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| author | Cameron Zwarich <zwarich@apple.com> | 2013-02-21 08:51:58 +0000 |
|---|---|---|
| committer | Cameron Zwarich <zwarich@apple.com> | 2013-02-21 08:51:58 +0000 |
| commit | 197a60a66612ab274a734066962a10126a11fb53 (patch) | |
| tree | 8f800619651d913fb38d4bb1922b99aefd7781ac /lib/CodeGen/PHIElimination.cpp | |
| parent | a566d63b61f2a29e89696abba1729ac53b9843e6 (diff) | |
Don't rely on the isDead() MachineOperand flag when updating LiveIntervals.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175732 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/PHIElimination.cpp')
| -rw-r--r-- | lib/CodeGen/PHIElimination.cpp | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/lib/CodeGen/PHIElimination.cpp b/lib/CodeGen/PHIElimination.cpp index b84d9d3339..5584708eae 100644 --- a/lib/CodeGen/PHIElimination.cpp +++ b/lib/CodeGen/PHIElimination.cpp @@ -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. |