It could be due to branch prediction by the cpu.
Ken Warner wrote:
Yeah, when I integrated it into my bi-cubic interpolator, it slowed it
down compared to the logical check clamp. I'm not sure why yet. Maybe
it was the way I integrated it. I don't know.
In my test suite, the time to interpolate a 944 x 644 image went from
1350ms using the logical test clamp to 1440ms using the triple shift.
I'm not sure why... I work on a real slow (800mhz) machine just so I
can see these kinds of things better.
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