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 02:08:24 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 -twiddleinv 2 */
27
28 /*
29 * This function contains 6 FP additions, 4 FP multiplications,
30 * (or, 4 additions, 2 multiplications, 2 fused multiply/add),
31 * 10 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
fftwi_twiddle_2(fftw_complex * A,const fftw_complex * W,int iostride,int m,int dist)41 void fftwi_twiddle_2(fftw_complex *A, const fftw_complex *W, int iostride,
42 int m, int dist)
43 {
44 int i;
45 fftw_complex *inout;
46 inout = A;
47 for (i = m; i > 0; i = i - 1, inout = inout + dist, W = W + 1) {
48 fftw_real tmp1;
49 fftw_real tmp8;
50 fftw_real tmp6;
51 fftw_real tmp7;
52 ASSERT_ALIGNED_DOUBLE;
53 tmp1 = c_re(inout[0]);
54 tmp8 = c_im(inout[0]);
55 {
56 fftw_real tmp3;
57 fftw_real tmp5;
58 fftw_real tmp2;
59 fftw_real tmp4;
60 ASSERT_ALIGNED_DOUBLE;
61 tmp3 = c_re(inout[iostride]);
62 tmp5 = c_im(inout[iostride]);
63 tmp2 = c_re(W[0]);
64 tmp4 = c_im(W[0]);
65 tmp6 = (tmp2 * tmp3) + (tmp4 * tmp5);
66 tmp7 = (tmp2 * tmp5) - (tmp4 * tmp3);
67 }
68 c_re(inout[iostride]) = tmp1 - tmp6;
69 c_re(inout[0]) = tmp1 + tmp6;
70 c_im(inout[0]) = tmp7 + tmp8;
71 c_im(inout[iostride]) = tmp8 - tmp7;
72 }
73 }
74
75 static const int twiddle_order[] = { 1 };
76 fftw_codelet_desc fftwi_twiddle_2_desc = {
77 "fftwi_twiddle_2",
78 (void (*)()) fftwi_twiddle_2,
79 2,
80 FFTW_BACKWARD,
81 FFTW_TWIDDLE,
82 55,
83 1,
84 twiddle_order,
85 };
86