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From: mash@mips.UUCP
Newsgroups: comp.sys.nsc.32k
Subject: Re: NS32310 Vs NS32381
Message-ID: <326@winchester.UUCP>
Date: Wed, 22-Apr-87 02:25:27 EST
Article-I.D.: winchest.326
Posted: Wed Apr 22 02:25:27 1987
Date-Received: Thu, 23-Apr-87 23:40:33 EST
References: <145@unsvax.UUCP> <4221@nsc.nsc.com> <323@winchester.UUCP> <4222@nsc.nsc.com>
Reply-To: mash@winchester.UUCP (John Mashey)
Organization: MIPS Computer Systems, Sunnyvale, CA
Lines: 19

In article <4222@nsc.nsc.com> roger@nsc.nsc.com (Roger Thompson) writes:
> [re: NS32381 cycle counts]
>Adds and subtracts are actually a little slower than multiplies.
>They are approx 1.4 usec.  I don't have the exact numbers
>on divides with me, but recollection says its about 2 usec.
>Generally speaking, both single and double precision calculations
>take the same amount of time.

To summarize, I think what's been said is that multiplies are about
30 cycles, adds about 50, and divides about 60, for DP.
I'm not really familiar with 32081 timings: is the 32381 a bunch
faster [in cycle counts], or is any speedup mainly from clock rate?
I'm a lot more familiar with Whetstone/Linpack/etc ratings than
actual FP cycle counts: are these numbers competitive?
(at least with other microcoded parts like 80387 or 68881/68882?)
-- 
-john mashey	DISCLAIMER: <generic disclaimer, I speak for me only, etc>
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