src/fftw/frc_8.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 13:54:34 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 -real2hc 8 */
  27
  28 /*
  29  * This function contains 20 FP additions, 2 FP multiplications,
  30  * (or, 20 additions, 2 multiplications, 0 fused multiply/add),
  31  * 12 stack variables, and 16 memory accesses
  32  */
  33 static const fftw_real K707106781 = FFTW_KONST(+0.707106781186547524400844362104849039284835938);
  34
  35 /*
  36  * Generator Id's :
  37  * $Id$
  38  * $Id$
  39  * $Id$
  40  */
  41
  42 void fftw_real2hc_8(const fftw_real *input, fftw_real *real_output, fftw_real *imag_output, int istride, int real_ostride, int imag_ostride)
  43 {
  44      fftw_real tmp3;
  45      fftw_real tmp7;
  46      fftw_real tmp13;
  47      fftw_real tmp19;
  48      fftw_real tmp6;
  49      fftw_real tmp16;
  50      fftw_real tmp10;
  51      fftw_real tmp18;
  52      ASSERT_ALIGNED_DOUBLE();
  53      {
  54           fftw_real tmp1;
  55           fftw_real tmp2;
  56           fftw_real tmp11;
  57           fftw_real tmp12;
  58           ASSERT_ALIGNED_DOUBLE();
  59           tmp1 = input[0];
  60           tmp2 = input[4 * istride];
  61           tmp3 = tmp1 + tmp2;
  62           tmp7 = tmp1 - tmp2;
  63           tmp11 = input[7 * istride];
  64           tmp12 = input[3 * istride];
  65           tmp13 = tmp11 - tmp12;
  66           tmp19 = tmp11 + tmp12;
  67      }
  68      {
  69           fftw_real tmp4;
  70           fftw_real tmp5;
  71           fftw_real tmp8;
  72           fftw_real tmp9;
  73           ASSERT_ALIGNED_DOUBLE();
  74           tmp4 = input[2 * istride];
  75           tmp5 = input[6 * istride];
  76           tmp6 = tmp4 + tmp5;
  77           tmp16 = tmp4 - tmp5;
  78           tmp8 = input[istride];
  79           tmp9 = input[5 * istride];
  80           tmp10 = tmp8 - tmp9;
  81           tmp18 = tmp8 + tmp9;
  82      }
  83      {
  84           fftw_real tmp17;
  85           fftw_real tmp20;
  86           fftw_real tmp14;
  87           fftw_real tmp15;
  88           ASSERT_ALIGNED_DOUBLE();
  89           real_output[2 * real_ostride] = tmp3 - tmp6;
  90           tmp17 = tmp3 + tmp6;
  91           tmp20 = tmp18 + tmp19;
  92           real_output[4 * real_ostride] = tmp17 - tmp20;
  93           real_output[0] = tmp17 + tmp20;
  94           imag_output[2 * imag_ostride] = tmp19 - tmp18;
  95           tmp14 = K707106781 * (tmp10 + tmp13);
  96           real_output[3 * real_ostride] = tmp7 - tmp14;
  97           real_output[real_ostride] = tmp7 + tmp14;
  98           tmp15 = K707106781 * (tmp13 - tmp10);
  99           imag_output[imag_ostride] = tmp15 - tmp16;
 100           imag_output[3 * imag_ostride] = tmp16 + tmp15;
 101      }
 102 }
 103
 104 fftw_codelet_desc fftw_real2hc_8_desc =
 105 {
 106      "fftw_real2hc_8",
 107      (void (*)()) fftw_real2hc_8,
 108      8,
 109      FFTW_FORWARD,
 110      FFTW_REAL2HC,
 111      178,
 112      0,
 113      (const int *) 0,
 114 };