From 981f50919e20af957dc147ec429ef0cd397e49f6 Mon Sep 17 00:00:00 2001
From: Sanjay Patel <spatel@rotateright.com>
Date: Mon, 13 Aug 2018 20:14:27 +0000
Subject: [SimplifyLibCalls] don't drop fast-math-flags on trig reflection
 folds

llvm-svn: 339608
---
 llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp')

diff --git a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
index eda3f059e69..599d50b46cb 100644
--- a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
+++ b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
@@ -1124,7 +1124,9 @@ Value *LibCallSimplifier::optimizeCAbs(CallInst *CI, IRBuilder<> &B) {
 
 static Value *optimizeTrigReflections(CallInst *Call, LibFunc Func,
                                       IRBuilder<> &B) {
-  // FIXME: This drops FMF.
+  IRBuilder<>::FastMathFlagGuard Guard(B);
+  B.setFastMathFlags(Call->getFastMathFlags());
+  
   // TODO: Add tan() and other calls.
   // TODO: Can this be shared to also handle LLVM intrinsics?
   Value *X;
-- 
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