常用C内联汇编获取cpuid代码(支持MSVC，gcc等)

#include <cpuid.h>

void getcpuidex(unsigned int CPUInfo[4], unsigned int InfoType, unsigned int ECXValue)
{
#if defined(__GNUC__)    // GCC
    __cpuid_count(InfoType, ECXValue, CPUInfo[0],CPUInfo[1],CPUInfo[2],CPUInfo[3]);
#elif defined(_MSC_VER)    // MSVC
    #if defined(_WIN64) || _MSC_VER>=1600    // 64位下不支持内联汇编. 1600: VS2010, 据说VC2008 SP1之后才支持__cpuidex.
        __cpuidex((int*)(void*)CPUInfo, (int)InfoType, (int)ECXValue);
    #else
        if (NULL==CPUInfo)    return;
        _asm{
            // load. 读取参数到寄存器.
            mov edi, CPUInfo;    // 准备用edi寻址CPUInfo
            mov eax, InfoType;
            mov ecx, ECXValue;
            // CPUID
            cpuid;
            // save. 将寄存器保存到CPUInfo
            mov    [edi], eax;
            mov    [edi+4], ebx;
            mov    [edi+8], ecx;
            mov    [edi+12], edx;
        }
    #endif
#endif    // #if defined(__GNUC__)
}

void getcpuid(unsigned int CPUInfo[4], unsigned int InfoType)
{
#if defined(__GNUC__)    // GCC
    __cpuid(InfoType, CPUInfo[0],CPUInfo[1],CPUInfo[2],CPUInfo[3]);
#elif defined(_MSC_VER)    // MSVC
    #if _MSC_VER>=1400    // VC2005才支持__cpuid
        __cpuid((int*)(void*)CPUInfo, (int)InfoType);
    #else
        getcpuidex(CPUInfo, InfoType, 0);
    #endif
#endif    // #if defined(__GNUC__)
}