Add a missing case in visitADD.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60137 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 762fcedc7fb18753b45eb2972d1dc5aa8ecfdcf7..6b35126a10ecbed26e3e7c7e6470fd45cdf5718b 100644 (file)
--- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -1010,6 +1010,9 @@ SDValue DAGCombiner::visitADD(SDNode *N) {
   // fold (A+(B-A)) -> B
   if (N1.getOpcode() == ISD::SUB && N0 == N1.getOperand(1))
     return N1.getOperand(0);
+  // fold ((B-A)+A) -> B
+  if (N0.getOpcode() == ISD::SUB && N1 == N0.getOperand(1))
+    return N0.getOperand(0);
 
   if (!VT.isVector() && SimplifyDemandedBits(SDValue(N, 0)))
     return SDValue(N, 0);