Date: Wed, 03 Mar 2010 00:03:36 +0800 From: Aaron Lewis <aaron.lewis1989@gmail.com> To: freebsd-questions@freebsd.org Subject: [SOLVED] Compiler Flags problem with core2 CPU Message-ID: <4B8D36D8.8070303@gmail.com> In-Reply-To: <997836.8570.qm@web65512.mail.ac4.yahoo.com> References: <997836.8570.qm@web65512.mail.ac4.yahoo.com>
next in thread | previous in thread | raw e-mail | index | archive | help
James Phillips wrote: > 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 Ah , i've just read it may not be safe to use MMX and SSE instructions in kernel code. So my CFLAGS is much too agressive , i'll notice this. Thank you all. -- Best Regards, Aaron Lewis - PGP: 0xA476D2E9 irc: A4r0n on freenode
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?4B8D36D8.8070303>