Il 2022-09-01 17:04 Torbjörn Granlund ha scritto:
/* FIXME: Using mpz_invert is cheating. Instead, first compute m' =
m^-1 (mod 2^k) via Newton/Hensel. We can then get the inverse
via
2^{-k} (mod m) = (2^k - m') * m + 1)/2^k. */
mpz_invert (t, t, m);
mpn_copyi (info->ip, mpz_limbs_read (t), mpz_size (t));
You might want to use mpn_binvert here.
We should start writing mpn_sec_binvert :-)
Or use the current mpn_sec_invert for the precomputation.
Ĝis,
m
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