1 //===- PPCInstrInfo.cpp - PowerPC32 Instruction Information -----*- C++ -*-===//
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 PowerPC implementation of the TargetInstrInfo class.
12 //===----------------------------------------------------------------------===//
14 #include "PPCInstrInfo.h"
15 #include "PPCInstrBuilder.h"
16 #include "PPCMachineFunctionInfo.h"
17 #include "PPCPredicates.h"
18 #include "PPCGenInstrInfo.inc"
19 #include "PPCTargetMachine.h"
20 #include "llvm/ADT/STLExtras.h"
21 #include "llvm/CodeGen/MachineInstrBuilder.h"
22 #include "llvm/Support/CommandLine.h"
23 #include "llvm/Target/TargetAsmInfo.h"
26 extern cl::opt<bool> EnablePPC32RS; // FIXME (64-bit): See PPCRegisterInfo.cpp.
27 extern cl::opt<bool> EnablePPC64RS; // FIXME (64-bit): See PPCRegisterInfo.cpp.
29 PPCInstrInfo::PPCInstrInfo(PPCTargetMachine &tm)
30 : TargetInstrInfoImpl(PPCInsts, array_lengthof(PPCInsts)), TM(tm),
31 RI(*TM.getSubtargetImpl(), *this) {}
33 bool PPCInstrInfo::isMoveInstr(const MachineInstr& MI,
36 unsigned& sourceSubIdx,
37 unsigned& destSubIdx) const {
38 sourceSubIdx = destSubIdx = 0; // No sub-registers.
40 unsigned oc = MI.getOpcode();
41 if (oc == PPC::OR || oc == PPC::OR8 || oc == PPC::VOR ||
42 oc == PPC::OR4To8 || oc == PPC::OR8To4) { // or r1, r2, r2
43 assert(MI.getNumOperands() >= 3 &&
44 MI.getOperand(0).isReg() &&
45 MI.getOperand(1).isReg() &&
46 MI.getOperand(2).isReg() &&
47 "invalid PPC OR instruction!");
48 if (MI.getOperand(1).getReg() == MI.getOperand(2).getReg()) {
49 sourceReg = MI.getOperand(1).getReg();
50 destReg = MI.getOperand(0).getReg();
53 } else if (oc == PPC::ADDI) { // addi r1, r2, 0
54 assert(MI.getNumOperands() >= 3 &&
55 MI.getOperand(0).isReg() &&
56 MI.getOperand(2).isImm() &&
57 "invalid PPC ADDI instruction!");
58 if (MI.getOperand(1).isReg() && MI.getOperand(2).getImm() == 0) {
59 sourceReg = MI.getOperand(1).getReg();
60 destReg = MI.getOperand(0).getReg();
63 } else if (oc == PPC::ORI) { // ori r1, r2, 0
64 assert(MI.getNumOperands() >= 3 &&
65 MI.getOperand(0).isReg() &&
66 MI.getOperand(1).isReg() &&
67 MI.getOperand(2).isImm() &&
68 "invalid PPC ORI instruction!");
69 if (MI.getOperand(2).getImm() == 0) {
70 sourceReg = MI.getOperand(1).getReg();
71 destReg = MI.getOperand(0).getReg();
74 } else if (oc == PPC::FMRS || oc == PPC::FMRD ||
75 oc == PPC::FMRSD) { // fmr r1, r2
76 assert(MI.getNumOperands() >= 2 &&
77 MI.getOperand(0).isReg() &&
78 MI.getOperand(1).isReg() &&
79 "invalid PPC FMR instruction");
80 sourceReg = MI.getOperand(1).getReg();
81 destReg = MI.getOperand(0).getReg();
83 } else if (oc == PPC::MCRF) { // mcrf cr1, cr2
84 assert(MI.getNumOperands() >= 2 &&
85 MI.getOperand(0).isReg() &&
86 MI.getOperand(1).isReg() &&
87 "invalid PPC MCRF instruction");
88 sourceReg = MI.getOperand(1).getReg();
89 destReg = MI.getOperand(0).getReg();
95 unsigned PPCInstrInfo::isLoadFromStackSlot(const MachineInstr *MI,
96 int &FrameIndex) const {
97 switch (MI->getOpcode()) {
103 if (MI->getOperand(1).isImm() && !MI->getOperand(1).getImm() &&
104 MI->getOperand(2).isFI()) {
105 FrameIndex = MI->getOperand(2).getIndex();
106 return MI->getOperand(0).getReg();
113 unsigned PPCInstrInfo::isStoreToStackSlot(const MachineInstr *MI,
114 int &FrameIndex) const {
115 switch (MI->getOpcode()) {
121 if (MI->getOperand(1).isImm() && !MI->getOperand(1).getImm() &&
122 MI->getOperand(2).isFI()) {
123 FrameIndex = MI->getOperand(2).getIndex();
124 return MI->getOperand(0).getReg();
131 // commuteInstruction - We can commute rlwimi instructions, but only if the
132 // rotate amt is zero. We also have to munge the immediates a bit.
