[DAGCombiner] use isBitwiseNot to simplify code; NFC

llvm-svn: 335652

1 files changed, 3 insertions, 8 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 640f07b262c..e5a10951478 100644
--- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -6932,15 +6932,10 @@ SDValue DAGCombiner::visitSELECT(SDNode *N) {
     }
   }
 
-  // select (xor Cond, 1), X, Y -> select Cond, Y, X
   if (VT0 == MVT::i1) {
-    if (N0->getOpcode() == ISD::XOR) {
-      if (auto *C = dyn_cast<ConstantSDNode>(N0->getOperand(1))) {
-        SDValue Cond0 = N0->getOperand(0);
-        if (C->isOne())
-          return DAG.getNode(ISD::SELECT, DL, N1.getValueType(), Cond0, N2, N1);
-      }
-    }
+    // select (not Cond), N1, N2 -> select Cond, N2, N1
+    if (isBitwiseNot(N0))
+      return DAG.getNode(ISD::SELECT, DL, VT, N0->getOperand(0), N2, N1);
   }
 
   // fold selects based on a setcc into other things, such as min/max/abs