rte_branch_prediction.h 文件参考

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浏览源代码.

宏定义
#define	likely(x)   __builtin_expect(!!(x), 1)
#define	unlikely(x)   __builtin_expect(!!(x), 0)

详细描述

Branch Prediction Helpers in RTE

宏定义说明

likely

#define likely

(

x

)

__builtin_expect(!!(x), 1)

Check if a branch is likely to be taken.

This compiler builtin allows the developer to indicate if a branch is likely to be taken. Example:

if (likely(x > 1)) do_stuff();

unlikely

#define unlikely

(

x

)

__builtin_expect(!!(x), 0)

Check if a branch is unlikely to be taken.

This compiler builtin allows the developer to indicate if a branch is unlikely to be taken. Example:

if (unlikely(x < 1)) do_stuff();