Extract the ASM code for CPU detection from x264 and put it in the VC project.

Reference: http://blog.csdn.net/eagler_hzh/article/details/6550841

In fact, the function to be extracted is the void Xid _cpu_detect (void) in x264 \ common \ CPU. C. The source file

int x264_cpu_cpuid_test( void );void x264_cpu_cpuid( uint32_t op, uint32_t *eax, uint32_t *ebx, uint32_t *ecx, uint32_t *edx );void x264_cpu_xgetbv( uint32_t op, uint32_t *eax, uint32_t *edx );uint32_t x264_cpu_detect( void ){    uint32_t cpu = 0;    uint32_t eax, ebx, ecx, edx;    uint32_t vendor[4] = {0};    uint32_t max_extended_cap;    int cache;#if !ARCH_X86_64    if( !x264_cpu_cpuid_test() )        return 0;#endif    x264_cpu_cpuid( 0, &eax, vendor+0, vendor+2, vendor+1 );    if( eax == 0 )        return 0;    x264_cpu_cpuid( 1, &eax, &ebx, &ecx, &edx );    if( edx&0x00800000 )        cpu |= X264_CPU_MMX;    else        return 0;    if( edx&0x02000000 )        cpu |= X264_CPU_MMXEXT|X264_CPU_SSE;    if( edx&0x04000000 )        cpu |= X264_CPU_SSE2;    if( ecx&0x00000001 )        cpu |= X264_CPU_SSE3;    if( ecx&0x00000200 )        cpu |= X264_CPU_SSSE3;    if( ecx&0x00080000 )        cpu |= X264_CPU_SSE4;    if( ecx&0x00100000 )        cpu |= X264_CPU_SSE42;    /* Check OXSAVE and AVX bits */    if( (ecx&0x18000000) == 0x18000000 )    {        /* Check for OS support */        x264_cpu_xgetbv( 0, &eax, &edx );        if( (eax&0x6) == 0x6 )            cpu |= X264_CPU_AVX;    }    if( cpu & X264_CPU_SSSE3 )        cpu |= X264_CPU_SSE2_IS_FAST;    if( cpu & X264_CPU_SSE4 )        cpu |= X264_CPU_SHUFFLE_IS_FAST;    x264_cpu_cpuid( 0x80000000, &eax, &ebx, &ecx, &edx );    max_extended_cap = eax;    if( !strcmp((char*)vendor, "AuthenticAMD") && max_extended_cap >= 0x80000001 )    {        cpu |= X264_CPU_SLOW_CTZ;        x264_cpu_cpuid( 0x80000001, &eax, &ebx, &ecx, &edx );        if( edx&0x00400000 )            cpu |= X264_CPU_MMXEXT;        if( cpu & X264_CPU_SSE2 )        {            if( ecx&0x00000040 ) /* SSE4a */            {                cpu |= X264_CPU_SSE2_IS_FAST;                cpu |= X264_CPU_LZCNT;                cpu |= X264_CPU_SHUFFLE_IS_FAST;                cpu &= ~X264_CPU_SLOW_CTZ;            }            else                cpu |= X264_CPU_SSE2_IS_SLOW;            if( ecx&0x00000080 ) /* Misalign SSE */            {                cpu |= X264_CPU_SSE_MISALIGN;                x264_cpu_mask_misalign_sse();            }        }    }    if( !strcmp((char*)vendor, "GenuineIntel") )    {        x264_cpu_cpuid( 1, &eax, &ebx, &ecx, &edx );        int family = ((eax>>8)&0xf) + ((eax>>20)&0xff);        int model  = ((eax>>4)&0xf) + ((eax>>12)&0xf0);        if( family == 6 )        {            /* 6/9 (pentium-m "banias"), 6/13 (pentium-m "dothan"), and 6/14 (core1 "yonah")             * theoretically support sse2, but it's significantly slower than mmx for             * almost all of x264's functions, so let's just pretend they don't. */            if( model == 9 || model == 13 || model == 14 )            {                cpu &= ~(X264_CPU_SSE2|X264_CPU_SSE3);                assert(!(cpu&(X264_CPU_SSSE3|X264_CPU_SSE4)));            }            /* Detect Atom CPU */            else if( model == 28 )            {                cpu |= X264_CPU_SLOW_ATOM;                cpu |= X264_CPU_SLOW_CTZ;            }            /* Some Penryns and Nehalems are pointlessly crippled (SSE4 disabled), so             * detect them here. */            else if( model >= 23 )                cpu |= X264_CPU_SHUFFLE_IS_FAST;        }    }    if( (!strcmp((char*)vendor, "GenuineIntel") || !strcmp((char*)vendor, "CyrixInstead")) && !(cpu&X264_CPU_SSE42))    {        /* cacheline size is specified in 3 places, any of which may be missing */        x264_cpu_cpuid( 1, &eax, &ebx, &ecx, &edx );        cache = (ebx&0xff00)>>5; // cflush size        if( !cache && max_extended_cap >= 0x80000006 )        {            x264_cpu_cpuid( 0x80000006, &eax, &ebx, &ecx, &edx );            cache = ecx&0xff; // cacheline size        }        if( !cache )        {            // Cache and TLB Information            static const char cache32_ids[] = { 0x0a, 0x0c, 0x41, 0x42, 0x43, 0x44, 0x45, 0x82, 0x83, 0x84, 0x85, 0 };            static const char cache64_ids[] = { 0x22, 0x23, 0x25, 0x29, 0x2c, 0x46, 0x47, 0x49, 0x60, 0x66, 0x67,                                                0x68, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7c, 0x7f, 0x86, 0x87, 0 };            uint32_t buf[4];            int max, i = 0;            do {                x264_cpu_cpuid( 2, buf+0, buf+1, buf+2, buf+3 );                max = buf[0]&0xff;                buf[0] &= ~0xff;                for( int j = 0; j < 4; j++ )                    if( !(buf[j]>>31) )                        while( buf[j] )                        {                            if( strchr( cache32_ids, buf[j]&0xff ) )                                cache = 32;                            if( strchr( cache64_ids, buf[j]&0xff ) )                                cache = 64;                            buf[j] >>= 8;                        }            } while( ++i < max );        }        if( cache == 32 )            cpu |= X264_CPU_CACHELINE_32;        else if( cache == 64 )            cpu |= X264_CPU_CACHELINE_64;        else            x264_log( NULL, X264_LOG_WARNING, "unable to determine cacheline size\n" );    }#if BROKEN_STACK_ALIGNMENT    cpu |= X264_CPU_STACK_MOD4;#endif    return cpu;}

