[MPlayer-dev-eng] [PATCH] vf_ass: avoid a division
greg at chown.ath.cx
Thu Sep 16 10:47:50 CEST 2010
On 09/16/2010 10:46 AM, Siarhei Siamashka wrote:
> On Thu, Sep 16, 2010 at 11:21 AM, Grigori Goronzy <greg at chown.ath.cx> wrote:
>> Instead of "x / 255" at all it's usually faster to do "(x + 255) >> 8",
>> at least in my experience. You can easily transform all divisions to
>> shifts in this inner loop. Haven't done any tests, though.
> I suggest checking this link for the bit-exact division-free implementation:
Interesting, but do we need bit-exact results here? I think no.
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