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Added some debugging output to pre-alloc splitting.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84681 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Lang Hames 2009-10-20 21:25:13 +00:00
parent d0d3cbb362
commit 67f25669db
1 changed files with 54 additions and 35 deletions
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89
lib/CodeGen/PreAllocSplitting.cpp
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@ -93,6 +93,8 @@ namespace {
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesCFG();
AU.addRequired<LiveIndexes>();
AU.addPreserved<LiveIndexes>();
AU.addRequired<LiveIntervals>();
AU.addPreserved<LiveIntervals>();
AU.addRequired<LiveStacks>();
@ -399,7 +401,7 @@ PreAllocSplitting::UpdateSpillSlotInterval(VNInfo *ValNo, LiveIndex SpillIndex,
SmallPtrSet<MachineBasicBlock*, 4> Processed;
LiveIndex EndIdx = LIs->getMBBEndIdx(MBB);
LiveRange SLR(SpillIndex, LIs->getNextSlot(EndIdx), CurrSValNo);
LiveRange SLR(SpillIndex, EndIdx.getNextSlot(), CurrSValNo);
CurrSLI->addRange(SLR);
Processed.insert(MBB);
@ -428,7 +430,7 @@ PreAllocSplitting::UpdateSpillSlotInterval(VNInfo *ValNo, LiveIndex SpillIndex,
CurrSLI->addRange(SLR);
} else if (LR->end > EndIdx) {
// Live range extends beyond end of mbb, process successors.
LiveRange SLR(Idx, LIs->getNextIndex(EndIdx), CurrSValNo);
LiveRange SLR(Idx, EndIdx.getNextIndex(), CurrSValNo);
CurrSLI->addRange(SLR);
for (MachineBasicBlock::succ_iterator SI = MBB->succ_begin(),
SE = MBB->succ_end(); SI != SE; ++SI)
@ -492,11 +494,11 @@ PreAllocSplitting::PerformPHIConstruction(MachineBasicBlock::iterator UseI,
// Once we've found it, extend its VNInfo to our instruction.
LiveIndex DefIndex = LIs->getInstructionIndex(Walker);
DefIndex = LIs->getDefIndex(DefIndex);
DefIndex = DefIndex.getDefIndex();
LiveIndex EndIndex = LIs->getMBBEndIdx(MBB);
RetVNI = NewVNs[Walker];
LI->addRange(LiveRange(DefIndex, LIs->getNextSlot(EndIndex), RetVNI));
LI->addRange(LiveRange(DefIndex, EndIndex.getNextSlot(), RetVNI));
} else if (!ContainsDefs && ContainsUses) {
SmallPtrSet<MachineInstr*, 2>& BlockUses = Uses[MBB];
@ -529,11 +531,11 @@ PreAllocSplitting::PerformPHIConstruction(MachineBasicBlock::iterator UseI,
}
LiveIndex UseIndex = LIs->getInstructionIndex(Walker);
UseIndex = LIs->getUseIndex(UseIndex);
UseIndex = UseIndex.getUseIndex();
LiveIndex EndIndex;
if (IsIntraBlock) {
EndIndex = LIs->getInstructionIndex(UseI);
EndIndex = LIs->getUseIndex(EndIndex);
EndIndex = EndIndex.getUseIndex();
} else
EndIndex = LIs->getMBBEndIdx(MBB);
@ -542,7 +544,7 @@ PreAllocSplitting::PerformPHIConstruction(MachineBasicBlock::iterator UseI,
RetVNI = PerformPHIConstruction(Walker, MBB, LI, Visited, Defs, Uses,
NewVNs, LiveOut, Phis, false, true);
LI->addRange(LiveRange(UseIndex, LIs->getNextSlot(EndIndex), RetVNI));
LI->addRange(LiveRange(UseIndex, EndIndex.getNextSlot(), RetVNI));
// FIXME: Need to set kills properly for inter-block stuff.
