From owner-freebsd-hackers@FreeBSD.ORG  Mon Apr 28 06:53:18 2003
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 8265037B401
	for <freebsd-hackers@freebsd.org>;
	Mon, 28 Apr 2003 06:53:18 -0700 (PDT)
Received: from woozle.rinet.ru (woozle.rinet.ru [195.54.192.68])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 70ADE43FB1
	for <freebsd-hackers@freebsd.org>;
	Mon, 28 Apr 2003 06:53:17 -0700 (PDT)	(envelope-from marck@rinet.ru)
Received: from localhost (localhost [127.0.0.1])
	by woozle.rinet.ru (8.12.9/8.12.9) with ESMTP id h3SDrFeR078590
	for <freebsd-hackers@freebsd.org>;
	Mon, 28 Apr 2003 17:53:16 +0400 (MSD)	(envelope-from marck@rinet.ru)
Date: Mon, 28 Apr 2003 17:53:15 +0400 (MSD)
From: Dmitry Morozovsky <marck@rinet.ru>
To: freebsd-hackers@freebsd.org
In-Reply-To: <200304280054.h3S0sTi2006266@lurza.secnetix.de>
Message-ID: <20030428175010.K77005@woozle.rinet.ru>
References: <200304280054.h3S0sTi2006266@lurza.secnetix.de>
X-NCC-RegID: ru.rinet
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Subject: Re: x86-64 support
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 28 Apr 2003 13:53:18 -0000

On Mon, 28 Apr 2003, Oliver Fromme wrote:

OF> You don't need that; the digits of pi can be calculated
OF> quite easily with integer math.  This snippet is from my
OF> signature collection:
OF>
OF> int f[9800],b,c=9814,g,i;long a=1e4,d,e,h;main(){for(;b=c,c-=14;i=printf(
OF> "%04d",e+d/a),e=d%a)while(g=--b*2)d=h*b+a*(i?f[b]:a/5),h=d/--g,f[b]=d%g;}
OF>
OF> Of course it doesn't comply with style(9), otherwise it
OF> wouldn't fit into two lines.  Prettifying (de-obfuscating)
OF> it to make it style(9)-compliant is left as an exercise to
OF> the reader.  ;-)
OF>
OF> Regards
OF>    Oliver
OF>
OF> PS:  The number of digits is specified by the iteration
OF> counter c which starts at 9814 in this case, producing
OF> 2800 digits (35 rows on an 80-columns terminal).  The
OF> counter should be initialized with (digits / 4 + 1) * 14.
OF> Don't forget to make the f[] array sufficiently large.

In your particular case it does not work, at least under -stable (2.95);
moreover, it produces different (both wrong ;) output for -O and -O0 cases.

Actually, it's all because f[] isn't large enough ;-)

Sincerely,
D.Marck                                   [DM5020, DM268-RIPE, DM3-RIPN]
------------------------------------------------------------------------
*** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck@rinet.ru ***
------------------------------------------------------------------------