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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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12
include/llvm/Analysis/MemoryBuiltins.h
View File

@ -22,6 +22,7 @@
#include "llvm/Support/DataTypes.h"
#include "llvm/Support/InstVisitor.h"
#include "llvm/Support/TargetFolder.h"
#include "llvm/Support/ValueHandle.h"
namespace llvm {
class CallInst;
@ -195,7 +196,8 @@ class ObjectSizeOffsetEvaluator
: public InstVisitor<ObjectSizeOffsetEvaluator, SizeOffsetEvalType> {
typedef IRBuilder<true, TargetFolder> BuilderTy;
typedef DenseMap<const Value*, SizeOffsetEvalType> CacheMapTy;
typedef std::pair<WeakVH, WeakVH> WeakEvalType;
typedef DenseMap<const Value*, WeakEvalType> CacheMapTy;
typedef SmallPtrSet<const Value*, 8> PtrSetTy;
const TargetData *TD;
@ -216,19 +218,19 @@ public:
ObjectSizeOffsetEvaluator(const TargetData *TD, LLVMContext &Context);
SizeOffsetEvalType compute(Value *V);
bool knownSize(SizeOffsetEvalType &SizeOffset) {
bool knownSize(SizeOffsetEvalType SizeOffset) {
return SizeOffset.first;
}
bool knownOffset(SizeOffsetEvalType &SizeOffset) {
bool knownOffset(SizeOffsetEvalType SizeOffset) {
return SizeOffset.second;
}
bool anyKnown(SizeOffsetEvalType &SizeOffset) {
bool anyKnown(SizeOffsetEvalType SizeOffset) {
return knownSize(SizeOffset) || knownOffset(SizeOffset);
}
bool bothKnown(SizeOffsetEvalType &SizeOffset) {
bool bothKnown(SizeOffsetEvalType SizeOffset) {
return knownSize(SizeOffset) && knownOffset(SizeOffset);
}

14
lib/Analysis/MemoryBuiltins.cpp
View File

@ -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) {