Faster iterated point doubling for generic A and A == 0 cases #4257
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Improves ECDSA verify and ECDH agreement; on my machine about 11% for Brainpool curves, and 8% for secp256k1.
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Improves ECDSA verify and ECDH agreement; on my machine about 11% for Brainpool curves, and 8% for secp256k1.