"There was a typo in my previous patch which leads to miscompilation of
strncat :(
strncat(foo, "bar", 99)
would be optimized to
memcpy(foo+strlen(foo), "bar", 100, 1)
instead of
memcpy(foo+strlen(foo), "bar", 4, 1)"
Patch by Benjamin Kramer!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68905 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/SimplifyLibCalls.cpp b/lib/Transforms/Scalar/SimplifyLibCalls.cpp
index 7e23c95..d53bc3f 100644
--- a/lib/Transforms/Scalar/SimplifyLibCalls.cpp
+++ b/lib/Transforms/Scalar/SimplifyLibCalls.cpp
@@ -582,7 +582,7 @@
// strncat(x, s, c) -> strcat(x, s)
// s is constant so the strcat can be optimized further
- EmitStrLenMemCpy(Src, Dst, Len, B);
+ EmitStrLenMemCpy(Src, Dst, SrcLen, B);
return Dst;
}
};