PPCInstrInfo.cpp revision 3ea1b064a0b9c3d161b0f77a9e957970f98907ab 
1//===-- PPCInstrInfo.cpp - PowerPC Instruction Information ----------------===//
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 contains the PowerPC implementation of the TargetInstrInfo class.
11//
12//===----------------------------------------------------------------------===//
13
14#include "PPCInstrInfo.h"
15#include "MCTargetDesc/PPCPredicates.h"
16#include "PPC.h"
17#include "PPCHazardRecognizers.h"
18#include "PPCInstrBuilder.h"
19#include "PPCMachineFunctionInfo.h"
20#include "PPCTargetMachine.h"
21#include "llvm/ADT/STLExtras.h"
22#include "llvm/CodeGen/MachineFrameInfo.h"
23#include "llvm/CodeGen/MachineInstrBuilder.h"
24#include "llvm/CodeGen/MachineMemOperand.h"
25#include "llvm/CodeGen/MachineRegisterInfo.h"
26#include "llvm/CodeGen/PseudoSourceValue.h"
27#include "llvm/MC/MCAsmInfo.h"
28#include "llvm/Support/CommandLine.h"
29#include "llvm/Support/ErrorHandling.h"
30#include "llvm/Support/TargetRegistry.h"
31#include "llvm/Support/raw_ostream.h"
32
33#define GET_INSTRINFO_CTOR
34#include "PPCGenInstrInfo.inc"
35
36using namespace llvm;
37
38static cl::
39opt<bool> DisableCTRLoopAnal("disable-ppc-ctrloop-analysis", cl::Hidden,
40            cl::desc("Disable analysis for CTR loops"));
41
42PPCInstrInfo::PPCInstrInfo(PPCTargetMachine &tm)
43  : PPCGenInstrInfo(PPC::ADJCALLSTACKDOWN, PPC::ADJCALLSTACKUP),
44    TM(tm), RI(*TM.getSubtargetImpl(), *this) {}
45
46/// CreateTargetHazardRecognizer - Return the hazard recognizer to use for
47/// this target when scheduling the DAG.
48ScheduleHazardRecognizer *PPCInstrInfo::CreateTargetHazardRecognizer(
49  const TargetMachine *TM,
50  const ScheduleDAG *DAG) const {
51  unsigned Directive = TM->getSubtarget<PPCSubtarget>().getDarwinDirective();
52  if (Directive == PPC::DIR_440 || Directive == PPC::DIR_A2 ||
53      Directive == PPC::DIR_E500mc || Directive == PPC::DIR_E5500) {
54    const InstrItineraryData *II = TM->getInstrItineraryData();
55    return new PPCScoreboardHazardRecognizer(II, DAG);
56  }
57
58  return TargetInstrInfo::CreateTargetHazardRecognizer(TM, DAG);
59}
60
61/// CreateTargetPostRAHazardRecognizer - Return the postRA hazard recognizer
62/// to use for this target when scheduling the DAG.
63ScheduleHazardRecognizer *PPCInstrInfo::CreateTargetPostRAHazardRecognizer(
64  const InstrItineraryData *II,
65  const ScheduleDAG *DAG) const {
66  unsigned Directive = TM.getSubtarget<PPCSubtarget>().getDarwinDirective();
67
68  // Most subtargets use a PPC970 recognizer.
69  if (Directive != PPC::DIR_440 && Directive != PPC::DIR_A2 &&
70      Directive != PPC::DIR_E500mc && Directive != PPC::DIR_E5500) {
71    const TargetInstrInfo *TII = TM.getInstrInfo();
72    assert(TII && "No InstrInfo?");
73
74    return new PPCHazardRecognizer970(*TII);
75  }
76
77  return new PPCScoreboardHazardRecognizer(II, DAG);
78}
79
80// Detect 32 -> 64-bit extensions where we may reuse the low sub-register.
