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 /// getPointerRegClass - Return the register class to use to hold pointers.
34 /// This is used for addressing modes.
35 const TargetRegisterClass *PPCInstrInfo::getPointerRegClass() const {
36 if (TM.getSubtargetImpl()->isPPC64())
37 return &PPC::G8RCRegClass;
39 return &PPC::GPRCRegClass;
43 bool PPCInstrInfo::isMoveInstr(const MachineInstr& MI,
45 unsigned& destReg) const {
46 unsigned oc = MI.getOpcode();
47 if (oc == PPC::OR || oc == PPC::OR8 || oc == PPC::VOR ||
48 oc == PPC::OR4To8 || oc == PPC::OR8To4) { // or r1, r2, r2
49 assert(MI.getNumOperands() >= 3 &&
50 MI.getOperand(0).isRegister() &&
51 MI.getOperand(1).isRegister() &&
52 MI.getOperand(2).isRegister() &&
53 "invalid PPC OR instruction!");
54 if (MI.getOperand(1).getReg() == MI.getOperand(2).getReg()) {
55 sourceReg = MI.getOperand(1).getReg();
56 destReg = MI.getOperand(0).getReg();
59 } else if (oc == PPC::ADDI) { // addi r1, r2, 0
60 assert(MI.getNumOperands() >= 3 &&
61 MI.getOperand(0).isRegister() &&
62 MI.getOperand(2).isImmediate() &&
63 "invalid PPC ADDI instruction!");
64 if (MI.getOperand(1).isRegister() && MI.getOperand(2).getImm() == 0) {
65 sourceReg = MI.getOperand(1).getReg();
66 destReg = MI.getOperand(0).getReg();
69 } else if (oc == PPC::ORI) { // ori r1, r2, 0
70 assert(MI.getNumOperands() >= 3 &&
71 MI.getOperand(0).isRegister() &&
72 MI.getOperand(1).isRegister() &&
73 MI.getOperand(2).isImmediate() &&
74 "invalid PPC ORI instruction!");
75 if (MI.getOperand(2).getImm() == 0) {
76 sourceReg = MI.getOperand(1).getReg();
77 destReg = MI.getOperand(0).getReg();
80 } else if (oc == PPC::FMRS || oc == PPC::FMRD ||
81 oc == PPC::FMRSD) { // fmr r1, r2
82 assert(MI.getNumOperands() >= 2 &&
83 MI.getOperand(0).isRegister() &&
84 MI.getOperand(1).isRegister() &&
85 "invalid PPC FMR instruction");
86 sourceReg = MI.getOperand(1).getReg();
87 destReg = MI.getOperand(0).getReg();
89 } else if (oc == PPC::MCRF) { // mcrf cr1, cr2
90 assert(MI.getNumOperands() >= 2 &&
91 MI.getOperand(0).isRegister() &&
92 MI.getOperand(1).isRegister() &&
93 "invalid PPC MCRF instruction");
94 sourceReg = MI.getOperand(1).getReg();
95 destReg = MI.getOperand(0).getReg();
101 unsigned PPCInstrInfo::isLoadFromStackSlot(MachineInstr *MI,
102 int &FrameIndex) const {
103 switch (MI->getOpcode()) {
109 if (MI->getOperand(1).isImm() && !MI->getOperand(1).getImm() &&
110 MI->getOperand(2).isFI()) {
111 FrameIndex = MI->getOperand(2).getIndex();
112 return MI->getOperand(0).getReg();
119 unsigned PPCInstrInfo::isStoreToStackSlot(MachineInstr *MI,
120 int &FrameIndex) const {
121 switch (MI->getOpcode()) {
127 if (MI->getOperand(1).isImm() && !MI->getOperand(1).getImm() &&
128 MI->getOperand(2).isFI()) {
129 FrameIndex = MI->getOperand(2).getIndex();
130 return MI->getOperand(0).getReg();
137 // commuteInstruction - We can commute rlwimi instructions, but only if the
138 // rotate amt is zero. We also have to munge the immediates a bit.
140 PPCInstrInfo::commuteInstruction(MachineInstr *MI, bool NewMI) const {
141 MachineFunction &MF = *MI->getParent()->getParent();
143 // Normal instructions can be commuted the obvious way.
