into load/fextend 699 setLoadExtAction(ISD::EXTLOAD, MVT::f32, Expand); 700 // Sparc doesn't have i1 sign extending load 701 setLoadExtAction(ISD::SEXTLOAD, MVT::i1, Promote); 702 // Turn FP truncstore into trunc + store. 703 setTruncStoreAction(MVT::f64, MVT::f32, Expand); 704 705 // Custom legalize GlobalAddress nodes into LO/HI parts. 706 setOperationAction(ISD::GlobalAddress, MVT::i32, Custom); 707 setOperationAction(ISD::GlobalTLSAddress, MVT::i32, Custom); 708 setOperationAction(ISD::ConstantPool , MVT::i32, Custom); 709 710 // Sparc doesn't have sext_inreg, replace them with shl/sra 711 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i16, Expand); 712 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i8 , Expand); 713 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1 , Expand); 714 715 // Sparc has no REM or DIVREM operations. 716 setOperationAction(ISD::UREM, MVT::i32, Expand); 717 setOperationAction(ISD::SREM, MVT::i32, Expand); 718 setOperationAction(ISD::SDIVREM, MVT::i32, Expand); 719 setOperationAction(ISD::UDIVREM, MVT::i32, Expand); 720 721 // Custom expand fp<->sint 722 setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom); 723 setOperationAction(ISD::SINT_TO_FP, MVT::i32, Custom); 724 725 // Expand fp<->uint 726 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Expand); 727 setOperationAction(ISD::UINT_TO_FP, MVT::i32, Expand); 728 729 setOperationAction(ISD::BITCAST, MVT::f32, Expand); 730 setOperationAction(ISD::BITCAST, MVT::i32, Expand); 731 732 // Sparc has no select or setcc: expand to SELECT_CC. 733 setOperationAction(ISD::SELECT, MVT::i32, Expand); 734 setOperationAction(ISD::SELECT, MVT::f32, Expand); 735 setOperationAction(ISD::SELECT, MVT::f64, Expand); 736 setOperationAction(ISD::SETCC, MVT::i32, Expand); 737 setOperationAction(ISD::SETCC, MVT::f32, Expand); 738 setOperationAction(ISD::SETCC, MVT::f64, Expand); 739 740 // Sparc doesn't have BRCOND either, it has BR_CC. 741 setOperationAction(ISD::BRCOND, MVT::Other, Expand); 742 setOperationAction(ISD::BRIND, MVT::Other, Expand); 743 setOperationAction(ISD::BR_JT, MVT::Other, Expand); 744 setOperationAction(ISD::BR_CC, MVT::i32, Custom); 745 setOperationAction(ISD::BR_CC, MVT::f32, Custom); 746 setOperationAction(ISD::BR_CC, MVT::f64, Custom); 747 748 setOperationAction(ISD::SELECT_CC, MVT::i32, Custom); 749 setOperationAction(ISD::SELECT_CC, MVT::f32, Custom); 750 setOperationAction(ISD::SELECT_CC, MVT::f64, Custom); 751 752 // FIXME: There are instructions available for ATOMIC_FENCE 753 // on SparcV8 and later. 754 setOperationAction(ISD::MEMBARRIER, MVT::Other, Expand); 755 setOperationAction(ISD::ATOMIC_FENCE, MVT::Other, Expand); 756 757 setOperationAction(ISD::FSIN , MVT::f64, Expand); 758 setOperationAction(ISD::FCOS , MVT::f64, Expand); 759 setOperationAction(ISD::FSINCOS, MVT::f64, Expand); 760 setOperationAction(ISD::FREM , MVT::f64, Expand); 761 setOperationAction(ISD::FMA , MVT::f64, Expand); 762 setOperationAction(ISD::FSIN , MVT::f32, Expand); 763 setOperationAction(ISD::FCOS , MVT::f32, Expand); 764 setOperationAction(ISD::FSINCOS, MVT::f32, Expand); 765 setOperationAction(ISD::FREM , MVT::f32, Expand); 766 setOperationAction(ISD::FMA , MVT::f32, Expand); 767 setOperationAction(ISD::CTPOP, MVT::i32, Expand); 768 