From 2a06d4753ac7995ec9ff2f09bddf3072632eaf5d Mon Sep 17 00:00:00 2001 From: Andrew Trick Date: Wed, 10 Oct 2012 05:43:16 +0000 Subject: [PATCH] TODO comment llvm-svn: 165605 --- llvm/include/llvm/MC/MCSubtargetInfo.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/llvm/include/llvm/MC/MCSubtargetInfo.h b/llvm/include/llvm/MC/MCSubtargetInfo.h index 451f435..69213cd 100644 --- a/llvm/include/llvm/MC/MCSubtargetInfo.h +++ b/llvm/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) -- 2.7.4