1 //===-- MipsSEInstrInfo.cpp - Mips32/64 Instruction Information -----------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains the Mips32/64 implementation of the TargetInstrInfo class.
12 //===----------------------------------------------------------------------===//
14 #include "MipsSEInstrInfo.h"
15 #include "InstPrinter/MipsInstPrinter.h"
16 #include "MipsMachineFunction.h"
17 #include "MipsTargetMachine.h"
18 #include "llvm/ADT/STLExtras.h"
19 #include "llvm/CodeGen/MachineInstrBuilder.h"
20 #include "llvm/CodeGen/MachineRegisterInfo.h"
21 #include "llvm/Support/CommandLine.h"
22 #include "llvm/Support/ErrorHandling.h"
23 #include "llvm/Support/TargetRegistry.h"
27 MipsSEInstrInfo::MipsSEInstrInfo(MipsTargetMachine &tm)
29 tm.getRelocationModel() == Reloc::PIC_ ? Mips::B : Mips::J),
30 RI(*tm.getSubtargetImpl()),
31 IsN64(tm.getSubtarget<MipsSubtarget>().isABI_N64()) {}
33 const MipsRegisterInfo &MipsSEInstrInfo::getRegisterInfo() const {
37 /// isLoadFromStackSlot - If the specified machine instruction is a direct
38 /// load from a stack slot, return the virtual or physical register number of
39 /// the destination along with the FrameIndex of the loaded stack slot. If
40 /// not, return 0. This predicate must return 0 if the instruction has
41 /// any side effects other than loading from the stack slot.
42 unsigned MipsSEInstrInfo::
43 isLoadFromStackSlot(const MachineInstr *MI, int &FrameIndex) const
45 unsigned Opc = MI->getOpcode();
47 if ((Opc == Mips::LW) || (Opc == Mips::LD) ||
48 (Opc == Mips::LWC1) || (Opc == Mips::LDC1) || (Opc == Mips::LDC164)) {
49 if ((MI->getOperand(1).isFI()) && // is a stack slot
50 (MI->getOperand(2).isImm()) && // the imm is zero
51 (isZeroImm(MI->getOperand(2)))) {
52 FrameIndex = MI->getOperand(1).getIndex();
53 return MI->getOperand(0).getReg();
60 /// isStoreToStackSlot - If the specified machine instruction is a direct
61 /// store to a stack slot, return the virtual or physical register number of
62 /// the source reg along with the FrameIndex of the loaded stack slot. If
63 /// not, return 0. This predicate must return 0 if the instruction has
64 /// any side effects other than storing to the stack slot.
65 unsigned MipsSEInstrInfo::
66 isStoreToStackSlot(const MachineInstr *MI, int &FrameIndex) const
68 unsigned Opc = MI->getOpcode();
70 if ((Opc == Mips::SW) || (Opc == Mips::SD) ||
71 (Opc == Mips::SWC1) || (Opc == Mips::SDC1) || (Opc == Mips::SDC164)) {
72 if ((MI->getOperand(1).isFI()) && // is a stack slot
73 (MI->getOperand(2).isImm()) && // the imm is zero
74 (isZeroImm(MI->getOperand(2)))) {
75 FrameIndex = MI->getOperand(1).getIndex();
76 return MI->getOperand(0).getReg();
82 void MipsSEInstrInfo::copyPhysReg(MachineBasicBlock &MBB,
83 MachineBasicBlock::iterator I, DebugLoc DL,
84 unsigned DestReg, unsigned SrcReg,
86 unsigned Opc = 0, ZeroReg = 0;
87 bool isMicroMips = TM.getSubtarget<MipsSubtarget>().inMicroMipsMode();
89 if (Mips::GPR32RegClass.contains(DestReg)) { // Copy to CPU Reg.
