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add SSE2 functions. ~2x faster encoding on average.

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For now, SSE2 functions are compiled a-minima: only on platforms
where __SSE2__ is defined. Let's later add some autoconf-based
config to enable/disable at will.

One can disable SSE2 at run-time by hooking-up VP8GetInfo.
There is a new option "-noasm" in cwebp for that.
Output should be binary the same between C and SSE2 version. If not,
that's a bug!

patch by Christian Duvivier (cduvivier at google dot com)

Change-Id: Iae006c3cdcb7e8280e846cedb94d239dab1e42ae
This commit is contained in:
Pascal Massimino
2011-04-22 12:14:45 -07:00
parent e7ff3f9af6
commit cfbf88a6c4
7 changed files with 680 additions and 31 deletions
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man/cwebp.1
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@ -118,6 +118,9 @@ range from 1 to 6. This is only meant to help debugging.
Specify a pre-processing filter. This option is a placeholder
and has currently no effect.
.TP
.B \-noasm
Disable all assembly optimizations.
.TP
.B \-v
Print extra information (encoding time in particular).
.TP