commit bee05caa6b26cd945efce349dd53285ecae526fa
author Sanjay Patel <spatel@rotateright.com> Thu Dec 31 23:40:59 2015 +0000
committer Sanjay Patel <spatel@rotateright.com> Thu Dec 31 23:40:59 2015 +0000
tree b21b0d5a49ae9a66a6d23ce5ecfc8df642385aea
parent 74658dfaadcfe47e76ad03f7b27f8b09a80d0e71

[LibCallSimplifier] propagate FMF when shrinking binary calls

llvm-svn: 256682

llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp

diff --git a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
index 2eba5fe..bf15894 100644
--- a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
+++ b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
@@ -1033,6 +1033,10 @@
   if (V2 == nullptr)
     return nullptr;
 
+  // Propagate fast-math flags from the existing call to the new call.
+  IRBuilder<>::FastMathFlagGuard Guard(B);
+  B.SetFastMathFlags(CI->getFastMathFlags());
+
   // fmin((double)floatval1, (double)floatval2)
   //                      -> (double)fminf(floatval1, floatval2)
   // TODO: Handle intrinsics in the same way as in optimizeUnaryDoubleFP().