90 if (Mips::GPR32RegClass.contains(SrcReg)) {
92 Opc = Mips::MOVE16_MM;
94 Opc = Mips::ADDu, ZeroReg = Mips::ZERO;
95 } else if (Mips::CCRRegClass.contains(SrcReg))
97 else if (Mips::FGR32RegClass.contains(SrcReg))
99 else if (Mips::HI32RegClass.contains(SrcReg))
100 Opc = Mips::MFHI, SrcReg = 0;
101 else if (Mips::LO32RegClass.contains(SrcReg))
102 Opc = Mips::MFLO, SrcReg = 0;
103 else if (Mips::HI32DSPRegClass.contains(SrcReg))
104 Opc = Mips::MFHI_DSP;
105 else if (Mips::LO32DSPRegClass.contains(SrcReg))
106 Opc = Mips::MFLO_DSP;
107 else if (Mips::DSPCCRegClass.contains(SrcReg)) {
108 BuildMI(MBB, I, DL, get(Mips::RDDSP), DestReg).addImm(1 << 4)
109 .addReg(SrcReg, RegState::Implicit | getKillRegState(KillSrc));
112 else if (Mips::MSACtrlRegClass.contains(SrcReg))
115 else if (Mips::GPR32RegClass.contains(SrcReg)) { // Copy from CPU Reg.
116 if (Mips::CCRRegClass.contains(DestReg))
118 else if (Mips::FGR32RegClass.contains(DestReg))
120 else if (Mips::HI32RegClass.contains(DestReg))
121 Opc = Mips::MTHI, DestReg = 0;
122 else if (Mips::LO32RegClass.contains(DestReg))
123 Opc = Mips::MTLO, DestReg = 0;
124 else if (Mips::HI32DSPRegClass.contains(DestReg))
125 Opc = Mips::MTHI_DSP;
126 else if (Mips::LO32DSPRegClass.contains(DestReg))
127 Opc = Mips::MTLO_DSP;
128 else if (Mips::DSPCCRegClass.contains(DestReg)) {
129 BuildMI(MBB, I, DL, get(Mips::WRDSP))
130 .addReg(SrcReg, getKillRegState(KillSrc)).addImm(1 << 4)
131 .addReg(DestReg, RegState::ImplicitDefine);
134 else if (Mips::MSACtrlRegClass.contains(DestReg))
137 else if (Mips::FGR32RegClass.contains(DestReg, SrcReg))
139 else if (Mips::AFGR64RegClass.contains(DestReg, SrcReg))
140 Opc = Mips::FMOV_D32;
141 else if (Mips::FGR64RegClass.contains(DestReg, SrcReg))
142 Opc = Mips::FMOV_D64;
143 else if (Mips::GPR64RegClass.contains(DestReg)) { // Copy to CPU64 Reg.
144 if (Mips::GPR64RegClass.contains(SrcReg))
145 Opc = Mips::DADDu, ZeroReg = Mips::ZERO_64;
146 else if (Mips::HI64RegClass.contains(SrcReg))
147 Opc = Mips::MFHI64, SrcReg = 0;
148 else if (Mips::LO64RegClass.contains(SrcReg))
149 Opc = Mips::MFLO64, SrcReg = 0;
150 else if (Mips::FGR64RegClass.contains(SrcReg))
153 else if (Mips::GPR64RegClass.contains(SrcReg)) { // Copy from CPU64 Reg.
