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Make memcpyopt TBAA-aware.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121944 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2010-12-16 02:51:19 +00:00
parent ad3ea3d85f
commit 387f28aff4
3 changed files with 37 additions and 16 deletions
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14
lib/Analysis/AliasAnalysis.cpp
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@@ -219,8 +219,11 @@ AliasAnalysis::getLocationForSource(const MemTransferInst *MTI) {
if (ConstantInt *C = dyn_cast<ConstantInt>(MTI->getLength()))
Size = C->getValue().getZExtValue();
// FIXME: Can memcpy/memmove have TBAA tags?
return Location(MTI->getRawSource(), Size, 0);
// memcpy/memmove can have TBAA tags. For memcpy, they apply
// to both the source and the destination.
MDNode *TBAATag = MTI->getMetadata(LLVMContext::MD_tbaa);
return Location(MTI->getRawSource(), Size, TBAATag);
}
AliasAnalysis::Location
@@ -228,9 +231,12 @@ AliasAnalysis::getLocationForDest(const MemIntrinsic *MTI) {
uint64_t Size = UnknownSize;
if (ConstantInt *C = dyn_cast<ConstantInt>(MTI->getLength()))
Size = C->getValue().getZExtValue();
// memcpy/memmove can have TBAA tags. For memcpy, they apply
// to both the source and the destination.
MDNode *TBAATag = MTI->getMetadata(LLVMContext::MD_tbaa);
// FIXME: Can memcpy/memmove have TBAA tags?
return Location(MTI->getRawDest(), Size, 0);
return Location(MTI->getRawDest(), Size, TBAATag);
}