134 PPCInstrInfo::commuteInstruction(MachineInstr *MI, bool NewMI) const {
135 MachineFunction &MF = *MI->getParent()->getParent();
137 // Normal instructions can be commuted the obvious way.
138 if (MI->getOpcode() != PPC::RLWIMI)
139 return TargetInstrInfoImpl::commuteInstruction(MI, NewMI);
141 // Cannot commute if it has a non-zero rotate count.
142 if (MI->getOperand(3).getImm() != 0)
145 // If we have a zero rotate count, we have:
147 // Op0 = (Op1 & ~M) | (Op2 & M)
149 // M = mask((ME+1)&31, (MB-1)&31)
150 // Op0 = (Op2 & ~M) | (Op1 & M)
153 unsigned Reg0 = MI->getOperand(0).getReg();
154 unsigned Reg1 = MI->getOperand(1).getReg();
155 unsigned Reg2 = MI->getOperand(2).getReg();
156 bool Reg1IsKill = MI->getOperand(1).isKill();
157 bool Reg2IsKill = MI->getOperand(2).isKill();
158 bool ChangeReg0 = false;
159 // If machine instrs are no longer in two-address forms, update
160 // destination register as well.
162 // Must be two address instruction!
163 assert(MI->getDesc().getOperandConstraint(0, TOI::TIED_TO) &&
164 "Expecting a two-address instruction!");
170 unsigned MB = MI->getOperand(4).getImm();
171 unsigned ME = MI->getOperand(5).getImm();
174 // Create a new instruction.
175 unsigned Reg0 = ChangeReg0 ? Reg2 : MI->getOperand(0).getReg();
176 bool Reg0IsDead = MI->getOperand(0).isDead();
177 return BuildMI(MF, MI->getDesc())
178 .addReg(Reg0, true, false, false, Reg0IsDead)
179 .addReg(Reg2, false, false, Reg2IsKill)
180 .addReg(Reg1, false, false, Reg1IsKill)
182 .addImm((MB-1) & 31);
186 MI->getOperand(0).setReg(Reg2);
187 MI->getOperand(2).setReg(Reg1);
188 MI->getOperand(1).setReg(Reg2);
189 MI->getOperand(2).setIsKill(Reg1IsKill);
190 MI->getOperand(1).setIsKill(Reg2IsKill);
192 // Swap the mask around.
193 MI->getOperand(4).setImm((ME+1) & 31);
194 MI->getOperand(5).setImm((MB-1) & 31);
198 void PPCInstrInfo::insertNoop(MachineBasicBlock &MBB,
199 MachineBasicBlock::iterator MI) const {
200 BuildMI(MBB, MI, get(PPC::NOP));
205 bool PPCInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,MachineBasicBlock *&TBB,
206 MachineBasicBlock *&FBB,
207 SmallVectorImpl<MachineOperand> &Cond) const {
208 // If the block has no terminators, it just falls into the block after it.
209 MachineBasicBlock::iterator I = MBB.end();
210 if (I == MBB.begin() || !isUnpredicatedTerminator(--I))
213 // Get the last instruction in the block.
214 MachineInstr *LastInst = I;
216 // If there is only one terminator instruction, process it.
217 if (I == MBB.begin() || !isUnpredicatedTerminator(--I)) {
218 if (LastInst->getOpcode() == PPC::B) {
219 TBB = LastInst->getOperand(0).getMBB();
221 } else if (LastInst->getOpcode() == PPC::BCC) {
222 // Block ends with fall-through condbranch.
223 TBB = LastInst->getOperand(2).getMBB();
224 Cond.push_back(LastInst->getOperand(0));
225 Cond.push_back(LastInst->getOperand(1));
228 // Otherwise, don't know what this is.
