/*----- Some useful constants ---------------------------------------------*/
-#define B31 0x80000000 /* just bit 31 */
-#define B30 0x40000000 /* just bit 30 */
+#define B31 0x80000000u /* just bit 31 */
+#define B30 0x40000000u /* just bit 30 */
#define SH32 4294967296.0 /* 2^32 as floating-point */