if (RetVNI->isKill(UseIndex)) RetVNI->removeKill(UseIndex);
@ -589,12 +591,11 @@ PreAllocSplitting::PerformPHIConstruction(MachineBasicBlock::iterator UseI,
}
LiveIndex StartIndex = LIs->getInstructionIndex(Walker);
StartIndex = foundDef ? LIs->getDefIndex(StartIndex) :
LIs->getUseIndex(StartIndex);
StartIndex = foundDef ? StartIndex.getDefIndex() : StartIndex.getUseIndex();
LiveIndex EndIndex;
if (IsIntraBlock) {
EndIndex = LIs->getInstructionIndex(UseI);
EndIndex = LIs->getUseIndex(EndIndex);
EndIndex = EndIndex.getUseIndex();
} else
EndIndex = LIs->getMBBEndIdx(MBB);
@ -604,7 +605,7 @@ PreAllocSplitting::PerformPHIConstruction(MachineBasicBlock::iterator UseI,
RetVNI = PerformPHIConstruction(Walker, MBB, LI, Visited, Defs, Uses,
NewVNs, LiveOut, Phis, false, true);
LI->addRange(LiveRange(StartIndex, LIs->getNextSlot(EndIndex), RetVNI));
LI->addRange(LiveRange(StartIndex, EndIndex.getNextSlot(), RetVNI));
if (foundUse && RetVNI->isKill(StartIndex))
RetVNI->removeKill(StartIndex);
@ -694,10 +695,10 @@ PreAllocSplitting::PerformPHIConstructionFallBack(MachineBasicBlock::iterator Us
LiveIndex EndIndex;
if (IsIntraBlock) {
EndIndex = LIs->getInstructionIndex(UseI);
EndIndex = LIs->getUseIndex(EndIndex);
EndIndex = EndIndex.getUseIndex();
} else
EndIndex = LIs->getMBBEndIdx(MBB);
LI->addRange(LiveRange(StartIndex, LIs->getNextSlot(EndIndex), RetVNI));
LI->addRange(LiveRange(StartIndex, EndIndex.getNextSlot(), RetVNI));
if (IsIntraBlock)
RetVNI->addKill(EndIndex);
@ -734,7 +735,7 @@ void PreAllocSplitting::ReconstructLiveInterval(LiveInterval* LI) {
Defs[(*DI).getParent()].insert(&*DI);
LiveIndex DefIdx = LIs->getInstructionIndex(&*DI);
DefIdx = LIs->getDefIndex(DefIdx);
DefIdx = DefIdx.getDefIndex();
assert(DI->getOpcode() != TargetInstrInfo::PHI &&
"Following NewVN isPHIDef flag incorrect. Fix me!");
@ -770,12 +771,12 @@ void PreAllocSplitting::ReconstructLiveInterval(LiveInterval* LI) {
for (MachineRegisterInfo::def_iterator DI = MRI->def_begin(LI->reg),
DE = MRI->def_end(); DI != DE; ++DI) {
LiveIndex DefIdx = LIs->getInstructionIndex(&*DI);
DefIdx = LIs->getDefIndex(DefIdx);
DefIdx = DefIdx.getDefIndex();
if (LI->liveAt(DefIdx)) continue;
VNInfo* DeadVN = NewVNs[&*DI];
LI->addRange(LiveRange(DefIdx, LIs->getNextSlot(DefIdx), DeadVN));
LI->addRange(LiveRange(DefIdx, DefIdx.getNextSlot(), DeadVN));
DeadVN->addKill(DefIdx);
}
@ -785,7 +786,7 @@ void PreAllocSplitting::ReconstructLiveInterval(LiveInterval* LI) {
VNInfo* VNI = *VI;
for (unsigned i = 0, e = VNI->kills.size(); i != e; ++i) {
LiveIndex KillIdx = VNI->kills[i];
if (KillIdx.isPHIIndex())
if (KillIdx.isPHI())
continue;
MachineInstr *KillMI = LIs->getInstructionFromIndex(KillIdx);
if (KillMI) {
@ -826,14 +827,14 @@ void PreAllocSplitting::RenumberValno(VNInfo* VN) {
// Locate two-address redefinitions
for (VNInfo::KillSet::iterator KI = OldVN->kills.begin(),
KE = OldVN->kills.end(); KI != KE; ++KI) {
assert(!KI->isPHIIndex() &&
assert(!KI->isPHI() &&
"VN previously reported having no PHI kills.");