232 // Get the instruction before it if it's a terminator.
233 MachineInstr *SecondLastInst = I;
235 // If there are three terminators, we don't know what sort of block this is.
236 if (SecondLastInst && I != MBB.begin() &&
237 isUnpredicatedTerminator(--I))
240 // If the block ends with PPC::B and PPC:BCC, handle it.
241 if (SecondLastInst->getOpcode() == PPC::BCC &&
242 LastInst->getOpcode() == PPC::B) {
243 TBB = SecondLastInst->getOperand(2).getMBB();
244 Cond.push_back(SecondLastInst->getOperand(0));
245 Cond.push_back(SecondLastInst->getOperand(1));
246 FBB = LastInst->getOperand(0).getMBB();
250 // If the block ends with two PPC:Bs, handle it. The second one is not
251 // executed, so remove it.
252 if (SecondLastInst->getOpcode() == PPC::B &&
253 LastInst->getOpcode() == PPC::B) {
254 TBB = SecondLastInst->getOperand(0).getMBB();
256 I->eraseFromParent();
260 // Otherwise, can't handle this.
264 unsigned PPCInstrInfo::RemoveBranch(MachineBasicBlock &MBB) const {
265 MachineBasicBlock::iterator I = MBB.end();
266 if (I == MBB.begin()) return 0;
268 if (I->getOpcode() != PPC::B && I->getOpcode() != PPC::BCC)
271 // Remove the branch.
272 I->eraseFromParent();
276 if (I == MBB.begin()) return 1;
278 if (I->getOpcode() != PPC::BCC)
281 // Remove the branch.
282 I->eraseFromParent();
287 PPCInstrInfo::InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
288 MachineBasicBlock *FBB,
289 const SmallVectorImpl<MachineOperand> &Cond) const {
290 // Shouldn't be a fall through.
291 assert(TBB && "InsertBranch must not be told to insert a fallthrough");
292 assert((Cond.size() == 2 || Cond.size() == 0) &&
293 "PPC branch conditions have two components!");
297 if (Cond.empty()) // Unconditional branch
298 BuildMI(&MBB, get(PPC::B)).addMBB(TBB);
299 else // Conditional branch
300 BuildMI(&MBB, get(PPC::BCC))
301 .addImm(Cond[0].getImm()).addReg(Cond[1].getReg()).addMBB(TBB);
305 // Two-way Conditional Branch.
306 BuildMI(&MBB, get(PPC::BCC))
307 .addImm(Cond[0].getImm()).addReg(Cond[1].getReg()).addMBB(TBB);
308 BuildMI(&MBB, get(PPC::B)).addMBB(FBB);
312 bool PPCInstrInfo::copyRegToReg(MachineBasicBlock &MBB,
313 MachineBasicBlock::iterator MI,
314 unsigned DestReg, unsigned SrcReg,
315 const TargetRegisterClass *DestRC,
316 const TargetRegisterClass *SrcRC) const {
317 if (DestRC != SrcRC) {
318 // Not yet supported!
322 if (DestRC == PPC::GPRCRegisterClass) {
323 BuildMI(MBB, MI, get(PPC::OR), DestReg).addReg(SrcReg).addReg(SrcReg);
324 } else if (DestRC == PPC::G8RCRegisterClass) {
325 BuildMI(MBB, MI, get(PPC::OR8), DestReg).addReg(SrcReg).addReg(SrcReg);
326 } else if (DestRC == PPC::F4RCRegisterClass) {
327 BuildMI(MBB, MI, get(PPC::FMRS), DestReg).addReg(SrcReg);
328 } else if (DestRC == PPC::F8RCRegisterClass) {
329 BuildMI(MBB, MI, get(PPC::FMRD), DestReg).addReg(SrcReg);
330 } else if (DestRC == PPC::CRRCRegisterClass) {
331 BuildMI(MBB, MI, get(PPC::MCRF), DestReg).addReg(SrcReg);
332 } else if (DestRC == PPC::VRRCRegisterClass) {
333 BuildMI(MBB, MI, get(PPC::VOR), DestReg).addReg(SrcReg).addReg(SrcReg);
334 } else if (DestRC == PPC::CRBITRCRegisterClass) {
335 BuildMI(MBB, MI, get(PPC::CROR), DestReg).addReg(SrcReg).addReg(SrcReg);
337 // Attempt to copy register that is not GPR or FPR
345 PPCInstrInfo::StoreRegToStackSlot(MachineFunction &MF,
346 unsigned SrcReg, bool isKill,
348 const TargetRegisterClass *RC,
349 SmallVectorImpl<MachineInstr*> &NewMIs) const{
