[PATCH] D47955: [SampleFDO] Add a new compact binary format for sample profile

[Wei Mi via Phabricator via llvm-commits]

wmi created this revision.
wmi added reviewers: danielcdh, davidxl.
Herald added a subscriber: eraman.

Name table occupies a big chunk of size in current binary format sample profile. In order to reduce its size, the patch changes the sample writer/reader to save/restore MD5Hash of names in the name table. Sample annotation phase will also use MD5Hash of name to query samples accordingly.

Experiment shows compact binary format can reduce the size of sample profile by 2/3 compared with binary format generally.


Repository:
  rL LLVM

https://reviews.llvm.org/D47955

Files:
  include/llvm/ProfileData/SampleProf.h
  include/llvm/ProfileData/SampleProfReader.h
  include/llvm/ProfileData/SampleProfWriter.h
  lib/ProfileData/SampleProfReader.cpp
  lib/ProfileData/SampleProfWriter.cpp
  lib/Transforms/IPO/SampleProfile.cpp
  test/Transforms/SampleProfile/Inputs/inline.compactbinary.afdo
  test/Transforms/SampleProfile/compact-binary-profile.ll
  tools/llvm-profdata/llvm-profdata.cpp
  unittests/ProfileData/SampleProfTest.cpp

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