9b53853756
This removes a branch at a performance-sensitive point (in the middle of the loop). In fate-swr-resample-s32p-8000-2626, this makes the code about 10% faster. It also simplifies the loops, allowing us to rewrite it in yasm at some later point. The compensation_distance != 0 code and index < 0 code are still kind of hairy. For compensation_distance != 0, this should likely be handled in the caller, so that it calls swri_resample twice (once until the dst_incr switch-point, and once with the remainder of the samples). For index < 0, the code should probably be rewritten to break out of the loop once sample_index >= 0, and then resume (e.g. as a tail-call) to the common or linear resampling loops. Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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