Likely and Unlikely in linux

最新推荐文章于 2025-09-16 23:35:15 发布

转载最新推荐文章于 2025-09-16 23:35:15 发布 · 827 阅读

文章标签：

#内存分配 #Linux #内核 #C

本文详细介绍了Linux编程中likely和unlikely宏的作用及其内部实现原理。这两种宏用于指导编译器进行分支预测，通过调整指令顺序来提高程序运行效率。

在linux中判断语句经常会看到likely和unlikely，例如：

if(likely(value)){

}

else{

}

简单从表面上看if(likely(value)) == if(value)，if(unlikely(value)) == if(value)。

也就是likely和unlikely是一样的，但是实际上执行是不同的，加likely的意识是value的值为真的可能

性更大一些，那么执行if的机会大，而unlikely表示value的值为假的可能性大一些，执行else机会大一些。

加上这种修饰，编译成二进制代码时likely使得if后面的执行语句紧跟着前面的程序，unlikely使得else后

面的语句紧跟着前面的程序，这样就会被cache预读取，增加程序的执行速度，likely和unlikely的实现在

include/linux/compiler.h中：

      9 #if __GNUC__ == 2 && __GNUC_MINOR__ < 96
     10 #define __builtin_expect(x, expected_value) (x)
     11 #endif
     12
     13 #define likely(x)   __builtin_expect((x),1)
     14 #define unlikely(x) __builtin_expect((x),0)

__builtin_expect是gcc的一个预处理命令，其解释如下：

long __builtin_expect (long exp, long c)
You may use __builtin_expect to provide the compiler with branch prediction
information. In general, you should prefer to use actual profile feedback for this

(‘-fprofile-arcs’), as programmers are notoriously bad at predicting how their
programs actually perform. However, there are applications in which this data is
hard to collect.
The return value is the value of exp, which should be an integral expression. The
value of c must be a compile-time constant. The semantics of the built-in are that it
is expected that exp == c. For example:
if (__builtin_expect (x, 0))
foo ();
would indicate that we do not expect to call foo, since we expect x to be zero. Since
you are limited to integral expressions for exp, you should use constructions such as
if (__builtin_expect (ptr != NULL, 1))
error ();
when testing pointer or floating-point values.