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Fold zext_inreg(zextload), likewise for sext's
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21204 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1101,6 +1101,12 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,SDOperand N1,
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return N1;
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}
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// If we are (zero|sign) extending a [zs]extload, return just the load.
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if ((N1.getOpcode() == ISD::ZEXTLOAD && Opcode == ISD::ZERO_EXTEND_INREG) ||
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(N1.getOpcode() == ISD::SEXTLOAD && Opcode == ISD::SIGN_EXTEND_INREG))
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if (cast<MVTSDNode>(N1)->getExtraValueType() <= EVT)
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return N1;
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// If we are extending the result of a setcc, and we already know the
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// contents of the top bits, eliminate the extension.
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if (N1.getOpcode() == ISD::SETCC)
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