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[f-cpu] SIMD register



After reading a idct MMX code i don't think it really easy to use simd
register without knowing there size. Such idct use 8 word chunk because
it fill the right data.

A study on theoretical cpu on a new and simple algorythme of compiling
to use vector instruction on spec program give it's maximum around
128-256 bits register (4*64 bits float). With bigger register inter
register dependancies increase and code speed DECREASE.

So size independant code will slow done even more the code.

nicO

 
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