[x264-devel] [PATCH] faster mc_chroma_altivec

[maaanuuu at gmx.net]

Hello,

the attached patch improves mc_chroma_altivec:

Now VEC_LOAD is used instead of VEC_LOAD_G, vec_mladd is used more  
efficient and the loop is unrolled 2x.
mc_chroma_w4_altivec now needs dst to be aligned to a 4 byte boundary,  
is that OK?
Finally, I put width == 2 into its own function because at the moment  
the code that is used for it is actually slower than plain C.

The patch passes checkasm and leads to a 2-3% performance gain overall  
using the default settings. Please note that I have NOT done extensive  
regression tests.
Comments and suggestions are welcome :)


Manuel



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