Message-ID: <002001be6821$f9ecae80$0217a8c0@straylight.millennium.rose>
From: "Allan Hsu" <animate2 AT underworld DOT net>
To: <pgcc AT delorie DOT com>
Subject: Re: How well do the -mcpu=amdk6 -march=amdk6 options work
Date: Sat, 6 Mar 1999 17:37:53 -0500
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Reply-To: pgcc AT delorie DOT com

In order to get srpms to compile with different optimizations, you need to
edit/create /etc/rpmrc. I use this line on my pII-300:
optflags: i386 -O6 -march=pentiumpro
btw, I think -march=cpublegh implies -mcpu=cpublegh, so your -mcpu=amdk6 may
be redundant.

            -yt.

-----Original Message-----
From: Steve Bergman <steve AT netplus DOT net>
To: pgcc AT delorie DOT com <pgcc AT delorie DOT com>
Date: Saturday, March 06, 1999 12:25 PM
Subject: How well do the -mcpu=amdk6 -march=amdk6 options work


>Hi,
>
>First of all, Thank You, pgcc/egcs developers.  I appreciate your efforts.
>
>I am a long time amdk6 owner having had a K6/233 and now a K6-2/300 and
about to
>get a K6-3/400-450.  I have tried pgcc off and on for a year or so and have
>always been disappointed by the results I get on my chip.  For example,
today I
>downloaded and compiled egcs-1.1.1/pgcc-1.1.1 and recompiled gzip with it,
using
>-mcpu=amdk6, -march=amdk6.  The result is larger and very slightly *slower*
than
>the stock redhat rpm.  This is about what I have found in past attempts.
Am I
>missing something?  Anyone with K6 optimization ideas need someone to help
test?
>
>Also, what is the best way to lock the compiler into amdk6 optimization.
If I
>can get a speed up, I would like to recompile all the SRPM's in my RH5.2
>distribution with PGCC, but the RPMS all have -m486 build in.  For now, I
have
>hard coded ix86_arch_string and ix86_cpu_string in gcc/config/i386/i386.c
but is
>there a better way?
>
>Thanks for any information or assistance,
>Steve
>
>
>----------
>If this had been a real emergency, we would all have fled in terror,
>and you would not have been notified.
>