From: Andrew Trick <atrick@apple.com>
Date: Wed, 7 Mar 2012 00:18:08 +0000 (+0000)
Subject: misched comments
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=e75537a243858d8293832109e61bafc8484bb52a;p=oota-llvm.git

misched comments

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152173 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/include/llvm/CodeGen/ScheduleDAG.h b/include/llvm/CodeGen/ScheduleDAG.h
index 72eadd9698c..e75d9361843 100644
--- a/include/llvm/CodeGen/ScheduleDAG.h
+++ b/include/llvm/CodeGen/ScheduleDAG.h
@@ -8,7 +8,8 @@
 //===----------------------------------------------------------------------===//
 //
 // This file implements the ScheduleDAG class, which is used as the common
-// base class for instruction schedulers.
+// base class for instruction schedulers. This encapsulates the scheduling DAG,
+// which is shared between SelectionDAG and MachineInstr scheduling.
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/lib/CodeGen/ScheduleDAGInstrs.h b/lib/CodeGen/ScheduleDAGInstrs.h
index c7ffed96b78..e3aaffb630b 100644
--- a/lib/CodeGen/ScheduleDAGInstrs.h
+++ b/lib/CodeGen/ScheduleDAGInstrs.h
@@ -112,6 +112,8 @@ namespace llvm {
     /// Live Intervals provides reaching defs in preRA scheduling.
     LiveIntervals *LIS;
 
+    /// After calling BuildSchedGraph, each machine instruction in the current
+    /// scheduling region is mapped to an SUnit.
     DenseMap<MachineInstr*, SUnit*> MISUnitMap;
 
     /// UnitLatencies (misnamed) flag avoids computing def-use latencies, using