SIMD

          
// FPU:

#define PF_FPU		1<<0

// MMX:

#define PF_MMX		1<<1

// AMD MMX:

#define PF_EMMX		1<<2

// 3DNow!:

#define PF_3DNOW	1<<3

// 3DNow Extensions:

#define PF_E3DNOW	1<<4

// SIMD:

#define PF_SSE		1<<5

   
BOOL GetCPUFeatures(char* szMan, DWORD dwFeatures)
{
BOOL bHasCPUID = FALSE;
DWORD dwStdFeatures = 0;
DWORD dwExFeatures = 0;
   
   szMan[12] = 0;
   dwFeatures = 0;
   _asm
   {
      // First check for a CPUID instruction (at least a 486) //

      pushfd
      pop eax
      mov edx, eax
      xor eax, 1<<21
      push eax
      popfd
      pushfd
      pop eax
      xor eax,edx
      jz short done
      mov [bHasCPUID], 1
   
      // Get Manufacturer //

      mov eax, 0   // CPUID function 0 : Manufacturer + highest CPUID

      cpuid
      mov dword ptr szMan, ebx
      mov dword ptr szMan+4, edx
      mov dword ptr szMan+8, ecx
   
      // AMD ('AuthenticAMD')? //

      cmp ebx, 'htuA'
      jne short not_amd
      cmp edx, 'itne'
      jne short not_amd
      cmp ecx, 'DMAc'
      je get_features
      not_amd:
   
      // Intel ('GenuineIntel')? //

      cmp ebx, 'uneG'
      jne short not_intel
      cmp edx, 'Ieni'
      jne short not_intel
      cmp ecx, 'letn'
      je get_features
      not_intel:
   
      // Cyrix ('CyrixInstead')? //

      cmp ebx, 'iryC'
      jne short not_cyrix
      cmp edx, 'snIx'
      jne short not_cyrix
      cmp ecx, 'deat'
      je get_features
      not_cyrix:
   
      get_features:
      cmp eax, 1
      jb short done
      mov eax, 1   // CPUID function 1 : Features + Version

      cpuid
      mov [dwStdFeatures], edx
   
      // Next find out which extended features are present (if any) //

      mov eax, 0x80000000 // CPUID 80000000 : how many extended features

      cpuid
      cmp eax, 0x80000001 // check for at least 1 extended function

      jb short done
      mov eax, 0x80000001 // CPUID 80000001 : Extended features list

      cpuid
      mov [dwExFeatures], edx
      done:
   }
   
   if(!bHasCPUID)
      return FALSE;
   
   // FPU (Floating Point Unit) //

   if(dwStdFeatures & 1<<0)
      dwFeatures |= PF_FPU;
   else
      return FALSE;
   
   // MMX (Multi Media eXtensions) //

   if(dwStdFeatures & 1<<23)
      dwFeatures |= PF_MMX;
   
   // AMD MMX Extensions //

   if(dwExFeatures & 1<<22)
      dwFeatures |= PF_EMMX;
   
   // AMD 3DNow! present //

   if(dwExFeatures & 1<<31)
      dwFeatures |= PF_3DNOW;
   
   // AMD 3DNow! Extensions //

   if(dwExFeatures & 1<<30)
      dwFeatures |= PF_E3DNOW;
   
   // SSE present //

   if(dwStdFeatures & 1<<25)
      dwFeatures |= PF_SSE;
   
   return TRUE;
}