From: Matt Mackall <mpm@selenic.com>
To: linux-ia64@vger.kernel.org
Subject: Re: [mpm@selenic.com: Re: buggy ia64_fls() ? (was Re: /dev/random problem on 2.6.12-rc1)]
Date: Fri, 08 Apr 2005 23:17:02 +0000 [thread overview]
Message-ID: <20050408231702.GG3174@waste.org> (raw)
In-Reply-To: <20050408103324.6c5231df.akpm@osdl.org>
On Fri, Apr 08, 2005 at 04:02:15PM -0700, Luck, Tony wrote:
> >So there's the off-by-one problem. And then there's the huge
> >discontinuity at 0. Trouble is the bias is 65535 rather than 65536 so
> >there's no masking trick that works. We could instead to do
> >exp((x*2)+1).
>
> That will fail for x=0x8000000000000000 ... returns '1' instead of '64'.
That's ok, the function we actually need to fix is fls(int), not
ia64_fls(unsigned long).
--
Mathematics is the supreme nostalgia of our time.
next prev parent reply other threads:[~2005-04-08 23:17 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-04-08 17:33 [mpm@selenic.com: Re: buggy ia64_fls() ? (was Re: /dev/random Andrew Morton
2005-04-08 17:48 ` [mpm@selenic.com: Re: buggy ia64_fls() ? (was Re: /dev/random problem on 2.6.12-rc1)] Matt Mackall
2005-04-08 18:02 ` [mpm@selenic.com: Re: buggy ia64_fls() ? (was Re: /dev/random Andrew Morton
2005-04-08 19:05 ` David Mosberger
2005-04-08 20:46 ` [mpm@selenic.com: Re: buggy ia64_fls() ? (was Re: /dev/random problem on 2.6.12-rc1)] David Mosberger
2005-04-08 22:49 ` Matt Mackall
2005-04-08 23:01 ` David Mosberger
2005-04-08 23:02 ` Luck, Tony
2005-04-08 23:15 ` Matt Mackall
2005-04-08 23:17 ` Matt Mackall [this message]
2005-04-08 23:19 ` David Mosberger
2005-04-08 23:49 ` David Mosberger
2005-04-09 0:21 ` [mpm@selenic.com: Re: buggy ia64_fls() ? (was Re: /dev/random David Mosberger
2005-04-09 0:28 ` [mpm@selenic.com: Re: buggy ia64_fls() ? (was Re: /dev/random problem on 2.6.12-rc1)] Matt Mackall
2005-04-09 0:34 ` [mpm@selenic.com: Re: buggy ia64_fls() ? (was Re: /dev/random Arthur Kepner
2005-04-09 0:46 ` [mpm@selenic.com: Re: buggy ia64_fls() ? (was Re: /dev/random problem on 2.6.12-rc1)] Grant Grundler
2005-04-09 3:00 ` Grant Grundler
2005-04-09 4:05 ` David Mosberger
2005-04-09 4:32 ` David Mosberger
2005-04-09 5:09 ` [mpm@selenic.com: Re: buggy ia64_fls() ? (was Re: /dev/random David Mosberger
2005-04-09 5:16 ` [mpm@selenic.com: Re: buggy ia64_fls() ? (was Re: /dev/random problem on 2.6.12-rc1)] Grant Grundler
2005-04-09 6:00 ` David Mosberger
2005-04-22 3:50 ` [mpm@selenic.com: Re: buggy ia64_fls() ? (was Re: /dev/random Andrew Morton
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