初学汇编之CPU类型识别

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http://www.cppblog.com/Jedimaster/archive/2006/08/18/11423.html

为了以后优化算法，还是硬着头皮学了一下汇编，也就是C\C++与汇编的混合编程，帖一个类的代码，非常简单的东西，觉得还可以优化。识别CPU的型号，使用了Intel的CPUID指令，还没有来得及看AMD的资料，以后有空了我也做一个类似于CPUID一样的小工具呵呵。

class CIntelCpuInfo{private:    DWORD m_VersionInfo;    DWORD m_Features;        void GetFeatures();    void GetVersionInfo();public:    CIntelCpuInfo() {};    ~CIntelCpuInfo() {};    void Show();};void CIntelCpuInfo::Show(){    this->GetVersionInfo();    this->GetFeatures();};void CIntelCpuInfo::GetVersionInfo(){    DWORD VER;    DWORD BACKUP;    DWORD STEP,MODEL,FAMILY;    __asm{        MOV EAX,01H;        CPUID;        MOV VER,EAX;        MOV BACKUP,EAX;        AND EAX,0000000FH;        MOV STEP,EAX;        MOV EAX,BACKUP;        SHR EAX,4;        AND EAX,0000000FH;        MOV MODEL,EAX;        MOV EAX,BACKUP;        SHR EAX,8;        AND EAX,0000000FH;        MOV FAMILY,EAX;    };    cout<<"Family ID : "<<FAMILY<<" Stepping ID : "<<STEP<<" Model : "<<MODEL<<endl;};void CIntelCpuInfo::GetFeatures(){    DWORD C,D;    DWORD SSE3Tag;    DWORD SSTEPTag;    DWORD SSE2Tag;    DWORD SSE1Tag;    DWORD MMXTag;    __asm{        MOV EAX,01H;        CPUID;        MOV C,ECX;        PUSH ECX;        AND ECX,01H;        MOV SSE3Tag,ECX;        POP ECX;        AND ECX,0080H;        MOV SSTEPTag,ECX;        SHR SSTEPTag,7;        MOV D,EDX;        SHR EDX,23;        PUSH EDX;        PUSH EDX;        AND EDX,01H;        MOV MMXTag,EDX;        POP EDX;        SHR EDX,2;        AND EDX,01H;        MOV SSE1Tag,EDX;        POP EDX;        SHR EDX,3;        AND EDX,01H;        MOV SSE2Tag,EDX;    };    cout<<"SSE3 Support ? "<<SSE3Tag<<endl;    cout<<"SSE2 Support ? "<<SSE2Tag<<endl;    cout<<"SSE1 Support ? "<<SSE1Tag<<endl;    cout<<"Enhanced SpeedStepping ? "<<SSTEPTag<<endl;};

我的CPU是2002年下半年的，Intel Pentium 4 Northwood 1.8GA，嗬嗬，搞得多么先进一样。截图如下，

结果完全正确。有了一些经验，在以后的程序中，可以通过识别CPU类型进行额外的优化，以后好好的研究Intel的Manual。