"math/bits" ) const ( // _W is the size in bits of our limbs. _W = bits.UintSize // _S is the size in bytes of our limbs. _S = _W / 8 ) // Note: These functions make many loops over all the words in a Nat. // These loops used to be in assembly, invisible to -race, -asan, and -msan, // but now they are in Go and incur significant overhead in those modes. // To bring the old performance back, we mark all functions that loop // over Nat words with //go:norace. Because //go:norace does not // propagate across inlining,...