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From: lmb7421@ultb.isc.rit.edu (Les Barstow: Phoenix)
Newsgroups: comp.sys.apple
Subject: Re: ROM 04 GS and resolution
Message-ID: <2228@ultb.isc.rit.edu>
Date: 16 Feb 90 10:49:17 GMT
References: <16747.apple.net@pro-sol>
Reply-To: lmb7421@ultb.isc.rit.edu (Les Barstow: Phoenix)
Organization: Wandering Damage, Cosmo Police, Psi division
Lines: 23

I don't think we're being fair here - C compilers for the 68000 series
are very well developed and ironed out for optimization.  However, the
GS C compilers have not yet been written for speed - I seem to remember
a comparison done back when the GS came out, all code written in
Assembly for both machines, and the GS did rather well...

Comparing a 2.5 MHz GS to an 8MHz Mac, the GS actually won the Sieve
race, came close in others, and managed to hold some ground on the
rest... Remember, the average 65816 cycles/instruction is ~5, while the
minimum cycles/instruction on a 68000 series is ~4 (and goes up steeply
from there in increments of 2 or 4 cycles (can't remember which, just
remember seing instructions which took over 20 cycles to execute)...)

Don't under-estimate the power of the 65816 - even though it lacks some
instructions (notably MUL and DIV) and some other features
(multitudinous registers), but it is also more efficient and has some
unique features of its own (direct page, fast increments, etc...)

-- 
Les Barstow      |RIT - A citadel of gleaming brick towering over a snowy swamp
SunSinger        |Money - That which pays the bills.  A dream never remembered.
Phoenix rising...+-------------------------------------------------------------
LMB7421@ritvax.bitnet | lmb7421@ultb.isc.rit.edu |...rochester!rit!ultb!lmb7421