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Fold (zext (load x) to (zextload x).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24702 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1552,7 +1552,7 @@ SDOperand DAGCombiner::visitSIGN_EXTEND(SDNode *N) {
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TLI.isOperationLegal(ISD::SIGN_EXTEND_INREG, N0.getValueType())))
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return DAG.getNode(ISD::SIGN_EXTEND_INREG, VT, N0.getOperand(0),
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DAG.getValueType(N0.getValueType()));
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// fold (sext (load x)) -> (sextload x)
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// fold (sext (load x)) -> (sext (truncate (sextload x)))
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if (N0.getOpcode() == ISD::LOAD && N0.hasOneUse()) {
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SDOperand ExtLoad = DAG.getExtLoad(ISD::SEXTLOAD, VT, N0.getOperand(0),
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N0.getOperand(1), N0.getOperand(2),
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@ -1576,6 +1576,23 @@ SDOperand DAGCombiner::visitZERO_EXTEND(SDNode *N) {
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// fold (zext (zext x)) -> (zext x)
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if (N0.getOpcode() == ISD::ZERO_EXTEND)
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return DAG.getNode(ISD::ZERO_EXTEND, VT, N0.getOperand(0));
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// fold (zext (zextload x)) -> (zextload x)
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if (N0.getOpcode() == ISD::ZEXTLOAD && VT == N0.getValueType())
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return N0;
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// fold (zext (truncate x)) -> (zextinreg x) iff x size == zext size.
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if (N0.getOpcode() == ISD::TRUNCATE && N0.getOperand(0).getValueType() == VT&&
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!AfterLegalize)
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return DAG.getZeroExtendInReg(N0.getOperand(0), VT);
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// fold (zext (load x)) -> (zext (truncate (zextload x)))
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if (N0.getOpcode() == ISD::LOAD && N0.hasOneUse()) {
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SDOperand ExtLoad = DAG.getExtLoad(ISD::ZEXTLOAD, VT, N0.getOperand(0),
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N0.getOperand(1), N0.getOperand(2),
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N0.getValueType());
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WorkList.push_back(N);
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CombineTo(N0.Val, DAG.getNode(ISD::TRUNCATE, N0.getValueType(), ExtLoad),
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ExtLoad.getValue(1));
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return SDOperand();
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}
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return SDOperand();
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}
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