cpu_capabilities(3alleg4)        Allegro manual        cpu_capabilities(3alleg4)

       cpu_capabilities - Contains the capability flags of the CPU. Allegro game
       programming library.

       #include <allegro.h>

       extern int cpu_capabilities;

       Contains CPU flags indicating what features are available on the current
       CPU. The flags can be any combination of these:

          CPU_ID       - Indicates that the "cpuid" instruction is
                         available. If this is set, then all Allegro CPU
                         variables are 100% reliable, otherwise there
                         may be some mistakes.
          CPU_FPU      - An FPU is available.
          CPU_IA64     - Running on Intel 64 bit CPU
          CPU_AMD64    - Running on AMD 64 bit CPU
          CPU_MMX      - Intel MMX  instruction set is available.
          CPU_MMXPLUS  - Intel MMX+ instruction set is available.
          CPU_SSE      - Intel SSE  instruction set is available.
          CPU_SSE2     - Intel SSE2 instruction set is available.
          CPU_SSE3     - Intel SSE3 instruction set is available.
          CPU_3DNOW    - AMD 3DNow! instruction set is available.
          CPU_ENH3DNOW - AMD Enhanced 3DNow! instruction set is
          CPU_CMOV     - Pentium Pro "cmov" instruction is available.

       You can check for multiple features by OR-ing the flags together.  For
       example, to check if the CPU has an FPU and MMX instructions available,
       you'd do:

          if ((cpu_capabilities & (CPU_FPU | CPU_MMX)) ==
              (CPU_FPU | CPU_MMX)) {
             printf("CPU has both an FPU and MMX instructions!\n");

       You can read this variable after you have called check_cpu() (which is
       automatically called by allegro_init()).

       check_cpu(3alleg4), cpu_vendor(3alleg4), cpu_family(3alleg4),
       cpu_model(3alleg4), cpu_capabilities(3alleg4), allegro_init(3alleg4)

Allegro                           version 4.4.3        cpu_capabilities(3alleg4)