for (__attribute__((cleanup(_reset_umask_))) struct umask_struct _saved_umask_ = { umask(mask), false }; \
!_saved_umask_.quit ; \
_saved_umask_.quit = true)
+
+static inline unsigned u64log2(uint64_t n) {
+ return (n > 1) ? __builtin_clzll(n) ^ 63U : 0;
+}