144 if (MI->getOpcode() != PPC::RLWIMI)
145 return TargetInstrInfoImpl::commuteInstruction(MI, NewMI);
147 // Cannot commute if it has a non-zero rotate count.
148 if (MI->getOperand(3).getImm() != 0)
151 // If we have a zero rotate count, we have:
153 // Op0 = (Op1 & ~M) | (Op2 & M)
155 // M = mask((ME+1)&31, (MB-1)&31)
156 // Op0 = (Op2 & ~M) | (Op1 & M)
159 unsigned Reg0 = MI->getOperand(0).getReg();
160 unsigned Reg1 = MI->getOperand(1).getReg();
161 unsigned Reg2 = MI->getOperand(2).getReg();
162 bool Reg1IsKill = MI->getOperand(1).isKill();
163 bool Reg2IsKill = MI->getOperand(2).isKill();
164 bool ChangeReg0 = false;
165 // If machine instrs are no longer in two-address forms, update
166 // destination register as well.
168 // Must be two address instruction!
169 assert(MI->getDesc().getOperandConstraint(0, TOI::TIED_TO) &&
170 "Expecting a two-address instruction!");
176 unsigned MB = MI->getOperand(4).getImm();
177 unsigned ME = MI->getOperand(5).getImm();
180 // Create a new instruction.
181 unsigned Reg0 = ChangeReg0 ? Reg2 : MI->getOperand(0).getReg();
182 bool Reg0IsDead = MI->getOperand(0).isDead();
183 return BuildMI(MF, MI->getDesc())
184 .addReg(Reg0, true, false, false, Reg0IsDead)
185 .addReg(Reg2, false, false, Reg2IsKill)
186 .addReg(Reg1, false, false, Reg1IsKill)
188 .addImm((MB-1) & 31);
192 MI->getOperand(0).setReg(Reg2);
193 MI->getOperand(2).setReg(Reg1);
194 MI->getOperand(1).setReg(Reg2);
195 MI->getOperand(2).setIsKill(Reg1IsKill);
196 MI->getOperand(1).setIsKill(Reg2IsKill);
198 // Swap the mask around.
199 MI->getOperand(4).setImm((ME+1) & 31);
200 MI->getOperand(5).setImm((MB-1) & 31);
204 void PPCInstrInfo::insertNoop(MachineBasicBlock &MBB,
205 MachineBasicBlock::iterator MI) const {
206 BuildMI(MBB, MI, get(PPC::NOP));
211 bool PPCInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,MachineBasicBlock *&TBB,
212 MachineBasicBlock *&FBB,
213 std::vector<MachineOperand> &Cond) const {
214 // If the block has no terminators, it just falls into the block after it.
215 MachineBasicBlock::iterator I = MBB.end();
216 if (I == MBB.begin() || !isUnpredicatedTerminator(--I))
219 // Get the last instruction in the block.
220 MachineInstr *LastInst = I;
222 // If there is only one terminator instruction, process it.
223 if (I == MBB.begin() || !isUnpredicatedTerminator(--I)) {
224 if (LastInst->getOpcode() == PPC::B) {
225 TBB = LastInst->getOperand(0).getMBB();
227 } else if (LastInst->getOpcode() == PPC::BCC) {
228 // Block ends with fall-through condbranch.
229 TBB = LastInst->getOperand(2).getMBB();
230 Cond.push_back(LastInst->getOperand(0));
231 Cond.push_back(LastInst->getOperand(1));
234 // Otherwise, don't know what this is.
238 // Get the instruction before it if it's a terminator.
239 MachineInstr *SecondLastInst = I;
241 // If there are three terminators, we don't know what sort of block this is.
242 if (SecondLastInst && I != MBB.begin() &&
243 isUnpredicatedTerminator(--I))
246 // If the block ends with PPC::B and PPC:BCC, handle it.
247 if (SecondLastInst->getOpcode() == PPC::BCC &&
248 LastInst->getOpcode() == PPC::B) {
249 TBB = SecondLastInst->getOperand(2).getMBB();
250 Cond.push_back(SecondLastInst->getOperand(0));
251 Cond.push_back(SecondLastInst->getOperand(1));
252 FBB = LastInst->getOperand(0).getMBB();
256 // If the block ends with two PPC:Bs, handle it. The second one is not
257 // executed, so remove it.
