[BuildLibCalls] Noalias annotation

Summary: I think this is better solution than annotating callsites in IC/SLC.

Reviewers: jdoerfert

Reviewed By: jdoerfert

Subscribers: MaskRay, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D66217

llvm-svn: 368875

1 files changed, 0 insertions, 9 deletions

diff --git a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
index cb1021dae33..ef4cc227222 100644
--- a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
+++ b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
@@ -460,9 +460,6 @@ Value *LibCallSimplifier::optimizeStrCpy(CallInst *CI, IRBuilder<> &B) {
   if (Dst == Src) // strcpy(x,x)  -> x
     return Src;
 
-  CI->addParamAttr(0, Attribute::NoAlias);
-  CI->addParamAttr(1, Attribute::NoAlias);
-
   // See if we can get the length of the input string.
   uint64_t Len = GetStringLength(Src);
   if (Len == 0)
@@ -505,9 +502,6 @@ Value *LibCallSimplifier::optimizeStrNCpy(CallInst *CI, IRBuilder<> &B) {
   Value *Src = CI->getArgOperand(1);
   Value *LenOp = CI->getArgOperand(2);
 
-  CI->addParamAttr(0, Attribute::NoAlias);
-  CI->addParamAttr(1, Attribute::NoAlias);
-
   // See if we can get the length of the input string.
   uint64_t SrcLen = GetStringLength(Src);
   if (SrcLen == 0)
@@ -989,9 +983,6 @@ Value *LibCallSimplifier::optimizeMemCpy(CallInst *CI, IRBuilder<> &B,
   if (ConstantInt *LenC = dyn_cast<ConstantInt>(Size))
     annotateDereferenceableBytes(CI, {0, 1}, LenC->getZExtValue());
 
-  CI->addParamAttr(0, Attribute::NoAlias);
-  CI->addParamAttr(1, Attribute::NoAlias);
-
   if (isIntrinsic)
     return nullptr;