Author: lattner
Date: Fri Jan 25 19:05:42 2008
New Revision: 46383
URL: http://llvm.org/viewvc/llvm-project?rev=46383&view=rev
Log:
don't bother making x&-1 only to simplify it in dag combine. This commonly
occurs expanding i64 ops.
Modified:
llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
Modified: llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
URL:
http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAG.cpp?rev=46383&r1=46382&r2=46383&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAG.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAG.cpp Fri Jan 25 19:05:42
2008
@@ -1877,6 +1877,8 @@
// worth handling here.
if (N2C && N2C->getValue() == 0)
return N2;
+ if (N2C && N2C->isAllOnesValue()) // X & -1 -> X
+ return N1;
break;
case ISD::OR:
case ISD::XOR:
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