81bool PPCInstrInfo::isCoalescableExtInstr(const MachineInstr &MI,
82                                         unsigned &SrcReg, unsigned &DstReg,
83                                         unsigned &SubIdx) const {
84  switch (MI.getOpcode()) {
85  default: return false;
86  case PPC::EXTSW:
87  case PPC::EXTSW_32_64:
88    SrcReg = MI.getOperand(1).getReg();
89    DstReg = MI.getOperand(0).getReg();
90    SubIdx = PPC::sub_32;
91    return true;
92  }
93}
94
95unsigned PPCInstrInfo::isLoadFromStackSlot(const MachineInstr *MI,
96                                           int &FrameIndex) const {
97  switch (MI->getOpcode()) {
98  default: break;
99  case PPC::LD:
100  case PPC::LWZ:
101  case PPC::LFS:
102  case PPC::LFD:
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();
107    }
108    break;
109  }
110  return 0;
111}
112
113unsigned PPCInstrInfo::isStoreToStackSlot(const MachineInstr *MI,
114                                          int &FrameIndex) const {
115  switch (MI->getOpcode()) {
116  default: break;
117  case PPC::STD:
118  case PPC::STW:
119  case PPC::STFS:
120  case PPC::STFD:
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();
125    }
126    break;
127  }
128  return 0;
129}
130
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.
133MachineInstr *
134PPCInstrInfo::commuteInstruction(MachineInstr *MI, bool NewMI) const {
135  MachineFunction &MF = *MI->getParent()->getParent();
136
137  // Normal instructions can be commuted the obvious way.
138  if (MI->getOpcode() != PPC::RLWIMI)
139    return TargetInstrInfo::commuteInstruction(MI, NewMI);
140
141  // Cannot commute if it has a non-zero rotate count.
142  if (MI->getOperand(3).getImm() != 0)
143    return 0;
144
145  // If we have a zero rotate count, we have:
146  //   M = mask(MB,ME)
147  //   Op0 = (Op1 & ~M) | (Op2 & M)
148  // Change this to:
149  //   M = mask((ME+1)&31, (MB-1)&31)
150  //   Op0 = (Op2 & ~M) | (Op1 & M)
151
152  // Swap op1/op2
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.
161  if (Reg0 == Reg1) {
162    // Must be two address instruction!
163    assert(MI->getDesc().getOperandConstraint(0, MCOI::TIED_TO) &&
164           "Expecting a two-address instruction!");
165    Reg2IsKill = false;
166    ChangeReg0 = true;
167  }
168
169  // Masks.
170  unsigned MB = MI->getOperand(4).getImm();
171  unsigned ME = MI->getOperand(5).getImm();
172
173  if (NewMI) {
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->getDebugLoc(), MI->getDesc())
178      .addReg(Reg0, RegState::Define | getDeadRegState(Reg0IsDead))
179      .addReg(Reg2, getKillRegState(Reg2IsKill))
180      .addReg(Reg1, getKillRegState(Reg1IsKill))
181      .addImm((ME+1) & 31)
182      .addImm((MB-1) & 31);
183  }
184
185  if (ChangeReg0)
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);
191
192  // Swap the mask around.
193  MI->getOperand(4).setImm((ME+1) & 31);
194  MI->getOperand(5).setImm((MB-1) & 31);
195  return MI;
196}
197
198void PPCInstrInfo::insertNoop(MachineBasicBlock &MBB,
199                              MachineBasicBlock::iterator MI) const {
200  DebugLoc DL;
201  BuildMI(MBB, MI, DL, get(PPC::NOP));
202}
203
204
205// Branch analysis.
206// Note: If the condition register is set to CTR or CTR8 then this is a
207// BDNZ (imm == 1) or BDZ (imm == 0) branch.
208bool PPCInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,MachineBasicBlock *&TBB,
209                                 MachineBasicBlock *&FBB,
210                                 SmallVectorImpl<MachineOperand> &Cond,
211                                 bool AllowModify) const {
212  bool isPPC64 = TM.getSubtargetImpl()->isPPC64();
213
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())
217    return false;
218  --I;
219  while (I->isDebugValue()) {
220    if (I == MBB.begin())
221      return false;
222    --I;
223  }
224  if (!isUnpredicatedTerminator(I))
225    return false;
226
227  // Get the last instruction in the block.
228  MachineInstr *LastInst = I;
229
230  // If there is only one terminator instruction, process it.
231  if (I == MBB.begin() || !isUnpredicatedTerminator(--I)) {
232    if (LastInst->getOpcode() == PPC::B) {
233      if (!LastInst->getOperand(0).isMBB())
234        return true;
235      TBB = LastInst->getOperand(0).getMBB();
236      return false;
237    } else if (LastInst->getOpcode() == PPC::BCC) {
238      if (!LastInst->getOperand(2).isMBB())
239        return true;
240      // Block ends with fall-through condbranch.
