From: "H. Peter Anvin" <hpa@zytor.com>
To: Rob Landley <rob@landley.net>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
Sam Ravnborg <sam@ravnborg.org>,
Embedded Linux mailing list <linux-embedded@vger.kernel.org>,
linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH 1/3]: Replace kernel/timeconst.pl with kernel/timeconst.sh
Date: Sun, 04 Jan 2009 12:39:36 -0800 [thread overview]
Message-ID: <49611E88.6010204@zytor.com> (raw)
In-Reply-To: <200901041303.12687.rob@landley.net>
Rob Landley wrote:
>
> C) The only calculation which can overflow 64 bits (the ADJ32 one) turns out
> not to need arbitrary precision math, just 72 bits, and if it ever uses more
> than 32 then bottom 32 are all zero before the divide so you can do it in
> three lines.
>
... for the current code (32 bits). When we get an overflow-less 64-bit
implementation, this code will have to be redone, which is not true for
a properly done implementation.
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
next prev parent reply other threads:[~2009-01-04 20:39 UTC|newest]
Thread overview: 165+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-02 8:07 PATCH [0/3]: Simplify the kernel build by removing perl Rob Landley
2009-01-02 8:13 ` [PATCH 1/3]: Replace kernel/timeconst.pl with kernel/timeconst.sh Rob Landley
2009-01-02 8:13 ` Rob Landley
2009-01-02 9:04 ` Sam Ravnborg
2009-01-02 12:00 ` Rob Landley
2009-01-02 19:33 ` H. Peter Anvin
2009-01-04 1:32 ` Rob Landley
2009-01-04 1:35 ` H. Peter Anvin
2009-01-04 12:07 ` Alan Cox
2009-01-04 18:36 ` H. Peter Anvin
2009-01-04 19:03 ` Rob Landley
2009-01-04 20:39 ` H. Peter Anvin [this message]
2009-01-05 0:59 ` Rob Landley
2009-01-03 6:28 ` Harvey Harrison
2009-01-03 12:28 ` Ingo Oeser
2009-01-04 1:36 ` Rob Landley
2009-01-04 1:36 ` Rob Landley
2009-01-04 5:07 ` Valdis.Kletnieks
2009-01-04 6:43 ` Rob Landley
2009-01-04 22:13 ` Jamie Lokier
2009-01-05 0:15 ` Bernd Petrovitsch
2009-01-05 2:23 ` Jamie Lokier
2009-01-05 10:46 ` Bernd Petrovitsch
2009-01-05 15:01 ` Jamie Lokier
2009-01-05 16:18 ` Bernd Petrovitsch
2009-01-06 0:06 ` Rob Landley
2009-01-05 21:07 ` Rob Landley
2009-01-05 4:50 ` Rob Landley
2009-01-05 12:29 ` Bernd Petrovitsch
2009-01-04 21:51 ` Alejandro Mery
2009-01-04 7:15 ` Michal Jaegermann
2009-01-04 7:15 ` Michal Jaegermann
2009-01-05 0:41 ` Ray Lee
2009-01-05 5:08 ` Rob Landley
2009-01-02 8:14 ` [PATCH 2/3]: Remove perl from make headers_install Rob Landley
2009-01-02 8:14 ` Rob Landley
2009-01-02 9:09 ` Sam Ravnborg
2009-01-02 8:15 ` [PATCH 3/3]: Convert mkcapflags.pl to mkcapflags.sh Rob Landley
2009-01-02 8:15 ` Rob Landley
2009-01-02 9:12 ` Sam Ravnborg
2009-01-02 9:26 ` PATCH [0/3]: Simplify the kernel build by removing perl Arkadiusz Miskiewicz
2009-01-02 9:26 ` Arkadiusz Miskiewicz
2009-01-02 9:49 ` Christoph Hellwig
2009-01-02 10:16 ` Alejandro Mery
2009-01-02 10:30 ` Mark Miller
2009-01-02 11:18 ` Matt Keenan
2009-01-02 11:18 ` Matt Keenan
2009-01-02 10:41 ` Måns Rullgård
2009-01-15 12:59 ` Pádraig Brady
2009-01-15 18:52 ` Jamie Lokier
2009-01-15 19:45 ` Måns Rullgård
2009-01-02 11:15 ` Rob Landley
2009-01-02 11:15 ` Rob Landley
2009-01-02 11:44 ` Sam Ravnborg
2009-01-02 12:56 ` Rob Landley
2009-01-02 14:04 ` Theodore Tso
2009-01-03 3:22 ` Jamie Lokier
2009-01-03 3:22 ` Jamie Lokier
2009-01-04 2:23 ` Rob Landley
2009-01-02 10:02 ` Mark Miller
2009-01-02 10:02 ` Mark Miller
2009-01-02 10:03 ` Mark Miller
2009-01-02 10:03 ` Mark Miller
2009-01-02 11:13 ` Rob Landley
2009-01-02 16:04 ` Matthieu CASTET
2009-01-02 16:04 ` Matthieu CASTET
2009-01-03 19:46 ` Rob Landley
2009-01-03 19:46 ` Rob Landley
2009-01-03 20:10 ` Sam Ravnborg
2009-01-03 20:50 ` H. Peter Anvin
2009-01-04 1:47 ` Rob Landley
2009-01-04 1:45 ` Rob Landley
