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Common: Add likely() and unlikely() macros to hint likeliness of taking a branch.

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The compiled can use these hints to generate the code closer or further
from the entry point depending on likeliness of taking a branch, this
helps when entering the function without prior branch prediction, and
on CPUs without proper branch prediction.
This commit is contained in:
Emmanuel Gil Peyrot 2016-09-11 13:07:54 +09:00
parent 722af0703e
commit d909f18195
1 changed files with 8 additions and 0 deletions
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8
src/common/common_funcs.h
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@ -29,6 +29,14 @@
#define FORCE_INLINE inline __attribute__((always_inline)) #define FORCE_INLINE inline __attribute__((always_inline))
#endif #endif
#if defined(__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
#ifndef _MSC_VER #ifndef _MSC_VER
#ifdef ARCHITECTURE_x86_64 #ifdef ARCHITECTURE_x86_64