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From: h112706@assari.tut.fi (Herranen Henrik)
Newsgroups: comp.sys.amiga
Subject: Re: Amiga Competitiveness.
Message-ID: <1990Oct1.193036.14884@assari.tut.fi>
Date: 1 Oct 90 19:30:36 GMT
References: <1990Sep28.193008.6137@sisd.kodak.com> <1990Sep29.081216.17970@assari.tut.fi> <1990Oct1.132509.8967@sisd.kodak.com>
Organization: Tampere University of Technology
Lines: 37


In article <1990Oct1.132509.8967@sisd.kodak.com> jeh@sisd.kodak.com (Ed Hanway) writes:
>h112706@assari.tut.fi (Herranen Henrik) writes:
>>
>>In article <1990Sep28.193008.6137@sisd.kodak.com> jeh@sisd.kodak.com (Ed Hanway) writes:
>>>Yes, for an 8-hour ray tracing, saving one hour would be significant.
>>>Ray tracing, however, depends almost entirely on floating point speed.
>>>A 14MHz 68000 won't do a whole lot for that, but an add-on 68881 might.
>>
>>Doesn't floating point calculating use heavily the slowest commands in the
>>68000/68010, divide and multiply? I've noticed that after I inserted the
>>68020 in my B2000, many Mandelbrot programs speeded up with 20-25% while
  ^^^^^
>>AmigaBASIC only gained 5%.
>
>I'll concede that software floating-point emulation code does probably make
>heavy use of integer multiply and/or divide instructions, which should
>benefit from a faster CPU, even without correspondingly fast memory.  These
>instructions also benefit from improved microcode in the 68010 and later
>chips.
>
>I stand by my original assertion that slight speedups are only noticeable for
>lengthy operations.  It turns out that ray tracing and Mandelbrot calculations
>happen to be good examples of applications that do benefit from slight (<50%)
>speedups.
>
>Ed Hanway
>uunet!sisd!jeh

DAMN! DAMN! DAMN!

I meant of course I changed the 68010 to my B2000, NOT 68020.
Sorry.
-- 
Name:     Henrik 'Leopold' Herranen  h112706@lehtori.tut.fi
Address:  TTKK/P{{rakennuksen neuvonta/PL527/33101 Tampere/Suomi Finlandia

"On d{htinen daevas ja kuutamoy|, on morsiamelta katkaistu p{{"   E.L.1989