258 if (SecondLastInst->getOpcode() == PPC::B &&
259 LastInst->getOpcode() == PPC::B) {
260 TBB = SecondLastInst->getOperand(0).getMBB();
262 I->eraseFromParent();
266 // Otherwise, can't handle this.
270 unsigned PPCInstrInfo::RemoveBranch(MachineBasicBlock &MBB) const {
271 MachineBasicBlock::iterator I = MBB.end();
272 if (I == MBB.begin()) return 0;
274 if (I->getOpcode() != PPC::B && I->getOpcode() != PPC::BCC)
277 // Remove the branch.
278 I->eraseFromParent();
282 if (I == MBB.begin()) return 1;
284 if (I->getOpcode() != PPC::BCC)
287 // Remove the branch.
288 I->eraseFromParent();
293 PPCInstrInfo::InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
294 MachineBasicBlock *FBB,
295 const std::vector<MachineOperand> &Cond) const {
296 // Shouldn't be a fall through.
297 assert(TBB && "InsertBranch must not be told to insert a fallthrough");
298 assert((Cond.size() == 2 || Cond.size() == 0) &&
299 "PPC branch conditions have two components!");
303 if (Cond.empty()) // Unconditional branch
304 BuildMI(&MBB, get(PPC::B)).addMBB(TBB);
305 else // Conditional branch
306 BuildMI(&MBB, get(PPC::BCC))
307 .addImm(Cond[0].getImm()).addReg(Cond[1].getReg()).addMBB(TBB);
311 // Two-way Conditional Branch.
312 BuildMI(&MBB, get(PPC::BCC))
313 .addImm(Cond[0].getImm()).addReg(Cond[1].getReg()).addMBB(TBB);
314 BuildMI(&MBB, get(PPC::B)).addMBB(FBB);
318 void PPCInstrInfo::copyRegToReg(MachineBasicBlock &MBB,
319 MachineBasicBlock::iterator MI,
320 unsigned DestReg, unsigned SrcReg,
321 const TargetRegisterClass *DestRC,
322 const TargetRegisterClass *SrcRC) const {
323 if (DestRC != SrcRC) {
324 cerr << "Not yet supported!";
328 if (DestRC == PPC::GPRCRegisterClass) {
329 BuildMI(MBB, MI, get(PPC::OR), DestReg).addReg(SrcReg).addReg(SrcReg);
330 } else if (DestRC == PPC::G8RCRegisterClass) {
331 BuildMI(MBB, MI, get(PPC::OR8), DestReg).addReg(SrcReg).addReg(SrcReg);
332 } else if (DestRC == PPC::F4RCRegisterClass) {
333 BuildMI(MBB, MI, get(PPC::FMRS), DestReg).addReg(SrcReg);
334 } else if (DestRC == PPC::F8RCRegisterClass) {
335 BuildMI(MBB, MI, get(PPC::FMRD), DestReg).addReg(SrcReg);
336 } else if (DestRC == PPC::CRRCRegisterClass) {
337 BuildMI(MBB, MI, get(PPC::MCRF), DestReg).addReg(SrcReg);
338 } else if (DestRC == PPC::VRRCRegisterClass) {
339 BuildMI(MBB, MI, get(PPC::VOR), DestReg).addReg(SrcReg).addReg(SrcReg);
340 } else if (DestRC == PPC::CRBITRCRegisterClass) {
341 BuildMI(MBB, MI, get(PPC::CROR), DestReg).addReg(SrcReg).addReg(SrcReg);
343 cerr << "Attempt to copy register that is not GPR or FPR";
349 PPCInstrInfo::StoreRegToStackSlot(MachineFunction &MF,
350 unsigned SrcReg, bool isKill,
352 const TargetRegisterClass *RC,
353 SmallVectorImpl<MachineInstr*> &NewMIs) const{
354 if (RC == PPC::GPRCRegisterClass) {
355 if (SrcReg != PPC::LR) {
356 NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::STW))
357 .addReg(SrcReg, false, false, isKill),
360 // FIXME: this spills LR immediately to memory in one step. To do this,
361 // we use R11, which we know cannot be used in the prolog/epilog. This is
