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 "PPCPredicates.h"
17 #include "PPCGenInstrInfo.inc"
18 #include "PPCTargetMachine.h"
19 #include "llvm/ADT/STLExtras.h"
20 #include "llvm/CodeGen/MachineInstrBuilder.h"
23 PPCInstrInfo::PPCInstrInfo(PPCTargetMachine &tm)
24 : TargetInstrInfoImpl(PPCInsts, array_lengthof(PPCInsts)), TM(tm),
25 RI(*TM.getSubtargetImpl(), *this) {}
27 /// getPointerRegClass - Return the register class to use to hold pointers.
28 /// This is used for addressing modes.
29 const TargetRegisterClass *PPCInstrInfo::getPointerRegClass() const {
30 if (TM.getSubtargetImpl()->isPPC64())
31 return &PPC::G8RCRegClass;
33 return &PPC::GPRCRegClass;
37 bool PPCInstrInfo::isMoveInstr(const MachineInstr& MI,
39 unsigned& destReg) const {
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).isRegister() &&
45 MI.getOperand(1).isRegister() &&
46 MI.getOperand(2).isRegister() &&
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).isRegister() &&
56 MI.getOperand(2).isImmediate() &&
57 "invalid PPC ADDI instruction!");
58 if (MI.getOperand(1).isRegister() && 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).isRegister() &&
66 MI.getOperand(1).isRegister() &&
67 MI.getOperand(2).isImmediate() &&
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).isRegister() &&
78 MI.getOperand(1).isRegister() &&
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).isRegister() &&
86 MI.getOperand(1).isRegister() &&
87 "invalid PPC MCRF instruction");
88 sourceReg = MI.getOperand(1).getReg();
89 destReg = MI.getOperand(0).getReg();
95 unsigned PPCInstrInfo::isLoadFromStackSlot(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(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.
133 MachineInstr *PPCInstrInfo::commuteInstruction(MachineInstr *MI) const {
134 // Normal instructions can be commuted the obvious way.
135 if (MI->getOpcode() != PPC::RLWIMI)
136 return TargetInstrInfoImpl::commuteInstruction(MI);
138 // Cannot commute if it has a non-zero rotate count.
139 if (MI->getOperand(3).getImm() != 0)
142 // If we have a zero rotate count, we have:
144 // Op0 = (Op1 & ~M) | (Op2 & M)
146 // M = mask((ME+1)&31, (MB-1)&31)
147 // Op0 = (Op2 & ~M) | (Op1 & M)
150 unsigned Reg0 = MI->getOperand(0).getReg();
151 unsigned Reg1 = MI->getOperand(1).getReg();
152 unsigned Reg2 = MI->getOperand(2).getReg();
153 bool Reg1IsKill = MI->getOperand(1).isKill();
154 bool Reg2IsKill = MI->getOperand(2).isKill();
155 // If machine instrs are no longer in two-address forms, update
156 // destination register as well.
158 // Must be two address instruction!
159 assert(MI->getDesc().getOperandConstraint(0, TOI::TIED_TO) &&
160 "Expecting a two-address instruction!");
161 MI->getOperand(0).setReg(Reg2);
164 MI->getOperand(2).setReg(Reg1);
165 MI->getOperand(1).setReg(Reg2);
166 MI->getOperand(2).setIsKill(Reg1IsKill);
167 MI->getOperand(1).setIsKill(Reg2IsKill);
169 // Swap the mask around.
170 unsigned MB = MI->getOperand(4).getImm();
171 unsigned ME = MI->getOperand(5).getImm();
172 MI->getOperand(4).setImm((ME+1) & 31);
173 MI->getOperand(5).setImm((MB-1) & 31);
177 void PPCInstrInfo::insertNoop(MachineBasicBlock &MBB,
178 MachineBasicBlock::iterator MI) const {
179 BuildMI(MBB, MI, get(PPC::NOP));
184 bool PPCInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,MachineBasicBlock *&TBB,
185 MachineBasicBlock *&FBB,
186 std::vector<MachineOperand> &Cond) const {
187 // If the block has no terminators, it just falls into the block after it.
188 MachineBasicBlock::iterator I = MBB.end();
189 if (I == MBB.begin() || !isUnpredicatedTerminator(--I))
192 // Get the last instruction in the block.
193 MachineInstr *LastInst = I;
195 // If there is only one terminator instruction, process it.
