bitcoin/secp256k1 — pull request #59 by sipa (2014-09-07 15:37:20+00:00)
Title: Add ladder implementation for inverses modulo the curve order

Not meant for merging, as there is no way to make the tests run this code yet (I've tested it locally, though).

This slows down the benchmark (no endomorphism, GMP bignum, 64bit_asm field) by 37%, but removes the need for a secp256k1_num_mod_inverse function.