Function npyv_lut32_f32

numpy/core/src/common/simd/sse/memory.h:723–736

// uses vector as indexes into a table
// that contains 32 elements of float32.
NPY_FINLINE npyv_f32 npyv_lut32_f32(const float *table, npyv_u32 idx)
{
    const int i0 = _mm_cvtsi128_si32(idx);
#ifdef NPY_HAVE_SSE41
    const int i1 = _mm_extract_epi32(idx, 1);
    const int i2 = _mm_extract_epi32(idx, 2);
    const int i3 = _mm_extract_epi32(idx, 3);
#else
    const int i1 = _mm_extract_epi16(idx, 2);
    const int i2 = _mm_extract_epi16(idx, 4);
    const int i3 = _mm_extract_epi16(idx, 6);
#endif
    return npyv_set_f32(table[i0], table[i1], table[i2], table[i3]);
}
NPY_FINLINE npyv_u32 npyv_lut32_u32(const npy_uint32 *table, npyv_u32 idx)
{ return npyv_reinterpret_u32_f32(npyv_lut32_f32((const float*)table, idx)); }
NPY_FINLINE npyv_s32 npyv_lut32_s32(const npy_int32 *table, npyv_u32 idx)