Date: Wed, 10 Apr 2002 15:24:20 -0700 From: Denis Serenyi <dserenyi@panasas.com> To: freebsd-hackers@freebsd.org Cc: dserenyi@panasas.com Subject: SSE bcopy Message-ID: <B3B2200B-4CD1-11D6-9B98-003065675568@panasas.com>
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I've been looking at adding an SSE bcopy that runs at user-level to a program that I'm working on. I'm using FreeBSD 4.3 currently. I wrote the routine, and when I execute it, I get an illegal instruction exception when I try to execute the first SSE instruction (movups). After searching the hackers archives, I'm guessing that this is because FreeBSD 4.3 does not execute the instructions at boot time to enable SSE instructions to be executed, and also because FreeBSD 4.3 does not save the 128-bit SIMD registers on context switches. Am I correct in this assessment? It also seems like this support has been added to FreeBSD 4.5. Is this correct? Assuming yes, in what release was SSE support added to FreeBSD? Has anyone done a patch that can be applied to FreeBSD 4.3, or are the changes non-trivial? (considering that the machine-specific part of the context switch code is affected, I'd imagine the answer is that it is non trivial!). please respond directly to me as I'm not on the mailing list. Thanks! To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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