From: Jakob Stoklund Olesen <stoklund@2pi.dk>
Date: Mon, 30 Jul 2012 21:16:22 +0000 (+0000)
Subject: Clarify invalidation strategy in comment.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=20f13c50d88560d75129f4a691fe6b477d04dc70;p=oota-llvm.git

Clarify invalidation strategy in comment.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160997 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/MachineTraceMetrics.h b/lib/CodeGen/MachineTraceMetrics.h
index 56ea74ea85f..732e4f6ef39 100644
--- a/lib/CodeGen/MachineTraceMetrics.h
+++ b/lib/CodeGen/MachineTraceMetrics.h
@@ -211,6 +211,12 @@ public:
 
   /// Invalidate cached information about MBB. This must be called *before* MBB
   /// is erased, or the CFG is otherwise changed.
+  ///
+  /// This invalidates per-block information about resource usage for MBB only,
+  /// and it invalidates per-trace information for any trace that passes
+  /// through MBB.
+  ///
+  /// Call Ensemble::getTrace() again to update any trace handles.
   void invalidate(const MachineBasicBlock *MBB);
 
 private: