bitcoin/secp256k1 — pull request #168 by sipa (2014-12-17 11:46:40+00:00)
Title: Remove GMP field implementation

The GMP field implementation is has no constant-time guarantees, so shouldn't be used for production code. In addition, it is hard to optimize for, as it uses a different bounds/normalization pattern. Also, if it is autoselected you end up with an extra dependency.

If we want a reference field implementation, I'm sure a more readable plain-C one is possible (with horrible performance).