350 if (RC == PPC::GPRCRegisterClass) {
351 if (SrcReg != PPC::LR) {
352 NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::STW))
353 .addReg(SrcReg, false, false, isKill),
356 // FIXME: this spills LR immediately to memory in one step. To do this,
357 // we use R11, which we know cannot be used in the prolog/epilog. This is
359 NewMIs.push_back(BuildMI(MF, get(PPC::MFLR), PPC::R11));
360 NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::STW))
361 .addReg(PPC::R11, false, false, isKill),
364 } else if (RC == PPC::G8RCRegisterClass) {
365 if (SrcReg != PPC::LR8) {
366 NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::STD))
367 .addReg(SrcReg, false, false, isKill), FrameIdx));
369 // FIXME: this spills LR immediately to memory in one step. To do this,
370 // we use R11, which we know cannot be used in the prolog/epilog. This is
372 NewMIs.push_back(BuildMI(MF, get(PPC::MFLR8), PPC::X11));
373 NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::STD))
374 .addReg(PPC::X11, false, false, isKill), FrameIdx));
376 } else if (RC == PPC::F8RCRegisterClass) {
377 NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::STFD))
378 .addReg(SrcReg, false, false, isKill), FrameIdx));
379 } else if (RC == PPC::F4RCRegisterClass) {
380 NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::STFS))
381 .addReg(SrcReg, false, false, isKill), FrameIdx));
382 } else if (RC == PPC::CRRCRegisterClass) {
383 if ((EnablePPC32RS && !TM.getSubtargetImpl()->isPPC64()) ||
384 (EnablePPC64RS && TM.getSubtargetImpl()->isPPC64())) {
385 // FIXME (64-bit): Enable
386 NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::SPILL_CR))
387 .addReg(SrcReg, false, false, isKill),
391 // FIXME: We use R0 here, because it isn't available for RA. We need to
392 // store the CR in the low 4-bits of the saved value. First, issue a MFCR
393 // to save all of the CRBits.
394 NewMIs.push_back(BuildMI(MF, get(PPC::MFCR), PPC::R0));
396 // If the saved register wasn't CR0, shift the bits left so that they are
398 if (SrcReg != PPC::CR0) {
399 unsigned ShiftBits = PPCRegisterInfo::getRegisterNumbering(SrcReg)*4;
400 // rlwinm r0, r0, ShiftBits, 0, 31.
401 NewMIs.push_back(BuildMI(MF, get(PPC::RLWINM), PPC::R0)
402 .addReg(PPC::R0).addImm(ShiftBits).addImm(0).addImm(31));
405 NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::STW))
406 .addReg(PPC::R0, false, false, isKill),
409 } else if (RC == PPC::CRBITRCRegisterClass) {
410 // FIXME: We use CRi here because there is no mtcrf on a bit. Since the
411 // backend currently only uses CR1EQ as an individual bit, this should
412 // not cause any bug. If we need other uses of CR bits, the following
413 // code may be invalid.
415 if (SrcReg >= PPC::CR0LT || SrcReg <= PPC::CR0UN)
417 else if (SrcReg >= PPC::CR1LT || SrcReg <= PPC::CR1UN)
419 else if (SrcReg >= PPC::CR2LT || SrcReg <= PPC::CR2UN)
421 else if (SrcReg >= PPC::CR3LT || SrcReg <= PPC::CR3UN)
423 else if (SrcReg >= PPC::CR4LT || SrcReg <= PPC::CR4UN)
425 else if (SrcReg >= PPC::CR5LT || SrcReg <= PPC::CR5UN)
427 else if (SrcReg >= PPC::CR6LT || SrcReg <= PPC::CR6UN)
429 else if (SrcReg >= PPC::CR7LT || SrcReg <= PPC::CR7UN)
432 return StoreRegToStackSlot(MF, Reg, isKill, FrameIdx,
433 PPC::CRRCRegisterClass, NewMIs);
435 } else if (RC == PPC::VRRCRegisterClass) {
436 // We don't have indexed addressing for vector loads. Emit:
440 // FIXME: We use R0 here, because it isn't available for RA.
