From: Michael Ilseman <milseman@apple.com>
Date: Wed, 12 Dec 2012 20:59:36 +0000 (+0000)
Subject: Restore the PHI optimization I accidently removed
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=94993e37c608d060ea2c60176f62f62291850293;p=oota-llvm.git

Restore the PHI optimization I accidently removed

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170024 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Transforms/InstCombine/InstCombineAddSub.cpp b/lib/Transforms/InstCombine/InstCombineAddSub.cpp
index c22249527b9..01a3c48635a 100644
--- a/lib/Transforms/InstCombine/InstCombineAddSub.cpp
+++ b/lib/Transforms/InstCombine/InstCombineAddSub.cpp
@@ -354,6 +354,10 @@ Instruction *InstCombiner::visitFAdd(BinaryOperator &I) {
   if (Value *V = SimplifyFAddInst(LHS, RHS, I.getFastMathFlags(), TD))
     return ReplaceInstUsesWith(I, V);
 
+  if (isa<PHINode>(LHS))
+    if (Instruction *NV = FoldOpIntoPhi(I))
+      return NV;
+
   // -A + B  -->  B - A
   // -A + -B  -->  -(A + B)
   if (Value *LHSV = dyn_castFNegVal(LHS))