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| author | Craig Topper <craig.topper@gmail.com> | 2012-01-17 04:44:50 +0000 |
|---|---|---|
| committer | Craig Topper <craig.topper@gmail.com> | 2012-01-17 04:44:50 +0000 |
| commit | 37c2677fbcff1187106c579abfbd498aac739c2a (patch) | |
| tree | 65225777b255e9522992789818b6b1d895e56215 | |
| parent | fdebc38523b397743973ff6a2d2e93b112dd96e5 (diff) | |
| download | external_llvm-37c2677fbcff1187106c579abfbd498aac739c2a.zip external_llvm-37c2677fbcff1187106c579abfbd498aac739c2a.tar.gz external_llvm-37c2677fbcff1187106c579abfbd498aac739c2a.tar.bz2 | |
Fix a crasher when PerformShiftCombine receives a BUILD_VECTOR of all UNDEF. Probably could use better handling in DAG combine or getNode. Fixes PR11772.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148285 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/Target/X86/X86ISelLowering.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp index b5198c8..a0fd431 100644 --- a/lib/Target/X86/X86ISelLowering.cpp +++ b/lib/Target/X86/X86ISelLowering.cpp @@ -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; |