Int x264_cpu_cpuid_test (void );
Void x264_cpu_cpuid (uint32_t op, uint32_t * eax, uint32_t * EBX, uint32_t * ECx, uint32_t * EDX );
Void x264_cpu_xgetbv (uint32_t op, uint32_t * eax, uint32_t * EDX );

These three functions are implemented in ASM, location x264 \ common \ x86 \ cpu-a.asm

The cpu-a.asm references x264 \ common \ x86 \ x86inc. ASM, directly copy all the content of x86inc. ASM to the cpu-a.asm.

Then add the cpu-a.asm to the VC project, install NASM (http://www.nasm.us/), right-click the cpu-a.asm file in the VC solution file list and choose Properties from the following settings:

I am a VC dialog box project, and C functions are included in x264. Therefore, when using the function, add extern "C ". A function in CPU-A is defined

;-----------------------------------------------------------------------------; void cpu_cpuid( int op, int *eax, int *ebx, int *ecx, int *edx );-----------------------------------------------------------------------------cglobal cpu_cpuid, 5,7    push rbx    push  r4    push  r3    push  r2    push  r1    mov  eax, r0d    cpuid    pop  rsi    mov [rsi], eax    pop  rsi    mov [rsi], ebx    pop  rsi    mov [rsi], ecx    pop  rsi    mov [rsi], edx    pop  rbx    RET

However, if you want to use it outside, it is void x264_cpu_cpuid (...), the macro cglobal has changed its name, starting with % define program_name x264. What is its last name, dumpbin/All XXX. OBJ.

Call:

// Check the CPU code extern "C" Void x264_cpu_cpuid (INT op, int * eax, int * EBX, int * ECx, int * EDX); void cdialogdlg: onbnclickedbuttoncpudec () {// todo: add the control notification handler code int CPU = 0; int eax, EBX, ECx, EDX; int vendor [4] = {0}; int max_extended_cap; int cache; x1__cpu_cpuid (0, & eax, vendor + 0, vendor + 2, vendor + 1); If (eax = 0) return; // continue operation}

Or not. Directly in the command line

nasm -f win32 -DPREFIX cpu-a.asm

Come out of the cpu-a.obj, and then use the tool provided by VC

lib cpu-a.obj

I came out of the cpu-a.lib, and then threw lib to the VC Project LINK, In the extern "C" declaration function can also be used.