commit 0a921698b6d6f8a40df3893a72c7e6ced1c919a0
author Evan Cheng <evan.cheng@apple.com> Tue Feb 22 07:07:59 2011 +0000
committer Evan Cheng <evan.cheng@apple.com> Tue Feb 22 07:07:59 2011 +0000
tree 8ef082318999b31a2cb01a0c3bab181298f4c917
parent af05c69ba024b1838ae6f1071d6fd0f9fe33999f

Guard against de-referencing MBB.end().

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126192 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/ARM/Thumb2InstrInfo.cpp

diff --git a/lib/Target/ARM/Thumb2InstrInfo.cpp b/lib/Target/ARM/Thumb2InstrInfo.cpp
index 836c1ba..9b1073b 100644
--- a/lib/Target/ARM/Thumb2InstrInfo.cpp
+++ b/lib/Target/ARM/Thumb2InstrInfo.cpp
@@ -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;