[llvm-commits] [llvm] r138130 - /llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp

[Benjamin Kramer]

Author: d0k
Date: Fri Aug 19 17:39:31 2011
New Revision: 138130

URL: http://llvm.org/viewvc/llvm-project?rev=138130&view=rev
Log:
Roll back the rest of r126557. It's a hack that will break in some obscure cases.

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=138130&r1=138129&r2=138130&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp Fri Aug 19 17:39:31 2011
@@ -1526,12 +1526,6 @@
   ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
   ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
 
-  // If both operands are null we know that carry out will always be false.
-  if (N0C && N0C->isNullValue() && N0 == N1)
-    DAG.ReplaceAllUsesOfValueWith(SDValue(N, 1), DAG.getNode(ISD::CARRY_FALSE,
-                                                             N->getDebugLoc(),
-                                                             MVT::Glue));
-
   // canonicalize constant to RHS
   if (N0C && !N1C)
     return DAG.getNode(ISD::ADDE, N->getDebugLoc(), N->getVTList(),