Denis Serenyi writes: > 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? >
As David says, have a look at http://kobe1995.net/~kaz/FreeBSD/SSE.en.html There is a patch there for 4.3. What are the performance implications to an SSE bcopy? How much faster is it than a normal bcopy? Would you consider releasing your code under a BSD license so that others could play with it, and possibly integrate it (or something based on it) into FreeBSD? Thanks, Drew To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-hackers" in the body of the message
