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Fix a miscompilation of:

Browse Source 
long long foo(long long X) {
  return (long long)(signed char)(int)X;
}

Instead of:

_foo:
        extsb r2, r4
        srawi r3, r4, 31
        mr r4, r2
        blr

we now produce:

_foo:
        extsb r4, r4
        srawi r3, r4, 31
        blr

This fixes a miscompilation in ConstantFolding.cpp.

llvm-svn: 30768
This commit is contained in:
Chris Lattner 2006-10-06 17:34:12 +00:00
parent d870b158b3
commit 0d39b3a4cf
1 changed files with 5 additions and 3 deletions
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8
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -4349,12 +4349,14 @@ void SelectionDAGLegalize::ExpandOp(SDOperand Op, SDOperand &Lo, SDOperand &Hi){
case ISD::SIGN_EXTEND_INREG:
ExpandOp(Node->getOperand(0), Lo, Hi);
// Sign extend the lo-part.
// sext_inreg the low part if needed.
Lo = DAG.getNode(ISD::SIGN_EXTEND_INREG, NVT, Lo, Node->getOperand(1));
// The high part gets the sign extension from the lo-part. This handles
// things like sextinreg V:i64 from i8.
Hi = DAG.getNode(ISD::SRA, NVT, Lo,
DAG.getConstant(MVT::getSizeInBits(NVT)-1,
TLI.getShiftAmountTy()));
// sext_inreg the low part if needed.
Lo = DAG.getNode(ISD::SIGN_EXTEND_INREG, NVT, Lo, Node->getOperand(1));
break;
case ISD::BSWAP: {