forked from OSchip/llvm-project
Add generic expansion of SUB when ADD and XOR
are legal. Based on a patch by Micah Villmow. llvm-svn: 71078
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9759f2e063
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@ -3268,8 +3268,7 @@ SDValue SelectionDAGLegalize::LegalizeOp(SDValue Op) {
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OpToUse = ISD::UMUL_LOHI;
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OpToUse = ISD::UMUL_LOHI;
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}
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}
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if (OpToUse) {
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if (OpToUse) {
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Result = SDValue(DAG.getNode(OpToUse, dl, VTs, Tmp1, Tmp2).getNode(),
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Result = DAG.getNode(OpToUse, dl, VTs, Tmp1, Tmp2);
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0);
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break;
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break;
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}
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}
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}
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}
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@ -3289,16 +3288,21 @@ SDValue SelectionDAGLegalize::LegalizeOp(SDValue Op) {
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}
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}
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if (Node->getOpcode() == ISD::SDIV &&
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if (Node->getOpcode() == ISD::SDIV &&
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TLI.isOperationLegalOrCustom(ISD::SDIVREM, VT)) {
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TLI.isOperationLegalOrCustom(ISD::SDIVREM, VT)) {
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Result = SDValue(DAG.getNode(ISD::SDIVREM, dl,
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Result = DAG.getNode(ISD::SDIVREM, dl, VTs, Tmp1, Tmp2);
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VTs, Tmp1, Tmp2).getNode(),
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0);
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break;
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break;
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}
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}
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if (Node->getOpcode() == ISD::UDIV &&
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if (Node->getOpcode() == ISD::UDIV &&
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TLI.isOperationLegalOrCustom(ISD::UDIVREM, VT)) {
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TLI.isOperationLegalOrCustom(ISD::UDIVREM, VT)) {
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Result = SDValue(DAG.getNode(ISD::UDIVREM, dl,
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Result = DAG.getNode(ISD::UDIVREM, dl, VTs, Tmp1, Tmp2);
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VTs, Tmp1, Tmp2).getNode(),
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break;
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0);
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}
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if (Node->getOpcode() == ISD::SUB &&
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TLI.isOperationLegalOrCustom(ISD::ADD, VT) &&
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TLI.isOperationLegalOrCustom(ISD::XOR, VT)) {
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Tmp2 = DAG.getNode(ISD::XOR, dl, VT, Tmp2,
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DAG.getConstant(APInt::getAllOnesValue(VT.getSizeInBits()), VT));
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Tmp2 = DAG.getNode(ISD::ADD, dl, VT, Tmp2, DAG.getConstant(1, VT));
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Result = DAG.getNode(ISD::ADD, dl, VT, Tmp1, Tmp2);
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break;
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break;
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}
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}
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