[llvm] r291534 - [DAGCombiner] Remove code for optimizing select (xor Cond, 0), X, Y -> select Cond, X, Y. Just let combine on the xor itself take care of it.

[Craig Topper via llvm-commits]

Author: ctopper
Date: Mon Jan  9 22:12:19 2017
New Revision: 291534

URL: http://llvm.org/viewvc/llvm-project?rev=291534&view=rev
Log:
[DAGCombiner] Remove code for optimizing select (xor Cond, 0), X, Y -> select Cond, X, Y. Just let combine on the xor itself take care of it.

Modified:
    llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp

Modified: llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp?rev=291534&r1=291533&r2=291534&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp Mon Jan  9 22:12:19 2017
@@ -5470,7 +5470,6 @@ SDValue DAGCombiner::visitSELECT(SDNode
   }
 
   // select (xor Cond, 1), X, Y -> select Cond, Y, X
-  // select (xor Cond, 0), X, Y -> selext Cond, X, Y
   if (VT0 == MVT::i1) {
     if (N0->getOpcode() == ISD::XOR) {
       if (auto *C = dyn_cast<ConstantSDNode>(N0->getOperand(1))) {
@@ -5478,9 +5477,6 @@ SDValue DAGCombiner::visitSELECT(SDNode
         if (C->isOne())
           return DAG.getNode(ISD::SELECT, SDLoc(N), N1.getValueType(),
                              Cond0, N2, N1);
-        else
-          return DAG.getNode(ISD::SELECT, SDLoc(N), N1.getValueType(),
-                             Cond0, N1, N2);
       }
     }
   }