[llvm-commits] [llvm] r126192 - /llvm/trunk/lib/Target/ARM/Thumb2InstrInfo.cpp

[Evan Cheng]

Author: evancheng
Date: Tue Feb 22 01:07:59 2011
New Revision: 126192

URL: http://llvm.org/viewvc/llvm-project?rev=126192&view=rev
Log:
Guard against de-referencing MBB.end().

Modified:
    llvm/trunk/lib/Target/ARM/Thumb2InstrInfo.cpp

Modified: llvm/trunk/lib/Target/ARM/Thumb2InstrInfo.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/ARM/Thumb2InstrInfo.cpp?rev=126192&r1=126191&r2=126192&view=diff
==============================================================================
--- llvm/trunk/lib/Target/ARM/Thumb2InstrInfo.cpp (original)
+++ llvm/trunk/lib/Target/ARM/Thumb2InstrInfo.cpp Tue Feb 22 01:07:59 2011
@@ -95,8 +95,11 @@
 bool
 Thumb2InstrInfo::isLegalToSplitMBBAt(MachineBasicBlock &MBB,
                                      MachineBasicBlock::iterator MBBI) const {
-  while (MBBI->isDebugValue())
+  while (MBBI->isDebugValue()) {
     ++MBBI;
+    if (MBBI == MBB.end())
+      return false;
+  }
 
   unsigned PredReg = 0;
   return llvm::getITInstrPredicate(MBBI, PredReg) == ARMCC::AL;