Path: chuka.playstation.co.uk!news
From: "Jon Prestidge  (Jon@surfed.to)" <jon@surfed.to>
Newsgroups: scee.yaroze.freetalk.english
Subject: Re: Daft Question [long]
Date: Wed, 29 Aug 2001 20:09:57 +0100
Organization: PlayStation Net Yaroze (SCEE)
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It probably is if you've seen it I was just guessing... I never noticed a
big difference in clock cycle useage with other processors between different
operations-- mind you I've never looked too closely, and they weren't risc.
I certainly never knew there was a co processor like Alex says so ignore
most of what I said John

> all arithmetic and logic
> operations take one cycle except for
> muls and divs which can take up to
> about 32 cycles.

... that's interesting....so 5+5+5+5+5+5 is qucker that 5*6 for example.
....although I suppose it'd have to fether the instructions too so perhaps
not.   I surprised that all the other instructions only take one cycle, I
guess that's risc.  I was guessing something like a logical shift would take
about 4 cycles and divide would take about 6, how wrong I was--- well that's
opened my eyes, I'll beable to optimise my code better now, cheers.


Jon