/* Compute weighted cross-power spectrum of a half-complex (packed) vector with conjugate  */
static void weighted_spectral_mul_conj(const spx_float_t *w, const spx_float_t p, const spx_word16_t *X, const spx_word16_t *Y, spx_word32_t *prod, int N)
/* Compute weighted cross-power spectrum of a half-complex (packed) vector with conjugate  */
static void weighted_spectral_mul_conj(const spx_float_t *w, const spx_float_t p, const spx_word16_t *X, const spx_word16_t *Y, spx_word32_t *prod, int N)
{
   int i, j;
   spx_float_t W;
   W = FLOAT_AMULT(p, w[0]);
   prod[0] = FLOAT_MUL32(W,MULT16_16(X[0],Y[0]));
   for (i=1,j=1;i<N-1;i+=2,j++)
   {
      W = FLOAT_AMULT(p, w[j]);
      prod[i] = FLOAT_MUL32(W,MAC16_16(MULT16_16(X[i],Y[i]), X[i+1],Y[i+1]));
      prod[i+1] = FLOAT_MUL32(W,MAC16_16(MULT16_16(-X[i+1],Y[i]), X[i],Y[i+1]));
   }
   W = FLOAT_AMULT(p, w[j]);
   prod[i] = FLOAT_MUL32(W,MULT16_16(X[i],Y[i]));
}