363 NewMIs.push_back(BuildMI(MF, get(PPC::MFLR), PPC::R11));
364 NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::STW))
365 .addReg(PPC::R11, false, false, isKill),
368 } else if (RC == PPC::G8RCRegisterClass) {
369 if (SrcReg != PPC::LR8) {
370 NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::STD))
371 .addReg(SrcReg, false, false, isKill), FrameIdx));
373 // FIXME: this spills LR immediately to memory in one step. To do this,
374 // we use R11, which we know cannot be used in the prolog/epilog. This is
376 NewMIs.push_back(BuildMI(MF, get(PPC::MFLR8), PPC::X11));
377 NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::STD))
378 .addReg(PPC::X11, false, false, isKill), FrameIdx));
380 } else if (RC == PPC::F8RCRegisterClass) {
381 NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::STFD))
382 .addReg(SrcReg, false, false, isKill), FrameIdx));
383 } else if (RC == PPC::F4RCRegisterClass) {
384 NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::STFS))
385 .addReg(SrcReg, false, false, isKill), FrameIdx));
386 } else if (RC == PPC::CRRCRegisterClass) {
387 if ((EnablePPC32RS && !TM.getSubtargetImpl()->isPPC64()) ||
388 (EnablePPC64RS && TM.getSubtargetImpl()->isPPC64())) {
389 // FIXME (64-bit): Enable
390 NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::SPILL_CR))
391 .addReg(SrcReg, false, false, isKill),
395 // FIXME: We use R0 here, because it isn't available for RA. We need to
396 // store the CR in the low 4-bits of the saved value. First, issue a MFCR
397 // to save all of the CRBits.
398 NewMIs.push_back(BuildMI(MF, get(PPC::MFCR), PPC::R0));
400 // If the saved register wasn't CR0, shift the bits left so that they are
402 if (SrcReg != PPC::CR0) {
403 unsigned ShiftBits = PPCRegisterInfo::getRegisterNumbering(SrcReg)*4;
404 // rlwinm r0, r0, ShiftBits, 0, 31.
405 NewMIs.push_back(BuildMI(MF, get(PPC::RLWINM), PPC::R0)
406 .addReg(PPC::R0).addImm(ShiftBits).addImm(0).addImm(31));
409 NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::STW))
410 .addReg(PPC::R0, false, false, isKill),
413 } else if (RC == PPC::CRBITRCRegisterClass) {
414 // FIXME: We use CRi here because there is no mtcrf on a bit. Since the
415 // backend currently only uses CR1EQ as an individual bit, this should
416 // not cause any bug. If we need other uses of CR bits, the following
417 // code may be invalid.
419 if (SrcReg >= PPC::CR0LT || SrcReg <= PPC::CR0UN)
421 else if (SrcReg >= PPC::CR1LT || SrcReg <= PPC::CR1UN)
423 else if (SrcReg >= PPC::CR2LT || SrcReg <= PPC::CR2UN)
425 else if (SrcReg >= PPC::CR3LT || SrcReg <= PPC::CR3UN)
427 else if (SrcReg >= PPC::CR4LT || SrcReg <= PPC::CR4UN)
429 else if (SrcReg >= PPC::CR5LT || SrcReg <= PPC::CR5UN)
431 else if (SrcReg >= PPC::CR6LT || SrcReg <= PPC::CR6UN)
433 else if (SrcReg >= PPC::CR7LT || SrcReg <= PPC::CR7UN)
436 return StoreRegToStackSlot(MF, Reg, isKill, FrameIdx,
437 PPC::CRRCRegisterClass, NewMIs);
439 } else if (RC == PPC::VRRCRegisterClass) {
440 // We don't have indexed addressing for vector loads. Emit:
444 // FIXME: We use R0 here, because it isn't available for RA.
