update name of code to labcodes

labcodes/lab5/libs/hash.c

@@ -0,0 +1,18 @@
+#include <stdlib.h>
+
+/* 2^31 + 2^29 - 2^25 + 2^22 - 2^19 - 2^16 + 1 */
+#define GOLDEN_RATIO_PRIME_32       0x9e370001UL
+
+/* *
+ * hash32 - generate a hash value in the range [0, 2^@bits - 1]
+ * @val:    the input value
+ * @bits:   the number of bits in a return value
+ *
+ * High bits are more random, so we use them.
+ * */
+uint32_t
+hash32(uint32_t val, unsigned int bits) {
+    uint32_t hash = val * GOLDEN_RATIO_PRIME_32;
+    return (hash >> (32 - bits));
+}
+