[PATCH] D54819: [SampleFDO] Skip profile reading when flatten profile is used in ThinLTO postlink phase

[Wei Mi via Phabricator via llvm-commits]

wmi created this revision.
wmi added reviewers: danielcdh, tejohnson.
Herald added subscribers: dexonsmith, inglorion, mehdi_amini.

If the sample profile has no inlining hierachy information included, we call the sample profile is flatten. For flatten profile, in ThinLTO postlink phase, SampleProfileLoader's hot function inlining and profile annotation will do nothing, so it is better to save the effort to read in the profile (pass running will be skipped too because no profile is available). It is helpful for reducing compile time when the flatten profile is huge.


Repository:
  rL LLVM

https://reviews.llvm.org/D54819

Files:
  include/llvm/Transforms/IPO/SampleProfile.h
  lib/Passes/PassBuilder.cpp
  lib/Transforms/IPO/SampleProfile.cpp
  test/Transforms/SampleProfile/Inputs/flatten.prof
  test/Transforms/SampleProfile/flatten.ll

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