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Date: Wed, 26 Jun 2024 16:11:18 +0200
From: Markus Wichmann <nullplan@....net>
To: musl@...ts.openwall.com
Subject: Re: roundf() (and round(), and ...)

Am Wed, Jun 26, 2024 at 03:43:27AM +0000 schrieb Thorsten Glaser:
> Markus Wichmann dixit:
>
> >memcpy() is special, in that GCC reserves the right to create calls to
> >it (and memmove(), memcmp(), and memset()) even in freestanding mode. It
> >doesn't do that for any other builtin.
>
> But not to replace code that implements a memcpy, only to implement
> things like struct copying.
>

No, there have been versions that would recognize you trying to write a
memcpy() and replacing it with a call to memcpy(). Which is fine, unless
you are actually writing a memcpy(). That is why musl now builds with
-fno-tree-loop-distribute-patterns if that is supported. Because that
was the optimizer making that decision, so it is now turned off.

Ciao,
Markus

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