From e7ea8aa48a266f22f2c07003313e49174c6d9037 Mon Sep 17 00:00:00 2001
From: Andrew Trick <atrick@apple.com>
Date: Sat, 1 Dec 2012 01:22:38 +0000
Subject: misched: fix RegionBegin when DebugValues get shuffled to the top.

assert (RemainingInstrs == 0 && "Instruction count mismatch!")

rdar://12776937.

llvm-svn: 169069
---
 llvm/lib/CodeGen/MachineScheduler.cpp | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'llvm/lib/CodeGen/MachineScheduler.cpp')

diff --git a/llvm/lib/CodeGen/MachineScheduler.cpp b/llvm/lib/CodeGen/MachineScheduler.cpp
index b3e38f64ff0..cc7aabda3c3 100644
--- a/llvm/lib/CodeGen/MachineScheduler.cpp
+++ b/llvm/lib/CodeGen/MachineScheduler.cpp
@@ -674,6 +674,8 @@ void ScheduleDAGMI::placeDebugValues() {
     std::pair<MachineInstr *, MachineInstr *> P = *prior(DI);
     MachineInstr *DbgValue = P.first;
     MachineBasicBlock::iterator OrigPrevMI = P.second;
+    if (&*RegionBegin == DbgValue)
+      ++RegionBegin;
     BB->splice(++OrigPrevMI, BB, DbgValue);
     if (OrigPrevMI == llvm::prior(RegionEnd))
       RegionEnd = DbgValue;
-- 
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