241      TBB = LastInst->getOperand(2).getMBB();
242      Cond.push_back(LastInst->getOperand(0));
243      Cond.push_back(LastInst->getOperand(1));
244      return false;
245    } else if (LastInst->getOpcode() == PPC::BDNZ8 ||
246               LastInst->getOpcode() == PPC::BDNZ) {
247      if (!LastInst->getOperand(0).isMBB())
248        return true;
249      if (DisableCTRLoopAnal)
250        return true;
251      TBB = LastInst->getOperand(0).getMBB();
252      Cond.push_back(MachineOperand::CreateImm(1));
253      Cond.push_back(MachineOperand::CreateReg(isPPC64 ? PPC::CTR8 : PPC::CTR,
254                                               true));
255      return false;
256    } else if (LastInst->getOpcode() == PPC::BDZ8 ||
257               LastInst->getOpcode() == PPC::BDZ) {
258      if (!LastInst->getOperand(0).isMBB())
259        return true;
260      if (DisableCTRLoopAnal)
261        return true;
262      TBB = LastInst->getOperand(0).getMBB();
263      Cond.push_back(MachineOperand::CreateImm(0));
264      Cond.push_back(MachineOperand::CreateReg(isPPC64 ? PPC::CTR8 : PPC::CTR,
265                                               true));
266      return false;
267    }
268
269    // Otherwise, don't know what this is.
270    return true;
271  }
272
273  // Get the instruction before it if it's a terminator.
274  MachineInstr *SecondLastInst = I;
275
276  // If there are three terminators, we don't know what sort of block this is.
277  if (SecondLastInst && I != MBB.begin() &&
278      isUnpredicatedTerminator(--I))
279    return true;
280
281  // If the block ends with PPC::B and PPC:BCC, handle it.
282  if (SecondLastInst->getOpcode() == PPC::BCC &&
283      LastInst->getOpcode() == PPC::B) {
284    if (!SecondLastInst->getOperand(2).isMBB() ||
285        !LastInst->getOperand(0).isMBB())
286      return true;
287    TBB =  SecondLastInst->getOperand(2).getMBB();
288    Cond.push_back(SecondLastInst->getOperand(0));
289    Cond.push_back(SecondLastInst->getOperand(1));
290    FBB = LastInst->getOperand(0).getMBB();
291    return false;
292  } else if ((SecondLastInst->getOpcode() == PPC::BDNZ8 ||
293              SecondLastInst->getOpcode() == PPC::BDNZ) &&
294      LastInst->getOpcode() == PPC::B) {
295    if (!SecondLastInst->getOperand(0).isMBB() ||
296        !LastInst->getOperand(0).isMBB())
297      return true;
298    if (DisableCTRLoopAnal)
299      return true;
300    TBB = SecondLastInst->getOperand(0).getMBB();
301    Cond.push_back(MachineOperand::CreateImm(1));
302    Cond.push_back(MachineOperand::CreateReg(isPPC64 ? PPC::CTR8 : PPC::CTR,
303                                             true));
304    FBB = LastInst->getOperand(0).getMBB();
305    return false;
306  } else if ((SecondLastInst->getOpcode() == PPC::BDZ8 ||
307              SecondLastInst->getOpcode() == PPC::BDZ) &&
308      LastInst->getOpcode() == PPC::B) {
309    if (!SecondLastInst->getOperand(0).isMBB() ||
310        !LastInst->getOperand(0).isMBB())
311      return true;
312    if (DisableCTRLoopAnal)
313      return true;
314    TBB = SecondLastInst->getOperand(0).getMBB();
315    Cond.push_back(MachineOperand::CreateImm(0));
316    Cond.push_back(MachineOperand::CreateReg(isPPC64 ? PPC::CTR8 : PPC::CTR,
317                                             true));
318    FBB = LastInst->getOperand(0).getMBB();
319    return false;
320  }
321
322  // If the block ends with two PPC:Bs, handle it.  The second one is not
323  // executed, so remove it.