196 if (I == MBB.begin() || !isUnpredicatedTerminator(--I)) {
197 if (LastInst->getOpcode() == PPC::B) {
198 TBB = LastInst->getOperand(0).getMBB();
200 } else if (LastInst->getOpcode() == PPC::BCC) {
201 // Block ends with fall-through condbranch.
202 TBB = LastInst->getOperand(2).getMBB();
203 Cond.push_back(LastInst->getOperand(0));
204 Cond.push_back(LastInst->getOperand(1));
207 // Otherwise, don't know what this is.
211 // Get the instruction before it if it's a terminator.
212 MachineInstr *SecondLastInst = I;
214 // If there are three terminators, we don't know what sort of block this is.
215 if (SecondLastInst && I != MBB.begin() &&
216 isUnpredicatedTerminator(--I))
219 // If the block ends with PPC::B and PPC:BCC, handle it.
220 if (SecondLastInst->getOpcode() == PPC::BCC &&
221 LastInst->getOpcode() == PPC::B) {
222 TBB = SecondLastInst->getOperand(2).getMBB();
223 Cond.push_back(SecondLastInst->getOperand(0));
224 Cond.push_back(SecondLastInst->getOperand(1));
225 FBB = LastInst->getOperand(0).getMBB();
229 // If the block ends with two PPC:Bs, handle it. The second one is not
230 // executed, so remove it.
231 if (SecondLastInst->getOpcode() == PPC::B &&
232 LastInst->getOpcode() == PPC::B) {
233 TBB = SecondLastInst->getOperand(0).getMBB();
235 I->eraseFromParent();
239 // Otherwise, can't handle this.
243 unsigned PPCInstrInfo::RemoveBranch(MachineBasicBlock &MBB) const {
244 MachineBasicBlock::iterator I = MBB.end();
245 if (I == MBB.begin()) return 0;
247 if (I->getOpcode() != PPC::B && I->getOpcode() != PPC::BCC)
250 // Remove the branch.
251 I->eraseFromParent();
255 if (I == MBB.begin()) return 1;
257 if (I->getOpcode() != PPC::BCC)
260 // Remove the branch.
261 I->eraseFromParent();
266 PPCInstrInfo::InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
267 MachineBasicBlock *FBB,
268 const std::vector<MachineOperand> &Cond) const {
269 // Shouldn't be a fall through.
270 assert(TBB && "InsertBranch must not be told to insert a fallthrough");
271 assert((Cond.size() == 2 || Cond.size() == 0) &&
272 "PPC branch conditions have two components!");
276 if (Cond.empty()) // Unconditional branch
277 BuildMI(&MBB, get(PPC::B)).addMBB(TBB);
278 else // Conditional branch
279 BuildMI(&MBB, get(PPC::BCC))
280 .addImm(Cond[0].getImm()).addReg(Cond[1].getReg()).addMBB(TBB);
284 // Two-way Conditional Branch.
285 BuildMI(&MBB, get(PPC::BCC))
286 .addImm(Cond[0].getImm()).addReg(Cond[1].getReg()).addMBB(TBB);
287 BuildMI(&MBB, get(PPC::B)).addMBB(FBB);
291 void PPCInstrInfo::copyRegToReg(MachineBasicBlock &MBB,
292 MachineBasicBlock::iterator MI,
293 unsigned DestReg, unsigned SrcReg,
294 const TargetRegisterClass *DestRC,
295 const TargetRegisterClass *SrcRC) const {
296 if (DestRC != SrcRC) {
297 cerr << "Not yet supported!";
301 if (DestRC == PPC::GPRCRegisterClass) {
302 BuildMI(MBB, MI, get(PPC::OR), DestReg).addReg(SrcReg).addReg(SrcReg);
303 } else if (DestRC == PPC::G8RCRegisterClass) {
304 BuildMI(MBB, MI, get(PPC::OR8), DestReg).addReg(SrcReg).addReg(SrcReg);
305 } else if (DestRC == PPC::F4RCRegisterClass) {
306 BuildMI(MBB, MI, get(PPC::FMRS), DestReg).addReg(SrcReg);
307 } else if (DestRC == PPC::F8RCRegisterClass) {
308 BuildMI(MBB, MI, get(PPC::FMRD), DestReg).addReg(SrcReg);
309 } else if (DestRC == PPC::CRRCRegisterClass) {
310 BuildMI(MBB, MI, get(PPC::MCRF), DestReg).addReg(SrcReg);
311 } else if (DestRC == PPC::VRRCRegisterClass) {
312 BuildMI(MBB, MI, get(PPC::VOR), DestReg).addReg(SrcReg).addReg(SrcReg);
314 cerr << "Attempt to copy register that is not GPR or FPR";
319 static void StoreRegToStackSlot(const TargetInstrInfo &TII,
320 unsigned SrcReg, bool isKill, int FrameIdx,
321 const TargetRegisterClass *RC,
322 SmallVectorImpl<MachineInstr*> &NewMIs) {
