[PATCH] D110117: [SamplePGO] Add switch to honor zero count on block level as accurate

[Wenlei He via Phabricator via llvm-commits]

wenlei added a comment.

This turns out to improve HHVM (https://github.com/facebook/hhvm) RPS by 0.1%, while reducing .text size by 4%, using AutoFDO. I hope to get it in first so we can do more evaluation. Eventually either add a new driver switch just like fprofile-sample-accurate, or merge it into fprofile-sample-accurate if it turns out to be helpful in general.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D110117/new/

https://reviews.llvm.org/D110117