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- Path: sparky!uunet!cbmvax!cbmehq!cbmger!rcshq!weigner
- From: weigner@rcshq.adsp.sub.org (Jan Weigner)
- Newsgroups: comp.sys.amiga.hardware
- Subject: Re: 040 vs Rocket Launcher
- Message-ID: <weigner.3610@rcshq.adsp.sub.org>
- Date: 27 Jan 93 09:28:26 GMT
- References: <73436@cup.portal.com> <weigner.3310@rcshq.adsp.sub.org> <1993Jan23.193715.27724@bmerh85.bnr.ca>
- Organization: RCS Management Germany
- Lines: 47
-
- In article <1993Jan23.193715.27724@bmerh85.bnr.ca> Hamish.Macdonald@bnr.ca (Hamish Macdonald) writes:
- >>>>>> On 22 Jan 93 11:12:58 GMT,
- >>>>>> In message <weigner.3504@rcshq.adsp.sub.org>,
- >>>>>> weigner@rcshq.adsp.sub.org (Jan Weigner) wrote:
- >
- >Jan> If you write optimised 68040 code (floating point, caches and
- >Jan> using one or two new commands) it will definetely not run on a
- >Jan> 68030. And 68040 optimised packages for ultimate performance are
- >Jan> already coming righ now. There is a 68040 optimised version of
- >Jan> Lightwave which is more than 10 times faster running on 28MHz
- >Jan> 68040 card than on a Amiga 3000 (68030 25MHz). Also REAL3D is
- >Jan> coming in 68040 optimised version being currently 8 times quicker
- >Jan> than an Amiga 3000 running it on a 28MHz Fusion-Forty 68040
- >Jan> board.
- >
- >I'm not certain about this, but I'm pretty sure that the 68040 does
- >not change the user programming model of the 680X0 as compared to the
- >68030.
- >
- >I suspect that these new versions of these programs just have 2
- >differences:
- >
- >1) Code ordered to keep the pipeline filled.
-
- Compilers do not do that yet.
-
- >2) Different selection of instructions which increase performance on
- > an '040
-
- Isn't that what I said basically. Instead of taking the 68882 commands
- take the FPU commands that are available with the 68040 and optimise
- loops to fit into the larger cache.
-
- This already results in a dramatic speed increase over the 68030/68882.
-
-
-
- --
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