Article View: comp.sys.nsc.32k
Article #1083Re: NS32310 Vs NS32381
From: mash
Date: Wed, 22 Apr 1987 07:25
Date: Wed, 22 Apr 1987 07:25
19 lines
1662 bytes
1662 bytes
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>
UUCP: {decvax,ucbvax,ihnp4}!decwrl!mips!mash, DDD: 408-720-1700, x253
USPS: MIPS Computer Systems, 930 E. Arques, Sunnyvale, CA 94086
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!utgpu!water!watmath!clyde!rutgers!ames!oliveb!pyramid!prls!mips!mash 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