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Don't use a BT instruction if the AND has multiple uses.

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llvm-svn: 62195
This commit is contained in:
Dan Gohman 2009-01-13 23:25:30 +00:00
parent 8c835f6285
commit 9c2ee40c1c
1 changed files with 3 additions and 1 deletions
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4
lib/Target/X86/X86ISelLowering.cpp
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@ -5034,7 +5034,9 @@ SDValue X86TargetLowering::LowerSETCC(SDValue Op, SelectionDAG &DAG) {
// Lower ((X >>u N) & 1) != 0 to BT. // Lower ((X >>u N) & 1) != 0 to BT.
// Lower ((X >>s N) & 1) != 0 to BT. // Lower ((X >>s N) & 1) != 0 to BT.
// FIXME: Is i386 or later or available only on some chips? // 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 && Op0.getOperand(1).getOpcode() == ISD::Constant &&
(CC == ISD::SETEQ || CC == ISD::SETNE)) { (CC == ISD::SETEQ || CC == ISD::SETNE)) {
ConstantSDNode *AndRHS = cast<ConstantSDNode>(Op0.getOperand(1)); ConstantSDNode *AndRHS = cast<ConstantSDNode>(Op0.getOperand(1));