Date: Thu, 23 Sep 1999 08:00:50 -0300 (ADT) From: The Hermit Hacker <scrappy@hub.org> To: freebsd-current@freebsd.org Subject: gcc optimizer in -current system ... Message-ID: <Pine.BSF.4.10.9909230759130.4590-100000@thelab.hub.org>
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just curious, but what is the max setting that can be used to compile the
kernel?
looking through the man page, I can do something like:
-O3 -march=pentium
and, if I'm reading the man page right:
-mcpu=cpu type
Assume the defaults for the machine type CPU TYPE
when scheduling instructions. The choices for CPU
TYPE are: i386, i486, i586 (pentium), pentium, i686
(pentiumpro), and pentiumpro. While picking a spe-
cific CPU TYPE will schedule things appropriately
for that particular chip, the compiler will not
generate any code that does not run on the i386
without the -march=cpu type option being used.
-march=cpu type
Generate instructions for the machine type CPU
TYPE. The choices for CPU TYPE are: i386, i486,
pentium, and pentiumpro. Specifying -march=cpu
type implies -mcpu=cpu type.
it will generate code that wouldn't run on an i386, but is totally
optimized for a pentium?
Marc G. Fournier ICQ#7615664 IRC Nick: Scrappy
Systems Administrator @ hub.org
primary: scrappy@hub.org secondary: scrappy@{freebsd|postgresql}.org
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