445 NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::ADDI), PPC::R0),
447 NewMIs.push_back(BuildMI(MF, get(PPC::STVX))
448 .addReg(SrcReg, false, false, isKill).addReg(PPC::R0).addReg(PPC::R0));
450 assert(0 && "Unknown regclass!");
458 PPCInstrInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
459 MachineBasicBlock::iterator MI,
460 unsigned SrcReg, bool isKill, int FrameIdx,
461 const TargetRegisterClass *RC) const {
462 MachineFunction &MF = *MBB.getParent();
463 SmallVector<MachineInstr*, 4> NewMIs;
465 if (StoreRegToStackSlot(MF, SrcReg, isKill, FrameIdx, RC, NewMIs)) {
466 PPCFunctionInfo *FuncInfo = MF.getInfo<PPCFunctionInfo>();
467 FuncInfo->setSpillsCR();
470 for (unsigned i = 0, e = NewMIs.size(); i != e; ++i)
471 MBB.insert(MI, NewMIs[i]);
474 void PPCInstrInfo::storeRegToAddr(MachineFunction &MF, unsigned SrcReg,
476 SmallVectorImpl<MachineOperand> &Addr,
477 const TargetRegisterClass *RC,
478 SmallVectorImpl<MachineInstr*> &NewMIs) const{
479 if (Addr[0].isFrameIndex()) {
480 if (StoreRegToStackSlot(MF, SrcReg, isKill,
481 Addr[0].getIndex(), RC, NewMIs)) {
482 PPCFunctionInfo *FuncInfo = MF.getInfo<PPCFunctionInfo>();
483 FuncInfo->setSpillsCR();
490 if (RC == PPC::GPRCRegisterClass) {
492 } else if (RC == PPC::G8RCRegisterClass) {
494 } else if (RC == PPC::F8RCRegisterClass) {
496 } else if (RC == PPC::F4RCRegisterClass) {
498 } else if (RC == PPC::VRRCRegisterClass) {
501 assert(0 && "Unknown regclass!");
504 MachineInstrBuilder MIB = BuildMI(MF, get(Opc))
505 .addReg(SrcReg, false, false, isKill);
506 for (unsigned i = 0, e = Addr.size(); i != e; ++i) {
507 MachineOperand &MO = Addr[i];
509 MIB.addReg(MO.getReg());
510 else if (MO.isImmediate())
511 MIB.addImm(MO.getImm());
513 MIB.addFrameIndex(MO.getIndex());
515 NewMIs.push_back(MIB);
520 PPCInstrInfo::LoadRegFromStackSlot(MachineFunction &MF,
521 unsigned DestReg, int FrameIdx,
522 const TargetRegisterClass *RC,
523 SmallVectorImpl<MachineInstr*> &NewMIs)const{
524 if (RC == PPC::GPRCRegisterClass) {
525 if (DestReg != PPC::LR) {
526 NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::LWZ), DestReg),
529 NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::LWZ), PPC::R11),
531 NewMIs.push_back(BuildMI(MF, get(PPC::MTLR)).addReg(PPC::R11));
533 } else if (RC == PPC::G8RCRegisterClass) {
534 if (DestReg != PPC::LR8) {
535 NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::LD), DestReg),
538 NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::LD), PPC::R11),
540 NewMIs.push_back(BuildMI(MF, get(PPC::MTLR8)).addReg(PPC::R11));
542 } else if (RC == PPC::F8RCRegisterClass) {
543 NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::LFD), DestReg),
545 } else if (RC == PPC::F4RCRegisterClass) {
546 NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::LFS), DestReg),
548 } else if (RC == PPC::CRRCRegisterClass) {
549 // FIXME: We use R0 here, because it isn't available for RA.
550 NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::LWZ), PPC::R0),
553 // If the reloaded register isn't CR0, shift the bits right so that they are
554 // in the right CR's slot.
555 if (DestReg != PPC::CR0) {
556 unsigned ShiftBits = PPCRegisterInfo::getRegisterNumbering(DestReg)*4;
557 // rlwinm r11, r11, 32-ShiftBits, 0, 31.