324  if (SecondLastInst->getOpcode() == PPC::B &&
325      LastInst->getOpcode() == PPC::B) {
326    if (!SecondLastInst->getOperand(0).isMBB())
327      return true;
328    TBB = SecondLastInst->getOperand(0).getMBB();
329    I = LastInst;
330    if (AllowModify)
331      I->eraseFromParent();
332    return false;
333  }
334
335  // Otherwise, can't handle this.
336  return true;
337}
338
339unsigned PPCInstrInfo::RemoveBranch(MachineBasicBlock &MBB) const {
340  MachineBasicBlock::iterator I = MBB.end();
341  if (I == MBB.begin()) return 0;
342  --I;
343  while (I->isDebugValue()) {
344    if (I == MBB.begin())
345      return 0;
346    --I;
347  }
348  if (I->getOpcode() != PPC::B && I->getOpcode() != PPC::BCC &&
349      I->getOpcode() != PPC::BDNZ8 && I->getOpcode() != PPC::BDNZ &&
350      I->getOpcode() != PPC::BDZ8  && I->getOpcode() != PPC::BDZ)
351    return 0;
352
353  // Remove the branch.
354  I->eraseFromParent();
355
356  I = MBB.end();
357
358  if (I == MBB.begin()) return 1;
359  --I;
360  if (I->getOpcode() != PPC::BCC &&
361      I->getOpcode() != PPC::BDNZ8 && I->getOpcode() != PPC::BDNZ &&
362      I->getOpcode() != PPC::BDZ8  && I->getOpcode() != PPC::BDZ)
363    return 1;
364
365  // Remove the branch.
366  I->eraseFromParent();
367  return 2;
368}
369
370unsigned
371PPCInstrInfo::InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
372                           MachineBasicBlock *FBB,
373                           const SmallVectorImpl<MachineOperand> &Cond,
374                           DebugLoc DL) const {
375  // Shouldn't be a fall through.
376  assert(TBB && "InsertBranch must not be told to insert a fallthrough");
377  assert((Cond.size() == 2 || Cond.size() == 0) &&
378         "PPC branch conditions have two components!");
379
380  bool isPPC64 = TM.getSubtargetImpl()->isPPC64();
381
382  // One-way branch.
383  if (FBB == 0) {
384    if (Cond.empty())   // Unconditional branch
385      BuildMI(&MBB, DL, get(PPC::B)).addMBB(TBB);
386    else if (Cond[1].getReg() == PPC::CTR || Cond[1].getReg() == PPC::CTR8)
387      BuildMI(&MBB, DL, get(Cond[0].getImm() ?
388                              (isPPC64 ? PPC::BDNZ8 : PPC::BDNZ) :
389                              (isPPC64 ? PPC::BDZ8  : PPC::BDZ))).addMBB(TBB);
390    else                // Conditional branch
391      BuildMI(&MBB, DL, get(PPC::BCC))
392        .addImm(Cond[0].getImm()).addReg(Cond[1].getReg()).addMBB(TBB);
393    return 1;
394  }
395
396  // Two-way Conditional Branch.
397  if (Cond[1].getReg() == PPC::CTR || Cond[1].getReg() == PPC::CTR8)
398    BuildMI(&MBB, DL, get(Cond[0].getImm() ?
399                            (isPPC64 ? PPC::BDNZ8 : PPC::BDNZ) :
400                            (isPPC64 ? PPC::BDZ8  : PPC::BDZ))).addMBB(TBB);
401  else
402    BuildMI(&MBB, DL, get(PPC::BCC))
403      .addImm(Cond[0].getImm()).addReg(Cond[1].getReg()).addMBB(TBB);
404  BuildMI(&MBB, DL, get(PPC::B)).addMBB(FBB);
405  return 2;
406}
407
408void PPCInstrInfo::copyPhysReg(MachineBasicBlock &MBB,
409                               MachineBasicBlock::iterator I, DebugLoc DL,
410                               unsigned DestReg, unsigned SrcReg,
411                               bool KillSrc) const {
412  unsigned Opc;
413  if (PPC::GPRCRegClass.contains(DestReg, SrcReg))
414    Opc = PPC::OR;
415  else if (PPC::G8RCRegClass.contains(DestReg, SrcReg))
416    Opc = PPC::OR8;
417  else if (PPC::F4RCRegClass.contains(DestReg, SrcReg))
418    Opc = PPC::FMR;
419  else if (PPC::CRRCRegClass.contains(DestReg, SrcReg))
420    Opc = PPC::MCRF;
421  else if (PPC::VRRCRegClass.contains(DestReg, SrcReg))
422    Opc = PPC::VOR;
423  else if (PPC::CRBITRCRegClass.contains(DestReg, SrcReg))
424    Opc = PPC::CROR;
425  else
426    llvm_unreachable("Impossible reg-to-reg copy");
427
428  const MCInstrDesc &MCID = get(Opc);
429  if (MCID.getNumOperands() == 3)
430    BuildMI(MBB, I, DL, MCID, DestReg)
431      .addReg(SrcReg).addReg(SrcReg, getKillRegState(KillSrc));
432  else
433    BuildMI(MBB, I, DL, MCID, DestReg).addReg(SrcReg, getKillRegState(KillSrc));
434}
435
436// This function returns true if a CR spill is necessary and false otherwise.
