From eed97ef5d0254bc5e89ef434c4e4857922fbc3d1 Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Tue, 5 Aug 2008 07:10:38 +0000
Subject: Fix PR2568: Fix bug that cause redudant kill marker after its live
 interval has been extended due to coalescing.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54346 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/SimpleRegisterCoalescing.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'lib/CodeGen/SimpleRegisterCoalescing.cpp')

diff --git a/lib/CodeGen/SimpleRegisterCoalescing.cpp b/lib/CodeGen/SimpleRegisterCoalescing.cpp
index 68be3e1..9cb06ce 100644
--- a/lib/CodeGen/SimpleRegisterCoalescing.cpp
+++ b/lib/CodeGen/SimpleRegisterCoalescing.cpp
@@ -533,14 +533,16 @@ void SimpleRegisterCoalescing::RemoveUnnecessaryKills(unsigned Reg,
     MachineOperand &UseMO = UI.getOperand();
     if (UseMO.isKill()) {
       MachineInstr *UseMI = UseMO.getParent();
+#if 0
       unsigned SReg, DReg;
       if (!tii_->isMoveInstr(*UseMI, SReg, DReg))
         continue;
+#endif
       unsigned UseIdx = li_->getUseIndex(li_->getInstructionIndex(UseMI));
       if (JoinedCopies.count(UseMI))
         continue;
       const LiveRange *UI = LI.getLiveRangeContaining(UseIdx);
-      if (!LI.isKill(UI->valno, UseIdx+1))
+      if (!UI || !LI.isKill(UI->valno, UseIdx+1))
         UseMO.setIsKill(false);
     }
   }
-- 
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