On Wed, Mar 11, 2009 at 11:59 AM, Christian Packmann
<Christian.Packmann@xxxxxx <mailto:Christian.Packmann@xxxxxx>> wrote:
So we can do
(component_value * 129) >> 23
to approximate the division by 65025.
I'll prefix this by saying I know only slightly more than nothing about
MMX and SSE. But I do notice:
(x * 129) >> 23 == (x >> 16) + (x >> 23)
That's just by definition, of course. Is that faster at all? (One more
bit of accuracy could be eked out by adding x >> 31, but that's probably
overkill.)
