From: Andrew Trick <atrick@apple.com>
Date: Wed, 10 Oct 2012 05:43:16 +0000 (+0000)
Subject: TODO comment
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=85c7b6108f8c8cea77d0bce30343f736f6c15981;p=oota-llvm.git

TODO comment

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165605 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/include/llvm/MC/MCSubtargetInfo.h b/include/llvm/MC/MCSubtargetInfo.h
index 451f435fe39..69213cd77d9 100644
--- a/include/llvm/MC/MCSubtargetInfo.h
+++ b/include/llvm/MC/MCSubtargetInfo.h
@@ -109,6 +109,9 @@ public:
 
   int getReadAdvanceCycles(const MCSchedClassDesc *SC, unsigned UseIdx,
                            unsigned WriteResID) const {
+    // TODO: The number of read advance entries in a class can be significant
+    // (~50). Consider compressing the WriteID into a dense ID of those that are
+    // used by ReadAdvance and representing them as a bitset.
     for (const MCReadAdvanceEntry *I = &ReadAdvanceTable[SC->ReadAdvanceIdx],
            *E = I + SC->NumReadAdvanceEntries; I != E; ++I) {
       if (I->UseIdx < UseIdx)