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Zero is cheaper than sign extend.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19675 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -793,7 +793,7 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
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case ISD::SIGN_EXTEND:
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Result = PromoteOp(Node->getOperand(0));
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// NOTE: Any extend would work here...
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Result = DAG.getNode(ISD::SIGN_EXTEND, Op.getValueType(), Result);
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Result = DAG.getNode(ISD::ZERO_EXTEND, Op.getValueType(), Result);
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Result = DAG.getNode(ISD::SIGN_EXTEND_INREG, Result.getValueType(),
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Result, Node->getOperand(0).getValueType());
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break;
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