Replacing gcd_1 with gcd_11

Niels Möller nisse at
Sun Aug 18 07:44:20 UTC 2019

Do we have all needed gcd_11 so we can switch to using it, without
performance regressions?

Attached patch updates the small-number cases at the end of mpn_gcd.
This code would get simpler if we allowed one even input to gcd_11 and


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