Function npyv_lut16_f64

numpy/core/src/common/simd/sse/memory.h:744–753

uses vector as indexes into a table that contains 16 elements of float64.

// uses vector as indexes into a table
// that contains 16 elements of float64.
NPY_FINLINE npyv_f64 npyv_lut16_f64(const double *table, npyv_u64 idx)
{
    const int i0 = _mm_cvtsi128_si32(idx);
#ifdef NPY_HAVE_SSE41
    const int i1 = _mm_extract_epi32(idx, 2);
#else
    const int i1 = _mm_extract_epi16(idx, 4);
#endif
    return npyv_set_f64(table[i0], table[i1]);
}
NPY_FINLINE npyv_u64 npyv_lut16_u64(const npy_uint64 *table, npyv_u64 idx)
{ return npyv_reinterpret_u64_f64(npyv_lut16_f64((const double*)table, idx)); }
NPY_FINLINE npyv_s64 npyv_lut16_s64(const npy_int64 *table, npyv_u64 idx)