linux-kernel - Re: [PATCH] i386: optimize memset of 6 and 8 bytes

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1187401774.2789.0.camel@laptopd505.fenrus.org>
Date:	Fri, 17 Aug 2007 18:49:34 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Stephen Hemminger <shemminger@...ux-foundation.org>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] i386: optimize memset of 6 and 8 bytes


On Fri, 2007-08-17 at 16:50 -0700, Stephen Hemminger wrote:
> Tne network code does memset for 6 and 8 byte values, that can easily
> be optimized into simple assignments without string instructions.


so... question.
Why are we doing this by hand? Wouldn't gcc just generate this code in
the first place (when using __builtin_memset)? I very much suspect it
would (and if some version doesn't.... we really ought to get that
fixed)

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/