437bool
438PPCInstrInfo::StoreRegToStackSlot(MachineFunction &MF,
439                                  unsigned SrcReg, bool isKill,
440                                  int FrameIdx,
441                                  const TargetRegisterClass *RC,
442                                  SmallVectorImpl<MachineInstr*> &NewMIs,
443                                  bool &NonRI) const{
444  DebugLoc DL;
445  if (PPC::GPRCRegClass.hasSubClassEq(RC)) {
446    if (SrcReg != PPC::LR) {
447      NewMIs.push_back(addFrameReference(BuildMI(MF, DL, get(PPC::STW))
448                                         .addReg(SrcReg,
449                                                 getKillRegState(isKill)),
450                                         FrameIdx));
451    } else {
452      // FIXME: this spills LR immediately to memory in one step.  To do this,
453      // we use R11, which we know cannot be used in the prolog/epilog.  This is
454      // a hack.
455      NewMIs.push_back(BuildMI(MF, DL, get(PPC::MFLR), PPC::R11));
456      NewMIs.push_back(addFrameReference(BuildMI(MF, DL, get(PPC::STW))
457                                         .addReg(PPC::R11,
458                                                 getKillRegState(isKill)),
459                                         FrameIdx));
460    }
461  } else if (PPC::G8RCRegClass.hasSubClassEq(RC)) {
462    if (SrcReg != PPC::LR8) {
463      NewMIs.push_back(addFrameReference(BuildMI(MF, DL, get(PPC::STD))
464                                         .addReg(SrcReg,
465                                                 getKillRegState(isKill)),
466                                         FrameIdx));
467    } else {
468      // FIXME: this spills LR immediately to memory in one step.  To do this,
469      // we use X11, which we know cannot be used in the prolog/epilog.  This is
470      // a hack.
471      NewMIs.push_back(BuildMI(MF, DL, get(PPC::MFLR8), PPC::X11));
472      NewMIs.push_back(addFrameReference(BuildMI(MF, DL, get(PPC::STD))
473                                         .addReg(PPC::X11,
474                                                 getKillRegState(isKill)),
475                                         FrameIdx));
476    }
477  } else if (PPC::F8RCRegClass.hasSubClassEq(RC)) {
478    NewMIs.push_back(addFrameReference(BuildMI(MF, DL, get(PPC::STFD))
479                                       .addReg(SrcReg,
480                                               getKillRegState(isKill)),
481                                       FrameIdx));
482  } else if (PPC::F4RCRegClass.hasSubClassEq(RC)) {
483    NewMIs.push_back(addFrameReference(BuildMI(MF, DL, get(PPC::STFS))
484                                       .addReg(SrcReg,
485                                               getKillRegState(isKill)),
486                                       FrameIdx));
487  } else if (PPC::CRRCRegClass.hasSubClassEq(RC)) {
488    NewMIs.push_back(addFrameReference(BuildMI(MF, DL, get(PPC::SPILL_CR))
489                                       .addReg(SrcReg,
490                                               getKillRegState(isKill)),
491                                       FrameIdx));
492    return true;
493  } else if (PPC::CRBITRCRegClass.hasSubClassEq(RC)) {
494    // FIXME: We use CRi here because there is no mtcrf on a bit. Since the
495    // backend currently only uses CR1EQ as an individual bit, this should
496    // not cause any bug. If we need other uses of CR bits, the following
497    // code may be invalid.
