util: add u32ctz() call for determining ctz of uint32_t

2014-01-30 16:47:18 +01:00
parent 50add2909c
commit ec417ccc27
1 changed files with 12 additions and 0 deletions
@@ -743,7 +743,19 @@ static inline void _reset_umask_(struct _umask_struct_ *s) {
             _saved_umask_.quit = true)

 static inline unsigned u64log2(uint64_t n) {
+#if __SIZEOF_LONG_LONG__ == 8
        return (n > 1) ? (unsigned) __builtin_clzll(n) ^ 63U : 0;
+#else
+#error "Wut?"
+#endif
+}
+
+static inline unsigned u32ctz(uint32_t n) {
+#if __SIZEOF_INT__ == 4
+        return __builtin_ctz(n);
+#else
+#error "Wut?"
+#endif
 }

 static inline bool logind_running(void) {