[theora-dev] [PATCH]: PPC/Altivec implementations of SAD and SSD

[Venkatesh Srinivas]

Hi,

This patch adds Altivec-optimized implementations of oc_enc_frag_sad and
oc_enc_frag_ssd. This patch is against the latest svn revision of
theora-ptalarbvorm.

Speeds up encode on a plant stop-motion clip on a 1 GHz PPC  7447 by ~3%,
timewise. Time spent in oc_enc_frag_sad is reduced from 4.2% to 2.3% and
oc_enc_frag_ssd from 1.2% to 1.0%, as reported by Shark.

Currently this is only integrated into the Xcode build project and need
support for detecting Altivec on platforms other than OS X; on OS X it uses
the sysctl hw.vectorunit.

Thanks,
-- vs
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