558 NewMIs.push_back(BuildMI(MF, get(PPC::RLWINM), PPC::R0)
559 .addReg(PPC::R0).addImm(32-ShiftBits).addImm(0).addImm(31));
562 NewMIs.push_back(BuildMI(MF, get(PPC::MTCRF), DestReg).addReg(PPC::R0));
563 } else if (RC == PPC::CRBITRCRegisterClass) {
566 if (DestReg >= PPC::CR0LT || DestReg <= PPC::CR0UN)
568 else if (DestReg >= PPC::CR1LT || DestReg <= PPC::CR1UN)
570 else if (DestReg >= PPC::CR2LT || DestReg <= PPC::CR2UN)
572 else if (DestReg >= PPC::CR3LT || DestReg <= PPC::CR3UN)
574 else if (DestReg >= PPC::CR4LT || DestReg <= PPC::CR4UN)
576 else if (DestReg >= PPC::CR5LT || DestReg <= PPC::CR5UN)
578 else if (DestReg >= PPC::CR6LT || DestReg <= PPC::CR6UN)
580 else if (DestReg >= PPC::CR7LT || DestReg <= PPC::CR7UN)
583 return LoadRegFromStackSlot(MF, Reg, FrameIdx,
584 PPC::CRRCRegisterClass, NewMIs);
586 } else if (RC == PPC::VRRCRegisterClass) {
587 // We don't have indexed addressing for vector loads. Emit:
591 // FIXME: We use R0 here, because it isn't available for RA.
592 NewMIs.push_back(addFrameReference(BuildMI(MF, get(PPC::ADDI), PPC::R0),
594 NewMIs.push_back(BuildMI(MF, get(PPC::LVX),DestReg).addReg(PPC::R0)
597 assert(0 && "Unknown regclass!");
603 PPCInstrInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
604 MachineBasicBlock::iterator MI,
605 unsigned DestReg, int FrameIdx,
606 const TargetRegisterClass *RC) const {
607 MachineFunction &MF = *MBB.getParent();
608 SmallVector<MachineInstr*, 4> NewMIs;
609 LoadRegFromStackSlot(MF, DestReg, FrameIdx, RC, NewMIs);
610 for (unsigned i = 0, e = NewMIs.size(); i != e; ++i)
611 MBB.insert(MI, NewMIs[i]);
614 void PPCInstrInfo::loadRegFromAddr(MachineFunction &MF, unsigned DestReg,
615 SmallVectorImpl<MachineOperand> &Addr,
616 const TargetRegisterClass *RC,
617 SmallVectorImpl<MachineInstr*> &NewMIs)const{
618 if (Addr[0].isFrameIndex()) {
619 LoadRegFromStackSlot(MF, DestReg, Addr[0].getIndex(), RC, NewMIs);
624 if (RC == PPC::GPRCRegisterClass) {
625 assert(DestReg != PPC::LR && "Can't handle this yet!");
627 } else if (RC == PPC::G8RCRegisterClass) {
628 assert(DestReg != PPC::LR8 && "Can't handle this yet!");
630 } else if (RC == PPC::F8RCRegisterClass) {
632 } else if (RC == PPC::F4RCRegisterClass) {
634 } else if (RC == PPC::VRRCRegisterClass) {
637 assert(0 && "Unknown regclass!");
640 MachineInstrBuilder MIB = BuildMI(MF, get(Opc), DestReg);
641 for (unsigned i = 0, e = Addr.size(); i != e; ++i) {
642 MachineOperand &MO = Addr[i];
644 MIB.addReg(MO.getReg());
645 else if (MO.isImmediate())
646 MIB.addImm(MO.getImm());
648 MIB.addFrameIndex(MO.getIndex());
650 NewMIs.push_back(MIB);
654 /// foldMemoryOperand - PowerPC (like most RISC's) can only fold spills into
655 /// copy instructions, turning them into load/store instructions.
656 MachineInstr *PPCInstrInfo::foldMemoryOperand(MachineFunction &MF,
658 SmallVectorImpl<unsigned> &Ops,
659 int FrameIndex) const {
660 if (Ops.size() != 1) return NULL;
662 // Make sure this is a reg-reg copy. Note that we can't handle MCRF, because
663 // it takes more than one instruction to store it.
