[Bug middle-end/100473] O2 vs optimization flags

pinskia at gcc dot gnu.org gcc-bugzilla@gcc.gnu.org
Fri May 7 16:00:46 GMT 2021


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100473

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|c                           |middle-end

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #2) 
> I think we've never claimed that -O2 stands for -O1 + specific options,
> similarly to how -O1 certainly is not -O0 + lots of options (even much more
> different, because if (optimize) is very common and is used in gating tests
> of whole pass sets.

From
https://gcc.gnu.org/onlinedocs/gcc-11.1.0/gcc/Optimize-Options.html#Optimize-Options
:
Not all optimizations are controlled directly by a flag. Only optimizations
that have a flag are listed in this section.


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