tree 2c6d25511afd3baed2f9d5f4d397d8f05aab8cd2
parent ab1008255e37b5b51a433ed69e04c06300543799
author Martin Jambor <mjambor@suse.cz> 1635338942 +0200
committer Martin Jambor <mjambor@suse.cz> 1635340325 +0200
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ipa-cp: Use profile counters (or not) based on local availability

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.

gcc/ChangeLog:

2021-10-18  Martin Jambor  <mjambor@suse.cz>

	* ipa-cp.c (good_cloning_opportunity_p): Decide whether to use
	profile feedback depending on their local availability.