GNU bug report logs - #70036
30.0.50; Move file-truename to the C level

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Ihor Radchenko <yantar92 <at> posteo.net>
Cc: 70036 <at> debbugs.gnu.org, theo <at> thornhill.no
Subject: bug#70036: 30.0.50; Move file-truename to the C level
Date: Thu, 28 Mar 2024 15:52:23 +0200

> Cc: 70036 <at> debbugs.gnu.org
> From: Ihor Radchenko <yantar92 <at> posteo.net>
> Date: Thu, 28 Mar 2024 11:51:06 +0000
> 
> If the slow parts of `file-truename' are the calls to C subroutines,
> rewriting `file-truename' in C will not help much with the performance.

That is only true if the C implementation uses the same C subroutines,
or their bodies.  If, instead, the C implementation uses something
like 'realpath', which produces the fully resolved file name ion one
go, then the profile from the Lisp implementation is not really
relevant.

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