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[x86] reduce code duplication; NFC 

llvm-svn: 356836
This commit is contained in:
Sanjay Patel 2019-03-23 15:00:52 +00:00
parent f5e52738fe
commit 2e92846d36
1 changed files with 5 additions and 3 deletions
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8
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -23926,17 +23926,19 @@ static SDValue lowerAddSub(SDValue Op, SelectionDAG &DAG,
static SDValue LowerADDSAT_SUBSAT(SDValue Op, SelectionDAG &DAG) {
MVT VT = Op.getSimpleValueType();
SDValue X = Op.getOperand(0), Y = Op.getOperand(1);
if (VT.getScalarType() == MVT::i1) {
SDLoc dl(Op);
switch (Op.getOpcode()) {
default: llvm_unreachable("Expected saturated arithmetic opcode");
case ISD::UADDSAT:
case ISD::SADDSAT:
return DAG.getNode(ISD::OR, dl, VT, Op.getOperand(0), Op.getOperand(1));
// *addsat i1 X, Y --> X | Y
return DAG.getNode(ISD::OR, dl, VT, X, Y);
case ISD::USUBSAT:
case ISD::SSUBSAT:
return DAG.getNode(ISD::AND, dl, VT, Op.getOperand(0),
DAG.getNOT(dl, Op.getOperand(1), VT));
// *subsat i1 X, Y --> X & ~Y
return DAG.getNode(ISD::AND, dl, VT, X, DAG.getNOT(dl, Y, VT));
}
}