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1994-07-29
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Newsgroups: alt.games.doom
Path: cdrom.com!barrnet.net!agate!howland.reston.ans.net!europa.eng.gtefsd.com!newsxfer.itd.umich.edu!nntp.cs.ubc.ca!magellan!ashdown
From: ashdown@mpr.ca (Scott Ashdown)
Subject: Re: Does a 486DX run Doom faster than an SX?
Message-ID: <1994Jul29.151916.28178@mprgate.mpr.ca>
Sender: news@mprgate.mpr.ca
Nntp-Posting-Host: atom
Organization: MPR Teltech Ltd., Burnaby, B.C., Canada
References: <3181vf$638@usenet.INS.CWRU.Edu>
Date: Fri, 29 Jul 1994 15:19:16 GMT
Lines: 29
In article <3181vf$638@usenet.INS.CWRU.Edu> ag848@cleveland.Freenet.Edu (Thomas Fimiani) writes:
>
>The 8087 family of math-coprocessors is more than an
>FPU, it is a NDP -- numeric data processor.
>
>*If* Doom makes use of the 8087, it would make a fairly
>noticable difference.
>
>The 8087 does integer & floating point calculations
>automatically, instead of through software emulation
>, which can amount to large differences in speed
>when just looking at the time to calculate (even
>up to 8-10 times faster).
80x87s, including their counterparts integrated into
some 486s, perform absolutely no integer math. That's
what the CPU's there for.
DOOM in no way, shape, or form, uses floating point
math. As a result, any difference in performance on
a 486SX and 486DX with the same clock rate is due to
some other factor besides the CPU.
--
Scott Ashdown
Engineer, MPR Teltech Ltd.
Burnaby, British Columbia, Canada.
ashdown@mprgate.mpr.ca