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On 31/12/14 12:03 AM, xunxun wrote:
> I noticed that kissfft has a configure option called USE_SIMD, and
> the related libopus also has the USE_SIMD, but Mozilla has not
> enabled it. Did the option enabled have some defects? Maybe that
> has some speed improvement.
USE_SIMD is some leftover from the original kissfft that was heavily
modified. It allowed to use SIMD to compute *multiple* FFTs at the
same time, which is not what Opus does. I suspect that defining
USE_SIMD on the current code would either do nothing or cause a
compile error. Bottom line is do not define it and the remaining
references to it should probably be deleted.
Jean-Marc
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