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Fold (fpext (load x)) -> (extload x)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28130 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -2413,6 +2413,20 @@ SDOperand DAGCombiner::visitFP_EXTEND(SDNode *N) {
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// fold (fp_extend c1fp) -> c1fp
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if (N0CFP)
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return DAG.getNode(ISD::FP_EXTEND, VT, N0);
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// fold (fpext (load x)) -> (fpext (fpround (extload x)))
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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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SDOperand ExtLoad = DAG.getExtLoad(ISD::EXTLOAD, VT, N0.getOperand(0),
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N0.getOperand(1), N0.getOperand(2),
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N0.getValueType());
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CombineTo(N, ExtLoad);
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CombineTo(N0.Val, DAG.getNode(ISD::FP_ROUND, N0.getValueType(), ExtLoad),
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ExtLoad.getValue(1));
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return SDOperand(N, 0); // Return N so it doesn't get rechecked!
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}
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return SDOperand();
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}
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