Commit b065902e authored by Simon Pilgrim's avatar Simon Pilgrim
Browse files

[X86] combineBT - use SimplifyDemandedBits instead of GetDemandedBits 

Another step towards removing SelectionDAG::GetDemandedBits entirely
parent f651c402

llvm/lib/Target/X86/X86ISelLowering.cpp

+2 −3
Original line number Diff line number Diff line
@@ -43175,14 +43175,13 @@ static SDValue combineAndnp(SDNode *N, SelectionDAG &DAG, 














static SDValue combineBT(SDNode *N, SelectionDAG &DAG,















                         TargetLowering::DAGCombinerInfo &DCI) {













  SDValue N0 = N->getOperand(0);















  SDValue N1 = N->getOperand(1);





























  // BT ignores high bits in the bit index operand.















  unsigned BitWidth = N1.getValueSizeInBits();















  APInt DemandedMask = APInt::getLowBitsSet(BitWidth, Log2_32(BitWidth));













  if (SDValue DemandedN1 = DAG.GetDemandedBits(N1, DemandedMask))













    return DAG.getNode(X86ISD::BT, SDLoc(N), MVT::i32, N0, DemandedN1);













  if (DAG.getTargetLoweringInfo().SimplifyDemandedBits(N1, DemandedMask, DCI))













    return SDValue(N, 0);





























  return SDValue();















}