498    unsigned Reg = 0;
499    if (SrcReg == PPC::CR0LT || SrcReg == PPC::CR0GT ||
500        SrcReg == PPC::CR0EQ || SrcReg == PPC::CR0UN)
501      Reg = PPC::CR0;
502    else if (SrcReg == PPC::CR1LT || SrcReg == PPC::CR1GT ||
503             SrcReg == PPC::CR1EQ || SrcReg == PPC::CR1UN)
504      Reg = PPC::CR1;
505    else if (SrcReg == PPC::CR2LT || SrcReg == PPC::CR2GT ||
506             SrcReg == PPC::CR2EQ || SrcReg == PPC::CR2UN)
507      Reg = PPC::CR2;
508    else if (SrcReg == PPC::CR3LT || SrcReg == PPC::CR3GT ||
509             SrcReg == PPC::CR3EQ || SrcReg == PPC::CR3UN)
510      Reg = PPC::CR3;
511    else if (SrcReg == PPC::CR4LT || SrcReg == PPC::CR4GT ||
512             SrcReg == PPC::CR4EQ || SrcReg == PPC::CR4UN)
513      Reg = PPC::CR4;
514    else if (SrcReg == PPC::CR5LT || SrcReg == PPC::CR5GT ||
515             SrcReg == PPC::CR5EQ || SrcReg == PPC::CR5UN)
516      Reg = PPC::CR5;
517    else if (SrcReg == PPC::CR6LT || SrcReg == PPC::CR6GT ||
518             SrcReg == PPC::CR6EQ || SrcReg == PPC::CR6UN)
519      Reg = PPC::CR6;
520    else if (SrcReg == PPC::CR7LT || SrcReg == PPC::CR7GT ||
521             SrcReg == PPC::CR7EQ || SrcReg == PPC::CR7UN)
522      Reg = PPC::CR7;
523
524    return StoreRegToStackSlot(MF, Reg, isKill, FrameIdx,
525                               &PPC::CRRCRegClass, NewMIs, NonRI);
526
527  } else if (PPC::VRRCRegClass.hasSubClassEq(RC)) {
528    NewMIs.push_back(addFrameReference(BuildMI(MF, DL, get(PPC::STVX))
529                                       .addReg(SrcReg,
530                                               getKillRegState(isKill)),
531                                       FrameIdx));
532    NonRI = true;
533  } else if (PPC::VRSAVERCRegClass.hasSubClassEq(RC)) {
534    NewMIs.push_back(addFrameReference(BuildMI(MF, DL, get(PPC::SPILL_VRSAVE))
535                                       .addReg(SrcReg,
536                                               getKillRegState(isKill)),
537                                       FrameIdx));
538    NonRI = true;
539  } else {
540    llvm_unreachable("Unknown regclass!");
541  }
542
543  return false;
544}
545
546void
547PPCInstrInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
548                                  MachineBasicBlock::iterator MI,
549                                  unsigned SrcReg, bool isKill, int FrameIdx,
550                                  const TargetRegisterClass *RC,
551                                  const TargetRegisterInfo *TRI) const {
552  MachineFunction &MF = *MBB.getParent();
553  SmallVector<MachineInstr*, 4> NewMIs;
554
555  PPCFunctionInfo *FuncInfo = MF.getInfo<PPCFunctionInfo>();
556  FuncInfo->setHasSpills();
557
558  bool NonRI = false;
559  if (StoreRegToStackSlot(MF, SrcReg, isKill, FrameIdx, RC, NewMIs, NonRI))
560    FuncInfo->setSpillsCR();
561
562  if (NonRI)
563    FuncInfo->setHasNonRISpills();
564
565  for (unsigned i = 0, e = NewMIs.size(); i != e; ++i)
566    MBB.insert(MI, NewMIs[i]);
567
568  const MachineFrameInfo &MFI = *MF.getFrameInfo();
569  MachineMemOperand *MMO =
570    MF.getMachineMemOperand(MachinePointerInfo::getFixedStack(FrameIdx),
571                            MachineMemOperand::MOStore,
572                            MFI.getObjectSize(FrameIdx),
573                            MFI.getObjectAlignment(FrameIdx));
574  NewMIs.back()->addMemOperand(MF, MMO);
575}
576
577bool
578PPCInstrInfo::LoadRegFromStackSlot(MachineFunction &MF, DebugLoc DL,