323 if (RC == PPC::GPRCRegisterClass) {
324 if (SrcReg != PPC::LR) {
325 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::STW))
326 .addReg(SrcReg, false, false, isKill), FrameIdx));
328 // FIXME: this spills LR immediately to memory in one step. To do this,
329 // we use R11, which we know cannot be used in the prolog/epilog. This is
331 NewMIs.push_back(BuildMI(TII.get(PPC::MFLR), PPC::R11));
332 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::STW))
333 .addReg(PPC::R11, false, false, isKill), FrameIdx));
335 } else if (RC == PPC::G8RCRegisterClass) {
336 if (SrcReg != PPC::LR8) {
337 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::STD))
338 .addReg(SrcReg, false, false, isKill), FrameIdx));
340 // FIXME: this spills LR immediately to memory in one step. To do this,
341 // we use R11, which we know cannot be used in the prolog/epilog. This is
343 NewMIs.push_back(BuildMI(TII.get(PPC::MFLR8), PPC::X11));
344 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::STD))
345 .addReg(PPC::X11, false, false, isKill), FrameIdx));
347 } else if (RC == PPC::F8RCRegisterClass) {
348 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::STFD))
349 .addReg(SrcReg, false, false, isKill), FrameIdx));
350 } else if (RC == PPC::F4RCRegisterClass) {
351 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::STFS))
352 .addReg(SrcReg, false, false, isKill), FrameIdx));
353 } else if (RC == PPC::CRRCRegisterClass) {
354 // FIXME: We use R0 here, because it isn't available for RA.
355 // We need to store the CR in the low 4-bits of the saved value. First,
356 // issue a MFCR to save all of the CRBits.
357 NewMIs.push_back(BuildMI(TII.get(PPC::MFCR), PPC::R0));
359 // If the saved register wasn't CR0, shift the bits left so that they are in
361 if (SrcReg != PPC::CR0) {
362 unsigned ShiftBits = PPCRegisterInfo::getRegisterNumbering(SrcReg)*4;
363 // rlwinm r0, r0, ShiftBits, 0, 31.
364 NewMIs.push_back(BuildMI(TII.get(PPC::RLWINM), PPC::R0)
365 .addReg(PPC::R0).addImm(ShiftBits).addImm(0).addImm(31));
368 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::STW))
369 .addReg(PPC::R0, false, false, isKill), FrameIdx));
370 } else if (RC == PPC::VRRCRegisterClass) {
371 // We don't have indexed addressing for vector loads. Emit:
375 // FIXME: We use R0 here, because it isn't available for RA.
376 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::ADDI), PPC::R0),
378 NewMIs.push_back(BuildMI(TII.get(PPC::STVX))
379 .addReg(SrcReg, false, false, isKill).addReg(PPC::R0).addReg(PPC::R0));
381 assert(0 && "Unknown regclass!");
387 PPCInstrInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
388 MachineBasicBlock::iterator MI,
389 unsigned SrcReg, bool isKill, int FrameIdx,
390 const TargetRegisterClass *RC) const {
391 SmallVector<MachineInstr*, 4> NewMIs;
392 StoreRegToStackSlot(*this, SrcReg, isKill, FrameIdx, RC, NewMIs);
393 for (unsigned i = 0, e = NewMIs.size(); i != e; ++i)
394 MBB.insert(MI, NewMIs[i]);
397 void PPCInstrInfo::storeRegToAddr(MachineFunction &MF, unsigned SrcReg,
399 SmallVectorImpl<MachineOperand> &Addr,
400 const TargetRegisterClass *RC,
401 SmallVectorImpl<MachineInstr*> &NewMIs) const {
402 if (Addr[0].isFrameIndex()) {
403 StoreRegToStackSlot(*this, SrcReg, isKill, Addr[0].getIndex(), RC, NewMIs);
408 if (RC == PPC::GPRCRegisterClass) {
410 } else if (RC == PPC::G8RCRegisterClass) {
412 } else if (RC == PPC::F8RCRegisterClass) {
414 } else if (RC == PPC::F4RCRegisterClass) {
416 } else if (RC == PPC::VRRCRegisterClass) {
419 assert(0 && "Unknown regclass!");
422 MachineInstrBuilder MIB = BuildMI(get(Opc))
423 .addReg(SrcReg, false, false, isKill);
424 for (unsigned i = 0, e = Addr.size(); i != e; ++i) {
