#if (__GNUC__ >= 5) && (__GNUC__ > 5 || __GNUC_MINOR__ > 2)
if (__builtin_cpu_supports("avx512f")) strcpy(instruction_set, "AVX512F");
else if (__builtin_cpu_supports("avx2")) strcpy(instruction_set, "AVX2");
#if (__GNUC__ >= 5) && (__GNUC__ > 5 || __GNUC_MINOR__ > 2)
if (__builtin_cpu_supports("avx512f")) strcpy(instruction_set, "AVX512F");
else if (__builtin_cpu_supports("avx2")) strcpy(instruction_set, "AVX2");