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Changed slot index ranges for MachineBasicBlocks to be exclusive of endpoint.

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This fixes an in-place update bug where code inserted at the end of basic blocks may not be covered by existing intervals which were live across the entire block. It is also consistent with the way ranges are specified for live intervals.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91859 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Lang Hames 2009-12-22 00:11:50 +00:00
parent 87710f04e5
commit 74ab5eeffb
7 changed files with 29 additions and 34 deletions
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2
include/llvm/CodeGen/SlotIndexes.h
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@ -579,7 +579,7 @@ namespace llvm {
(I == idx2MBBMap.end() && idx2MBBMap.size()>0)) ? (I-1): I;
assert(J != idx2MBBMap.end() && J->first <= index &&
index <= getMBBEndIdx(J->second) &&
index < getMBBEndIdx(J->second) &&
"index does not correspond to an MBB");
return J->second;
}

2
lib/CodeGen/CalcSpillWeights.cpp
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@ -95,7 +95,7 @@ bool CalculateSpillWeights::runOnMachineFunction(MachineFunction &fn) {
SlotIndex defIdx = lis->getInstructionIndex(mi).getDefIndex();
const LiveRange *dlr =
lis->getInterval(reg).getLiveRangeContaining(defIdx);
if (dlr->end > mbbEnd)
if (dlr->end >= mbbEnd)
weight *= 3.0F;
}
regInt.weight += weight;

15
lib/CodeGen/LiveIntervalAnalysis.cpp
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@ -324,8 +324,7 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock *mbb,
// of the defining block, potentially live across some blocks, then is
// live into some number of blocks, but gets killed. Start by adding a
// range that goes from this definition to the end of the defining block.
LiveRange NewLR(defIndex, getMBBEndIdx(mbb).getNextIndex().getLoadIndex(),
ValNo);
LiveRange NewLR(defIndex, getMBBEndIdx(mbb), ValNo);
DEBUG(errs() << " +" << NewLR);
interval.addRange(NewLR);
@ -334,10 +333,8 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock *mbb,
// live interval.
for (SparseBitVector<>::iterator I = vi.AliveBlocks.begin(),
E = vi.AliveBlocks.end(); I != E; ++I) {
LiveRange LR(
getMBBStartIdx(mf_->getBlockNumbered(*I)),
getMBBEndIdx(mf_->getBlockNumbered(*I)).getNextIndex().getLoadIndex(),
ValNo);
MachineBasicBlock *aliveBlock = mf_->getBlockNumbered(*I);
LiveRange LR(getMBBStartIdx(aliveBlock), getMBBEndIdx(aliveBlock), ValNo);
interval.addRange(LR);
DEBUG(errs() << " +" << LR);
}
@ -467,7 +464,7 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock *mbb,
CopyMI = mi;
ValNo = interval.getNextValue(defIndex, CopyMI, true, VNInfoAllocator);
SlotIndex killIndex = getMBBEndIdx(mbb).getNextIndex().getLoadIndex();
SlotIndex killIndex = getMBBEndIdx(mbb);
LiveRange LR(defIndex, killIndex, ValNo);
interval.addRange(LR);
ValNo->addKill(indexes_->getTerminatorGap(mbb));
@ -1247,7 +1244,7 @@ bool LiveIntervals::anyKillInMBBAfterIdx(const LiveInterval &li,
continue;
SlotIndex KillIdx = VNI->kills[j];
if (KillIdx > Idx && KillIdx < End)
if (KillIdx > Idx && KillIdx <= End)
return true;
}
return false;
@ -2085,7 +2082,7 @@ LiveRange LiveIntervals::addLiveRangeToEndOfBlock(unsigned reg,
VN->kills.push_back(indexes_->getTerminatorGap(startInst->getParent()));
LiveRange LR(
SlotIndex(getInstructionIndex(startInst).getDefIndex()),
getMBBEndIdx(startInst->getParent()).getNextIndex().getBaseIndex(), VN);
getMBBEndIdx(startInst->getParent()), VN);
Interval.addRange(LR);
return LR;

