Comment a strange field in ScheduleDAG.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180159 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/CodeGen/ScheduleDAGInstrs.h b/include/llvm/CodeGen/ScheduleDAGInstrs.h
index 2219520ca19f111bebbe78f0b7ed8136b9cf9be1..b71ece430511146be8a8031bed63de4e1c991b4c 100644 (file)
--- a/include/llvm/CodeGen/ScheduleDAGInstrs.h
+++ b/include/llvm/CodeGen/ScheduleDAGInstrs.h
@@ -105,6 +105,10 @@ namespace llvm {
     MachineBasicBlock::iterator RegionEnd;
 
     /// The index in BB of RegionEnd.
+    ///
+    /// This is the instruction number from the top of the current block, not
+    /// the SlotIndex. It is only used by the AntiDepBreaker and should be
+    /// removed once that client is obsolete.
     unsigned EndIndex;
 
     /// After calling BuildSchedGraph, each machine instruction in the current