441 NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::ADDI), PPC::R0),
443 NewMIs.push_back(BuildMI(MF, get(PPC::STVX))
444 .addReg(SrcReg, false, false, isKill).addReg(PPC::R0).addReg(PPC::R0));
446 assert(0 && "Unknown regclass!");
454 PPCInstrInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
455 MachineBasicBlock::iterator MI,
456 unsigned SrcReg, bool isKill, int FrameIdx,
457 const TargetRegisterClass *RC) const {
458 MachineFunction &MF = *MBB.getParent();
459 SmallVector<MachineInstr*, 4> NewMIs;
461 if (StoreRegToStackSlot(MF, SrcReg, isKill, FrameIdx, RC, NewMIs)) {
462 PPCFunctionInfo *FuncInfo = MF.getInfo<PPCFunctionInfo>();
463 FuncInfo->setSpillsCR();
466 for (unsigned i = 0, e = NewMIs.size(); i != e; ++i)
467 MBB.insert(MI, NewMIs[i]);
470 void PPCInstrInfo::storeRegToAddr(MachineFunction &MF, unsigned SrcReg,
472 SmallVectorImpl<MachineOperand> &Addr,
473 const TargetRegisterClass *RC,
474 SmallVectorImpl<MachineInstr*> &NewMIs) const{
475 if (Addr[0].isFI()) {
476 if (StoreRegToStackSlot(MF, SrcReg, isKill,
477 Addr[0].getIndex(), RC, NewMIs)) {
478 PPCFunctionInfo *FuncInfo = MF.getInfo<PPCFunctionInfo>();
479 FuncInfo->setSpillsCR();
486 if (RC == PPC::GPRCRegisterClass) {
488 } else if (RC == PPC::G8RCRegisterClass) {
490 } else if (RC == PPC::F8RCRegisterClass) {
492 } else if (RC == PPC::F4RCRegisterClass) {
494 } else if (RC == PPC::VRRCRegisterClass) {
497 assert(0 && "Unknown regclass!");
500 MachineInstrBuilder MIB = BuildMI(MF, get(Opc))
501 .addReg(SrcReg, false, false, isKill);
502 for (unsigned i = 0, e = Addr.size(); i != e; ++i) {
503 MachineOperand &MO = Addr[i];
505 MIB.addReg(MO.getReg());
507 MIB.addImm(MO.getImm());
509 MIB.addFrameIndex(MO.getIndex());
511 NewMIs.push_back(MIB);
516 PPCInstrInfo::LoadRegFromStackSlot(MachineFunction &MF,
517 unsigned DestReg, int FrameIdx,
518 const TargetRegisterClass *RC,
519 SmallVectorImpl<MachineInstr*> &NewMIs)const{
520 if (RC == PPC::GPRCRegisterClass) {
521 if (DestReg != PPC::LR) {
522 NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::LWZ), DestReg),
525 NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::LWZ), PPC::R11),
527 NewMIs.push_back(BuildMI(MF, get(PPC::MTLR)).addReg(PPC::R11));
529 } else if (RC == PPC::G8RCRegisterClass) {
530 if (DestReg != PPC::LR8) {
531 NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::LD), DestReg),
534 NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::LD), PPC::R11),
536 NewMIs.push_back(BuildMI(MF, get(PPC::MTLR8)).addReg(PPC::R11));
538 } else if (RC == PPC::F8RCRegisterClass) {
539 NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::LFD), DestReg),
541 } else if (RC == PPC::F4RCRegisterClass) {
542 NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::LFS), DestReg),
544 } else if (RC == PPC::CRRCRegisterClass) {
545 // FIXME: We use R0 here, because it isn't available for RA.
546 NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::LWZ), PPC::R0),
549 // If the reloaded register isn't CR0, shift the bits right so that they are
550 // in the right CR's slot.
551 if (DestReg != PPC::CR0) {
552 unsigned ShiftBits = PPCRegisterInfo::getRegisterNumbering(DestReg)*4;
553 // rlwinm r11, r11, 32-ShiftBits, 0, 31.
