src/fftw/ftwi_2.c

   1 /*
   2  * Copyright (c) 1997-1999 Massachusetts Institute of Technology
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  *
  18  */
  19
  20 /* This file was automatically generated --- DO NOT EDIT */
  21 /* Generated on Tue May 18 13:55:45 EDT 1999 */
  22
  23 #include <fftw-int.h>
  24 #include <fftw.h>
  25
  26 /* Generated by: ./genfft -magic-alignment-check -magic-twiddle-load-all -magic-variables 4 -magic-loopi -twiddleinv 2 */
  27
  28 /*
  29  * This function contains 6 FP additions, 4 FP multiplications,
  30  * (or, 4 additions, 2 multiplications, 2 fused multiply/add),
  31  * 10 stack variables, and 8 memory accesses
  32  */
  33
  34 /*
  35  * Generator Id's :
  36  * $Id$
  37  * $Id$
  38  * $Id$
  39  */
  40
  41 void fftwi_twiddle_2(fftw_complex *A, const fftw_complex *W, int iostride, int m, int dist)
  42 {
  43      int i;
  44      fftw_complex *inout;
  45      inout = A;
  46      for (i = m; i > 0; i = i - 1, inout = inout + dist, W = W + 1) {
  47           fftw_real tmp1;
  48           fftw_real tmp8;
  49           fftw_real tmp6;
  50           fftw_real tmp7;
  51           ASSERT_ALIGNED_DOUBLE();
  52           tmp1 = c_re(inout[0]);
  53           tmp8 = c_im(inout[0]);
  54           {
  55                fftw_real tmp3;
  56                fftw_real tmp5;
  57                fftw_real tmp2;
  58                fftw_real tmp4;
  59                ASSERT_ALIGNED_DOUBLE();
  60                tmp3 = c_re(inout[iostride]);
  61                tmp5 = c_im(inout[iostride]);
  62                tmp2 = c_re(W[0]);
  63                tmp4 = c_im(W[0]);
  64                tmp6 = (tmp2 * tmp3) + (tmp4 * tmp5);
  65                tmp7 = (tmp2 * tmp5) - (tmp4 * tmp3);
  66           }
  67           c_re(inout[iostride]) = tmp1 - tmp6;
  68           c_re(inout[0]) = tmp1 + tmp6;
  69           c_im(inout[0]) = tmp7 + tmp8;
  70           c_im(inout[iostride]) = tmp8 - tmp7;
  71      }
  72 }
  73
  74 static const int twiddle_order[] =
  75 {1};
  76 fftw_codelet_desc fftwi_twiddle_2_desc =
  77 {
  78      "fftwi_twiddle_2",
  79      (void (*)()) fftwi_twiddle_2,
  80      2,
  81      FFTW_BACKWARD,
  82      FFTW_TWIDDLE,
  83      55,
  84      1,
  85      twiddle_order,
  86 };