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Don't rely on the isDead() MachineOperand flag when updating LiveIntervals.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175732 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Cameron Zwarich 2013-02-21 08:51:58 +00:00
parent a566d63b61
commit 197a60a666
1 changed files with 3 additions and 1 deletions
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4
lib/CodeGen/PHIElimination.cpp
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@ -320,7 +320,9 @@ void PHIElimination::LowerPHINode(MachineBasicBlock &MBB,
}
LiveInterval &DestLI = LIS->getInterval(DestReg);
if (NewInstr->getOperand(0).isDead()) {
assert(DestLI.begin() != DestLI.end() &&
"PHIs should have nonempty LiveIntervals.");
if (DestLI.endIndex().isDead()) {
// A dead PHI's live range begins and ends at the start of the MBB, but
// the lowered copy, which will still be dead, needs to begin and end at
// the copy instruction.