isa_available.cpp File Reference

#include <isa_availability.h>
#include <intrin.h>
#include <windef.h>
#include <winbase.h>

Include dependency graph for isa_available.cpp:

Go to the source code of this file.

Functions
int __cdecl	__isa_available_init (void)

Variables
int	__isa_available = 0

Function Documentation

__isa_available_init()

int __cdecl __isa_available_init

(

void

)

Definition at line 21 of file isa_available.cpp.

{
#if defined(_M_IX86) || defined(_M_X64)
    if (IsProcessorFeaturePresent(PF_AVX512F_INSTRUCTIONS_AVAILABLE))
    {
        __isa_available = __ISA_AVAILABLE_AVX512;
    }
    else if (IsProcessorFeaturePresent(PF_AVX2_INSTRUCTIONS_AVAILABLE))
    {
        __isa_available = __ISA_AVAILABLE_AVX2;
    }
    else if (IsProcessorFeaturePresent(PF_AVX_INSTRUCTIONS_AVAILABLE))
    {
        __isa_available = __ISA_AVAILABLE_AVX;
    }
    else if (IsProcessorFeaturePresent(PF_SSE4_2_INSTRUCTIONS_AVAILABLE))
    {
        __isa_available = __ISA_AVAILABLE_SSE42;
    }
    else if (IsProcessorFeaturePresent(PF_XMMI64_INSTRUCTIONS_AVAILABLE))
    {
        __isa_available = __ISA_AVAILABLE_SSE2;
    }
    else
    {
        __isa_available = __ISA_AVAILABLE_X86;
    }
#elif defined(_M_ARM) || defined(_M_ARM64)
    // CHECKME: Is this correct?
    if (IsProcessorFeaturePresent(PF_ARM_V8_INSTRUCTIONS_AVAILABLE))
    {
#ifdef _M_ARM64
        __isa_available = __ISA_AVAILABLE_NEON_ARM64;
#else
        __isa_available = __ISA_AVAILABLE_NEON;
#endif
    }
    else
    {
        __isa_available = __ISA_AVAILABLE_ARMNT;
    }
#endif
 
    return 0;
}

Referenced by __acrt_initialize(), and __scrt_initialize().

Variable Documentation

__isa_available

int __isa_available = 0

Definition at line 16 of file isa_available.cpp.

Referenced by __isa_available_init().