setOperationAction(ISD::CTTZ , MVT::i32, Expand); 769 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::i32, Expand); 770 setOperationAction(ISD::CTLZ , MVT::i32, Expand); 771 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i32, Expand); 772 setOperationAction(ISD::ROTL , MVT::i32, Expand); 773 setOperationAction(ISD::ROTR , MVT::i32, Expand); 774 setOperationAction(ISD::BSWAP, MVT::i32, Expand); 775 setOperationAction(ISD::FCOPYSIGN, MVT::f64, Expand); 776 setOperationAction(ISD::FCOPYSIGN, MVT::f32, Expand); 777 setOperationAction(ISD::FPOW , MVT::f64, Expand); 778 setOperationAction(ISD::FPOW , MVT::f32, Expand); 779 780 setOperationAction(ISD::SHL_PARTS, MVT::i32, Expand); 781 setOperationAction(ISD::SRA_PARTS, MVT::i32, Expand); 782 setOperationAction(ISD::SRL_PARTS, MVT::i32, Expand); 783 784 // FIXME: Sparc provides these multiplies, but we don't have them yet. 785 setOperationAction(ISD::UMUL_LOHI, MVT::i32, Expand); 786 setOperationAction(ISD::SMUL_LOHI, MVT::i32, Expand); 787 788 setOperationAction(ISD::EH_LABEL, MVT::Other, Expand); 789 790 // VASTART needs to be custom lowered to use the VarArgsFrameIndex. 791 setOperationAction(ISD::VASTART , MVT::Other, Custom); 792 // VAARG needs to be lowered to not do unaligned accesses for doubles. 793 setOperationAction(ISD::VAARG , MVT::Other, Custom); 794 795 // Use the default implementation. 796 setOperationAction(ISD::VACOPY , MVT::Other, Expand); 797 setOperationAction(ISD::VAEND , MVT::Other, Expand); 798 setOperationAction(ISD::STACKSAVE , MVT::Other, Expand); 799 setOperationAction(ISD::STACKRESTORE , MVT::Other, Expand); 800 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32 , Custom); 801 802 // No debug info support yet. 803 setOperationAction(ISD::EH_LABEL, MVT::Other, Expand); 804 805 setStackPointerRegisterToSaveRestore(SP::O6); 806 807 if (TM.getSubtarget<SparcSubtarget>().isV9()) 808 setOperationAction(ISD::CTPOP, MVT::i32, Legal); 809 810 setMinFunctionAlignment(2); 811 812 computeRegisterProperties(); 813 } 814 815 const char *SparcTargetLowering::getTargetNodeName(unsigned Opcode) const { 816 switch (Opcode) { 817 default: return 0; 818 case SPISD::CMPICC: return "SPISD::CMPICC"; 819 case SPISD::CMPFCC: return "SPISD::CMPFCC"; 820 case SPISD::BRICC: return "SPISD::BRICC"; 821 case SPISD::BRFCC: return "SPISD::BRFCC"; 822 case SPISD::SELECT_ICC: return "SPISD::SELECT_ICC"; 823 case SPISD::SELECT_FCC: return "SPISD::SELECT_FCC"; 824 case SPISD::Hi: return "SPISD::Hi"; 825 case SPISD::Lo: return "SPISD::Lo"; 826 case SPISD::FTOI: return "SPISD::FTOI"; 827 case SPISD::ITOF: return "SPISD::ITOF"; 828 case SPISD::CALL: return "SPISD::CALL"; 829 case SPISD::RET_FLAG: return "SPISD::RET_FLAG"; 830 case SPISD::GLOBAL_BASE_REG: return "SPISD::GLOBAL_BASE_REG"; 831 case SPISD::FLUSHW: return "SPISD::FLUSHW"; 832 } 833 } 834 835 /// isMaskedValueZeroForTargetNode - Return true if 'Op & Mask' is known to 836 /// be zero. Op is expected to be a target specific node. Used by DAG 837 /// combiner. 