On Fri, 4 Jan 2002, greg wright wrote: > I just did this too, MMX only though. How many cycles/pixel did you > end up with? What percentage of pairing did you achieve? Note that only P5-core chips care about pairing, per-se. There are much nastier issues involved in modern P6 cores. I haven't thought about them for quite a while, so it'd take me a while to dig out the stuff and put it back into main memory, but I think I have a pretty good understanding of how the P6 really works...
> there are plenty of samples of this on Intel's site. Unfortunately that just isn't very useful outside Intel's world. There are about a half-dozen manufacturers of x86 chips that matter, and they all have all sortsof bizarre quirks. I ran across a sourceforge project a few days ago (x86info I think) that tries to deal with that, but I didn't look at the code. There's a larger issue when it comes to other architectures. There are similar but in some cases nastier problems on things like PPC and Alpha. This is why I want to gather all this into a single library. It would go closely with my other projects, SpeciaLib and libcodec, which focus on run-time specialization of time-critical kernels, such as the motion-compensation code in an MPEG decoder, or color-space conversion/transliterations, etc. (as in the 4:2:0 to 4:2:2 problem). You can see a lot of this stuff at http://codecs.org/, though specialib itself isn't there because it's not anywhere near formed enough for CVS. Erik Walthinsen <[EMAIL PROTECTED]> - System Administrator __ / \ GStreamer - The only way to stream! | | M E G A ***** http://gstreamer.net/ ***** _\ /_ _______________________________________________ Xpert mailing list [EMAIL PROTECTED] http://XFree86.Org/mailman/listinfo/xpert
