Date: Fri, 4 Sep 2009 00:10:54 -0500 (CDT) From: Scott Bennett <bennett@cs.niu.edu> To: dmw@coder.cl Cc: freebsd-questions@freebsd.org Subject: Re: cc -march questions Message-ID: <200909040510.n845AsPU024402@mp.cs.niu.edu>
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On Thu, 3 Sep 2009 10:28:09 -0400 Daniel Molina Wegener <dmw@coder.cl>
wrote:
>2009/9/3 Scott Bennett <bennett@cs.niu.edu>
>
>> What exactly does "cc -march=prescott" enable cc to do? Does it
>> include
>> instruction scheduling for the pipeline structure of the Prescott CPUs?
>> Does
>> it include other options, e.g., "-mmmx -msse -msse2 -msse3"?
>> Thanks in advance for any information on the above!
>>
>
>According to the GCC manual page, it enables MMX, SSE, SSE2 and SSE3
>instruction set support.
>
>Try:
>$ man 1 gcc
>/prescott
>
Thanks much for your reply. This is very bizarre. I think I've looked
at that page at least 50 times in the past few years and somehow never saw
those lines. Sigh. :-}
I've had CPUTYPE=prescott in my /etc/make.conf for a long time now,
and I recently installed math/atlas-devel. I wonder if specifying
CPUTYPE=prescott may have caused it to choose the wrong components to
include in the final version of libalapack. If so, then I should rebuild
it without CPUTYPE=prescott.
Scott Bennett, Comm. ASMELG, CFIAG
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