1 /*
2 * Copyright (c) 1997-1999, 2003 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 Mon Mar 24 02:05:52 EST 2003 */
22
23 #include "fftw-int.h"
24 #include "fftw.h"
25
26 /* Generated by: /homee/stevenj/cvs/fftw/gensrc/genfft -magic-alignment-check -magic-twiddle-load-all -magic-variables 4 -magic-loopi -real2hc 4 */
27
28 /*
29 * This function contains 6 FP additions, 0 FP multiplications,
30 * (or, 6 additions, 0 multiplications, 0 fused multiply/add),
31 * 6 stack variables, and 8 memory accesses
32 */
33
34 /*
35 * Generator Id's :
36 * $Id: exprdag.ml,v 1.43 2003/03/16 23:43:46 stevenj Exp $
37 * $Id: fft.ml,v 1.44 2003/03/16 23:43:46 stevenj Exp $
38 * $Id: to_c.ml,v 1.26 2003/03/16 23:43:46 stevenj Exp $
39 */
40
fftw_real2hc_4(const fftw_real * input,fftw_real * real_output,fftw_real * imag_output,int istride,int real_ostride,int imag_ostride)41 void fftw_real2hc_4(const fftw_real *input, fftw_real *real_output,
42 fftw_real *imag_output, int istride, int real_ostride,
43 int imag_ostride)
44 {
45 fftw_real tmp1;
46 fftw_real tmp2;
47 fftw_real tmp3;
48 fftw_real tmp4;
49 fftw_real tmp5;
50 fftw_real tmp6;
51 ASSERT_ALIGNED_DOUBLE;
52 tmp1 = input[0];
53 tmp2 = input[2 * istride];
54 tmp3 = tmp1 + tmp2;
55 tmp4 = input[istride];
56 tmp5 = input[3 * istride];
57 tmp6 = tmp4 + tmp5;
58 real_output[real_ostride] = tmp1 - tmp2;
59 imag_output[imag_ostride] = -(tmp4 - tmp5);
60 real_output[2 * real_ostride] = tmp3 - tmp6;
61 real_output[0] = tmp3 + tmp6;
62 }
63
64 fftw_codelet_desc fftw_real2hc_4_desc = {
65 "fftw_real2hc_4",
66 (void (*)()) fftw_real2hc_4,
67 4,
68 FFTW_FORWARD,
69 FFTW_REAL2HC,
70 90,
71 0,
72 (const int *) 0,
73 };
74