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authorDan Gohman <gohman@apple.com>2012-09-28 21:58:29 +0000
committerDan Gohman <gohman@apple.com>2012-09-28 21:58:29 +0000
commitb22c7dc707cf3770ff3b5e5f11f11fd0aaa06d9b (patch)
tree229206e36c039731daa063a9a194205dc31f904b /lib/CodeGen/CGExprAgg.cpp
parent72ab27732ea7a42d756a1e79727f86fbe391b42b (diff)
Add basic support for adding !tbaa.struct metadata on llvm.memcpy calls for
struct assignment. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@164853 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/CGExprAgg.cpp')
-rw-r--r--lib/CodeGen/CGExprAgg.cpp8
1 files changed, 7 insertions, 1 deletions
diff --git a/lib/CodeGen/CGExprAgg.cpp b/lib/CodeGen/CGExprAgg.cpp
index 48b21d2f85..c9ffc19a8b 100644
--- a/lib/CodeGen/CGExprAgg.cpp
+++ b/lib/CodeGen/CGExprAgg.cpp
@@ -1362,11 +1362,17 @@ void CodeGenFunction::EmitAggregateCopy(llvm::Value *DestPtr,
}
}
}
+
+ // Determine the metadata to describe the position of any padding in this
+ // memcpy, as well as the TBAA tags for the members of the struct, in case
+ // the optimizer wishes to expand it in to scalar memory operations.
+ llvm::MDNode *TBAAStructTag = CGM.getTBAAStructInfo(Ty);
Builder.CreateMemCpy(DestPtr, SrcPtr,
llvm::ConstantInt::get(IntPtrTy,
TypeInfo.first.getQuantity()),
- alignment.getQuantity(), isVolatile);
+ alignment.getQuantity(), isVolatile,
+ /*TBAATag=*/0, TBAAStructTag);
}
void CodeGenFunction::MaybeEmitStdInitializerListCleanup(llvm::Value *loc,