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Avoid dereferencing off the beginning of lists. 

llvm-svn: 144569
This commit is contained in:
Evan Cheng 2011-11-14 21:11:15 +00:00
parent 28ffb7e444
commit f2fc508d4d
1 changed files with 4 additions and 7 deletions
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11
llvm/lib/CodeGen/TwoAddressInstructionPass.cpp
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@ -999,10 +999,8 @@ TwoAddressInstructionPass::RescheduleMIBelowKill(MachineBasicBlock *MBB,
}
// Move debug info as well.
if (From != MBB->begin()) {
while (llvm::prior(From)->isDebugValue())
--From;
}
while (From != MBB->begin() && llvm::prior(From)->isDebugValue())
--From;
// Copies following MI may have been moved as well.
nmi = To;
@ -1146,9 +1144,8 @@ TwoAddressInstructionPass::RescheduleKillAboveMI(MachineBasicBlock *MBB,
// Move the old kill above MI, don't forget to move debug info as well.
MachineBasicBlock::iterator InsertPos = mi;
if (InsertPos != MBB->begin())
while (llvm::prior(InsertPos)->isDebugValue())
--InsertPos;
while (InsertPos != MBB->begin() && llvm::prior(InsertPos)->isDebugValue())
--InsertPos;
MachineBasicBlock::iterator From = KillMI;
MachineBasicBlock::iterator To = llvm::next(From);
while (llvm::prior(From)->isDebugValue())