func golang.org/x/crypto/argon2.phi

2 uses

	golang.org/x/crypto/argon2 (current package)
		argon2.go#L275: 	return phi(rand, uint64(m), uint64(s), refLane, lanes)
		argon2.go#L278: func phi(rand, m, s uint64, lane, lanes uint32) uint32 {