554 NewMIs.push_back(BuildMI(MF, get(PPC::RLWINM), PPC::R0)
555 .addReg(PPC::R0).addImm(32-ShiftBits).addImm(0).addImm(31));
558 NewMIs.push_back(BuildMI(MF, get(PPC::MTCRF), DestReg).addReg(PPC::R0));
559 } else if (RC == PPC::CRBITRCRegisterClass) {
562 if (DestReg >= PPC::CR0LT || DestReg <= PPC::CR0UN)
564 else if (DestReg >= PPC::CR1LT || DestReg <= PPC::CR1UN)
566 else if (DestReg >= PPC::CR2LT || DestReg <= PPC::CR2UN)
568 else if (DestReg >= PPC::CR3LT || DestReg <= PPC::CR3UN)
570 else if (DestReg >= PPC::CR4LT || DestReg <= PPC::CR4UN)
572 else if (DestReg >= PPC::CR5LT || DestReg <= PPC::CR5UN)
574 else if (DestReg >= PPC::CR6LT || DestReg <= PPC::CR6UN)
576 else if (DestReg >= PPC::CR7LT || DestReg <= PPC::CR7UN)
579 return LoadRegFromStackSlot(MF, Reg, FrameIdx,
580 PPC::CRRCRegisterClass, NewMIs);
582 } else if (RC == PPC::VRRCRegisterClass) {
583 // We don't have indexed addressing for vector loads. Emit:
587 // FIXME: We use R0 here, because it isn't available for RA.
588 NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::ADDI), PPC::R0),
590 NewMIs.push_back(BuildMI(MF, get(PPC::LVX),DestReg).addReg(PPC::R0)
593 assert(0 && "Unknown regclass!");
599 PPCInstrInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
600 MachineBasicBlock::iterator MI,
601 unsigned DestReg, int FrameIdx,
602 const TargetRegisterClass *RC) const {
603 MachineFunction &MF = *MBB.getParent();
604 SmallVector<MachineInstr*, 4> NewMIs;
605 LoadRegFromStackSlot(MF, DestReg, FrameIdx, RC, NewMIs);
606 for (unsigned i = 0, e = NewMIs.size(); i != e; ++i)
607 MBB.insert(MI, NewMIs[i]);
610 void PPCInstrInfo::loadRegFromAddr(MachineFunction &MF, unsigned DestReg,
611 SmallVectorImpl<MachineOperand> &Addr,
612 const TargetRegisterClass *RC,
613 SmallVectorImpl<MachineInstr*> &NewMIs)const{
614 if (Addr[0].isFI()) {
615 LoadRegFromStackSlot(MF, DestReg, Addr[0].getIndex(), RC, NewMIs);
620 if (RC == PPC::GPRCRegisterClass) {
621 assert(DestReg != PPC::LR && "Can't handle this yet!");
623 } else if (RC == PPC::G8RCRegisterClass) {
624 assert(DestReg != PPC::LR8 && "Can't handle this yet!");
626 } else if (RC == PPC::F8RCRegisterClass) {
628 } else if (RC == PPC::F4RCRegisterClass) {
630 } else if (RC == PPC::VRRCRegisterClass) {
633 assert(0 && "Unknown regclass!");
636 MachineInstrBuilder MIB = BuildMI(MF, get(Opc), DestReg);
637 for (unsigned i = 0, e = Addr.size(); i != e; ++i) {
638 MachineOperand &MO = Addr[i];
640 MIB.addReg(MO.getReg());
642 MIB.addImm(MO.getImm());
644 MIB.addFrameIndex(MO.getIndex());
646 NewMIs.push_back(MIB);
650 /// foldMemoryOperand - PowerPC (like most RISC's) can only fold spills into
651 /// copy instructions, turning them into load/store instructions.
652 MachineInstr *PPCInstrInfo::foldMemoryOperandImpl(MachineFunction &MF,
654 const SmallVectorImpl<unsigned> &Ops,
655 int FrameIndex) const {
656 if (Ops.size() != 1) return NULL;
658 // Make sure this is a reg-reg copy. Note that we can't handle MCRF, because
659 // it takes more than one instruction to store it.
