std.crypto.pcurves.*: simpler, smaller, faster u64 addition with carry (#19644)

signature/s:

Algorithm        Before     After
---------------+---------+-------
ecdsa-p256        3707       4396
ecdsa-p384        1067       1332
ecdsa-secp256k1   4490       5147

Add ECDSA to the benchmark by the way.
e45bdc6bd6Frank Denis committed on 4/13/2024, 11:13:22 PM· committed by GitHubparenta59ad71
7 files changedLine totals unavailable