MachineInstr* MI = LIs->getInstructionFromIndex(*KI);
unsigned DefIdx = MI->findRegisterDefOperandIdx(CurrLI->reg);
if (DefIdx == ~0U) continue;
if (MI->isRegTiedToUseOperand(DefIdx)) {
VNInfo* NextVN =
CurrLI->findDefinedVNInfoForRegInt(LIs->getDefIndex(*KI));
CurrLI->findDefinedVNInfoForRegInt(KI->getDefIndex());
if (NextVN == OldVN) continue;
Stack.push_back(NextVN);
}
@ -867,8 +868,8 @@ void PreAllocSplitting::RenumberValno(VNInfo* VN) {
MachineOperand& MO = I.getOperand();
LiveIndex InstrIdx = LIs->getInstructionIndex(&*I);
if ((MO.isUse() && NewLI.liveAt(LIs->getUseIndex(InstrIdx))) ||
(MO.isDef() && NewLI.liveAt(LIs->getDefIndex(InstrIdx))))
if ((MO.isUse() && NewLI.liveAt(InstrIdx.getUseIndex())) ||
(MO.isDef() && NewLI.liveAt(InstrIdx.getDefIndex())))
OpsToChange.push_back(std::make_pair(&*I, I.getOperandNo()));
}
@ -912,7 +913,7 @@ bool PreAllocSplitting::Rematerialize(unsigned VReg, VNInfo* ValNo,
ReconstructLiveInterval(CurrLI);
LiveIndex RematIdx = LIs->getInstructionIndex(prior(RestorePt));
RematIdx = LIs->getDefIndex(RematIdx);
RematIdx = RematIdx.getDefIndex();
RenumberValno(CurrLI->findDefinedVNInfoForRegInt(RematIdx));
++NumSplits;
@ -1052,11 +1053,14 @@ MachineInstr* PreAllocSplitting::FoldRestore(unsigned vreg,
/// so it would not cross the barrier that's being processed. Shrink wrap
/// (minimize) the live interval to the last uses.
bool PreAllocSplitting::SplitRegLiveInterval(LiveInterval *LI) {
DEBUG(errs() << "Pre-alloc splitting " << LI->reg << " for " << *Barrier
<< " result: ");
CurrLI = LI;
// Find live range where current interval cross the barrier.
LiveInterval::iterator LR =
CurrLI->FindLiveRangeContaining(LIs->getUseIndex(BarrierIdx));
CurrLI->FindLiveRangeContaining(BarrierIdx.getUseIndex());
VNInfo *ValNo = LR->valno;
assert(!ValNo->isUnused() && "Val# is defined by a dead def?");
@ -1065,8 +1069,10 @@ bool PreAllocSplitting::SplitRegLiveInterval(LiveInterval *LI) {
? LIs->getInstructionFromIndex(ValNo->def) : NULL;
// If this would create a new join point, do not split.
if (DefMI && createsNewJoin(LR, DefMI->getParent(), Barrier->getParent()))
if (DefMI && createsNewJoin(LR, DefMI->getParent(), Barrier->getParent())) {
DEBUG(errs() << "FAILED (would create a new join point).\n");
return false;
}
// Find all references in the barrier mbb.
SmallPtrSet<MachineInstr*, 4> RefsInMBB;
@ -1081,13 +1087,17 @@ bool PreAllocSplitting::SplitRegLiveInterval(LiveInterval *LI) {
LiveIndex RestoreIndex;
MachineBasicBlock::iterator RestorePt =
findRestorePoint(BarrierMBB, Barrier, LR->end, RefsInMBB, RestoreIndex);
if (RestorePt == BarrierMBB->end())
if (RestorePt == BarrierMBB->end()) {
DEBUG(errs() << "FAILED (could not find a suitable restore point).\n");
return false;
}
if (DefMI && LIs->isReMaterializable(*LI, ValNo, DefMI))
if (Rematerialize(LI->reg, ValNo, DefMI, RestorePt,
RestoreIndex, RefsInMBB))
return true;
RestoreIndex, RefsInMBB)) {
DEBUG(errs() << "success (remat).\n");
return true;
}
// Add a spill either before the barrier or after the definition.
