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2 | pj | 1 | /* |
2 | * Copyright (c) 1997-1999 Massachusetts Institute of Technology |
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3 | * |
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4 | * This program is free software; you can redistribute it and/or modify |
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5 | * it under the terms of the GNU General Public License as published by |
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6 | * the Free Software Foundation; either version 2 of the License, or |
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7 | * (at your option) any later version. |
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8 | * |
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9 | * This program is distributed in the hope that it will be useful, |
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10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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12 | * GNU General Public License for more details. |
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13 | * |
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14 | * You should have received a copy of the GNU General Public License |
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15 | * along with this program; if not, write to the Free Software |
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16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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17 | * |
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18 | */ |
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19 | |||
20 | /* This file was automatically generated --- DO NOT EDIT */ |
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21 | /* Generated on Tue May 18 13:54:33 EDT 1999 */ |
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22 | |||
23 | #include <ports/fftw-int.h> |
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24 | #include <ports/fftw.h> |
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25 | |||
26 | /* Generated by: ./genfft -magic-alignment-check -magic-twiddle-load-all -magic-variables 4 -magic-loopi -real2hc 3 */ |
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27 | |||
28 | /* |
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29 | * This function contains 4 FP additions, 2 FP multiplications, |
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30 | * (or, 3 additions, 1 multiplications, 1 fused multiply/add), |
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31 | * 4 stack variables, and 6 memory accesses |
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32 | */ |
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33 | static const fftw_real K866025403 = FFTW_KONST(+0.866025403784438646763723170752936183471402627); |
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34 | static const fftw_real K500000000 = FFTW_KONST(+0.500000000000000000000000000000000000000000000); |
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35 | |||
36 | /* |
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37 | * Generator Id's : |
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38 | * $Id: frc_3.c,v 1.1.1.1 2002-03-29 14:12:59 pj Exp $ |
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39 | * $Id: frc_3.c,v 1.1.1.1 2002-03-29 14:12:59 pj Exp $ |
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40 | * $Id: frc_3.c,v 1.1.1.1 2002-03-29 14:12:59 pj Exp $ |
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41 | */ |
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42 | |||
43 | void fftw_real2hc_3(const fftw_real *input, fftw_real *real_output, fftw_real *imag_output, int istride, int real_ostride, int imag_ostride) |
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44 | { |
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45 | fftw_real tmp1; |
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46 | fftw_real tmp2; |
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47 | fftw_real tmp3; |
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48 | fftw_real tmp4; |
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49 | ASSERT_ALIGNED_DOUBLE(); |
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50 | tmp1 = input[0]; |
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51 | tmp2 = input[istride]; |
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52 | tmp3 = input[2 * istride]; |
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53 | tmp4 = tmp2 + tmp3; |
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54 | real_output[real_ostride] = tmp1 - (K500000000 * tmp4); |
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55 | real_output[0] = tmp1 + tmp4; |
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56 | imag_output[imag_ostride] = K866025403 * (tmp3 - tmp2); |
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57 | } |
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58 | |||
59 | fftw_codelet_desc fftw_real2hc_3_desc = |
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60 | { |
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61 | "fftw_real2hc_3", |
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62 | (void (*)()) fftw_real2hc_3, |
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63 | 3, |
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64 | FFTW_FORWARD, |
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65 | FFTW_REAL2HC, |
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66 | 68, |
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67 | 0, |
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68 | (const int *) 0, |
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69 | }; |