Make memcpyopt TBAA-aware.
llvm-svn: 121944
diff --git a/llvm/lib/Analysis/AliasAnalysis.cpp b/llvm/lib/Analysis/AliasAnalysis.cpp
index 588d68d..7a94c43 100644
--- a/llvm/lib/Analysis/AliasAnalysis.cpp
+++ b/llvm/lib/Analysis/AliasAnalysis.cpp
@@ -219,8 +219,11 @@
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 @@
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);
}