[llvm-commits] [llvm] r55886 - /llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp

[Bill Wendling]

Author: void
Date: Sun Sep  7 06:34:47 2008
New Revision: 55886

URL: http://llvm.org/viewvc/llvm-project?rev=55886&view=rev
Log:
Convert

    // fold (sub c1, c2) -> c1-c2

from a no-op into an actual transformation.

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=55886&r1=55885&r2=55886&view=diff

==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp Sun Sep  7 06:34:47 2008
@@ -1111,7 +1111,7 @@
     return DAG.getConstant(0, N->getValueType(0));
   // fold (sub c1, c2) -> c1-c2
   if (N0C && N1C)
-    return DAG.getNode(ISD::SUB, VT, N0, N1);
+    return DAG.getConstant(N0C->getAPIntValue() - N1C->getAPIntValue(), VT);
   // fold (sub x, c) -> (add x, -c)
   if (N1C)
     return DAG.getNode(ISD::ADD, VT, N0,