src/fftw/fni_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 13:54:43 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 -notwiddleinv 3 */
  27
  28 /*
  29  * This function contains 12 FP additions, 4 FP multiplications,
  30  * (or, 10 additions, 2 multiplications, 2 fused multiply/add),
  31  * 12 stack variables, and 12 memory accesses
  32  */
  33 static const fftw_real K500000000 = FFTW_KONST(+0.500000000000000000000000000000000000000000000);
  34 static const fftw_real K866025403 = FFTW_KONST(+0.866025403784438646763723170752936183471402627);
  35
  36 /*
  37  * Generator Id's :
  38  * $Id$
  39  * $Id$
  40  * $Id$
  41  */
  42
  43 void fftwi_no_twiddle_3(const fftw_complex *input, fftw_complex *output, int istride, int ostride)
  44 {
  45      fftw_real tmp1;
  46      fftw_real tmp6;
  47      fftw_real tmp4;
  48      fftw_real tmp5;
  49      fftw_real tmp9;
  50      fftw_real tmp12;
  51      fftw_real tmp11;
  52      fftw_real tmp10;
  53      ASSERT_ALIGNED_DOUBLE();
  54      tmp1 = c_re(input[0]);
  55      tmp6 = c_im(input[0]);
  56      {
  57           fftw_real tmp2;
  58           fftw_real tmp3;
  59           fftw_real tmp7;
  60           fftw_real tmp8;
  61           ASSERT_ALIGNED_DOUBLE();
  62           tmp2 = c_re(input[istride]);
  63           tmp3 = c_re(input[2 * istride]);
  64           tmp4 = tmp2 + tmp3;
  65           tmp5 = K866025403 * (tmp2 - tmp3);
  66           tmp7 = c_im(input[istride]);
  67           tmp8 = c_im(input[2 * istride]);
  68           tmp9 = tmp7 + tmp8;
  69           tmp12 = K866025403 * (tmp8 - tmp7);
  70      }
  71      c_re(output[0]) = tmp1 + tmp4;
  72      tmp11 = tmp1 - (K500000000 * tmp4);
  73      c_re(output[2 * ostride]) = tmp11 - tmp12;
  74      c_re(output[ostride]) = tmp11 + tmp12;
  75      c_im(output[0]) = tmp6 + tmp9;
  76      tmp10 = tmp6 - (K500000000 * tmp9);
  77      c_im(output[ostride]) = tmp5 + tmp10;
  78      c_im(output[2 * ostride]) = tmp10 - tmp5;
  79 }
  80
  81 fftw_codelet_desc fftwi_no_twiddle_3_desc =
  82 {
  83      "fftwi_no_twiddle_3",
  84      (void (*)()) fftwi_no_twiddle_3,
  85      3,
  86      FFTW_BACKWARD,
  87      FFTW_NOTW,
  88      78,
  89      0,
  90      (const int *) 0,
  91 };