Function copy_and_norm

numpy/fft/_pocketfft.c:1698–1712

#undef WA

static void copy_and_norm(double *c, double *p1, size_t n, double fct)
  {
  if (p1!=c)
    {
    if (fct!=1.)
      for (size_t i=0; i<n; ++i)
        c[i] = fct*p1[i];
    else
      memcpy (c,p1,n*sizeof(double));
    }
  else
    if (fct!=1.)
      for (size_t i=0; i<n; ++i)
        c[i] *= fct;
  }

WARN_UNUSED_RESULT
static int rfftp_forward(rfftp_plan plan, double c[], double fct)