838 void SparcTargetLowering::computeMaskedBitsForTargetNode(const SDValue Op, 839 APInt &KnownZero, 840 APInt &KnownOne, 841 const SelectionDAG &DAG, 842 unsigned Depth) const { 843 APInt KnownZero2, KnownOne2; 844 KnownZero = KnownOne = APInt(KnownZero.getBitWidth(), 0); 845 846 switch (Op.getOpcode()) { 847 default: break; 848 case SPISD::SELECT_ICC: 849 case SPISD::SELECT_FCC: 850 DAG.ComputeMaskedBits(Op.getOperand(1), KnownZero, KnownOne, Depth+1); 851 DAG.ComputeMaskedBits(Op.getOperand(0), KnownZero2, KnownOne2, Depth+1); 852 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?"); 853 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?"); 854 855 // Only known if known in both the LHS and RHS. 856 KnownOne &= KnownOne2; 857 KnownZero &= KnownZero2; 858 break; 859 } 860 } 861 862 // Look at LHS/RHS/CC and see if they are a lowered setcc instruction. If so 863 // set LHS/RHS and SPCC to the LHS/RHS of the setcc and SPCC to the condition. 864 static void LookThroughSetCC(SDValue &LHS, SDValue &RHS, 865 ISD::CondCode CC, unsigned &SPCC) { 866 if (isa<ConstantSDNode>(RHS) && 867 cast<ConstantSDNode>(RHS)->isNullValue() && 868 CC == ISD::SETNE && 869 ((LHS.getOpcode() == SPISD::SELECT_ICC && 870 LHS.getOperand(3).getOpcode() == SPISD::CMPICC) || 871 (LHS.getOpcode() == SPISD::SELECT_FCC && 872 LHS.getOperand(3).getOpcode() == SPISD::CMPFCC)) && 873 isa<ConstantSDNode>(LHS.getOperand(0)) && 874 isa<ConstantSDNode>(LHS.getOperand(1)) && 875 cast<ConstantSDNode>(LHS.getOperand(0))->isOne() && 876 cast<ConstantSDNode>(LHS.getOperand(1))->isNullValue()) { 877 SDValue CMPCC = LHS.getOperand(3); 878 SPCC = cast<ConstantSDNode>(LHS.getOperand(2))->getZExtValue(); 879 LHS = CMPCC.getOperand(0); 880 RHS = CMPCC.getOperand(1); 881 } 882 } 883 884 SDValue SparcTargetLowering::LowerGlobalAddress(SDValue Op, 885 SelectionDAG &DAG) const { 886 const GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal(); 887 // FIXME there isn't really any debug info here 888 DebugLoc dl = Op.getDebugLoc(); 889 SDValue GA = DAG.getTargetGlobalAddress(GV, dl, MVT::i32); 890 SDValue Hi = DAG.getNode(SPISD::Hi, dl, MVT::i32, GA); 891 SDValue Lo = DAG.getNode(SPISD::Lo, dl, MVT::i32, GA); 892 893 if (getTargetMachine().getRelocationModel() != Reloc::PIC_) 894 return DAG.getNode(ISD::ADD, dl, MVT::i32, Lo, Hi); 895 896 SDValue GlobalBase = DAG.getNode(SPISD::GLOBAL_BASE_REG, dl, 897 getPointerTy()); 898 SDValue RelAddr = DAG.getNode(ISD::ADD, dl, MVT::i32, Lo, Hi); 899 SDValue AbsAddr = DAG.getNode(ISD::ADD, dl, MVT::i32, 900 GlobalBase, RelAddr); 901 return DAG.getLoad(getPointerTy(), dl, DAG.getEntryNode(), 902 AbsAddr, MachinePointerInfo(), false, false, false, 0); 903 } 904 905 SDValue SparcTargetLowering::LowerConstantPool(SDValue Op, 906 SelectionDAG &DAG) const { 907 ConstantPoolSDNode *N = cast<ConstantPoolSDNode>(Op); 908 // FIXME there isn't really any debug info here 909 DebugLoc dl = Op.getDebugLoc(); 910 const Constant *C = N->getConstVal(); 911 SDValue CP = DAG.getTargetConstantPool(C, MVT::i32, N->getAlignment()); 912 SDValue Hi = DAG.getNode(SPISD::Hi, dl, MVT::i32, CP); 913 SDValue Lo = DAG.getNode(SPISD::Lo, dl, MVT::i32, CP); 914 if (getTargetMachine().getRelocationModel() != Reloc::PIC_) 915 return DAG.getNode(ISD::ADD, dl, MVT::i32, Lo, Hi); 916 917 SDValue GlobalBase = DAG.getNode(SPISD::GLOBAL_BASE_REG, dl, 918 getPointerTy()); 919 SDValue RelAddr = DAG.getNode(ISD::ADD, dl, MVT::i32, Lo, Hi); 920 SDValue AbsAddr = DAG.getNode(ISD::ADD, dl, MVT::i32, 921 GlobalBase, RelAddr); 922 return DAG.getLoad(getPointerTy(), dl, DAG.getEntryNode(), 923 AbsAddr, MachinePointerInfo(), false, false, false, 0); 924 } 925 926 static SDValue LowerFP_TO_SINT(SDValue Op, SelectionDAG &DAG) { 927 DebugLoc dl = Op.getDebugLoc(); 928 // Convert the fp value to integer in an FP register. 