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Zero is cheaper than sign extend.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19675 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-01-18 21:57:59 +00:00
parent 477c931852
commit d5d5682512
1 changed files with 1 additions and 1 deletions
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lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -793,7 +793,7 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
case ISD::SIGN_EXTEND: case ISD::SIGN_EXTEND:
Result = PromoteOp(Node->getOperand(0)); Result = PromoteOp(Node->getOperand(0));
// NOTE: Any extend would work here... // NOTE: Any extend would work here...
Result = DAG.getNode(ISD::SIGN_EXTEND, Op.getValueType(), Result); Result = DAG.getNode(ISD::ZERO_EXTEND, Op.getValueType(), Result);
Result = DAG.getNode(ISD::SIGN_EXTEND_INREG, Result.getValueType(), Result = DAG.getNode(ISD::SIGN_EXTEND_INREG, Result.getValueType(),
Result, Node->getOperand(0).getValueType()); Result, Node->getOperand(0).getValueType());
break; break;