linux-kernel - Re: [RFC PATCH v1 2/5] tools/nolibc: x86-64: Use `rep stosb` for `memset()`

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Message-ID: <ZO9Oeq0bHU+NU29D@biznet-home.integral.gnuweeb.org>
Date:   Wed, 30 Aug 2023 21:13:14 +0700
From:   Ammar Faizi <ammarfaizi2@...weeb.org>
To:     Alviro Iskandar Setiawan <alviro.iskandar@...weeb.org>
Cc:     Willy Tarreau <w@....eu>,
        Thomas Weißschuh <linux@...ssschuh.net>,
        Nicholas Rosenberg <inori@...x.org>,
        Michael William Jonathan <moe@...weeb.org>,
        GNU/Weeb Mailing List <gwml@...r.gnuweeb.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v1 2/5] tools/nolibc: x86-64: Use `rep stosb` for
 `memset()`

On Wed, Aug 30, 2023 at 09:08:05PM +0700, Alviro Iskandar Setiawan wrote:
> The first instruction could be:
> 
>    movl %esi, %eax
> 
> That's smaller. Also, the second argument of memset() is an int
> anyway, so there is no need to have a full 64-bit copy of %rsi in
> %rax.

Agree, noted.

-- 
Ammar Faizi