+/**
+ * Quickly lookup a precomputed table to return a prime number greater than @x.
+ * Returns zero if there is no such prime (we guarantee the existance of at
+ * least one prime greater than `1U << 31` in the table).
+ **/
+uint next_table_prime(uint x);
+
+/**
+ * Quickly lookup a precomputed table to return a prime number smaller than @x.
+ * Returns zero if @x is smaller than `7`.
+ **/
+uint prev_table_prime(uint x);