From 918f38ab2420bbdc350a6ec8c6ba6b09e37126b2 Mon Sep 17 00:00:00 2001
From: Andrew Trick <atrick@apple.com>
Date: Fri, 20 Apr 2012 20:05:21 +0000
Subject: misched: initialize BB

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155226 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/ScheduleDAGInstrs.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

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

diff --git a/lib/CodeGen/ScheduleDAGInstrs.cpp b/lib/CodeGen/ScheduleDAGInstrs.cpp
index d46eb896e5..ae49b05858 100644
--- a/lib/CodeGen/ScheduleDAGInstrs.cpp
+++ b/lib/CodeGen/ScheduleDAGInstrs.cpp
@@ -126,7 +126,8 @@ static const Value *getUnderlyingObjectForInstr(const MachineInstr *MI,
   return 0;
 }
 
-void ScheduleDAGInstrs::startBlock(MachineBasicBlock *BB) {
+void ScheduleDAGInstrs::startBlock(MachineBasicBlock *bb) {
+  BB = bb;
   LoopRegs.Deps.clear();
   if (MachineLoop *ML = MLI.getLoopFor(BB))
     if (BB == ML->getLoopLatch())
@@ -134,6 +135,7 @@ void ScheduleDAGInstrs::startBlock(MachineBasicBlock *BB) {
 }
 
 void ScheduleDAGInstrs::finishBlock() {
+  BB = 0;
   // Nothing to do.
 }
 
@@ -159,7 +161,7 @@ void ScheduleDAGInstrs::enterRegion(MachineBasicBlock *bb,
                                     MachineBasicBlock::iterator begin,
                                     MachineBasicBlock::iterator end,
                                     unsigned endcount) {
-  BB = bb;
+  assert(bb == BB && "startBlock should set BB");
   RegionBegin = begin;
   RegionEnd = end;
   EndIndex = endcount;
-- 
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