From 6fd7dd6ba57c1b5ba1f12e7e9da574b9dbd8ae09 Mon Sep 17 00:00:00 2001
From: Andrew Trick <atrick@apple.com>
Date: Wed, 7 Mar 2012 05:21:54 +0000
Subject: [PATCH] comment

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152209 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/ScheduleDAGInstrs.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/CodeGen/ScheduleDAGInstrs.h b/lib/CodeGen/ScheduleDAGInstrs.h
index 7830f83fff5..b09840dab4b 100644
--- a/lib/CodeGen/ScheduleDAGInstrs.h
+++ b/lib/CodeGen/ScheduleDAGInstrs.h
@@ -297,6 +297,8 @@ namespace llvm {
     /// Schedule - Order nodes according to selected style, filling
     /// in the Sequence member.
     ///
+    /// Typically, a scheduling algorithm will implement Schedule() without
+    /// overriding enterRegion() or exitRegion().
     virtual void Schedule() = 0;
 
     virtual void dumpNode(const SUnit *SU) const;