[PATCH] D82123: [PGO] Add a functionality to always instrument the func entry BB

[Wei Mi via Phabricator via llvm-commits]

wmi added a comment.

Thanks for the patch! I guess atomic update is to reduce the cost of the entry counter for application with many threads. How much difference there is w/wo enabling -atomic-first-counter?


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  https://reviews.llvm.org/D82123/new/

https://reviews.llvm.org/D82123