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fold PHI nodes in SizeOffsetEvaluator whenever possible.

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Unfortunately this change requires the cache map to hold WeakVHs instead

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159667 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nuno Lopes
2012-07-03 17:13:25 +00:00
parent 44d5c06488
commit 0dff532fce
2 changed files with 20 additions and 6 deletions
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14
lib/Analysis/MemoryBuiltins.cpp
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@ -682,7 +682,19 @@ SizeOffsetEvalType ObjectSizeOffsetEvaluator::visitPHINode(PHINode &PHI) {
SizePHI->addIncoming(EdgeData.first, PHI.getIncomingBlock(i));
OffsetPHI->addIncoming(EdgeData.second, PHI.getIncomingBlock(i));
}
return std::make_pair(SizePHI, OffsetPHI);
Value *Size = SizePHI, *Offset = OffsetPHI, *Tmp;
if ((Tmp = SizePHI->hasConstantValue())) {
Size = Tmp;
SizePHI->replaceAllUsesWith(Size);
SizePHI->eraseFromParent();
}
if ((Tmp = OffsetPHI->hasConstantValue())) {
Offset = Tmp;
OffsetPHI->replaceAllUsesWith(Offset);
OffsetPHI->eraseFromParent();
}
return std::make_pair(Size, Offset);
}
SizeOffsetEvalType ObjectSizeOffsetEvaluator::visitSelectInst(SelectInst &I) {