commit aa23114cb46bc35c95c2c38a98e16b38c8d29670
author Sanjay Patel <spatel@rotateright.com> Thu Dec 31 21:52:31 2015 +0000
committer Sanjay Patel <spatel@rotateright.com> Thu Dec 31 21:52:31 2015 +0000
tree de410c704afcd6d5aa399b2de473776d2dadc63e
parent f6f32bcaa470ec6a45a0b57426c573388a47ddc7

[LibCallSimplifier] propagate FMF when shrinking unary calls

llvm-svn: 256679

llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp

diff --git a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
index ea49131..2eba5fe 100644
--- a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
+++ b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
@@ -994,6 +994,10 @@
   Value *V = valueHasFloatPrecision(CI->getArgOperand(0));
   if (V == nullptr)
     return nullptr;
+  
+  // Propagate fast-math flags from the existing call to the new call.
+  IRBuilder<>::FastMathFlagGuard Guard(B);
+  B.SetFastMathFlags(CI->getFastMathFlags());
 
   // floor((double)floatval) -> (double)floorf(floatval)
   if (Callee->isIntrinsic()) {