4、X86 - 64 核心编程：位运算、移位运算与 64 位整数运算

X86 - 64 核心编程：位运算、移位运算与 64 位整数运算

1. 位逻辑运算

位逻辑运算在计算机编程中非常重要，它可以对二进制位进行操作。下面通过示例代码来详细介绍位逻辑运算的使用。

1.1 C++ 代码示例

// Ch02_02.h
#pragma once
// Ch02_02_fasm.asm, Ch02_02_fasm.s
extern "C" unsigned int BitOpsU32_a(unsigned int a, unsigned int b,
    unsigned int c, unsigned int d);
// Ch02_02_fcpp.cpp
unsigned int BitOpsU32_cpp(unsigned int a, unsigned int b, unsigned int c,
    unsigned int d);
// Ch02_02_misc.cpp
extern void DisplayResults(unsigned int a, unsigned int b, unsigned int c,
    unsigned int d, unsigned int r1, unsigned int r2);

// Ch02_02_fcpp.cpp
#include "Ch02_02.h"
unsigned int BitOpsU32_cpp(unsigned int a, unsigned int b, unsigned int c,
    unsigned int d)
{
    // Calculate ~(((a & b) | c ) ^ d)