154 if (Mips::HI64RegClass.contains(DestReg))
155 Opc = Mips::MTHI64, DestReg = 0;
156 else if (Mips::LO64RegClass.contains(DestReg))
157 Opc = Mips::MTLO64, DestReg = 0;
158 else if (Mips::FGR64RegClass.contains(DestReg))
161 else if (Mips::MSA128BRegClass.contains(DestReg)) { // Copy to MSA reg
162 if (Mips::MSA128BRegClass.contains(SrcReg))
166 assert(Opc && "Cannot copy registers");
168 MachineInstrBuilder MIB = BuildMI(MBB, I, DL, get(Opc));
171 MIB.addReg(DestReg, RegState::Define);
174 MIB.addReg(SrcReg, getKillRegState(KillSrc));
180 void MipsSEInstrInfo::
181 storeRegToStack(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
182 unsigned SrcReg, bool isKill, int FI,
183 const TargetRegisterClass *RC, const TargetRegisterInfo *TRI,
184 int64_t Offset) const {
186 if (I != MBB.end()) DL = I->getDebugLoc();
187 MachineMemOperand *MMO = GetMemOperand(MBB, FI, MachineMemOperand::MOStore);
191 if (Mips::GPR32RegClass.hasSubClassEq(RC))
193 else if (Mips::GPR64RegClass.hasSubClassEq(RC))
195 else if (Mips::ACC64RegClass.hasSubClassEq(RC))
196 Opc = Mips::STORE_ACC64;
197 else if (Mips::ACC64DSPRegClass.hasSubClassEq(RC))
198 Opc = Mips::STORE_ACC64DSP;
199 else if (Mips::ACC128RegClass.hasSubClassEq(RC))
200 Opc = Mips::STORE_ACC128;
201 else if (Mips::DSPCCRegClass.hasSubClassEq(RC))
202 Opc = Mips::STORE_CCOND_DSP;
203 else if (Mips::FGR32RegClass.hasSubClassEq(RC))
205 else if (Mips::AFGR64RegClass.hasSubClassEq(RC))
207 else if (Mips::FGR64RegClass.hasSubClassEq(RC))
209 else if (RC->hasType(MVT::v16i8))
211 else if (RC->hasType(MVT::v8i16) || RC->hasType(MVT::v8f16))
213 else if (RC->hasType(MVT::v4i32) || RC->hasType(MVT::v4f32))
215 else if (RC->hasType(MVT::v2i64) || RC->hasType(MVT::v2f64))
218 assert(Opc && "Register class not handled!");
219 BuildMI(MBB, I, DL, get(Opc)).addReg(SrcReg, getKillRegState(isKill))
220 .addFrameIndex(FI).addImm(Offset).addMemOperand(MMO);
223 void MipsSEInstrInfo::
224 loadRegFromStack(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
225 unsigned DestReg, int FI, const TargetRegisterClass *RC,
226 const TargetRegisterInfo *TRI, int64_t Offset) const {
228 if (I != MBB.end()) DL = I->getDebugLoc();
229 MachineMemOperand *MMO = GetMemOperand(MBB, FI, MachineMemOperand::MOLoad);
232 if (Mips::GPR32RegClass.hasSubClassEq(RC))
234 else if (Mips::GPR64RegClass.hasSubClassEq(RC))
236 else if (Mips::ACC64RegClass.hasSubClassEq(RC))
237 Opc = Mips::LOAD_ACC64;
238 else if (Mips::ACC64DSPRegClass.hasSubClassEq(RC))
239 Opc = Mips::LOAD_ACC64DSP;
240 else if (Mips::ACC128RegClass.hasSubClassEq(RC))
241 Opc = Mips::LOAD_ACC128;
242 else if (Mips::DSPCCRegClass.hasSubClassEq(RC))
243 Opc = Mips::LOAD_CCOND_DSP;
244 else if (Mips::FGR32RegClass.hasSubClassEq(RC))
246 else if (Mips::AFGR64RegClass.hasSubClassEq(RC))
248 else if (Mips::FGR64RegClass.hasSubClassEq(RC))
250 else if (RC->hasType(MVT::v16i8))
252 else if (RC->hasType(MVT::v8i16) || RC->hasType(MVT::v8f16))
254 else if (RC->hasType(MVT::v4i32) || RC->hasType(MVT::v4f32))
256 else if (RC->hasType(MVT::v2i64) || RC->hasType(MVT::v2f64))
259 assert(Opc && "Register class not handled!");
260 BuildMI(MBB, I, DL, get(Opc), DestReg).addFrameIndex(FI).addImm(Offset)
264 bool MipsSEInstrInfo::expandPostRAPseudo(MachineBasicBlock::iterator MI) const {
