Mark strto* as readonly when the endptr is null.

[oota-llvm.git] / lib / Transforms / Scalar / SimplifyLibCalls.cpp

diff --git a/lib/Transforms/Scalar/SimplifyLibCalls.cpp b/lib/Transforms/Scalar/SimplifyLibCalls.cpp
index fed239eae3690a53490ee45fdcc85296ff2a56e9..c199f301a99eefd229dcbdb8a5352dfb261672b4 100644 (file)
--- a/lib/Transforms/Scalar/SimplifyLibCalls.cpp
+++ b/lib/Transforms/Scalar/SimplifyLibCalls.cpp
@@ -733,8 +733,10 @@ struct VISIBILITY_HIDDEN StrToOpt : public LibCallOptimization {
       return 0;
 
     Value *EndPtr = CI->getOperand(2);
-    if (isa<ConstantPointerNull>(EndPtr))
+    if (isa<ConstantPointerNull>(EndPtr)) {
+      CI->setOnlyReadsMemory();
       CI->addAttribute(1, Attribute::NoCapture);
+    }
 
     return 0;
   }