Re: The Emacs master is much slower than the emacs-27 branch.

[Óscar Fuentes]

Gregory Heytings via "Emacs development discussions."
<emacs-devel@gnu.org> writes:

>>
>> Sorry.  I'm still too dumb to understand
>>
>
> No, you are definitely not! :-)
>
>>
>> so I ask the following instead:
>>
>> (1) I can always compare -O1, -O2 and -O3 builds because these were
>> _not_ affected by Paul's changes.  Right?
>>
>
> Yes.
>
>>
>> (2) I cannot compare -Og builds because these _are_ affected by
>> Paul's changes.  At least Emacs 27 vs Emacs non-27 ones.  Right?
>>
>
> Yes.
>
>>
>> (3) I'm yet unsure about -O0 builds.  Are they (1)- or (2)-like?
>>
>
> Like (2), at least with GCC on 64-bit GNU/Linux.  Apparently Eli does
> not see this on MS-Windows.

-O0 does not observe the "inline" declaration nor does consider "static"
functions for inlining, so -O0 should be comparable among versions,
since the "extern inline" -> "static" -> "static inline" changes are not
considered by -O0.