929 assert(Op.getValueType() == MVT::i32); 930 Op = DAG.getNode(SPISD::FTOI, dl, MVT::f32, Op.getOperand(0)); 931 return DAG.getNode(ISD::BITCAST, dl, MVT::i32, Op); 932 } 933 934 static SDValue LowerSINT_TO_FP(SDValue Op, SelectionDAG &DAG) { 935 DebugLoc dl = Op.getDebugLoc(); 936 assert(Op.getOperand(0).getValueType() == MVT::i32); 937 SDValue Tmp = DAG.getNode(ISD::BITCAST, dl, MVT::f32, Op.getOperand(0)); 938 // Convert the int value to FP in an FP register. 939 return DAG.getNode(SPISD::ITOF, dl, Op.getValueType(), Tmp); 940 } 941 942 static SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG) { 943 SDValue Chain = Op.getOperand(0); 944 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get(); 945 SDValue LHS = Op.getOperand(2); 946 SDValue RHS = Op.getOperand(3); 947 SDValue Dest = Op.getOperand(4); 948 DebugLoc dl = Op.getDebugLoc(); 949 unsigned Opc, SPCC = ~0U; 950 951 // If this is a br_cc of a "setcc", and if the setcc got lowered into 952 // an CMP[IF]CC/SELECT_[IF]CC pair, find the original compared values. 953 LookThroughSetCC(LHS, RHS, CC, SPCC); 954 955 // Get the condition flag. 956 SDValue CompareFlag; 957 if (LHS.getValueType() == MVT::i32) { 958 EVT VTs[] = { MVT::i32, MVT::Glue }; 959 SDValue Ops[2] = { LHS, RHS }; 960 CompareFlag = DAG.getNode(SPISD::CMPICC, dl, VTs, Ops, 2).getValue(1); 961 if (SPCC == ~0U) SPCC = IntCondCCodeToICC(CC); 962 Opc = SPISD::BRICC; 963 } else { 964 CompareFlag = DAG.getNode(SPISD::CMPFCC, dl, MVT::Glue, LHS, RHS); 965 if (SPCC == ~0U) SPCC = FPCondCCodeToFCC(CC); 966 Opc = SPISD::BRFCC; 967 } 968 return DAG.getNode(Opc, dl, MVT::Other, Chain, Dest, 969 DAG.getConstant(SPCC, MVT::i32), CompareFlag); 970 } 971 972 static SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) { 973 SDValue LHS = Op.getOperand(0); 974 SDValue RHS = Op.getOperand(1); 975 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get(); 976 SDValue TrueVal = Op.getOperand(2); 977 SDValue FalseVal = Op.getOperand(3); 978 DebugLoc dl = Op.getDebugLoc(); 979 unsigned Opc, SPCC = ~0U; 980 981 // If this is a select_cc of a "setcc", and if the setcc got lowered into 982 // an CMP[IF]CC/SELECT_[IF]CC pair, find the original compared values. 983 LookThroughSetCC(LHS, RHS, CC, SPCC); 984 985 SDValue CompareFlag; 986 if (LHS.getValueType() == MVT::i32) { 987 // subcc returns a value 988 EVT VTs[] = { LHS.getValueType(), MVT::Glue }; 989 SDValue Ops[2] = { LHS, RHS }; 990 CompareFlag = DAG.getNode(SPISD::CMPICC, dl, VTs, Ops, 2).getValue(1); 991 Opc = SPISD::SELECT_ICC; 992 if (SPCC == ~0U) SPCC = IntCondCCodeToICC(CC); 993 } else { 994 CompareFlag = DAG.getNode(SPISD::CMPFCC, dl, MVT::Glue, LHS, RHS); 995 Opc = SPISD::SELECT_FCC; 996 if (SPCC == ~0U) SPCC = FPCondCCodeToFCC(CC); 997 } 998 return DAG.getNode(Opc, dl, TrueVal.getValueType(), TrueVal, FalseVal, 999 DAG.getConstant(SPCC, MVT::i32), CompareFlag); 1000 } 1001 1002 static SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG, 1003 const SparcTargetLowering &TLI) { 1004 MachineFunction &MF = DAG.getMachineFunction(); 1005 SparcMachineFunctionInfo *FuncInfo = MF.getInfo<SparcMachineFunctionInfo>(); 1006 1007 // vastart just stores the address of the VarArgsFrameIndex slot into the 1008 // memory location argument. 