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| Date: | Fri, 18 Feb 2000 13:05:54 +0100 |
| From: | Marc Lehmann <marc AT gimp DOT org> |
| To: | pgcc AT delorie DOT com |
| Cc: | law AT sgi DOT com |
| Subject: | Re: Big slowdown on -mpentium/-mpentiumpro, short_int add |
| Message-ID: | <20000218130553.C1399@cerebro.laendle> |
| Mail-Followup-To: | pgcc AT delorie DOT com, law AT sgi DOT com |
| References: | <38AC20C0 DOT 55E33FA4 AT sgi DOT com> |
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| In-Reply-To: | <38AC20C0.55E33FA4@sgi.com>; from law@sgi.com on Thu, Feb 17, 2000 at 08:24:32AM -0800 |
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On Thu, Feb 17, 2000 at 08:24:32AM -0800, Linda Walsh <law AT sgi DOT com> wrote:
> Showed about a 30-40% slowdown when using the -mpentium or -mpentiumpro
on which cpu, and slowdown compared to what?
> Note the test suite is copyright, but I'm excerpting this section for
> educational (to demonatrate a problem) purposes.
Das that make it more legal ;) Anyway, thanks a lot for the snippet!
I do not know the reason for the slowdown (yet), but "short" is about
the slowest datatype for pentium-type systems, and it could very well be
that suboptimal scheduling even of a single insns can make such a large
difference.
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