From 16716c730216e461a9b5b71d19f1c4eef257cecd Mon Sep 17 00:00:00 2001
From: Andrew Trick <atrick@apple.com>
Date: Thu, 10 May 2012 21:06:14 +0000
Subject: misched: Release only unscheduled nodes into ReadyQ.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156573 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/MachineScheduler.cpp | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

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

diff --git a/lib/CodeGen/MachineScheduler.cpp b/lib/CodeGen/MachineScheduler.cpp
index c6679c2666..55af22920a 100644
--- a/lib/CodeGen/MachineScheduler.cpp
+++ b/lib/CodeGen/MachineScheduler.cpp
@@ -643,6 +643,10 @@ struct ReadyQ {
 
   bool empty() const { return Queue.empty(); }
 
+  iterator begin() { return Queue.begin(); }
+
+  iterator end() { return Queue.end(); }
+
   iterator find(SUnit *SU) {
     return std::find(Queue.begin(), Queue.end(), SU);
   }
@@ -705,10 +709,12 @@ public:
   }
 
   virtual void releaseTopNode(SUnit *SU) {
-    TopQueue.push(SU);
+    if (!SU->isScheduled)
+      TopQueue.push(SU);
   }
   virtual void releaseBottomNode(SUnit *SU) {
-    BotQueue.push(SU);
+    if (!SU->isScheduled)
+      BotQueue.push(SU);
   }
 };
 } // namespace
-- 
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