diff options
| author | Miles Bader <miles@lsi.nec.co.jp> | 2002-08-30 05:14:26 +0000 |
|---|---|---|
| committer | Miles Bader <miles@lsi.nec.co.jp> | 2002-08-30 05:14:26 +0000 |
| commit | 0f66c96633b67370be9c490491f993c29536a4d7 (patch) | |
| tree | 8f381b8e807cace05d2b550f221d46841e088d07 /libc/stdlib/malloc | |
| parent | 8879afda8b95340b8e2263e4862d02bfe6aa54f1 (diff) | |
(likely, unlikely): New macros.
Diffstat (limited to 'libc/stdlib/malloc')
| -rw-r--r-- | libc/stdlib/malloc/heap.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/libc/stdlib/malloc/heap.h b/libc/stdlib/malloc/heap.h index 38451f091..da63b4341 100644 --- a/libc/stdlib/malloc/heap.h +++ b/libc/stdlib/malloc/heap.h @@ -68,6 +68,18 @@ struct heap_free_area HEAP_ADJUST_SIZE (sizeof (struct heap_free_area) + 32) +/* branch-prediction macros; they may already be defined by libc. */ +#ifndef likely +#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96) +#define likely(cond) __builtin_expect(!!(int)(cond), 1) +#define unlikely(cond) __builtin_expect((int)(cond), 0) +#else +#define likely(cond) (cond) +#define unlikely(cond) (cond) +#endif +#endif /* !likely */ + + /* Define HEAP_DEBUGGING to cause the heap routines to emit debugging info to stderr. */ #ifdef HEAP_DEBUGGING |