[Bug ipa/125809] [16/17 Regression] ipa-cp over-clones under a guessed profile: devirtualization_time_bonus frequency-weighting (r16-3990-gad3fb999a1b568) inflates the bonus, ~8% slower cc1 build (SPEC 721.gcc_r)

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125809

Drea Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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             Status|UNCONFIRMED                 |WAITING
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2026-06-15

--- Comment #2 from Drea Pinski <pinskia at gcc dot gnu.org> ---
>Before ad3fb999a1b (and with our proposed fix) worker is not specialized: the 
>one hot indirect call is not worth a clone under a guessed profile. 

I am not sure that is the issue causing the slow down though.

> tree-ssa-sccvn.cc:process_bb (called from do_rpo_vn) is split into two 
> context clones (iterate=0/iterate=1) instead of one.

Are you running into more icache misses, more branch misses or does something
afterwards cause the slow down?

Because for me cloning specifically for devirtualization seems like will always
be a win.

I am not sure you are evulating the problem with the final code produced but
just getting at the symptom here.