I updated the first post with a table of timings and some analysis for a generic 900-bit input, and a couple different Mersenne inputs.
It looks like a hybrid plan is best for most B1 levels.
The relative speeds of avx-ecm and gmp-ecm should be checked on the particular cpu beforehand, and crossovers adjusted.
Last fiddled with by bsquared on 2020-11-03 at 19:50
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