clarify previous revision on optimization justification
Originally committed as revision 11598 to svn://svn.ffmpeg.org/ffmpeg/trunk
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@ -30,15 +30,15 @@ NOTE: If you still don't understand some function, ask at our mailing list!!!
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When is an optimization justified?
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----------------------------------
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Normally, clean & simple optimizations on widely used codecs can achieve
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an overall speedup of 0.1%. These speedups accumulate and can make a big
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difference after awhile. Also, if none of the following factors get
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worse due to an optimization -- speed, binary code size, source size,
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source readability -- and at least one factor improves, then an
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optimization is always a good idea even if the overall gain is less than
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0.1%. For obscure codecs that are not often used, the goal is more
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toward keeping the code clean, small, and readable than to make it 1%
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faster.
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Normally, clean and simple optimizations for widely used codecs are
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justified even if they only achieve an overall speedup of 0.1%. These
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speedups accumulate and can make a big difference after awhile. Also, if
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none of the following factors get worse due to an optimization -- speed,
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binary code size, source size, source readability -- and at least one
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factor improves, then an optimization is always a good idea even if the
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overall gain is less than 0.1%. For obscure codecs that are not often
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used, the goal is more toward keeping the code clean, small, and
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readable instead of making it 1% faster.
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WTF is that function good for ....:
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