if (__builtin_cpu_supports("avx512f")) strcpy(instruction_set, "AVX512F");
        else if (__builtin_cpu_supports("avx2")) strcpy(instruction_set, "AVX2");
        #else 
        if (__builtin_cpu_supports("avx512f")) strcpy(instruction_set, "AVX512F");
        else if (__builtin_cpu_supports("avx2")) strcpy(instruction_set, "AVX2");
        #else