From f9fa8afdaaf973538df682c3e41a79762b1906bf 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

llvm-svn: 152209
---
 llvm/lib/CodeGen/ScheduleDAGInstrs.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/llvm/lib/CodeGen/ScheduleDAGInstrs.h b/llvm/lib/CodeGen/ScheduleDAGInstrs.h
index 7830f83fff5e..b09840dab4b1 100644
--- a/llvm/lib/CodeGen/ScheduleDAGInstrs.h
+++ b/llvm/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;