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From: Reddy K <haritha.ponnolu@gmail.com>
Date: Mon, 20 Jun 2022 16:53:18 +0530
Message-ID: <CAF7YG7oSCLTarwcFgCzF7WFjOWf1qXjsP==iwphub=dN=RDJ2w@mail.gmail.com>
Subject: Re: Regarding FD_ZERO compilation warning
To: Florian Weimer <fweimer@redhat.com>
Cc: Reddy K via Libc-help <libc-help@sourceware.org>
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Hi Florian,

I am including the below header files.

#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/select.h>

Thanks & Regards
Haritha

On Mon, Jun 20, 2022 at 4:39 PM Florian Weimer <fweimer@redhat.com> wrote:

> * Reddy K.:
>
> > Hi Florian,
> > Thank you very much for your help.
> >
> > As you suggested, I have generated  preprocessed sources with gcc -E.
> Please find macro
> > expansion below.
> > -------------------
> >  do { int __d0, __d1; __asm__ __volatile__ ("cld; rep; " "stosq" : "=c"
> (__d0), "=D" (__d1) :
> > "a" (0), "0" (sizeof (fd_set) / sizeof (__fd_mask)), "1"
> (&((&readfds)->__fds_bits)[0]) :
> > "memory"); } while (0);
> > ---------------------
>
> Ahh, that code was removed upstream in:
>
> commit 3430ed09d3bef58dbf3fe18d87716236883599d8
> Author: Florian Weimer <fweimer@redhat.com>
> Date:   Sun Feb 9 11:01:39 2020 +0100
>
>     x86: Remove <bits/select.h> and use the generic version
>
>     Particularly on CPUs without ERMS, the string instructions are slow,
>     so it is unclear whether this architecture-specific implementation is
>     in fact an optimization.
>
> If you need this backported in a distribution build, please contact your
> distribution about backporting the change.
>
> Thanks,
> Florian
>
>