src/fftw/fcr_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 13:55:04 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 -hc2real 3 */
  27
  28 /*
  29  * This function contains 4 FP additions, 2 FP multiplications,
  30  * (or, 3 additions, 1 multiplications, 1 fused multiply/add),
  31  * 5 stack variables, and 6 memory accesses
  32  */
  33 static const fftw_real K2_000000000 = FFTW_KONST(+2.000000000000000000000000000000000000000000000);
  34 static const fftw_real K1_732050807 = FFTW_KONST(+1.732050807568877293527446341505872366942805254);
  35
  36 /*
  37  * Generator Id's :
  38  * $Id$
  39  * $Id$
  40  * $Id$
  41  */
  42
  43 void fftw_hc2real_3(const fftw_real *real_input, const fftw_real *imag_input, fftw_real *output, int real_istride, int imag_istride, int ostride)
  44 {
  45      fftw_real tmp5;
  46      fftw_real tmp1;
  47      fftw_real tmp2;
  48      fftw_real tmp3;
  49      fftw_real tmp4;
  50      ASSERT_ALIGNED_DOUBLE();
  51      tmp4 = imag_input[imag_istride];
  52      tmp5 = K1_732050807 * tmp4;
  53      tmp1 = real_input[0];
  54      tmp2 = real_input[real_istride];
  55      tmp3 = tmp1 - tmp2;
  56      output[0] = tmp1 + (K2_000000000 * tmp2);
  57      output[2 * ostride] = tmp3 + tmp5;
  58      output[ostride] = tmp3 - tmp5;
  59 }
  60
  61 fftw_codelet_desc fftw_hc2real_3_desc =
  62 {
  63      "fftw_hc2real_3",
  64      (void (*)()) fftw_hc2real_3,
  65      3,
  66      FFTW_BACKWARD,
  67      FFTW_HC2REAL,
  68      81,
  69      0,
  70      (const int *) 0,
  71 };