579                                   unsigned DestReg, int FrameIdx,
580                                   const TargetRegisterClass *RC,
581                                   SmallVectorImpl<MachineInstr*> &NewMIs,
582                                   bool &NonRI) const{
583  if (PPC::GPRCRegClass.hasSubClassEq(RC)) {
584    if (DestReg != PPC::LR) {
585      NewMIs.push_back(addFrameReference(BuildMI(MF, DL, get(PPC::LWZ),
586                                                 DestReg), FrameIdx));
587    } else {
588      NewMIs.push_back(addFrameReference(BuildMI(MF, DL, get(PPC::LWZ),
589                                                 PPC::R11), FrameIdx));
590      NewMIs.push_back(BuildMI(MF, DL, get(PPC::MTLR)).addReg(PPC::R11));
591    }
592  } else if (PPC::G8RCRegClass.hasSubClassEq(RC)) {
593    if (DestReg != PPC::LR8) {
594      NewMIs.push_back(addFrameReference(BuildMI(MF, DL, get(PPC::LD), DestReg),
595                                         FrameIdx));
596    } else {
597      NewMIs.push_back(addFrameReference(BuildMI(MF, DL, get(PPC::LD),
598                                                 PPC::X11), FrameIdx));
599      NewMIs.push_back(BuildMI(MF, DL, get(PPC::MTLR8)).addReg(PPC::X11));
600    }
601  } else if (PPC::F8RCRegClass.hasSubClassEq(RC)) {
602    NewMIs.push_back(addFrameReference(BuildMI(MF, DL, get(PPC::LFD), DestReg),
603                                       FrameIdx));
604  } else if (PPC::F4RCRegClass.hasSubClassEq(RC)) {
605    NewMIs.push_back(addFrameReference(BuildMI(MF, DL, get(PPC::LFS), DestReg),
606                                       FrameIdx));
607  } else if (PPC::CRRCRegClass.hasSubClassEq(RC)) {
608    NewMIs.push_back(addFrameReference(BuildMI(MF, DL,
609                                               get(PPC::RESTORE_CR), DestReg),
610                                       FrameIdx));
611    return true;
612  } else if (PPC::CRBITRCRegClass.hasSubClassEq(RC)) {
613
614    unsigned Reg = 0;
615    if (DestReg == PPC::CR0LT || DestReg == PPC::CR0GT ||
616        DestReg == PPC::CR0EQ || DestReg == PPC::CR0UN)
617      Reg = PPC::CR0;
618    else if (DestReg == PPC::CR1LT || DestReg == PPC::CR1GT ||
619             DestReg == PPC::CR1EQ || DestReg == PPC::CR1UN)
620      Reg = PPC::CR1;
621    else if (DestReg == PPC::CR2LT || DestReg == PPC::CR2GT ||
622             DestReg == PPC::CR2EQ || DestReg == PPC::CR2UN)
623      Reg = PPC::CR2;
624    else if (DestReg == PPC::CR3LT || DestReg == PPC::CR3GT ||
625             DestReg == PPC::CR3EQ || DestReg == PPC::CR3UN)
626      Reg = PPC::CR3;
627    else if (DestReg == PPC::CR4LT || DestReg == PPC::CR4GT ||
628             DestReg == PPC::CR4EQ || DestReg == PPC::CR4UN)
629      Reg = PPC::CR4;
630    else if (DestReg == PPC::CR5LT || DestReg == PPC::CR5GT ||
631             DestReg == PPC::CR5EQ || DestReg == PPC::CR5UN)
632      Reg = PPC::CR5;
633    else if (DestReg == PPC::CR6LT || DestReg == PPC::CR6GT ||
634             DestReg == PPC::CR6EQ || DestReg == PPC::CR6UN)
635      Reg = PPC::CR6;
636    else if (DestReg == PPC::CR7LT || DestReg == PPC::CR7GT ||
637             DestReg == PPC::CR7EQ || DestReg == PPC::CR7UN)
638      Reg = PPC::CR7;
639
640    return LoadRegFromStackSlot(MF, DL, Reg, FrameIdx,
641                                &PPC::CRRCRegClass, NewMIs, NonRI);
642
643  } else if (PPC::VRRCRegClass.hasSubClassEq(RC)) {
644    NewMIs.push_back(addFrameReference(BuildMI(MF, DL, get(PPC::LVX), DestReg),
645                                       FrameIdx));
