Sender: root AT squid DOT netplus DOT net
Message-ID: <36E48B4C.86B84AD1@netplus.net>
Date: Mon, 08 Mar 1999 20:45:32 -0600
From: Steve Bergman <steve AT netplus DOT net>
X-Mailer: Mozilla 4.07 [en] (X11; I; Linux 2.2.2 i586)
MIME-Version: 1.0
To: "pgcc AT delorie DOT com" <pgcc AT delorie DOT com>
Subject: Optimizations questions
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Reply-To: pgcc AT delorie DOT com

I'm getting ready to recompile my RH5.2 system and 2.2.2 kernel.  I have an
AMDK6-2/300.  Would "-O6 -march=amdk6 -mcpu=amdk6" be reasonable options to set
in rpmrc?  What is the status of "-fstrength-reduce" and "-funroll-all-loops"
these days?  Are they stable enough to compile my whole system with?  Also, I'm
a bit unclear about the optimizations table in the faq.  When an option is
marked "U" but is shown to be invoked at, say, level -O4, what does that mean? 
At the top of the table it says it "must be explicitly enabled in its -foption
form".  Does that mean that you have to specify both -O4 and -foption to use
that optimization?  It seems a bit ambiguous.

I should add that this system is my own home system, and although I do most of
my work on it, it is not a "critical production system" by any means.  I can
afford to be at least a bit adventuresome, in the interest of performance and
testing. (At home, no one can here you scream...  ;-)  )

Thanks for any info,
Steve
-- 

----------
If this had been a real emergency, we would all have fled in terror, 
and you would not have been notified.