[Pixman] [PATCH] Drop support for 8-bit precision in bilinear filtering

Matt Turner mattst88 at gmail.com
Wed Sep 4 23:52:51 PDT 2013

On Wed, Sep 4, 2013 at 7:49 PM, Søren Sandmann <sandmann at cs.au.dk> wrote:
> From: Søren Sandmann Pedersen <ssp at redhat.com>
> The default has been 7-bit for a while now, and the quality
> improvement with 8-bit precision is not enough to justify keeping the
> code around as a compile-time option.
> ---

I'm fine with this change, but just a strange data point, since the
purpose in 7-bit was to be able to use _mm_madd_pi16 or similar:

I noticed that for commit 9aa8e3a2 that I actually had a slight loss
of performance on Loongson (1.8%) but a gain of 8.3% on ARM/iwMMXt.

More information about the Pixman mailing list