rv40dsp: implement prescaled versions for biweight.
authorChristophe GISQUET <christophe.gisquet@gmail.com>
Mon, 19 Mar 2012 21:46:28 +0000 (22:46 +0100)
committerRonald S. Bultje <rsbultje@gmail.com>
Tue, 10 Apr 2012 17:06:48 +0000 (10:06 -0700)
Quite often, the original weights are multiple of 512. By prescaling them
by 1/512 when they are computed (once per frame), no intermediate shifting
is needed, and no prescaling on each call either.

The x86 code already used that trick.

Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>

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