[PATCH] D81981: [PGO] Supplement PGO profile with Sample profile

[David Li via Phabricator via llvm-commits]

davidxl added a comment.

The PGOUse pass can choose not to annotate any branches with total weights == 0. Now the question becomes how do we tell PGOUse pass whether the entry should be set to 0 or leave it not set. There are two ways to do it (to signal it is not really cold, but unknown):

1. Remove the function from the indexed format profile;
2. set all counts to some sentinel value such as -1.


Repository:
  rL LLVM

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  https://reviews.llvm.org/D81981/new/

https://reviews.llvm.org/D81981