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Apply a patch from Jan Sjodin to fix a compiler abort on vector

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comparisons sign-extended to a different bitwidth than the
comparison operands.

llvm-svn: 102721
This commit is contained in:
Dan Gohman 2010-04-30 17:19:19 +00:00
parent 309dd836c0
commit e9ff394082
1 changed files with 24 additions and 9 deletions
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33
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -3538,21 +3538,36 @@ SDValue DAGCombiner::visitSIGN_EXTEND(SDNode *N) {
if (N0.getOpcode() == ISD::SETCC) {
// sext(setcc) -> sext_in_reg(vsetcc) for vectors.
if (VT.isVector() &&
// Only do this before legalize for now.
if (VT.isVector() && !LegalOperations) {
EVT N0VT = N0.getOperand(0).getValueType();
// We know that the # elements of the results is the same as the
// # elements of the compare (and the # elements of the compare result
// for that matter). Check to see that they are the same size. If so,
// we know that the element size of the sext'd result matches the
// element size of the compare operands.
VT.getSizeInBits() == N0.getOperand(0).getValueType().getSizeInBits() &&
// Only do this before legalize for now.
!LegalOperations) {
return DAG.getVSetCC(N->getDebugLoc(), VT, N0.getOperand(0),
N0.getOperand(1),
cast<CondCodeSDNode>(N0.getOperand(2))->get());
if (VT.getSizeInBits() == N0VT.getSizeInBits())
return DAG.getVSetCC(N->getDebugLoc(), VT, N0.getOperand(0),
N0.getOperand(1),
cast<CondCodeSDNode>(N0.getOperand(2))->get());
// If the desired elements are smaller or larger than the source
// elements we can use a matching integer vector type and then
// truncate/sign extend
else {
EVT MatchingElementType =
EVT::getIntegerVT(*DAG.getContext(),
N0VT.getScalarType().getSizeInBits());
EVT MatchingVectorType =
EVT::getVectorVT(*DAG.getContext(), MatchingElementType,
N0VT.getVectorNumElements());
SDValue VsetCC =
DAG.getVSetCC(N->getDebugLoc(), MatchingVectorType, N0.getOperand(0),
N0.getOperand(1),
cast<CondCodeSDNode>(N0.getOperand(2))->get());
return DAG.getSExtOrTrunc(VsetCC, N->getDebugLoc(), VT);
}
}
// sext(setcc x, y, cc) -> (select_cc x, y, -1, 0, cc)
unsigned ElementWidth = VT.getScalarType().getSizeInBits();
SDValue NegOne =