Cached hash calculation for paddings #25
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This PR cached results for pow_5 and mds multiple while calculating the hash entry
(0, 0). This entry is used for padding and would be heavily used. By caching the result, we could save some cost in synthesis, in which the witness generation process involves hash calculation.The benchmark for a 99.8% (499/500) padding calculation show improvment from 174 -> 160ms in
MockProver::runcalling. We usecargo bench --features short --no-default-featuresfor the benchmark without caching of results.