660 unsigned Opc = MI->getOpcode();
661 unsigned OpNum = Ops[0];
663 MachineInstr *NewMI = NULL;
664 if ((Opc == PPC::OR &&
665 MI->getOperand(1).getReg() == MI->getOperand(2).getReg())) {
666 if (OpNum == 0) { // move -> store
667 unsigned InReg = MI->getOperand(1).getReg();
668 bool isKill = MI->getOperand(1).isKill();
669 NewMI = addFrameReference(BuildMI(MF, get(PPC::STW))
670 .addReg(InReg, false, false, isKill),
672 } else { // move -> load
673 unsigned OutReg = MI->getOperand(0).getReg();
674 bool isDead = MI->getOperand(0).isDead();
675 NewMI = addFrameReference(BuildMI(MF, get(PPC::LWZ))
676 .addReg(OutReg, true, false, false, isDead),
679 } else if ((Opc == PPC::OR8 &&
680 MI->getOperand(1).getReg() == MI->getOperand(2).getReg())) {
681 if (OpNum == 0) { // move -> store
682 unsigned InReg = MI->getOperand(1).getReg();
683 bool isKill = MI->getOperand(1).isKill();
684 NewMI = addFrameReference(BuildMI(MF, get(PPC::STD))
685 .addReg(InReg, false, false, isKill),
687 } else { // move -> load
688 unsigned OutReg = MI->getOperand(0).getReg();
689 bool isDead = MI->getOperand(0).isDead();
690 NewMI = addFrameReference(BuildMI(MF, get(PPC::LD))
691 .addReg(OutReg, true, false, false, isDead),
694 } else if (Opc == PPC::FMRD) {
695 if (OpNum == 0) { // move -> store
696 unsigned InReg = MI->getOperand(1).getReg();
697 bool isKill = MI->getOperand(1).isKill();
698 NewMI = addFrameReference(BuildMI(MF, get(PPC::STFD))
699 .addReg(InReg, false, false, isKill),
701 } else { // move -> load
702 unsigned OutReg = MI->getOperand(0).getReg();
703 bool isDead = MI->getOperand(0).isDead();
704 NewMI = addFrameReference(BuildMI(MF, get(PPC::LFD))
705 .addReg(OutReg, true, false, false, isDead),
708 } else if (Opc == PPC::FMRS) {
709 if (OpNum == 0) { // move -> store
710 unsigned InReg = MI->getOperand(1).getReg();
711 bool isKill = MI->getOperand(1).isKill();
712 NewMI = addFrameReference(BuildMI(MF, get(PPC::STFS))
713 .addReg(InReg, false, false, isKill),
715 } else { // move -> load
716 unsigned OutReg = MI->getOperand(0).getReg();
717 bool isDead = MI->getOperand(0).isDead();
718 NewMI = addFrameReference(BuildMI(MF, get(PPC::LFS))
719 .addReg(OutReg, true, false, false, isDead),
727 bool PPCInstrInfo::canFoldMemoryOperand(const MachineInstr *MI,
728 const SmallVectorImpl<unsigned> &Ops) const {
729 if (Ops.size() != 1) return false;
731 // Make sure this is a reg-reg copy. Note that we can't handle MCRF, because
732 // it takes more than one instruction to store it.
733 unsigned Opc = MI->getOpcode();
735 if ((Opc == PPC::OR &&
736 MI->getOperand(1).getReg() == MI->getOperand(2).getReg()))
738 else if ((Opc == PPC::OR8 &&
739 MI->getOperand(1).getReg() == MI->getOperand(2).getReg()))
741 else if (Opc == PPC::FMRD || Opc == PPC::FMRS)
748 bool PPCInstrInfo::BlockHasNoFallThrough(const MachineBasicBlock &MBB) const {
749 if (MBB.empty()) return false;
751 switch (MBB.back().getOpcode()) {
752 case PPC::BLR: // Return.
753 case PPC::B: // Uncond branch.
754 case PPC::BCTR: // Indirect branch.
756 default: return false;
761 ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const {
762 assert(Cond.size() == 2 && "Invalid PPC branch opcode!");
763 // Leave the CR# the same, but invert the condition.
764 Cond[0].setImm(PPC::InvertPredicate((PPC::Predicate)Cond[0].getImm()));
768 /// GetInstSize - Return the number of bytes of code the specified
769 /// instruction may be. This returns the maximum number of bytes.
771 unsigned PPCInstrInfo::GetInstSizeInBytes(const MachineInstr *MI) const {
772 switch (MI->getOpcode()) {
773 case PPC::INLINEASM: { // Inline Asm: Variable size.
774 const MachineFunction *MF = MI->getParent()->getParent();
775 const char *AsmStr = MI->getOperand(0).getSymbolName();
776 return MF->getTarget().getTargetAsmInfo()->getInlineAsmLength(AsmStr);
783 return 4; // PowerPC instructions are all 4 bytes