| 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
| ||
|
Message-ID: <20070226160708.3c7a8d29@freekitty> Date: Mon, 26 Feb 2007 16:07:08 -0800 From: Stephen Hemminger <shemminger@...ux-foundation.org> To: Jan Engelhardt <jengelh@...ux01.gwdg.de> Cc: linux-kernel@...r.kernel.org, netdev@...r.kernel.org Subject: Re: [RFC] div64_64 support On Tue, 27 Feb 2007 01:05:26 +0100 (MET) Jan Engelhardt <jengelh@...ux01.gwdg.de> wrote: > > On Feb 26 2007 15:44, Stephen Hemminger wrote: > >> >- x = (2 * x + (uint32_t) div64_64(a, x*x)) / 3; > >> >+ x = (2 * x + (u32) (a / x*x)) / 3; > >> > >> Previously there was div64_64(a, x*x) which is equivalent to > >> (a)/(x*x), or just: a/(x^2). But now you do a/x*x, which is > >> equivalent to a*x/x (in the domain of real numbers). Furthermore, > >> a/x*x is a-(a%x), which does not even remotely match a/(x^2). > >> > >Been there, done that, don't want to repeat it... > > I am sorry I don't quite follow. Once before a missed paren's caused a TCP congestion window bug that took 6 months before it was found... -- Stephen Hemminger <shemminger@...ux-foundation.org> - 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/
Powered by blists - more mailing lists