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Add a missing check to avoid dereference null. No sensible test case possible. Sorry. rdar://11745134

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159236 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2012-06-26 22:54:59 +00:00
parent bbbe413846
commit d096479f31
1 changed files with 2 additions and 0 deletions
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lib/Target/ARM/ARMBaseInstrInfo.cpp
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@ -1802,6 +1802,8 @@ static bool isSuitableForMask(MachineInstr *&MI, unsigned SrcReg,
bool ARMBaseInstrInfo::
OptimizeCompareInstr(MachineInstr *CmpInstr, unsigned SrcReg, int CmpMask,
int CmpValue, const MachineRegisterInfo *MRI) const {
if (MRI->def_empty(SrcReg))
return false;
MachineRegisterInfo::def_iterator DI = MRI->def_begin(SrcReg);
if (llvm::next(DI) != MRI->def_end())