cpu_capabilities (3) Linux Manual Page

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

Synopsis

#include <allegro.h>

extern int cpu_capabilities;

Description

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

 available.

 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()).

See Also

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