With profile-feedback, the run-times used for opportunity evaluations
is not currently scaled to the total measured run time of the
program/compilation unit, which is an obvious mistake. This patch
adds such scaling by run-time which is however itself also scaled down
so that the resulting scores rougly fall in line with the scores on
hot loops we get using guessed profile.
gcc/ChangeLog:
2026-05-15 Martin Jambor <mjambor@suse.cz>
* ipa-cp.cc (overall_scaled_runtime): New.
(good_cloning_opportunity_p): Scale PGO evaluations by
overall_scaled_runtime.
(ipcp_propagate_stage): Calculate also overall_scaled_runtime and
print it and unscaled time.
(ipa_cp_cc_finalize): Set overall_scaled_runtime to zero.
* params.opt (ipa-cp-profile-runtime-scaling): New.
* doc/params.texi (ipa-cp-profile-runtime-scaling): New.
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