numpy/distutils/checks/cpu_avx512_knl.c

#if defined(DETECT_FEATURES) && defined(__INTEL_COMPILER)
    /*
     * Unlike GCC and CLANG, Intel Compiler exposes all supported intrinsics,
     * whether or not the build options for those features are specified.
     * Therefore, we must test #definitions of CPU features when option native/host
     * is enabled via `--cpu-baseline` or through env var `CFLAGS` otherwise
     * the test will be broken and leads to enable all possible features.
     */
    #if !defined(__AVX512ER__) || !defined(__AVX512PF__)
        #error "HOST/ARCH doesn't support Knights Landing AVX512 features"
    #endif
#endif

#include <immintrin.h>

int main(int argc, char **argv)
{
    int base[128]={};
    __m512d ad = _mm512_loadu_pd((const __m512d*)argv[argc-1]);
    /* ER */
    __m512i a = _mm512_castpd_si512(_mm512_exp2a23_pd(ad));
    /* PF */
    _mm512_mask_prefetch_i64scatter_pd(base, _mm512_cmpeq_epi64_mask(a, a), a, 1, _MM_HINT_T1);
    return base[0];
}