Path: chuka.playstation.co.uk!news
From: "Kenny Millar" <kenny@kmillar.co.uk>
Newsgroups: scee.yaroze.freetalk.english
Subject: Re: sqrt function.
Date: Mon, 27 Oct 2003 10:08:14 -0000
Organization: PlayStation Net Yaroze (SCEE)
Lines: 90
Message-ID: <bnirli$fi1@www.netyaroze-europe.com>
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Thanks Andrew, that solves the problem.

-Kenny

"Andrew Partington" <andrew.partington90@ntlworld.com> wrote in message
news:bn9ro2$m4k24@www.netyaroze-europe.com...
> Hi Kenny,
>
> Is this the sqrt() function in the standard maths lib you're talking
> about?
>
> If so, I can't help you, but I curently use the following code for doing
> square roots, I think I may have found it on a Yaroze members website or
> on the newsgroups, but i'm not sure who the author really is.
>
> Maybe this one will work for you - it's reputed to be quicker than the
> standard one anyway.
>
> Cheers,
>
> Andy P
>
>
>
> #define STEP(k) s=r+(1L<<k*2);r>>=1;if(s<=v){v-=s;r|=(1L<<k*2);}
>
>
>
> unsigned long    sqrt_u_32(unsigned long n)
>
> {
>
>      unsigned long    r=0,s,v=n;
>
>
>
>      STEP(15);STEP(14);STEP(13);STEP(12);
>
>      STEP(11);STEP(10);STEP(9);STEP(8);
>
>      STEP(7);STEP(6);STEP(5);STEP(4);
>
>      STEP(3);STEP(2);STEP(1);STEP(0);
>
>      return r;
>
> }
>
> unsigned short        sqrt_u_16(unsigned short n)
>
> {
>
>      register unsigned short     r=0,s,v=n;
>
>
>
>      STEP(7);STEP(6);STEP(5);STEP(4);
>
>      STEP(3);STEP(2);STEP(1);STEP(0);
>
>      return r;
>
> }
>
>
> Kenny Millar wrote:
> > Hi all,
> >
> > I finally got my build environment to work under XP Pro.
> >
> > However, using FCC 2.8.1 - whenever I use the sqrt function the PSX
hangs
> > completly.
> >
> > even just doing this....
> >
> > x=sqrt(16);
> >
> > hangs the console.
> >
> > Anyone else using sqrt having this trouble?
> >
> > -Kenny
> >
> >
>
>
>