在知道哪个发生概率更高的情况下,有if时使用likely和unlikely让代码运行更快。 likely和unlikely是两个宏,当有if-else分支时告诉编译器,哪个条件更加有可能发生。likely代表if分支大概率会发生,unlikely代表if分支大概率不会发生。 #definelikely(x) __builtin_expect(!!(x), 1) #defineunlikely(x) __builtin_...
1.likely和unlikely 这是两个宏,当有if-else分支时,告诉编译器,哪个条件更加有可能发生。对if-else分支结构进行优化。likely代表if分支大概率会发生,unlikely代表if分支大概率不会发生。 #define likely(x) __builtin_expect(!!(x), 1) #define unlikely(x) __builtin_expect(!!(x), 0) 1. 2. __bui...
if( !!fun1() != !!fun2() ) printf("success");“!!” 可以将条件转换为 bool 值,下面这两种写法是等价的: b = cond?1:0;// 等价于b = !!cond;likely 与 unlikely 宏的实例 现在我们一起看一下 likely 与 unlikely 宏的作用,写出C语言代码如下,请看: #define likely(x) (__builtin_expec...
unlikely.cpp: 1#include<stdio.h>2#include<stdlib.h>34#definelikely(x) __builtin_expect(!!(x), 1)//gcc内置函数, 帮助编译器分支优化5#defineunlikely(x) __builtin_expect(!!(x), 0)67intmain(intargc,char*argv[]){8intx =0;9x = atoi(argv[1]);1011if(unlikely(x ==3)){//告诉...
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C.opportunityD.likely 解析:opportunity多指特殊的机会,含有特殊的意味。 W.语法填空 阅读下面材料,在空白处填入适当内容(1个单词)或括号内单词的正确形式。 In the 1.___(develop) countries of the world, especially in China, air pollution especially 2.___—(get) more and more serious.In Beijing, ...
if(((x-minx)|(maxx-x))>=0)...如果语言警察们担心有符号整数回环是未定义行为的话，可以写成...
note: This error originates from a subprocess, and is likely not a problem with pip. ERROR: Failed building wheel for llama-cpp-python Failed to build llama-cpp-python ERROR: Could not build wheels for llama-cpp-python, which is required to install pyproject.toml-based projects ...
英[ˈkrɪtɪkl] 美[ˈkrɪtɪkl] 释义 常用 高考讲解 adj. 关键的;(病情或局势)严重的;批评的;评论家的;评判性的 词态变化 副词:critically; 实用场景例句 全部 批评的 关键的 严重的 acriticalmoment in our country's history 我国历史上的危急关头 ...