Guard against de-referencing MBB.end().

llvm-svn: 126192
2011-02-22 07:07:59 +00:00 · 2011-02-22 07:07:59 +00:00 · 666cf56668
parent 2ce663031f
commit 666cf56668
1 changed files with 4 additions and 1 deletions
--- a/llvm/lib/Target/ARM/Thumb2InstrInfo.cpp
+++ b/llvm/lib/Target/ARM/Thumb2InstrInfo.cpp
@ -95,8 +95,11 @@ Thumb2InstrInfo::ReplaceTailWithBranchTo(MachineBasicBlock::iterator Tail,
 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;