fold (aext (and (trunc x), cst)) -> (and x, cst).
llvm-svn: 30561
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@ -1897,6 +1897,21 @@ SDOperand DAGCombiner::visitANY_EXTEND(SDNode *N) {
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return DAG.getNode(ISD::TRUNCATE, VT, TruncOp);
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return DAG.getNode(ISD::TRUNCATE, VT, TruncOp);
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return DAG.getNode(ISD::ANY_EXTEND, VT, TruncOp);
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return DAG.getNode(ISD::ANY_EXTEND, VT, TruncOp);
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}
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}
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// fold (aext (and (trunc x), cst)) -> (and x, cst).
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if (N0.getOpcode() == ISD::AND &&
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N0.getOperand(0).getOpcode() == ISD::TRUNCATE &&
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N0.getOperand(1).getOpcode() == ISD::Constant) {
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SDOperand X = N0.getOperand(0).getOperand(0);
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if (X.getValueType() < VT) {
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X = DAG.getNode(ISD::ANY_EXTEND, VT, X);
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} else if (X.getValueType() > VT) {
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X = DAG.getNode(ISD::TRUNCATE, VT, X);
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}
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uint64_t Mask = cast<ConstantSDNode>(N0.getOperand(1))->getValue();
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return DAG.getNode(ISD::AND, VT, X, DAG.getConstant(Mask, VT));
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}
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// fold (aext (load x)) -> (aext (truncate (extload x)))
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// fold (aext (load x)) -> (aext (truncate (extload x)))
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if (N0.getOpcode() == ISD::LOAD && N0.hasOneUse() &&
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if (N0.getOpcode() == ISD::LOAD && N0.hasOneUse() &&
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(!AfterLegalize||TLI.isOperationLegal(ISD::EXTLOAD, N0.getValueType()))) {
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(!AfterLegalize||TLI.isOperationLegal(ISD::EXTLOAD, N0.getValueType()))) {
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