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Fix a crasher when PerformShiftCombine receives a BUILD_VECTOR of all UNDEF. Probably could use better handling in DAG combine or getNode. Fixes PR11772.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148285 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Craig Topper 2012-01-17 04:44:50 +00:00
parent fdebc38523
commit 37c2677fbc
1 changed files with 5 additions and 0 deletions
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5
lib/Target/X86/X86ISelLowering.cpp
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@ -13430,6 +13430,11 @@ static SDValue PerformShiftCombine(SDNode* N, SelectionDAG &DAG,
BaseShAmt = Arg;
break;
}
// Handle the case where the build_vector is all undef
// FIXME: Should DAG allow this?
if (i == NumElts)
return SDValue();
for (; i != NumElts; ++i) {
SDValue Arg = ShAmtOp.getOperand(i);
if (Arg.getOpcode() == ISD::UNDEF) continue;