265 MachineBasicBlock &MBB = *MI->getParent();
267 switch(MI->getDesc().getOpcode()) {
271 expandRetRA(MBB, MI, Mips::RET);
273 case Mips::PseudoMFHI:
274 expandPseudoMFHiLo(MBB, MI, Mips::MFHI);
276 case Mips::PseudoMFLO:
277 expandPseudoMFHiLo(MBB, MI, Mips::MFLO);
279 case Mips::PseudoMFHI64:
280 expandPseudoMFHiLo(MBB, MI, Mips::MFHI64);
282 case Mips::PseudoMFLO64:
283 expandPseudoMFHiLo(MBB, MI, Mips::MFLO64);
285 case Mips::PseudoMTLOHI:
286 expandPseudoMTLoHi(MBB, MI, Mips::MTLO, Mips::MTHI, false);
288 case Mips::PseudoMTLOHI64:
289 expandPseudoMTLoHi(MBB, MI, Mips::MTLO64, Mips::MTHI64, false);
291 case Mips::PseudoMTLOHI_DSP:
292 expandPseudoMTLoHi(MBB, MI, Mips::MTLO_DSP, Mips::MTHI_DSP, true);
294 case Mips::PseudoCVT_S_W:
295 expandCvtFPInt(MBB, MI, Mips::CVT_S_W, Mips::MTC1, false);
297 case Mips::PseudoCVT_D32_W:
298 expandCvtFPInt(MBB, MI, Mips::CVT_D32_W, Mips::MTC1, false);
300 case Mips::PseudoCVT_S_L:
301 expandCvtFPInt(MBB, MI, Mips::CVT_S_L, Mips::DMTC1, true);
303 case Mips::PseudoCVT_D64_W:
304 expandCvtFPInt(MBB, MI, Mips::CVT_D64_W, Mips::MTC1, true);
306 case Mips::PseudoCVT_D64_L:
307 expandCvtFPInt(MBB, MI, Mips::CVT_D64_L, Mips::DMTC1, true);
309 case Mips::BuildPairF64:
310 expandBuildPairF64(MBB, MI, false);
312 case Mips::BuildPairF64_64:
313 expandBuildPairF64(MBB, MI, true);
315 case Mips::ExtractElementF64:
316 expandExtractElementF64(MBB, MI, false);
318 case Mips::ExtractElementF64_64:
319 expandExtractElementF64(MBB, MI, true);
321 case Mips::MIPSeh_return32:
322 case Mips::MIPSeh_return64:
323 expandEhReturn(MBB, MI);
331 /// getOppositeBranchOpc - Return the inverse of the specified
332 /// opcode, e.g. turning BEQ to BNE.
333 unsigned MipsSEInstrInfo::getOppositeBranchOpc(unsigned Opc) const {
335 default: llvm_unreachable("Illegal opcode!");
336 case Mips::BEQ: return Mips::BNE;
337 case Mips::BNE: return Mips::BEQ;
338 case Mips::BGTZ: return Mips::BLEZ;
339 case Mips::BGEZ: return Mips::BLTZ;
340 case Mips::BLTZ: return Mips::BGEZ;
341 case Mips::BLEZ: return Mips::BGTZ;
342 case Mips::BEQ64: return Mips::BNE64;
343 case Mips::BNE64: return Mips::BEQ64;
344 case Mips::BGTZ64: return Mips::BLEZ64;
345 case Mips::BGEZ64: return Mips::BLTZ64;
346 case Mips::BLTZ64: return Mips::BGEZ64;
347 case Mips::BLEZ64: return Mips::BGTZ64;
348 case Mips::BC1T: return Mips::BC1F;
349 case Mips::BC1F: return Mips::BC1T;
353 /// Adjust SP by Amount bytes.
354 void MipsSEInstrInfo::adjustStackPtr(unsigned SP, int64_t Amount,
355 MachineBasicBlock &MBB,
356 MachineBasicBlock::iterator I) const {
357 const MipsSubtarget &STI = TM.getSubtarget<MipsSubtarget>();
358 DebugLoc DL = I != MBB.end() ? I->getDebugLoc() : DebugLoc();
359 unsigned ADDu = STI.isABI_N64() ? Mips::DADDu : Mips::ADDu;
360 unsigned ADDiu = STI.isABI_N64() ? Mips::DADDiu : Mips::ADDiu;
362 if (isInt<16>(Amount))// addi sp, sp, amount
363 BuildMI(MBB, I, DL, get(ADDiu), SP).addReg(SP).addImm(Amount);
364 else { // Expand immediate that doesn't fit in 16-bit.
365 unsigned Reg = loadImmediate(Amount, MBB, I, DL, 0);
366 BuildMI(MBB, I, DL, get(ADDu), SP).addReg(SP).addReg(Reg, RegState::Kill);
370 /// This function generates the sequence of instructions needed to get the
371 /// result of adding register REG and immediate IMM.