21
lib/CodeGen/PreAllocSplitting.cpp
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@ -378,7 +378,7 @@ PreAllocSplitting::UpdateSpillSlotInterval(VNInfo *ValNo, SlotIndex SpillIndex,
SmallPtrSet<MachineBasicBlock*, 4> Processed;
SlotIndex EndIdx = LIs->getMBBEndIdx(MBB);
LiveRange SLR(SpillIndex, EndIdx.getNextSlot(), CurrSValNo);
LiveRange SLR(SpillIndex, EndIdx, CurrSValNo);
CurrSLI->addRange(SLR);
Processed.insert(MBB);
@ -475,7 +475,7 @@ PreAllocSplitting::PerformPHIConstruction(MachineBasicBlock::iterator UseI,
SlotIndex EndIndex = LIs->getMBBEndIdx(MBB);
RetVNI = NewVNs[Walker];
LI->addRange(LiveRange(DefIndex, EndIndex.getNextSlot(), RetVNI));
LI->addRange(LiveRange(DefIndex, EndIndex, RetVNI));
} else if (!ContainsDefs && ContainsUses) {
SmallPtrSet<MachineInstr*, 2>& BlockUses = Uses[MBB];
@ -511,8 +511,7 @@ PreAllocSplitting::PerformPHIConstruction(MachineBasicBlock::iterator UseI,
UseIndex = UseIndex.getUseIndex();
SlotIndex EndIndex;
if (IsIntraBlock) {
EndIndex = LIs->getInstructionIndex(UseI);
EndIndex = EndIndex.getUseIndex();
EndIndex = LIs->getInstructionIndex(UseI).getDefIndex();
} else
EndIndex = LIs->getMBBEndIdx(MBB);
@ -521,7 +520,7 @@ PreAllocSplitting::PerformPHIConstruction(MachineBasicBlock::iterator UseI,
RetVNI = PerformPHIConstruction(Walker, MBB, LI, Visited, Defs, Uses,
NewVNs, LiveOut, Phis, false, true);
LI->addRange(LiveRange(UseIndex, EndIndex.getNextSlot(), RetVNI));
LI->addRange(LiveRange(UseIndex, EndIndex, RetVNI));
// FIXME: Need to set kills properly for inter-block stuff.
if (RetVNI->isKill(UseIndex)) RetVNI->removeKill(UseIndex);
@ -571,8 +570,7 @@ PreAllocSplitting::PerformPHIConstruction(MachineBasicBlock::iterator UseI,
StartIndex = foundDef ? StartIndex.getDefIndex() : StartIndex.getUseIndex();
SlotIndex EndIndex;
if (IsIntraBlock) {
EndIndex = LIs->getInstructionIndex(UseI);
EndIndex = EndIndex.getUseIndex();
EndIndex = LIs->getInstructionIndex(UseI).getDefIndex();
} else
EndIndex = LIs->getMBBEndIdx(MBB);
@ -582,7 +580,7 @@ PreAllocSplitting::PerformPHIConstruction(MachineBasicBlock::iterator UseI,
RetVNI = PerformPHIConstruction(Walker, MBB, LI, Visited, Defs, Uses,
NewVNs, LiveOut, Phis, false, true);
LI->addRange(LiveRange(StartIndex, EndIndex.getNextSlot(), RetVNI));
LI->addRange(LiveRange(StartIndex, EndIndex, RetVNI));
if (foundUse && RetVNI->isKill(StartIndex))
RetVNI->removeKill(StartIndex);
@ -663,7 +661,7 @@ PreAllocSplitting::PerformPHIConstructionFallBack(MachineBasicBlock::iterator Us
for (DenseMap<MachineBasicBlock*, VNInfo*>::iterator I =
IncomingVNs.begin(), E = IncomingVNs.end(); I != E; ++I) {
I->second->setHasPHIKill(true);
SlotIndex KillIndex = LIs->getMBBEndIdx(I->first);
SlotIndex KillIndex(LIs->getMBBEndIdx(I->first), true);
if (!I->second->isKill(KillIndex))
I->second->addKill(KillIndex);
}
@ -671,11 +669,10 @@ PreAllocSplitting::PerformPHIConstructionFallBack(MachineBasicBlock::iterator Us
SlotIndex EndIndex;
if (IsIntraBlock) {
EndIndex = LIs->getInstructionIndex(UseI);
EndIndex = EndIndex.getUseIndex();
EndIndex = LIs->getInstructionIndex(UseI).getDefIndex();
} else
EndIndex = LIs->getMBBEndIdx(MBB);
LI->addRange(LiveRange(StartIndex, EndIndex.getNextSlot(), RetVNI));
LI->addRange(LiveRange(StartIndex, EndIndex, RetVNI));
if (IsIntraBlock)
RetVNI->addKill(EndIndex);

