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doc/optimization.txt
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As many functions tend to be a bit difficult to understand because
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of optimizations, it can be hard to optimize them further, or write
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architecture-specific versions. It is recommened to look at older
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architecture-specific versions. It is recommended to look at older
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revisions of the interesting files (for a web frontend try ViewVC at
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http://svn.mplayerhq.hu/ffmpeg/trunk/).
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Alternatively, look into the other architecture-specific versions in
......
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WTF is that function good for ....:
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-----------------------------------
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The primary purpose of that list is to avoid wasting time to optimize functions
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which are rarely used
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The primary purpose of this list is to avoid wasting time optimizing functions
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which are rarely used.
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put(_no_rnd)_pixels{,_x2,_y2,_xy2}
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    Used in motion compensation (en/decoding).
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        ...
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}while()
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Use asm() instead of intrinsics. Later requires a good optimizing compiler
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Use asm() instead of intrinsics. The latter requires a good optimizing compiler
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which gcc is not.
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