src/fftw/ftw_3.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 13:55:18 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 -twiddle 3 */
  27
  28 /*
  29  * This function contains 16 FP additions, 12 FP multiplications,
  30  * (or, 10 additions, 6 multiplications, 6 fused multiply/add),
  31  * 14 stack variables, and 12 memory accesses
  32  */
  33 static const fftw_real K866025403 = FFTW_KONST(+0.866025403784438646763723170752936183471402627);
  34 static const fftw_real K500000000 = FFTW_KONST(+0.500000000000000000000000000000000000000000000);
  35
  36 /*
  37  * Generator Id's :
  38  * $Id$
  39  * $Id$
  40  * $Id$
  41  */
  42
  43 void fftw_twiddle_3(fftw_complex *A, const fftw_complex *W, int iostride, int m, int dist)
  44 {
  45      int i;
  46      fftw_complex *inout;
  47      inout = A;
  48      for (i = m; i > 0; i = i - 1, inout = inout + dist, W = W + 2) {
  49           fftw_real tmp1;
  50           fftw_real tmp18;
  51           fftw_real tmp6;
  52           fftw_real tmp14;
  53           fftw_real tmp11;
  54           fftw_real tmp15;
  55           fftw_real tmp12;
  56           fftw_real tmp17;
  57           ASSERT_ALIGNED_DOUBLE();
  58           tmp1 = c_re(inout[0]);
  59           tmp18 = c_im(inout[0]);
  60           {
  61                fftw_real tmp3;
  62                fftw_real tmp5;
  63                fftw_real tmp2;
  64                fftw_real tmp4;
  65                ASSERT_ALIGNED_DOUBLE();
  66                tmp3 = c_re(inout[iostride]);
  67                tmp5 = c_im(inout[iostride]);
  68                tmp2 = c_re(W[0]);
  69                tmp4 = c_im(W[0]);
  70                tmp6 = (tmp2 * tmp3) - (tmp4 * tmp5);
  71                tmp14 = (tmp4 * tmp3) + (tmp2 * tmp5);
  72           }
  73           {
  74                fftw_real tmp8;
  75                fftw_real tmp10;
  76                fftw_real tmp7;
  77                fftw_real tmp9;
  78                ASSERT_ALIGNED_DOUBLE();
  79                tmp8 = c_re(inout[2 * iostride]);
  80                tmp10 = c_im(inout[2 * iostride]);
  81                tmp7 = c_re(W[1]);
  82                tmp9 = c_im(W[1]);
  83                tmp11 = (tmp7 * tmp8) - (tmp9 * tmp10);
  84                tmp15 = (tmp9 * tmp8) + (tmp7 * tmp10);
  85           }
  86           tmp12 = tmp6 + tmp11;
  87           tmp17 = tmp14 + tmp15;
  88           {
  89                fftw_real tmp13;
  90                fftw_real tmp16;
  91                fftw_real tmp19;
  92                fftw_real tmp20;
  93                ASSERT_ALIGNED_DOUBLE();
  94                c_re(inout[0]) = tmp1 + tmp12;
  95                tmp13 = tmp1 - (K500000000 * tmp12);
  96                tmp16 = K866025403 * (tmp14 - tmp15);
  97                c_re(inout[2 * iostride]) = tmp13 - tmp16;
  98                c_re(inout[iostride]) = tmp13 + tmp16;
  99                c_im(inout[0]) = tmp17 + tmp18;
 100                tmp19 = K866025403 * (tmp11 - tmp6);
 101                tmp20 = tmp18 - (K500000000 * tmp17);
 102                c_im(inout[iostride]) = tmp19 + tmp20;
 103                c_im(inout[2 * iostride]) = tmp20 - tmp19;
 104           }
 105      }
 106 }
 107
 108 static const int twiddle_order[] =
 109 {1, 2};
 110 fftw_codelet_desc fftw_twiddle_3_desc =
 111 {
 112      "fftw_twiddle_3",
 113      (void (*)()) fftw_twiddle_3,
 114      3,
 115      FFTW_FORWARD,
 116      FFTW_TWIDDLE,
 117      66,
 118      2,
 119      twiddle_order,
 120 };