MachineBasicBlock *DefMBB = DefMI ? DefMI->getParent() : NULL;
@ -1103,8 +1113,10 @@ bool PreAllocSplitting::SplitRegLiveInterval(LiveInterval *LI) {
} else {
MachineBasicBlock::iterator SpillPt =
findSpillPoint(BarrierMBB, Barrier, NULL, RefsInMBB, SpillIndex);
if (SpillPt == BarrierMBB->begin())
if (SpillPt == BarrierMBB->begin()) {
DEBUG(errs() << "FAILED (could not find a suitable spill point).\n");
return false; // No gap to insert spill.
}
// Add spill.
SS = CreateSpillStackSlot(CurrLI->reg, RC);
@ -1116,8 +1128,10 @@ bool PreAllocSplitting::SplitRegLiveInterval(LiveInterval *LI) {
RestoreIndex, SpillIndex, SS)) {
// If it's already split, just restore the value. There is no need to spill
// the def again.
if (!DefMI)
if (!DefMI) {
DEBUG(errs() << "FAILED (def is dead).\n");
return false; // Def is dead. Do nothing.
}
if ((SpillMI = FoldSpill(LI->reg, RC, DefMI, Barrier,
BarrierMBB, SS, RefsInMBB))) {
@ -1129,12 +1143,16 @@ bool PreAllocSplitting::SplitRegLiveInterval(LiveInterval *LI) {
// Add spill after the def and the last use before the barrier.
SpillPt = findSpillPoint(BarrierMBB, Barrier, DefMI,
RefsInMBB, SpillIndex);
if (SpillPt == DefMBB->begin())
if (SpillPt == DefMBB->begin()) {
DEBUG(errs() << "FAILED (could not find a suitable spill point).\n");
return false; // No gap to insert spill.
}
} else {
SpillPt = findNextEmptySlot(DefMBB, DefMI, SpillIndex);
if (SpillPt == DefMBB->end())
if (SpillPt == DefMBB->end()) {
DEBUG(errs() << "FAILED (could not find a suitable spill point).\n");
return false; // No gap to insert spill.
}
}
// Add spill.
SS = CreateSpillStackSlot(CurrLI->reg, RC);
@ -1162,18 +1180,19 @@ bool PreAllocSplitting::SplitRegLiveInterval(LiveInterval *LI) {
}
// Update spill stack slot live interval.
UpdateSpillSlotInterval(ValNo, LIs->getNextSlot(LIs->getUseIndex(SpillIndex)),
LIs->getDefIndex(RestoreIndex));
UpdateSpillSlotInterval(ValNo, SpillIndex.getUseIndex().getNextSlot(),
RestoreIndex.getDefIndex());
ReconstructLiveInterval(CurrLI);
if (!FoldedRestore) {
LiveIndex RestoreIdx = LIs->getInstructionIndex(prior(RestorePt));
RestoreIdx = LIs->getDefIndex(RestoreIdx);
RestoreIdx = RestoreIdx.getDefIndex();
RenumberValno(CurrLI->findDefinedVNInfoForRegInt(RestoreIdx));
}
++NumSplits;
DEBUG(errs() << "success.\n");
return true;
}
@ -1255,7 +1274,7 @@ bool PreAllocSplitting::removeDeadSpills(SmallPtrSet<LiveInterval*, 8>& split) {
for (MachineRegisterInfo::use_iterator UI = MRI->use_begin((*LI)->reg),
UE = MRI->use_end(); UI != UE; ++UI) {
LiveIndex index = LIs->getInstructionIndex(&*UI);
index = LIs->getUseIndex(index);
index = index.getUseIndex();
const LiveRange* LR = (*LI)->getLiveRangeContaining(index);
VNUseCount[LR->valno].insert(&*UI);