DCT routines rewritten to C. Speedup differs for each dct version and it is more prominent for the single precision data.
Tested for array of length 1048576
dcti - no speedup,
dctii - 3x speedup for single, 2x for double
dctiii - 4x speedup for single, 2x for double
dctiv - 6x speedup for single and double
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