From: Patrick McHardy <kaber@trash.net>
To: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Cc: wli@movementarian.org, linux-kernel@vger.kernel.org,
netdev@vger.kernel.org, netfilter-devel@vger.kernel.org,
Rusty Russell <rusty@rustcorp.com.au>
Subject: Re: [PATCH] Update jhash.h with the new version of Jenkins' hash
Date: Thu, 12 Feb 2009 10:16:39 +0100 [thread overview]
Message-ID: <4993E8F7.6070007@trash.net> (raw)
In-Reply-To: <alpine.DEB.2.00.0902121006440.18739@blackhole.kfki.hu>
Jozsef Kadlecsik wrote:
> -#define __jhash_mix(a, b, c) \
> +#define __rot(x,k) (((x)<<(k)) | ((x)>>(32-(k))))
> +
> +/* __jhash_mix - mix 3 32-bit values reversibly. */
> +#define __jhash_mix(a,b,c) \
> +{ \
> + a -= c; a ^= __rot(c, 4); c += b; \
> + b -= a; b ^= __rot(a, 6); a += c; \
> + c -= b; c ^= __rot(b, 8); b += a; \
> + a -= c; a ^= __rot(c,16); c += b; \
> + b -= a; b ^= __rot(a,19); a += c; \
> + c -= b; c ^= __rot(b, 4); b += a; \
> +}
include/linux/bitops.h includes multiple rot variants. rol32()
looks approriate.
next prev parent reply other threads:[~2009-02-12 9:16 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-11 10:19 [PATCH] Update jhash.h with the new version of Jenkins' hash Jozsef Kadlecsik
2009-02-11 20:19 ` Michał Mirosław
2009-02-11 22:50 ` Jozsef Kadlecsik
2009-02-11 23:23 ` Michał Mirosław
2009-02-12 0:12 ` wli
2009-02-12 0:29 ` David Miller
2009-02-12 0:41 ` Jan Engelhardt
2009-02-12 9:05 ` Jarek Poplawski
2009-02-12 9:55 ` Jarek Poplawski
2009-02-12 9:11 ` Jozsef Kadlecsik
2009-02-12 9:16 ` Patrick McHardy [this message]
2009-02-12 9:41 ` Jozsef Kadlecsik
2009-02-12 13:46 ` Kyle Moffett
2009-02-17 17:13 ` Jozsef Kadlecsik
2009-02-18 5:11 ` Rusty Russell
2009-02-18 11:50 ` Ilpo Järvinen
2009-02-12 19:58 ` Eric W. Biederman
2009-02-12 2:58 ` Rusty Russell
-- strict thread matches above, loose matches on Subject: below --
2009-02-10 19:40 Jozsef Kadlecsik
2009-02-10 21:19 ` Scott Feldman
2009-02-10 22:03 ` Jozsef Kadlecsik
2009-02-11 1:17 ` David Miller
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