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Only transform (sext (truncate x)) -> (sextinreg x) if before legalize or

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if the target supports the resultant sextinreg


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24632 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-12-07 18:02:05 +00:00
parent e80242a948
commit cc2210b4fa
1 changed files with 3 additions and 1 deletions
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4
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -1547,7 +1547,9 @@ SDOperand DAGCombiner::visitSIGN_EXTEND(SDNode *N) {
if (N0.getOpcode() == ISD::SEXTLOAD && VT == N0.getValueType())
return N0;
// fold (sext (truncate x)) -> (sextinreg x) iff x size == sext size.
if (N0.getOpcode() == ISD::TRUNCATE && N0.getOperand(0).getValueType() == VT)
if (N0.getOpcode() == ISD::TRUNCATE && N0.getOperand(0).getValueType() == VT&&
(!AfterLegalize ||
TLI.isOperationLegal(ISD::SIGN_EXTEND_INREG, N0.getValueType())))
return DAG.getNode(ISD::SIGN_EXTEND_INREG, VT, N0.getOperand(0),
DAG.getValueType(N0.getValueType()));
// fold (sext (load x)) -> (sextload x)