Re: log2

[Eli Zaretskii]

> From: Po Lu <luangruo@yahoo.com>
> Date: Wed, 18 Jan 2023 20:01:36 +0800
> 
> commit 203ffc68468abaccfed7e8ee630d9aa143ce5dbf
> Author: Paul Eggert <eggert@cs.ucla.edu>
> Date:   Tue May 10 14:44:35 2022 -0700
> 
>     Port libm configure-time test to Solaris 11.4
>     
>     * configure.ac (LIB_MATH): Check all the math.h functions
>     that Emacs uses, not just sqrt (Bug#55294).
> 
> introduced a test for log2.  But some versions of Android lack that
> function, being one major operating system to not support all of the C99
> math functions.
> 
> Does Emacs actually use log2 anywhere?

Emacs uses log2 in Flog.