425 MachineOperand &MO = Addr[i];
427 MIB.addReg(MO.getReg());
428 else if (MO.isImmediate())
429 MIB.addImm(MO.getImm());
431 MIB.addFrameIndex(MO.getIndex());
433 NewMIs.push_back(MIB);
437 static void LoadRegFromStackSlot(const TargetInstrInfo &TII,
438 unsigned DestReg, int FrameIdx,
439 const TargetRegisterClass *RC,
440 SmallVectorImpl<MachineInstr*> &NewMIs) {
441 if (RC == PPC::GPRCRegisterClass) {
442 if (DestReg != PPC::LR) {
443 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::LWZ), DestReg),
446 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::LWZ), PPC::R11),
448 NewMIs.push_back(BuildMI(TII.get(PPC::MTLR)).addReg(PPC::R11));
450 } else if (RC == PPC::G8RCRegisterClass) {
451 if (DestReg != PPC::LR8) {
452 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::LD), DestReg),
455 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::LD), PPC::R11),
457 NewMIs.push_back(BuildMI(TII.get(PPC::MTLR8)).addReg(PPC::R11));
459 } else if (RC == PPC::F8RCRegisterClass) {
460 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::LFD), DestReg),
462 } else if (RC == PPC::F4RCRegisterClass) {
463 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::LFS), DestReg),
465 } else if (RC == PPC::CRRCRegisterClass) {
466 // FIXME: We use R0 here, because it isn't available for RA.
467 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::LWZ), PPC::R0),
470 // If the reloaded register isn't CR0, shift the bits right so that they are
471 // in the right CR's slot.
472 if (DestReg != PPC::CR0) {
473 unsigned ShiftBits = PPCRegisterInfo::getRegisterNumbering(DestReg)*4;
474 // rlwinm r11, r11, 32-ShiftBits, 0, 31.
475 NewMIs.push_back(BuildMI(TII.get(PPC::RLWINM), PPC::R0)
476 .addReg(PPC::R0).addImm(32-ShiftBits).addImm(0).addImm(31));
479 NewMIs.push_back(BuildMI(TII.get(PPC::MTCRF), DestReg).addReg(PPC::R0));
480 } else if (RC == PPC::VRRCRegisterClass) {
481 // We don't have indexed addressing for vector loads. Emit:
485 // FIXME: We use R0 here, because it isn't available for RA.
486 NewMIs.push_back(addFrameReference(BuildMI(TII.get(PPC::ADDI), PPC::R0),
488 NewMIs.push_back(BuildMI(TII.get(PPC::LVX),DestReg).addReg(PPC::R0)
491 assert(0 && "Unknown regclass!");
497 PPCInstrInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
498 MachineBasicBlock::iterator MI,
499 unsigned DestReg, int FrameIdx,
500 const TargetRegisterClass *RC) const {
501 SmallVector<MachineInstr*, 4> NewMIs;
502 LoadRegFromStackSlot(*this, DestReg, FrameIdx, RC, NewMIs);
503 for (unsigned i = 0, e = NewMIs.size(); i != e; ++i)
504 MBB.insert(MI, NewMIs[i]);
507 void PPCInstrInfo::loadRegFromAddr(MachineFunction &MF, unsigned DestReg,
508 SmallVectorImpl<MachineOperand> &Addr,
509 const TargetRegisterClass *RC,
510 SmallVectorImpl<MachineInstr*> &NewMIs) const{
511 if (Addr[0].isFrameIndex()) {
512 LoadRegFromStackSlot(*this, DestReg, Addr[0].getIndex(), RC, NewMIs);
517 if (RC == PPC::GPRCRegisterClass) {
518 assert(DestReg != PPC::LR && "Can't handle this yet!");
520 } else if (RC == PPC::G8RCRegisterClass) {
521 assert(DestReg != PPC::LR8 && "Can't handle this yet!");
523 } else if (RC == PPC::F8RCRegisterClass) {
525 } else if (RC == PPC::F4RCRegisterClass) {
527 } else if (RC == PPC::VRRCRegisterClass) {
530 assert(0 && "Unknown regclass!");
533 MachineInstrBuilder MIB = BuildMI(get(Opc), DestReg);
534 for (unsigned i = 0, e = Addr.size(); i != e; ++i) {
535 MachineOperand &MO = Addr[i];
537 MIB.addReg(MO.getReg());
538 else if (MO.isImmediate())
539 MIB.addImm(MO.getImm());
541 MIB.addFrameIndex(MO.getIndex());
543 NewMIs.push_back(MIB);
547 /// foldMemoryOperand - PowerPC (like most RISC's) can only fold spills into
548 /// copy instructions, turning them into load/store instructions.
