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| author | Cristian Rodríguez <crrodriguez@opensuse.org> | 2013-04-04 20:09:50 -0300 |
|---|---|---|
| committer | Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl> | 2013-04-05 00:17:35 -0400 |
| commit | 144e51eca20b72c8177314c225d8c15c1b0b9d6b (patch) | |
| tree | e7cbe68e619a5cae506318edc7489469c61451fe /src/shared/util.h | |
| parent | e8853816bf197afc71819e28f1316a5d5ee4b4c3 (diff) | |
journal: u64log2 can be expressed just as __builtin_clzll(n) ^ 63U
Diffstat (limited to 'src/shared/util.h')
| -rw-r--r-- | src/shared/util.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/shared/util.h b/src/shared/util.h index 69a47653aa..7c3da08dd8 100644 --- a/src/shared/util.h +++ b/src/shared/util.h @@ -635,3 +635,7 @@ static inline void _reset_umask_(struct umask_struct *s) { 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; +} |