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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug ipa/99785] Awful lot of time spent building gl.cc in Firefox
Date: Fri, 26 Mar 2021 10:11:57 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99785

--- Comment #12 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #11)
> Btw, GCC 10 branch tip with -O1:
>=20
>  ipa inlining heuristics            : 962.91 ( 85%)   0.39 (  4%) 971.66 (
> 84%) 1103801 kB ( 10%)
>  alias stmt walking                 :  40.95 (  4%)   1.07 ( 11%)  42.13 =
(=20
> 4%)   25965 kB (  0%)
>  integration                        :  13.66 (  1%)   3.23 ( 33%)  16.18 =
(=20
> 1%) 4931059 kB ( 43%)
>  TOTAL                              :1135.79          9.69       1153.79=
=20=20=20=20
> 11462287 kB
> 1135.79user 9.73system 19:13.82elapsed 99%CPU (0avgtext+0avgdata
> 4090216maxresident)k
> 0inputs+0outputs (0major+959014minor)pagefaults 0swaps

And a profile of trunk with release checking shows

Samples: 4M of event 'cycles:u', Event count (approx.): 4811472248176=20=20=
=20=20=20=20=20=20=20=20=20
Overhead       Samples  Command  Shared Object     Symbol=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
  31.07%       1371974  cc1plus  cc1plus           [.] update_callee_keys
  25.52%       1128500  cc1plus  cc1plus           [.] edge_badness
   4.91%        216874  cc1plus  cc1plus           [.]
evaluate_properties_for_edge
   3.90%        172368  cc1plus  cc1plus           [.]
cgraph_node::get_availability
   3.83%        169169  cc1plus  cc1plus           [.] do_estimate_edge_time
   2.56%        113399  cc1plus  cc1plus           [.]
symtab_node::ultimate_alias_target_1

I wonder why we even run into this for the always inlines.=