[PATCH 4/4] ipa-cp: Select saner profile count to base heuristics on

[Martin Jambor]

Hi,

On Mon, Oct 18 2021, Martin Jambor wrote:
>
[...]
>
>
> This is a follow-up small patch to address Honza's review of my
> previous patch to select saner profile count to base heuristics on.
> Currently the IPA-CP heuristics switch to PGO-mode only if there are
> PGO counters available for any part of the call graph.  This change
> makes it to switch to the PGO mode only if any of the incoming edges
> bringing in the constant in question had any ipa-quality counts on
> them.  Consequently, if a part of the program is built with
> -fprofile-use and another part without, IPA-CP will use
> estimated-frequency-based heuristics for the latter.
>
> I still wonder whether this should only happen with
> flag_profile_partial_training on.  It seems like we're behaving as if
> it was always on.
>

Honza approved this patch in a private conversation and so I have pushed
it to master as commit ab810952eb7c061e37054ddd1dfe0aa033365131.

Thanks,

Martin