bitcoin/secp256k1 — pull request #177 by gmaxwell (2014-12-31 13:59:27+00:00)
Title: Use secp256k1_fe_equal_var in secp256k1_fe_sqrt_var.

In theory this should be faster, since secp256k1_fe_equal_var is able to
shortcut the normalization. On x86_64 the improvement appears to be in
the noise for me. At least it makes the code cleaner.