From 197a60a66612ab274a734066962a10126a11fb53 Mon Sep 17 00:00:00 2001 From: Cameron Zwarich Date: Thu, 21 Feb 2013 08:51:58 +0000 Subject: [PATCH] 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 --- lib/CodeGen/PHIElimination.cpp | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/lib/CodeGen/PHIElimination.cpp b/lib/CodeGen/PHIElimination.cpp index b84d9d33398..5584708eae3 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.