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Preserve TBAA tags when doing load PRE.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121921 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2010-12-15 23:53:55 +00:00
parent 3e333637f1
commit f4177aa019
2 changed files with 36 additions and 3 deletions
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11
lib/Transforms/Scalar/GVN.cpp
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@@ -22,6 +22,7 @@
#include "llvm/GlobalVariable.h"
#include "llvm/Function.h"
#include "llvm/IntrinsicInst.h"
#include "llvm/LLVMContext.h"
#include "llvm/Operator.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/ConstantFolding.h"
@@ -1659,9 +1660,13 @@ bool GVN::processNonLocalLoad(LoadInst *LI,
BasicBlock *UnavailablePred = I->first;
Value *LoadPtr = I->second;
Value *NewLoad = new LoadInst(LoadPtr, LI->getName()+".pre", false,
LI->getAlignment(),
UnavailablePred->getTerminator());
Instruction *NewLoad = new LoadInst(LoadPtr, LI->getName()+".pre", false,
LI->getAlignment(),
UnavailablePred->getTerminator());
// Transfer the old load's TBAA tag to the new load.
if (MDNode *Tag = LI->getMetadata(LLVMContext::MD_tbaa))
NewLoad->setMetadata(LLVMContext::MD_tbaa, Tag);
// Add the newly created load.
ValuesPerBlock.push_back(AvailableValueInBlock::get(UnavailablePred,