dump1090-fa/starch/example/support.c

#ifdef __arm__

#include <asm/hwcap.h>
#include <sys/auxv.h>

int supports_neon_vfpv3(void)
{
    long hwcaps = getauxval(AT_HWCAP);
    return (hwcaps & HWCAP_ARM_NEON) && (hwcaps & HWCAP_ARM_VFPv3);
}

int supports_neon_vfpv4(void)
{
    long hwcaps = getauxval(AT_HWCAP);
    return (hwcaps & HWCAP_ARM_NEON) && (hwcaps & HWCAP_ARM_VFPv4);
}

#endif /* __arm__ */

#ifdef __x86_64__

#include <cpuid.h>
#include <stdio.h>

int supports_x86_avx(void)
{
    unsigned int maxlevel = __get_cpuid_max (0, 0);
    if (maxlevel < 1)
        return 0;
    
    unsigned eax, ebx, ecx, edx;
    __cpuid(1, eax, ebx, ecx, edx);
    if (!(ecx & bit_AVX))
        return 0;

    return 1;
}

int supports_x86_avx2(void)
{
    unsigned int maxlevel = __get_cpuid_max (0, 0);
    if (maxlevel < 7)
        return 0;
    
    unsigned eax, ebx, ecx, edx;
    __cpuid_count(7, 0, eax, ebx, ecx, edx);
    if (!(ebx & bit_AVX2))
        return 0;

    return 1;
}

#endif