[PATCH] D18342: Use Blob to record MDString

Mehdi AMINI via llvm-commits llvm-commits at lists.llvm.org
Mon Mar 21 18:46:32 PDT 2016

joker.eph created this revision.
joker.eph added a reviewer: tejohnson.
joker.eph added a subscriber: llvm-commits.

This makes encoding/decoding much simpler/faster. This is taking
a bit more space because of alignment over the current encoding
which is already fixed 8-bits.

- llvm-bcanalyzer reports on a RelWithDebInfo compile of
  DAGISelEmitter.cpp that the space occupied by the MDString goes
  from 12134612b to 12586813b (+3.7%). The total file goes from
  18513491b to 18965683b (+2.4%).
- MaterializeMetadata (during ThinLTO-link of llvm-tblgen) goes
  from 8.2s to 6.4s (-24.4%).



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