> Date: Sun, 28 Feb 2010 22:37:27 +0800
> From: Aaron Lewis <aaron.lewis1...@gmail.com>
> Subject: Re: Compiler Flags problem with core2 CPU
> To: Paul B Mahol <one...@gmail.com>
> Cc: freebsd-questions@freebsd.org
> Message-ID: <4b8a7fa7.1070...@gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1;
> format=flowed
>
> Really ? It's bad to use custom flags to compile kernel ,
> why do you
> think so ?
> I'd like to know more about this : )
>
> So setting optimize compiler flags is only useful for
> userland stuff ?
>
I laughed at your question because I remember reading somewhere that using
aggressive optimization options is a good way to find compiler bugs. I think
that extends of optimizations for "new" CPU architectures as well.
I also heard kernel code avoids MMX instructions for some reason: it may have
to do with interrupt handling (fewer registers=faster?). x86 (and AMD64)
processors are backwards compatible, so you don't strictly need the latest
instructions.
Regards,
James Phillips
__________________________________________________________________
The new Internet Explorer® 8 - Faster, safer, easier. Optimized for Yahoo!
Get it Now for Free! at http://downloads.yahoo.com/ca/internetexplorer/
_______________________________________________
freebsd-questions@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-questions
To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
