qtbase-opensource-src/config.tests/avx512/avx512.cpp

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#include <immintrin.h>

#ifndef __AVX512F__
#  error "There doesn't seem to be AVX-512 support in this compiler"
#endif
#ifndef WANT_AVX512
#  error ".pro file must define WANT_AVX512 macro to the AVX-512 feature to be tested"
#endif

// The following checks if __AVXx__ is defined, where x is the value in
// WANT_AVX512
#define HAS2(x)             __AVX512 ## x ## __
#define HAS(x)              HAS2(x)
#if !HAS(WANT_AVX512)
#  error "Feature not supported"
#endif

int main(int, char**argv)
{
    /* AVX512 Foundation */
    __m512i i;
    __m512d d;
    __m512 f;
    __mmask16 m = ~1;
    i = _mm512_maskz_loadu_epi32(0, argv);
    d = _mm512_loadu_pd((double *)argv + 64);
    f = _mm512_loadu_ps((float *)argv + 128);

    // some intrinsic that GCC forgot until GCC 8
    i = _mm512_maskz_set1_epi32(m, '?');
    _mm512_mask_cvtepi32_storeu_epi8(argv, m, i);

#ifdef WANT_AVX512ER
    /* AVX512 Exponential and Reciprocal */
    f =  _mm512_exp2a23_round_ps(f, 8);
#endif
#ifdef WANT_AVX512CD
    /* AVX512 Conflict Detection */
    i = _mm512_maskz_conflict_epi32(m, i);
#endif
#ifdef WANT_AVX512PF
    /* AVX512 Prefetch */
    _mm512_mask_prefetch_i64scatter_pd(argv, 0xf, i, 2, 2);
#endif
#ifdef WANT_AVX512DQ
    /* AVX512 Doubleword and Quadword support */
    m = _mm512_movepi32_mask(i);
#endif
#ifdef WANT_AVX512BW
    /* AVX512 Byte and Word support */
    i =  _mm512_mask_loadu_epi8(i, m, argv - 8);
    _mm512_mask_cvtepi16_storeu_epi8(argv + 8, m, i);
#endif
#ifdef WANT_AVX512VL
    /* AVX512 Vector Length */
    __m256i i2 = _mm256_maskz_loadu_epi32(0, argv);
    _mm256_mask_storeu_epi32(argv + 1, m, i2);
#endif
#ifdef WANT_AVX512IFMA
    /* AVX512 Integer Fused Multiply-Add */
    i = _mm512_madd52lo_epu64(i, i, i);
#endif
#ifdef WANT_AVX512VBMI
    /* AVX512 Vector Byte Manipulation Instructions */
    i = _mm512_permutexvar_epi8(i, i);
#endif

    _mm512_mask_storeu_epi64(argv, m, i);
    _mm512_mask_storeu_ps(argv + 64, m, f);
    _mm512_mask_storeu_pd(argv + 128, m, d);
    return 0;
}