373 MipsSEInstrInfo::loadImmediate(int64_t Imm, MachineBasicBlock &MBB,
374 MachineBasicBlock::iterator II, DebugLoc DL,
375 unsigned *NewImm) const {
376 MipsAnalyzeImmediate AnalyzeImm;
377 const MipsSubtarget &STI = TM.getSubtarget<MipsSubtarget>();
378 MachineRegisterInfo &RegInfo = MBB.getParent()->getRegInfo();
379 unsigned Size = STI.isABI_N64() ? 64 : 32;
380 unsigned LUi = STI.isABI_N64() ? Mips::LUi64 : Mips::LUi;
381 unsigned ZEROReg = STI.isABI_N64() ? Mips::ZERO_64 : Mips::ZERO;
382 const TargetRegisterClass *RC = STI.isABI_N64() ?
383 &Mips::GPR64RegClass : &Mips::GPR32RegClass;
384 bool LastInstrIsADDiu = NewImm;
386 const MipsAnalyzeImmediate::InstSeq &Seq =
387 AnalyzeImm.Analyze(Imm, Size, LastInstrIsADDiu);
388 MipsAnalyzeImmediate::InstSeq::const_iterator Inst = Seq.begin();
390 assert(Seq.size() && (!LastInstrIsADDiu || (Seq.size() > 1)));
392 // The first instruction can be a LUi, which is different from other
393 // instructions (ADDiu, ORI and SLL) in that it does not have a register
395 unsigned Reg = RegInfo.createVirtualRegister(RC);
397 if (Inst->Opc == LUi)
398 BuildMI(MBB, II, DL, get(LUi), Reg).addImm(SignExtend64<16>(Inst->ImmOpnd));
400 BuildMI(MBB, II, DL, get(Inst->Opc), Reg).addReg(ZEROReg)
401 .addImm(SignExtend64<16>(Inst->ImmOpnd));
403 // Build the remaining instructions in Seq.
404 for (++Inst; Inst != Seq.end() - LastInstrIsADDiu; ++Inst)
405 BuildMI(MBB, II, DL, get(Inst->Opc), Reg).addReg(Reg, RegState::Kill)
406 .addImm(SignExtend64<16>(Inst->ImmOpnd));
408 if (LastInstrIsADDiu)
409 *NewImm = Inst->ImmOpnd;
414 unsigned MipsSEInstrInfo::getAnalyzableBrOpc(unsigned Opc) const {
415 return (Opc == Mips::BEQ || Opc == Mips::BNE || Opc == Mips::BGTZ ||
416 Opc == Mips::BGEZ || Opc == Mips::BLTZ || Opc == Mips::BLEZ ||
417 Opc == Mips::BEQ64 || Opc == Mips::BNE64 || Opc == Mips::BGTZ64 ||
418 Opc == Mips::BGEZ64 || Opc == Mips::BLTZ64 || Opc == Mips::BLEZ64 ||
419 Opc == Mips::BC1T || Opc == Mips::BC1F || Opc == Mips::B ||
424 void MipsSEInstrInfo::expandRetRA(MachineBasicBlock &MBB,
425 MachineBasicBlock::iterator I,
426 unsigned Opc) const {
427 BuildMI(MBB, I, I->getDebugLoc(), get(Opc)).addReg(Mips::RA);
430 std::pair<bool, bool>
431 MipsSEInstrInfo::compareOpndSize(unsigned Opc,
432 const MachineFunction &MF) const {
433 const MCInstrDesc &Desc = get(Opc);
434 assert(Desc.NumOperands == 2 && "Unary instruction expected.");
435 const MipsRegisterInfo *RI = &getRegisterInfo();
436 unsigned DstRegSize = getRegClass(Desc, 0, RI, MF)->getSize();
437 unsigned SrcRegSize = getRegClass(Desc, 1, RI, MF)->getSize();
439 return std::make_pair(DstRegSize > SrcRegSize, DstRegSize < SrcRegSize);
442 void MipsSEInstrInfo::expandPseudoMFHiLo(MachineBasicBlock &MBB,
443 MachineBasicBlock::iterator I,
444 unsigned NewOpc) const {
445 BuildMI(MBB, I, I->getDebugLoc(), get(NewOpc), I->getOperand(0).getReg());