1009 DebugLoc dl = Op.getDebugLoc(); 1010 SDValue Offset = 1011 DAG.getNode(ISD::ADD, dl, MVT::i32, 1012 DAG.getRegister(SP::I6, MVT::i32), 1013 DAG.getConstant(FuncInfo->getVarArgsFrameOffset(), 1014 MVT::i32)); 1015 const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue(); 1016 return DAG.getStore(Op.getOperand(0), dl, Offset, Op.getOperand(1), 1017 MachinePointerInfo(SV), false, false, 0); 1018 } 1019 1020 static SDValue LowerVAARG(SDValue Op, SelectionDAG &DAG) { 1021 SDNode *Node = Op.getNode(); 1022 EVT VT = Node->getValueType(0); 1023 SDValue InChain = Node->getOperand(0); 1024 SDValue VAListPtr = Node->getOperand(1); 1025 const Value *SV = cast<SrcValueSDNode>(Node->getOperand(2))->getValue(); 1026 DebugLoc dl = Node->getDebugLoc(); 1027 SDValue VAList = DAG.getLoad(MVT::i32, dl, InChain, VAListPtr, 1028 MachinePointerInfo(SV), false, false, false, 0); 1029 // Increment the pointer, VAList, to the next vaarg 1030 SDValue NextPtr = DAG.getNode(ISD::ADD, dl, MVT::i32, VAList, 1031 DAG.getConstant(VT.getSizeInBits()/8, 1032 MVT::i32)); 1033 // Store the incremented VAList to the legalized pointer 1034 InChain = DAG.getStore(VAList.getValue(1), dl, NextPtr, 1035 VAListPtr, MachinePointerInfo(SV), false, false, 0); 1036 // Load the actual argument out of the pointer VAList, unless this is an 1037 // f64 load. 1038 if (VT != MVT::f64) 1039 return DAG.getLoad(VT, dl, InChain, VAList, MachinePointerInfo(), 1040 false, false, false, 0); 1041 1042 // Otherwise, load it as i64, then do a bitconvert. 1043 SDValue V = DAG.getLoad(MVT::i64, dl, InChain, VAList, MachinePointerInfo(), 1044 false, false, false, 0); 1045 1046 // Bit-Convert the value to f64. 1047 SDValue Ops[2] = { 1048 DAG.getNode(ISD::BITCAST, dl, MVT::f64, V), 1049 V.getValue(1) 1050 }; 1051 return DAG.getMergeValues(Ops, 2, dl); 1052 } 1053 1054 static SDValue LowerDYNAMIC_STACKALLOC(SDValue Op, SelectionDAG &DAG) { 1055 SDValue Chain = Op.getOperand(0); // Legalize the chain. 1056 SDValue Size = Op.getOperand(1); // Legalize the size. 1057 DebugLoc dl = Op.getDebugLoc(); 1058 1059 unsigned SPReg = SP::O6; 1060 SDValue SP = DAG.getCopyFromReg(Chain, dl, SPReg, MVT::i32); 1061 SDValue NewSP = DAG.getNode(ISD::SUB, dl, MVT::i32, SP, Size); // Value 1062 Chain = DAG.getCopyToReg(SP.getValue(1), dl, SPReg, NewSP); // Output chain 1063 1064 // The resultant pointer is actually 16 words from the bottom of the stack, 1065 // to provide a register spill area. 1066 SDValue NewVal = DAG.getNode(ISD::ADD, dl, MVT::i32, NewSP, 1067 DAG.getConstant(96, MVT::i32)); 1068 SDValue Ops[2] = { NewVal, Chain }; 1069 return DAG.getMergeValues(Ops, 2, dl); 1070 } 1071 1072 1073 static SDValue getFLUSHW(SDValue Op, SelectionDAG &DAG) { 1074 DebugLoc dl = Op.getDebugLoc(); 1075 SDValue Chain = DAG.getNode(SPISD::FLUSHW, 1076 dl, MVT::Other, DAG.getEntryNode()); 1077 return Chain; 1078 } 1079 1080 static SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) { 1081 MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo(); 1082 MFI->setFrameAddressIsTaken(true); 1083 1084 EVT VT = Op.getValueType(); 1085 DebugLoc dl = Op.getDebugLoc(); 1086 unsigned FrameReg = SP::I6; 1087 1088 uint64_t depth = Op.getConstantOperandVal(0); 1089 1090 SDValue FrameAddr; 1091 if (depth == 0) 1092 FrameAddr = DAG.getCopyFromReg(DAG.getEntryNode(), dl, FrameReg, VT); 1093 else { 1094 // flush first to make sure the windowed registers' values are in stack 1095 SDValue Chain = getFLUSHW(Op, DAG); 1096 FrameAddr = DAG.getCopyFromReg(Chain, dl, FrameReg, VT); 1097 1098 for (uint64_t i = 0; i != depth; ++i) { 1099 SDValue Ptr = DAG.getNode(ISD::ADD, 1100 dl, MVT::i32, 1101 FrameAddr, DAG.getIntPtrConstant(56)); 1102 FrameAddr = DAG.getLoad(MVT::i32, dl, 1103 Chain, 1104 Ptr, 1105 MachinePointerInfo(), false, false, false, 0); 1106 } 1107 } 1108 return FrameAddr; 1109 } 1110 1111 static SDValue LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) { 1112 MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo(); 1113 MFI->setReturnAddressIsTaken(true); 1114 1115 EVT VT = Op.getValueType(); 1116 DebugLoc dl = Op.getDebugLoc(); 1117 unsigned RetReg = SP::I7; 1118 1119 uint64_t depth = Op.getConstantOperandVal(0); 1120 1121 SDValue RetAddr; 1122 if (depth == 0) 1123 RetAddr = DAG.getCopyFromReg(DAG.getEntryNode(), dl, RetReg, VT); 1124 else { 1125 // flush first to make sure the windowed registers' values are in stack 1126 SDValue Chain = getFLUSHW(Op, DAG); 1127 RetAddr = DAG.getCopyFromReg(Chain, dl, SP::I6, VT); 1128 1129 for (uint64_t i = 0; i != depth; ++i) { 1130 SDValue Ptr = DAG.getNode(ISD::ADD, 1131 dl, MVT::i32, 1132 RetAddr, 1133 DAG.getIntPtrConstant((i == depth-1)?60:56)); 1134 RetAddr = DAG.getLoad(MVT::i32, dl, 1135 Chain, 1136 Ptr, 1137 MachinePointerInfo(), false, false, false, 0); 1138 } 1139 } 1140 return RetAddr; 1141 } 1142 1143 SDValue SparcTargetLowering:: 1144 LowerOperation(SDValue Op, SelectionDAG &DAG) const { 1145 switch (Op.getOpcode()) { 1146 default: llvm_unreachable("Should not custom lower this!"); 1147 case ISD::RETURNADDR: return LowerRETURNADDR(Op, DAG); 1148 case ISD::FRAMEADDR: return LowerFRAMEADDR(Op, DAG); 1149 case ISD::GlobalTLSAddress: 1150 llvm_unreachable("TLS not implemented for Sparc."); 1151 case ISD::GlobalAddress: return LowerGlobalAddress(Op, DAG); 1152 case ISD::ConstantPool: return LowerConstantPool(Op, DAG); 1153 case ISD::FP_TO_SINT: return LowerFP_TO_SINT(Op, DAG); 1154 case ISD::SINT_TO_FP: return LowerSINT_TO_FP(Op, DAG); 1155 case ISD::BR_CC: return LowerBR_CC(Op, DAG); 1156 case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG); 1157 case ISD::VASTART: return LowerVASTART(Op, DAG, *this); 1158 case ISD::VAARG: return LowerVAARG(Op, DAG); 1159 case ISD::DYNAMIC_STACKALLOC: return LowerDYNAMIC_STACKALLOC(Op, DAG); 1160 } 1161 } 1162 1163 MachineBasicBlock * 1164 SparcTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI, 1165 MachineBasicBlock *BB) const { 1166 const TargetInstrInfo &TII = *getTargetMachine().getInstrInfo(); 1167 unsigned BROpcode; 1168 unsigned CC; 1169 DebugLoc dl = MI->getDebugLoc(); 1170 // Figure out the conditional branch opcode to use for this select_cc. 1171 switch (MI->getOpcode()) { 1172 default: llvm_unreachable("Unknown SELECT_CC!"); 1173 case SP::SELECT_CC_Int_ICC: 1174 case SP::SELECT_CC_FP_ICC: 1175 case SP::SELECT_CC_DFP_ICC: 1176 BROpcode = SP::BCOND; 1177 break; 1178 case SP::SELECT_CC_Int_FCC: 1179 case SP::SELECT_CC_FP_FCC: 1180 case SP::SELECT_CC_DFP_FCC: 1181 BROpcode = SP::FBCOND; 1182 break; 1183 } 1184 1185 CC = (SPCC::CondCodes)MI->getOperand(3).getImm(); 1186 1187 // To "insert" a SELECT_CC instruction, we actually have to insert the diamond 1188 // control-flow pattern. The incoming instruction knows the destination vreg 1189 // to set, the condition code register to branch on, the true/false values to 1190 // select between, and a branch opcode to use. 1191 const BasicBlock *LLVM_BB = BB->getBasicBlock(); 1192 MachineFunction::iterator It = BB; 1193 ++It; 1194 1195 // thisMBB: 1196 // ... 1197 // TrueVal = ... 1198 // [f]bCC copy1MBB 1199 // fallthrough --> copy0MBB 1200 MachineBasicBlock *thisMBB = BB; 1201 MachineFunction *F = BB->getParent(); 1202 MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB); 1203 MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB); 1204 F->insert(It, copy0MBB); 1205 F->insert(It, sinkMBB); 1206 1207 // Transfer the remainder of BB and its successor edges to sinkMBB. 1208 sinkMBB->splice(sinkMBB->begin(), BB, 1209 llvm::next(MachineBasicBlock::iterator(MI)), 1210 BB->end()); 1211 sinkMBB->transferSuccessorsAndUpdatePHIs(BB); 1212 1213 // Add the true and fallthrough blocks as its successors. 1214 BB->addSuccessor(copy0MBB); 1215 BB->addSuccessor(sinkMBB); 1216 1217 BuildMI(BB, dl, TII.get(BROpcode)).addMBB(sinkMBB).addImm(CC); 1218 1219 // copy0MBB: 1220 // %FalseValue = ... 1221 // # fallthrough to sinkMBB 1222 BB = copy0MBB; 1223 1224 // Update machine-CFG edges 1225 BB->addSuccessor(sinkMBB); 1226 1227 // sinkMBB: 1228 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ] 1229 // ... 1230 BB = sinkMBB; 1231 BuildMI(*BB, BB->begin(), dl, TII.get(SP::PHI), MI->getOperand(0).getReg()) 1232 .addReg(MI->getOperand(2).getReg()).addMBB(copy0MBB) 1233 .addReg(MI->getOperand(1).getReg()).addMBB(thisMBB); 1234 1235 MI->eraseFromParent(); // The pseudo instruction is gone now. 1236 return BB; 1237 } 1238 1239 //===----------------------------------------------------------------------===// 1240 // Sparc Inline Assembly Support 1241 //===----------------------------------------------------------------------===// 1242 1243 /// getConstraintType - Given a constraint letter, return the type of 1244 /// constraint it is for this target. 1245 SparcTargetLowering::ConstraintType 1246 SparcTargetLowering::getConstraintType(const std::string &Constraint) const { 1247 if (Constraint.size() == 1) { 1248 switch (Constraint[0]) { 1249 default: break; 1250 case 'r': return C_RegisterClass; 1251 } 1252 } 1253 1254 return TargetLowering::getConstraintType(Constraint); 1255 } 1256 1257 std::pair<unsigned, const TargetRegisterClass*> 1258 SparcTargetLowering::getRegForInlineAsmConstraint(const std::string &Constraint, 1259 EVT VT) const { 1260 if (Constraint.size() == 1) { 1261 switch (Constraint[0]) { 1262 case 'r': 1263 return std::make_pair(0U, &SP::IntRegsRegClass); 1264 } 1265 } 1266 1267 return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT); 1268 } 1269 1270 bool 1271 SparcTargetLowering::isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const { 1272 // The Sparc target isn't yet aware of offsets. 1273 return false; 1274 } 1275