From e6cd757e6800b9b94a6459ec148c0624c4f2e3c1 Mon Sep 17 00:00:00 2001
From: Dan Gohman <gohman@apple.com>
Date: Thu, 13 May 2010 20:34:42 +0000
Subject: Teach MachineLICM and MachineSink how to clear kill flags
 conservatively when they move instructions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103737 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/MachineSink.cpp | 5 +++++
 1 file changed, 5 insertions(+)

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

diff --git a/lib/CodeGen/MachineSink.cpp b/lib/CodeGen/MachineSink.cpp
index ef489dc556..1610e6c961 100644
--- a/lib/CodeGen/MachineSink.cpp
+++ b/lib/CodeGen/MachineSink.cpp
@@ -314,5 +314,10 @@ bool MachineSinking::SinkInstruction(MachineInstr *MI, bool &SawStore) {
   // Move the instruction.
   SuccToSinkTo->splice(InsertPos, ParentBlock, MI,
                        ++MachineBasicBlock::iterator(MI));
+
+  // Conservatively, clear any kill flags, since it's possible that
+  // they are no longer correct.
+  MI->clearKillInfo();
+
   return true;
 }
-- 
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