[llvm-commits] [llvm] r159236 - /llvm/trunk/lib/Target/ARM/ARMBaseInstrInfo.cpp
Evan Cheng
evan.cheng at apple.com
Tue Jun 26 15:54:59 PDT 2012
Author: evancheng
Date: Tue Jun 26 17:54:59 2012
New Revision: 159236
URL: http://llvm.org/viewvc/llvm-project?rev=159236&view=rev
Log:
Add a missing check to avoid dereference null. No sensible test case possible. Sorry. rdar://11745134
Modified:
llvm/trunk/lib/Target/ARM/ARMBaseInstrInfo.cpp
Modified: llvm/trunk/lib/Target/ARM/ARMBaseInstrInfo.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/ARM/ARMBaseInstrInfo.cpp?rev=159236&r1=159235&r2=159236&view=diff
==============================================================================
--- llvm/trunk/lib/Target/ARM/ARMBaseInstrInfo.cpp (original)
+++ llvm/trunk/lib/Target/ARM/ARMBaseInstrInfo.cpp Tue Jun 26 17:54:59 2012
@@ -1802,6 +1802,8 @@
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())
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