static float L2SqrSIMD16Ext()

in cpp/src/Spaces/Euclidean.h [100:129]

• 25 lines of code
• 2 McCabe index (conditional complexity)

static float L2SqrSIMD16Ext(const float *pVect1, const float *pVect2,
                            const size_t qty) {
  float PORTABLE_ALIGN32 TmpRes[8];
  size_t qty16 = qty >> 4;

  const float *pEnd1 = pVect1 + (qty16 << 4);

  __m256 diff, v1, v2;
  __m256 sum = _mm256_set1_ps(0);

  while (pVect1 < pEnd1) {
    v1 = _mm256_loadu_ps(pVect1);
    pVect1 += 8;
    v2 = _mm256_loadu_ps(pVect2);
    pVect2 += 8;
    diff = _mm256_sub_ps(v1, v2);
    sum = _mm256_add_ps(sum, _mm256_mul_ps(diff, diff));

    v1 = _mm256_loadu_ps(pVect1);
    pVect1 += 8;
    v2 = _mm256_loadu_ps(pVect2);
    pVect2 += 8;
    diff = _mm256_sub_ps(v1, v2);
    sum = _mm256_add_ps(sum, _mm256_mul_ps(diff, diff));
  }

  _mm256_store_ps(TmpRes, sum);
  return TmpRes[0] + TmpRes[1] + TmpRes[2] + TmpRes[3] + TmpRes[4] + TmpRes[5] +
         TmpRes[6] + TmpRes[7];
}