448 void MipsSEInstrInfo::expandPseudoMTLoHi(MachineBasicBlock &MBB,
449 MachineBasicBlock::iterator I,
452 bool HasExplicitDef) const {
454 // lo_hi pseudomtlohi $gpr0, $gpr1
455 // to these two instructions:
459 DebugLoc DL = I->getDebugLoc();
460 const MachineOperand &SrcLo = I->getOperand(1), &SrcHi = I->getOperand(2);
461 MachineInstrBuilder LoInst = BuildMI(MBB, I, DL, get(LoOpc));
462 MachineInstrBuilder HiInst = BuildMI(MBB, I, DL, get(HiOpc));
463 LoInst.addReg(SrcLo.getReg(), getKillRegState(SrcLo.isKill()));
464 HiInst.addReg(SrcHi.getReg(), getKillRegState(SrcHi.isKill()));
466 // Add lo/hi registers if the mtlo/hi instructions created have explicit
468 if (HasExplicitDef) {
469 unsigned DstReg = I->getOperand(0).getReg();
470 unsigned DstLo = getRegisterInfo().getSubReg(DstReg, Mips::sub_lo);
471 unsigned DstHi = getRegisterInfo().getSubReg(DstReg, Mips::sub_hi);
472 LoInst.addReg(DstLo, RegState::Define);
473 HiInst.addReg(DstHi, RegState::Define);
477 void MipsSEInstrInfo::expandCvtFPInt(MachineBasicBlock &MBB,
478 MachineBasicBlock::iterator I,
479 unsigned CvtOpc, unsigned MovOpc,
481 const MCInstrDesc &CvtDesc = get(CvtOpc), &MovDesc = get(MovOpc);
482 const MachineOperand &Dst = I->getOperand(0), &Src = I->getOperand(1);
483 unsigned DstReg = Dst.getReg(), SrcReg = Src.getReg(), TmpReg = DstReg;
484 unsigned KillSrc = getKillRegState(Src.isKill());
485 DebugLoc DL = I->getDebugLoc();
486 bool DstIsLarger, SrcIsLarger;
488 std::tie(DstIsLarger, SrcIsLarger) =
489 compareOpndSize(CvtOpc, *MBB.getParent());
492 TmpReg = getRegisterInfo().getSubReg(DstReg, Mips::sub_lo);
495 DstReg = getRegisterInfo().getSubReg(DstReg, Mips::sub_lo);
497 BuildMI(MBB, I, DL, MovDesc, TmpReg).addReg(SrcReg, KillSrc);
498 BuildMI(MBB, I, DL, CvtDesc, DstReg).addReg(TmpReg, RegState::Kill);
501 void MipsSEInstrInfo::expandExtractElementF64(MachineBasicBlock &MBB,
502 MachineBasicBlock::iterator I,
504 unsigned DstReg = I->getOperand(0).getReg();
505 unsigned SrcReg = I->getOperand(1).getReg();
506 unsigned N = I->getOperand(2).getImm();
507 DebugLoc dl = I->getDebugLoc();
509 assert(N < 2 && "Invalid immediate");
510 unsigned SubIdx = N ? Mips::sub_hi : Mips::sub_lo;
511 unsigned SubReg = getRegisterInfo().getSubReg(SrcReg, SubIdx);
513 if (SubIdx == Mips::sub_hi && FP64) {
514 // FIXME: The .addReg(SrcReg, RegState::Implicit) is a white lie used to
515 // temporarily work around a widespread bug in the -mfp64 support.
516 // The problem is that none of the 32-bit fpu ops mention the fact
517 // that they clobber the upper 32-bits of the 64-bit FPR. Fixing that
518 // requires a major overhaul of the FPU implementation which can't
519 // be done right now due to time constraints.
520 // MFHC1 is one of two instructions that are affected since they are
521 // the only instructions that don't read the lower 32-bits.
