1  typedef _Complex float __m128;
       2  extern __m128 _mm_sub_ps (__m128 __A, __m128 __B);
       3  extern __m128 _mm_mul_ps (__m128 __A, __m128 __B);
       4  __m128
       5  vq_nbest(const __m128 *codebook, __m128 d, __m128 in)
       6  {
       7    return _mm_sub_ps(d, _mm_mul_ps(in, *codebook++));
       8  }