From 39f8becdef728a0f24b42ce17372cbda8dda2bde Mon Sep 17 00:00:00 2001 From: Andres Freund Date: Sun, 3 Jul 2016 15:05:18 -0700 Subject: [PATCH 02/20] WIP: Add likely/unlikely() macros. --- src/include/c.h | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/src/include/c.h b/src/include/c.h index 4ab3f80..182066d 100644 --- a/src/include/c.h +++ b/src/include/c.h @@ -939,6 +939,15 @@ typedef NameData *Name; #endif +#ifdef __GNUC__ +#define likely(x) __builtin_expect(!!(x), 1) +#define unlikely(x) __builtin_expect(!!(x), 0) +#else +#define likely(x) !!(x) +#define unlikely(x) !!(x) +#endif + + /* ---------------------------------------------------------------- * Section 8: random stuff * ---------------------------------------------------------------- -- 2.8.1