4
lib/CodeGen/SimpleRegisterCoalescing.cpp
View File

@ -1065,7 +1065,7 @@ SimpleRegisterCoalescing::isWinToJoinVRWithSrcPhysReg(MachineInstr *CopyMI,
if (SuccMBB == CopyMBB)
continue;
if (DstInt.overlaps(li_->getMBBStartIdx(SuccMBB),
li_->getMBBEndIdx(SuccMBB).getNextIndex().getBaseIndex()))
li_->getMBBEndIdx(SuccMBB)))
return false;
}
}
@ -1121,7 +1121,7 @@ SimpleRegisterCoalescing::isWinToJoinVRWithDstPhysReg(MachineInstr *CopyMI,
if (PredMBB == SMBB)
continue;
if (SrcInt.overlaps(li_->getMBBStartIdx(PredMBB),
li_->getMBBEndIdx(PredMBB).getNextIndex().getBaseIndex()))
li_->getMBBEndIdx(PredMBB)))
return false;
}
}

11
lib/CodeGen/SlotIndexes.cpp
View File

@ -92,13 +92,14 @@ bool SlotIndexes::runOnMachineFunction(MachineFunction &fn) {
functionSize = 0;
unsigned index = 0;
push_back(createEntry(0, index));
// Iterate over the the function.
for (MachineFunction::iterator mbbItr = mf->begin(), mbbEnd = mf->end();
mbbItr != mbbEnd; ++mbbItr) {
MachineBasicBlock *mbb = &*mbbItr;
// Insert an index for the MBB start.
push_back(createEntry(0, index));
SlotIndex blockStartIndex(back(), SlotIndex::LOAD);
index += SlotIndex::NUM;
@ -137,16 +138,16 @@ bool SlotIndexes::runOnMachineFunction(MachineFunction &fn) {
index += SlotIndex::NUM;
}
SlotIndex blockEndIndex(back(), SlotIndex::STORE);
// One blank instruction at the end.
push_back(createEntry(0, index));
SlotIndex blockEndIndex(back(), SlotIndex::LOAD);
mbb2IdxMap.insert(
std::make_pair(mbb, std::make_pair(blockStartIndex, blockEndIndex)));
idx2MBBMap.push_back(IdxMBBPair(blockStartIndex, mbb));
}
// One blank instruction at the end.
push_back(createEntry(0, index));
// Sort the Idx2MBBMap
std::sort(idx2MBBMap.begin(), idx2MBBMap.end(), Idx2MBBCompare());

8
lib/CodeGen/Spiller.cpp
View File

@ -486,10 +486,10 @@ private:
SlotIndex newKillRangeEnd = oldKillRange->end;
oldKillRange->end = copyIdx.getDefIndex();
if (newKillRangeEnd != lis->getMBBEndIdx(killMBB).getNextSlot()) {
assert(newKillRangeEnd > lis->getMBBEndIdx(killMBB).getNextSlot() &&
if (newKillRangeEnd != lis->getMBBEndIdx(killMBB)) {
assert(newKillRangeEnd > lis->getMBBEndIdx(killMBB) &&
"PHI kill range doesn't reach kill-block end. Not sane.");
newLI->addRange(LiveRange(lis->getMBBEndIdx(killMBB).getNextSlot(),
newLI->addRange(LiveRange(lis->getMBBEndIdx(killMBB),
newKillRangeEnd, newVNI));
}
@ -500,7 +500,7 @@ private:
newKillVNI->addKill(lis->getMBBTerminatorGap(killMBB));
newKillVNI->setHasPHIKill(true);
li->addRange(LiveRange(copyIdx.getDefIndex(),
lis->getMBBEndIdx(killMBB).getNextSlot(),
lis->getMBBEndIdx(killMBB),
newKillVNI));
}