diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Target/X86/X86ISelLowering.cpp | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp index 7e35fd24a0..213e880d96 100644 --- a/lib/Target/X86/X86ISelLowering.cpp +++ b/lib/Target/X86/X86ISelLowering.cpp @@ -8543,11 +8543,19 @@ SDValue X86TargetLowering::LowerToBT(SDValue And, ISD::CondCode CC, } } else if (Op1.getOpcode() == ISD::Constant) { ConstantSDNode *AndRHS = cast<ConstantSDNode>(Op1); + uint64_t AndRHSVal = AndRHS->getZExtValue(); SDValue AndLHS = Op0; - if (AndRHS->getZExtValue() == 1 && AndLHS.getOpcode() == ISD::SRL) { + + if (AndRHSVal == 1 && AndLHS.getOpcode() == ISD::SRL) { LHS = AndLHS.getOperand(0); RHS = AndLHS.getOperand(1); } + + // Use BT if the immediate can't be encoded in a TEST instruction. + if (!isUInt<32>(AndRHSVal) && isPowerOf2_64(AndRHSVal)) { + LHS = AndLHS; + RHS = DAG.getConstant(Log2_64_Ceil(AndRHSVal), LHS.getValueType()); + } } if (LHS.getNode()) { |