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

[Gregory Heytings]

> Apparently I currently can't use -Og when comparing benchmarks of older 
> Emacsen with Emacs 28 ones because the former don't use static inlines. 
> I just wanted to know whether -O0 builds of Emacs 28 are also affected 
> by Paul's change because it's those I use for debugging.

No they are not.  As I told you in my previous mail, commit 
b9b32074cecb0e0d20cf527eadacbb0b7f5cced9 (Apr 7 2020) restores static 
inlines in the master branch.

In short:

before commit 365dad197bac5deec9244fd9c189d23c46c99b31 (Sep 4 2019) 
'extern inline' was the default; this includes Emacs 26 releases

after commit 365dad197bac5deec9244fd9c189d23c46c99b31 'static' became the 
default; this affects Emacs 27.1 and 27.2

after commit b9b32074cecb0e0d20cf527eadacbb0b7f5cced9 'static inline' 
became the default; this will be the default for Emacs 28