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Fix a use-after-free in post-ra-scheduling.

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MI->addOperand invalidates references to it's operands, avoid touching
the operand after a new one was added.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83249 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2009-10-02 15:59:52 +00:00
parent e1b691f208
commit 8bff4af612
1 changed files with 3 additions and 1 deletions
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4
lib/CodeGen/PostRASchedulerList.cpp
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@ -884,6 +884,7 @@ bool SchedulePostRATDList::ToggleKillFlag(MachineInstr *MI,
// If any subreg of MO is live, then create an imp-def for that
// subreg and keep MO marked as killed.
MO.setIsKill(false);
bool AllDead = true;
const unsigned SuperReg = MO.getReg();
for (const unsigned *Subreg = TRI->getSubRegisters(SuperReg);
@ -898,7 +899,8 @@ bool SchedulePostRATDList::ToggleKillFlag(MachineInstr *MI,
}
}
MO.setIsKill(AllDead);
if(AllDead)
MO.setIsKill(true);
return false;
}