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make sure ScheduleDAGInstrs::EmitSchedule does not crash when the first instruction in Sequence is a Noop

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145677 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel 2011-12-02 04:58:07 +00:00
parent 64c34e2535
commit db809e0eb7
1 changed files with 5 additions and 5 deletions
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10
lib/CodeGen/ScheduleDAGInstrs.cpp
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@ -677,12 +677,12 @@ MachineBasicBlock *ScheduleDAGInstrs::EmitSchedule() {
else
// Null SUnit* is a noop.
EmitNoop();
}
// Update the Begin iterator, as the first instruction in the block
// may have been scheduled later.
if (!Sequence.empty())
Begin = Sequence[0]->getInstr();
// Update the Begin iterator, as the first instruction in the block
// may have been scheduled later.
if (i == 0)
Begin = prior(InsertPos);
}
// Reinsert any remaining debug_values.
for (std::vector<std::pair<MachineInstr *, MachineInstr *> >::iterator