[llvm-commits] [llvm] r170024 - /llvm/trunk/lib/Transforms/InstCombine/InstCombineAddSub.cpp

[Michael Ilseman]

Author: milseman
Date: Wed Dec 12 14:59:36 2012
New Revision: 170024

URL: http://llvm.org/viewvc/llvm-project?rev=170024&view=rev
Log:
Restore the PHI optimization I accidently removed

Modified:
    llvm/trunk/lib/Transforms/InstCombine/InstCombineAddSub.cpp

Modified: llvm/trunk/lib/Transforms/InstCombine/InstCombineAddSub.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/InstCombine/InstCombineAddSub.cpp?rev=170024&r1=170023&r2=170024&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/InstCombine/InstCombineAddSub.cpp (original)
+++ llvm/trunk/lib/Transforms/InstCombine/InstCombineAddSub.cpp Wed Dec 12 14:59:36 2012
@@ -354,6 +354,10 @@
   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))