Date: Tue, 27 May 2003 09:56:58 +0100 From: Doug Rabson <dfr@nlsystems.com> To: freebsd-hackers@freebsd.org, Oliver Fromme <olli@secnetix.de> Subject: Re: x86-64 support Message-ID: <200305270956.58065.dfr@nlsystems.com> In-Reply-To: <200304280054.h3S0sTi2006266@lurza.secnetix.de> References: <200304280054.h3S0sTi2006266@lurza.secnetix.de>
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On Monday 28 April 2003 1:54 am, Oliver Fromme wrote:
> Narvi <narvi@haldjas.folklore.ee> wrote:
> > On Sat, 26 Apr 2003, M. Warner Losh wrote:
> > > In message: <20030427064014.H40030-100000@haldjas.folklore.ee>
> > >
> > > Narvi <narvi@haldjas.folklore.ee> writes:
> > > : option USE_PI_DIGITS 100
> > >
> > > Only if you could implement it with integer math :-)
> >
> > where's the problem in that ? most mp libs use integer arithmetic,
> > and x86-64 gives you 64x64->128 bit widening multiplies 8-)
>
> You don't need that; the digits of pi can be calculated
> quite easily with integer math. This snippet is from my
> signature collection:
>
> int f[9800],b,c=9814,g,i;long
> a=1e4,d,e,h;main(){for(;b=c,c-=14;i=printf(
> "%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 course it doesn't comply with style(9), otherwise it
> wouldn't fit into two lines. Prettifying (de-obfuscating)
> it to make it style(9)-compliant is left as an exercise to
> the reader. ;-)
Doesn't appear to work. When I run this, it prints '1877' followed by
lots of zeros...
--
Doug Rabson Mail: dfr@nlsystems.com
Phone: +44 20 8348 6160
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