646    NonRI = true;
647  } else if (PPC::VRSAVERCRegClass.hasSubClassEq(RC)) {
648    NewMIs.push_back(addFrameReference(BuildMI(MF, DL,
649                                               get(PPC::RESTORE_VRSAVE),
650                                               DestReg),
651                                       FrameIdx));
652    NonRI = true;
653  } else {
654    llvm_unreachable("Unknown regclass!");
655  }
656
657  return false;
658}
659
660void
661PPCInstrInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
662                                   MachineBasicBlock::iterator MI,
663                                   unsigned DestReg, int FrameIdx,
664                                   const TargetRegisterClass *RC,
665                                   const TargetRegisterInfo *TRI) const {
666  MachineFunction &MF = *MBB.getParent();
667  SmallVector<MachineInstr*, 4> NewMIs;
668  DebugLoc DL;
669  if (MI != MBB.end()) DL = MI->getDebugLoc();
670
671  PPCFunctionInfo *FuncInfo = MF.getInfo<PPCFunctionInfo>();
672  FuncInfo->setHasSpills();
673
674  bool NonRI = false;
675  if (LoadRegFromStackSlot(MF, DL, DestReg, FrameIdx, RC, NewMIs, NonRI))
676    FuncInfo->setSpillsCR();
677
678  if (NonRI)
679    FuncInfo->setHasNonRISpills();
680
681  for (unsigned i = 0, e = NewMIs.size(); i != e; ++i)
682    MBB.insert(MI, NewMIs[i]);
683
684  const MachineFrameInfo &MFI = *MF.getFrameInfo();
685  MachineMemOperand *MMO =
686    MF.getMachineMemOperand(MachinePointerInfo::getFixedStack(FrameIdx),
687                            MachineMemOperand::MOLoad,
688                            MFI.getObjectSize(FrameIdx),
689                            MFI.getObjectAlignment(FrameIdx));
690  NewMIs.back()->addMemOperand(MF, MMO);
691}
692
693MachineInstr*
694PPCInstrInfo::emitFrameIndexDebugValue(MachineFunction &MF,
695                                       int FrameIx, uint64_t Offset,
696                                       const MDNode *MDPtr,
697                                       DebugLoc DL) const {
698  MachineInstrBuilder MIB = BuildMI(MF, DL, get(PPC::DBG_VALUE));
699  addFrameReference(MIB, FrameIx, 0, false).addImm(Offset).addMetadata(MDPtr);
700  return &*MIB;
701}
702
703bool PPCInstrInfo::
704ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const {
705  assert(Cond.size() == 2 && "Invalid PPC branch opcode!");
706  if (Cond[1].getReg() == PPC::CTR8 || Cond[1].getReg() == PPC::CTR)
707    Cond[0].setImm(Cond[0].getImm() == 0 ? 1 : 0);
708  else
709    // Leave the CR# the same, but invert the condition.
710    Cond[0].setImm(PPC::InvertPredicate((PPC::Predicate)Cond[0].getImm()));
711  return false;
712}
713
714/// GetInstSize - Return the number of bytes of code the specified
715/// instruction may be.  This returns the maximum number of bytes.
716///
717unsigned PPCInstrInfo::GetInstSizeInBytes(const MachineInstr *MI) const {
718  switch (MI->getOpcode()) {
719  case PPC::INLINEASM: {       // Inline Asm: Variable size.
720    const MachineFunction *MF = MI->getParent()->getParent();
721    const char *AsmStr = MI->getOperand(0).getSymbolName();
722    return getInlineAsmLength(AsmStr, *MF->getTarget().getMCAsmInfo());
723  }
724  case PPC::PROLOG_LABEL:
725  case PPC::EH_LABEL:
726  case PPC::GC_LABEL:
727  case PPC::DBG_VALUE:
728    return 0;
729  case PPC::BL8_NOP_ELF:
730  case PPC::BLA8_NOP_ELF:
731    return 8;
732  default:
733    return 4; // PowerPC instructions are all 4 bytes
734  }
735}
736