522 // We therefore pretend that it reads the bottom 32-bits to
523 // artificially create a dependency and prevent the scheduler
524 // changing the behaviour of the code.
525 BuildMI(MBB, I, dl, get(Mips::MFHC1), DstReg).addReg(SubReg).addReg(
526 SrcReg, RegState::Implicit);
528 BuildMI(MBB, I, dl, get(Mips::MFC1), DstReg).addReg(SubReg);
531 void MipsSEInstrInfo::expandBuildPairF64(MachineBasicBlock &MBB,
532 MachineBasicBlock::iterator I,
534 unsigned DstReg = I->getOperand(0).getReg();
535 unsigned LoReg = I->getOperand(1).getReg(), HiReg = I->getOperand(2).getReg();
536 const MCInstrDesc& Mtc1Tdd = get(Mips::MTC1);
537 DebugLoc dl = I->getDebugLoc();
538 const TargetRegisterInfo &TRI = getRegisterInfo();
547 BuildMI(MBB, I, dl, Mtc1Tdd, TRI.getSubReg(DstReg, Mips::sub_lo))
551 // FIXME: The .addReg(DstReg, RegState::Implicit) is a white lie used to
552 // temporarily work around a widespread bug in the -mfp64 support.
553 // The problem is that none of the 32-bit fpu ops mention the fact
554 // that they clobber the upper 32-bits of the 64-bit FPR. Fixing that
555 // requires a major overhaul of the FPU implementation which can't
556 // be done right now due to time constraints.
557 // MTHC1 is one of two instructions that are affected since they are
558 // the only instructions that don't read the lower 32-bits.
559 // We therefore pretend that it reads the bottom 32-bits to
560 // artificially create a dependency and prevent the scheduler
561 // changing the behaviour of the code.
562 BuildMI(MBB, I, dl, get(Mips::MTHC1), TRI.getSubReg(DstReg, Mips::sub_hi))
564 .addReg(DstReg, RegState::Implicit);
566 BuildMI(MBB, I, dl, Mtc1Tdd, TRI.getSubReg(DstReg, Mips::sub_hi))
570 void MipsSEInstrInfo::expandEhReturn(MachineBasicBlock &MBB,
571 MachineBasicBlock::iterator I) const {
572 // This pseudo instruction is generated as part of the lowering of
573 // ISD::EH_RETURN. We convert it to a stack increment by OffsetReg, and
574 // indirect jump to TargetReg
575 const MipsSubtarget &STI = TM.getSubtarget<MipsSubtarget>();
576 unsigned ADDU = STI.isABI_N64() ? Mips::DADDu : Mips::ADDu;
577 unsigned JR = STI.isABI_N64() ? Mips::JR64 : Mips::JR;
578 unsigned SP = STI.isABI_N64() ? Mips::SP_64 : Mips::SP;
579 unsigned RA = STI.isABI_N64() ? Mips::RA_64 : Mips::RA;
580 unsigned T9 = STI.isABI_N64() ? Mips::T9_64 : Mips::T9;
581 unsigned ZERO = STI.isABI_N64() ? Mips::ZERO_64 : Mips::ZERO;
582 unsigned OffsetReg = I->getOperand(0).getReg();
583 unsigned TargetReg = I->getOperand(1).getReg();
585 // addu $ra, $v0, $zero
586 // addu $sp, $sp, $v1
588 if (TM.getRelocationModel() == Reloc::PIC_)
589 BuildMI(MBB, I, I->getDebugLoc(), TM.getInstrInfo()->get(ADDU), T9)
590 .addReg(TargetReg).addReg(ZERO);
591 BuildMI(MBB, I, I->getDebugLoc(), TM.getInstrInfo()->get(ADDU), RA)
592 .addReg(TargetReg).addReg(ZERO);
593 BuildMI(MBB, I, I->getDebugLoc(), TM.getInstrInfo()->get(ADDU), SP)
594 .addReg(SP).addReg(OffsetReg);
595 BuildMI(MBB, I, I->getDebugLoc(), TM.getInstrInfo()->get(JR)).addReg(RA);
598 const MipsInstrInfo *llvm::createMipsSEInstrInfo(MipsTargetMachine &TM) {
599 return new MipsSEInstrInfo(TM);