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From: Mikhail Teterin <mi@corbulon.video-collage.com>
Message-Id: <200301092255.h09MtfHY025902@corbulon.video-collage.com>
Subject: Re: cvs commit: src/sys/i386/i386 mp_machdep.c
In-Reply-To: <15901.64772.844070.407901@grasshopper.cs.duke.edu>
To: Andrew Gallatin <gallatin@cs.duke.edu>
Date: Thu, 9 Jan 2003 17:55:41 -0500 (EST)
Cc: Mikhail Teterin <mi+mx@aldan.algebra.com>,
	Alexander Leidinger <Alexander@Leidinger.net>, cvs-all@FreeBSD.ORG,
	cvs-committers@FreeBSD.ORG, marius@alchemy.franken.de
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> Mikhail Teterin writes:
>  > You may wish to take a look at
>  > 
>  > 	http://www.FreeBSD.org/cgi/query-pr.cgi?pr=bin/43299
>  > 
>  > Especially, the follow up to it, where using SSE2 appears to slow things
>  > down -- at least for double values.
>  > 
>  > 	-mi
 
> Strange. The intel compiler is slower too. But at least it gets the
> right answer, which is more than gcc can do (unless O0 is used)

As I note in my follow up, gcc now gives the right answer too on my
system. I suspect -- thanks to the commit I quote there. How recent is
your system?

> icc  -O3 -tpp7 -xW:  (P4)
> 
> 2^2.1 is 4.28709
> 11^-2.1 is 0.00650243
>         5.77 real         5.68 user         0.02 sys
> 
> 
> icc  -O3 -tpp6 -xK:  (PIII)
> 
> 2^2.1 is 4.28709
> 11^-2.1 is 0.00650243
>         5.38 real         5.13 user         0.00 sys
> 
> gcc -O3 -march=pentium4
 
> 2^2.1 is 0.5
> 11^-2.1 is 0.0909091
>         0.63 real         0.62 user         0.00 sys

Yep, this lighting speed and incorrectness is what I was seeing, when
I submitted the PR.
 
> gcc -O3 -march=pentium3
> 
> 2^2.1 is 4.28709
> 11^-2.1 is 0.00650243
>         6.68 real         6.50 user         0.01 sys
 
> I still build my system with CPUTYPE=p3, so I think my libs are OK.

My example in there explicitly avoids using -lm anyway :-)

	-mi

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