664 unsigned Opc = MI->getOpcode();
665 unsigned OpNum = Ops[0];
667 MachineInstr *NewMI = NULL;
668 if ((Opc == PPC::OR &&
669 MI->getOperand(1).getReg() == MI->getOperand(2).getReg())) {
670 if (OpNum == 0) { // move -> store
671 unsigned InReg = MI->getOperand(1).getReg();
672 bool isKill = MI->getOperand(1).isKill();
673 NewMI = addFrameReference(BuildMI(MF, get(PPC::STW))
674 .addReg(InReg, false, false, isKill),
676 } else { // move -> load
677 unsigned OutReg = MI->getOperand(0).getReg();
678 bool isDead = MI->getOperand(0).isDead();
679 NewMI = addFrameReference(BuildMI(MF, get(PPC::LWZ))
680 .addReg(OutReg, true, false, false, isDead),
683 } else if ((Opc == PPC::OR8 &&
684 MI->getOperand(1).getReg() == MI->getOperand(2).getReg())) {
685 if (OpNum == 0) { // move -> store
686 unsigned InReg = MI->getOperand(1).getReg();
687 bool isKill = MI->getOperand(1).isKill();
688 NewMI = addFrameReference(BuildMI(MF, get(PPC::STD))
689 .addReg(InReg, false, false, isKill),
691 } else { // move -> load
692 unsigned OutReg = MI->getOperand(0).getReg();
693 bool isDead = MI->getOperand(0).isDead();
694 NewMI = addFrameReference(BuildMI(MF, get(PPC::LD))
695 .addReg(OutReg, true, false, false, isDead),
698 } else if (Opc == PPC::FMRD) {
699 if (OpNum == 0) { // move -> store
700 unsigned InReg = MI->getOperand(1).getReg();
701 bool isKill = MI->getOperand(1).isKill();
702 NewMI = addFrameReference(BuildMI(MF, get(PPC::STFD))
703 .addReg(InReg, false, false, isKill),
705 } else { // move -> load
706 unsigned OutReg = MI->getOperand(0).getReg();
707 bool isDead = MI->getOperand(0).isDead();
708 NewMI = addFrameReference(BuildMI(MF, get(PPC::LFD))
709 .addReg(OutReg, true, false, false, isDead),
712 } else if (Opc == PPC::FMRS) {
713 if (OpNum == 0) { // move -> store
714 unsigned InReg = MI->getOperand(1).getReg();
715 bool isKill = MI->getOperand(1).isKill();
716 NewMI = addFrameReference(BuildMI(MF, get(PPC::STFS))
717 .addReg(InReg, false, false, isKill),
719 } else { // move -> load
720 unsigned OutReg = MI->getOperand(0).getReg();
721 bool isDead = MI->getOperand(0).isDead();
722 NewMI = addFrameReference(BuildMI(MF, get(PPC::LFS))
723 .addReg(OutReg, true, false, false, isDead),
731 bool PPCInstrInfo::canFoldMemoryOperand(MachineInstr *MI,
732 SmallVectorImpl<unsigned> &Ops) const {
733 if (Ops.size() != 1) return false;
735 // Make sure this is a reg-reg copy. Note that we can't handle MCRF, because
736 // it takes more than one instruction to store it.
737 unsigned Opc = MI->getOpcode();
739 if ((Opc == PPC::OR &&
740 MI->getOperand(1).getReg() == MI->getOperand(2).getReg()))
742 else if ((Opc == PPC::OR8 &&
743 MI->getOperand(1).getReg() == MI->getOperand(2).getReg()))
745 else if (Opc == PPC::FMRD || Opc == PPC::FMRS)
752 bool PPCInstrInfo::BlockHasNoFallThrough(MachineBasicBlock &MBB) const {
753 if (MBB.empty()) return false;
755 switch (MBB.back().getOpcode()) {
756 case PPC::BLR: // Return.
757 case PPC::B: // Uncond branch.
758 case PPC::BCTR: // Indirect branch.
760 default: return false;
765 ReverseBranchCondition(std::vector<MachineOperand> &Cond) const {
766 assert(Cond.size() == 2 && "Invalid PPC branch opcode!");
767 // Leave the CR# the same, but invert the condition.
768 Cond[0].setImm(PPC::InvertPredicate((PPC::Predicate)Cond[0].getImm()));
772 /// GetInstSize - Return the number of bytes of code the specified
773 /// instruction may be. This returns the maximum number of bytes.
775 unsigned PPCInstrInfo::GetInstSizeInBytes(const MachineInstr *MI) const {
776 switch (MI->getOpcode()) {
777 case PPC::INLINEASM: { // Inline Asm: Variable size.
778 const MachineFunction *MF = MI->getParent()->getParent();
779 const char *AsmStr = MI->getOperand(0).getSymbolName();
780 return MF->getTarget().getTargetAsmInfo()->getInlineAsmLength(AsmStr);
787 return 4; // PowerPC instructions are all 4 bytes