[llvm-commits] [llvm] r62195 - /llvm/trunk/lib/Target/X86/X86ISelLowering.cpp

[Dan Gohman]

Author: djg
Date: Tue Jan 13 17:25:30 2009
New Revision: 62195

URL: http://llvm.org/viewvc/llvm-project?rev=62195&view=rev
Log:
Don't use a BT instruction if the AND has multiple uses.

Modified:
    llvm/trunk/lib/Target/X86/X86ISelLowering.cpp

Modified: llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86ISelLowering.cpp?rev=62195&r1=62194&r2=62195&view=diff

==============================================================================
--- llvm/trunk/lib/Target/X86/X86ISelLowering.cpp (original)
+++ llvm/trunk/lib/Target/X86/X86ISelLowering.cpp Tue Jan 13 17:25:30 2009
@@ -5034,7 +5034,9 @@
   // Lower ((X >>u N) & 1) != 0 to BT.
   // Lower ((X >>s N) & 1) != 0 to BT.
   // FIXME: Is i386 or later or available only on some chips?
-  if (Op0.getOpcode() == ISD::AND && Op1.getOpcode() == ISD::Constant &&
+  if (Op0.getOpcode() == ISD::AND &&
+      Op0.hasOneUse() &&
+      Op1.getOpcode() == ISD::Constant &&
       Op0.getOperand(1).getOpcode() == ISD::Constant &&
       (CC == ISD::SETEQ || CC == ISD::SETNE)) {
     ConstantSDNode *AndRHS = cast<ConstantSDNode>(Op0.getOperand(1));