2009-01-04 8:09 ` Sam Ravnborg
2009-01-04 20:19 ` Rob Landley
2009-01-04 0:44 ` Robert Hancock
2009-01-04 1:39 ` David Brownell
2009-01-04 3:05 ` Rob Landley
2009-01-04 1:32 ` Rob Landley
2009-01-04 1:32 ` Rob Landley
2009-01-02 9:50 ` Paul Mundt
2009-01-02 10:32 ` Mark Miller
2009-01-02 10:57 ` Paul Mundt
2009-01-02 12:11 ` Mark Miller
2009-01-02 12:44 ` Rob Landley
2009-01-02 17:25 ` Wookey
2009-01-02 18:01 ` Sam Ravnborg
2009-01-02 18:01 ` Sam Ravnborg
2009-01-02 19:27 ` H. Peter Anvin
2009-01-04 1:35 ` Rob Landley
2009-01-03 19:48 ` Rob Landley
2009-01-08 13:13 ` klaasjan gm
2009-01-08 15:04 ` Christian Gagneraud
2009-01-03 14:59 ` Wolfgang Denk
2009-01-03 22:54 ` Leon Woestenberg
2009-01-03 23:03 ` H. Peter Anvin
2009-01-04 0:37 ` Leon Woestenberg
2009-01-04 2:53 ` Rob Landley
2009-01-04 3:38 ` Markus Heidelberg
2009-01-04 4:57 ` Rob Landley
2009-01-04 2:06 ` Rob Landley
2009-01-04 2:14 ` H. Peter Anvin
2009-01-04 6:29 ` Rob Landley
2009-01-15 14:32 ` Pádraig Brady
2009-01-15 14:32 ` Pádraig Brady
2009-01-04 2:36 ` Jamie Lokier
2009-01-04 2:39 ` H. Peter Anvin
2009-01-04 2:43 ` H. Peter Anvin
2009-01-04 3:06 ` Paul Mundt
2009-01-04 10:23 ` Leon Woestenberg
2009-01-04 10:23 ` Leon Woestenberg
2009-01-08 13:29 ` Mike Frysinger
2009-01-11 12:45 ` Bernd Petrovitsch
2009-01-12 3:36 ` Mark A. Miller
2009-01-12 5:11 ` H. Peter Anvin
2009-01-12 5:23 ` Mark A. Miller
2009-01-12 8:20 ` Paul Mundt
2009-01-12 9:18 ` Mark A. Miller
2009-01-12 9:18 ` Mark A. Miller
2009-01-12 9:41 ` Paul Mundt
2009-01-12 10:03 ` Mark A. Miller
2009-01-12 10:03 ` Mark A. Miller
2009-01-12 10:34 ` Paul Mundt
2009-01-12 17:56 ` Rob Landley
2009-01-12 18:04 ` Alan Cox
2009-01-12 8:27 ` Peter Korsgaard
2009-01-12 17:45 ` Rob Landley
[not found] ` <31014a580901111928u586e2246uccf370ff941c8a01@mail.gmail.com>
2009-01-12 5:35 ` Sam Ravnborg
2009-01-12 5:50 ` Mark A. Miller
2009-01-12 10:18 ` Sam Ravnborg
2009-01-12 10:22 ` Mark A. Miller
2009-01-12 10:44 ` Alexander Neundorf
2009-01-12 10:55 ` Mark A. Miller
2009-01-12 11:04 ` Alexander Neundorf
2009-01-12 10:38 ` Paul Mundt
2009-01-14 2:51 ` Jamie Lokier
2009-01-14 2:51 ` Jamie Lokier
2009-01-16 6:11 ` Rob Landley
2009-01-16 7:28 ` Alexander Neundorf
2009-01-16 14:54 ` Valdis.Kletnieks
2009-01-16 21:54 ` Rob Landley
2009-01-17 9:51 ` Jamie Lokier
2009-01-18 1:44 ` Rob Landley
2009-01-04 16:22 ` Vladimir Dronnikov
2009-01-04 16:22 ` Vladimir Dronnikov
2009-01-04 1:24 ` PATCH [0/3]: Simplify the kernel build by removing perl v2 Rob Landley
2009-01-04 1:27 ` PATCH [1/3]: Replace kernel/timeconst.pl with kernel/timeconst.sh (v2) Rob Landley
2009-01-04 1:27 ` Rob Landley
2009-01-04 2:48 ` David Vrabel
2009-01-04 20:21 ` Rob Landley
2009-01-04 1:28 ` PATCH [2/3]: Remove perl from make headers_install Rob Landley
2009-01-04 1:28 ` Rob Landley
2009-01-04 1:29 ` PATCH [3/3]: Convert kernel/cpu/mkcapflags.pl to kernel/cpu/mkcapflags.sh Rob Landley
2009-01-04 1:29 ` Rob Landley
-- strict thread matches above, loose matches on Subject: below --
2009-09-19 1:25 [PATCH 0/3] Perl removal patches for 2.6.31 Rob Landley
2009-09-19 1:33 ` [PATCH 1/3]: Replace kernel/timeconst.pl with kernel/timeconst.sh Rob Landley
2009-12-08 9:17 [PATCH 0/3] clean out Perl from build system Rob Landley
2009-12-08 9:19 ` [PATCH 1/3] Replace kernel/timeconst.pl with kernel/timeconst.sh Rob Landley
2009-12-09 15:45 ` Michal Marek
2009-12-09 23:40 ` Rob Landley
2009-12-09 23:45 ` H. Peter Anvin
2009-12-10 1:50 ` Rob Landley
2009-12-10 1:53 ` H. Peter Anvin
2009-12-10 13:52 ` Michal Marek
2009-12-10 23:16 ` Rob Landley
2009-12-11 15:31 ` Michal Marek
2009-12-11 19:13 ` H. Peter Anvin
2009-12-12 0:49 ` Rob Landley
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