549 MachineInstr *PPCInstrInfo::foldMemoryOperand(MachineFunction &MF,
551 SmallVectorImpl<unsigned> &Ops,
552 int FrameIndex) const {
553 if (Ops.size() != 1) return NULL;
555 // Make sure this is a reg-reg copy. Note that we can't handle MCRF, because
556 // it takes more than one instruction to store it.
557 unsigned Opc = MI->getOpcode();
558 unsigned OpNum = Ops[0];
560 MachineInstr *NewMI = NULL;
561 if ((Opc == PPC::OR &&
562 MI->getOperand(1).getReg() == MI->getOperand(2).getReg())) {
563 if (OpNum == 0) { // move -> store
564 unsigned InReg = MI->getOperand(1).getReg();
565 NewMI = addFrameReference(BuildMI(get(PPC::STW)).addReg(InReg),
567 } else { // move -> load
568 unsigned OutReg = MI->getOperand(0).getReg();
569 NewMI = addFrameReference(BuildMI(get(PPC::LWZ), OutReg),
572 } else if ((Opc == PPC::OR8 &&
573 MI->getOperand(1).getReg() == MI->getOperand(2).getReg())) {
574 if (OpNum == 0) { // move -> store
575 unsigned InReg = MI->getOperand(1).getReg();
576 NewMI = addFrameReference(BuildMI(get(PPC::STD)).addReg(InReg),
578 } else { // move -> load
579 unsigned OutReg = MI->getOperand(0).getReg();
580 NewMI = addFrameReference(BuildMI(get(PPC::LD), OutReg), FrameIndex);
582 } else if (Opc == PPC::FMRD) {
583 if (OpNum == 0) { // move -> store
584 unsigned InReg = MI->getOperand(1).getReg();
585 NewMI = addFrameReference(BuildMI(get(PPC::STFD)).addReg(InReg),
587 } else { // move -> load
588 unsigned OutReg = MI->getOperand(0).getReg();
589 NewMI = addFrameReference(BuildMI(get(PPC::LFD), OutReg), FrameIndex);
591 } else if (Opc == PPC::FMRS) {
592 if (OpNum == 0) { // move -> store
593 unsigned InReg = MI->getOperand(1).getReg();
594 NewMI = addFrameReference(BuildMI(get(PPC::STFS)).addReg(InReg),
596 } else { // move -> load
597 unsigned OutReg = MI->getOperand(0).getReg();
598 NewMI = addFrameReference(BuildMI(get(PPC::LFS), OutReg), FrameIndex);
603 NewMI->copyKillDeadInfo(MI);
607 bool PPCInstrInfo::canFoldMemoryOperand(MachineInstr *MI,
608 SmallVectorImpl<unsigned> &Ops) const {
609 if (Ops.size() != 1) return false;
611 // Make sure this is a reg-reg copy. Note that we can't handle MCRF, because
612 // it takes more than one instruction to store it.
613 unsigned Opc = MI->getOpcode();
615 if ((Opc == PPC::OR &&
616 MI->getOperand(1).getReg() == MI->getOperand(2).getReg()))
618 else if ((Opc == PPC::OR8 &&
619 MI->getOperand(1).getReg() == MI->getOperand(2).getReg()))
621 else if (Opc == PPC::FMRD || Opc == PPC::FMRS)
628 bool PPCInstrInfo::BlockHasNoFallThrough(MachineBasicBlock &MBB) const {
629 if (MBB.empty()) return false;
631 switch (MBB.back().getOpcode()) {
632 case PPC::BLR: // Return.
633 case PPC::B: // Uncond branch.
634 case PPC::BCTR: // Indirect branch.
636 default: return false;
641 ReverseBranchCondition(std::vector<MachineOperand> &Cond) const {
642 assert(Cond.size() == 2 && "Invalid PPC branch opcode!");
643 // Leave the CR# the same, but invert the condition.
644 Cond[0].setImm(PPC::InvertPredicate((PPC::Predicate)Cond[0].getImm()));