mpn_sec_minvert name

[Niels Möller]

Torbjorn Granlund <tg at gmplib.org> writes:

> My change to mpn_sec_invert is pending on your sec changes.

I've now added sec_add_1 and sec_sub_1 (which I think are of some
importantance for applications).

I doubt I will have the needed time and energy for proper testing of
assembly cnd_swap and cnd_neg before release, so don't wait for that.

Also mpn_sec_sub_1, trivial as it looks, is currently untested. I guess
it should be fairly easy to add tests for both new functions to
tests/mpn/t-aors_1.c.

Regards,
/Niels

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