Hi, On Wed, Jul 6, 2011 at 4:08 PM, Ronald S. Bultje <[email protected]> wrote: > I believe the reason this exists is so that we duplicate the code, and > shifting becomes a constant in the code, rather then a variable to be > loaded into cl. This leaves cl free for others and lead to somewhat of > a speedup.
Actually, it may not be the shift alone, but also the fact that the shift is completely not there for the 8bit version. So it's actually the 8bit version that gets significantly faster with this, the 10bit maybe not so much (or just a little bit, at best, because cl is not clobbered). Ronald _______________________________________________ libav-devel mailing list [email protected] https://lists.libav.org/mailman/listinfo/libav-devel
