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| Rev | Author | Line No. | Line |
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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 | |||
| 107 | pj | 23 | #include <fftw-int.h> |
| 24 | #include <fftw.h> |
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| 2 | pj | 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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| 107 | pj | 38 | * $Id: frc_3.c,v 1.2 2003-03-24 11:14:59 pj Exp $ |
| 39 | * $Id: frc_3.c,v 1.2 2003-03-24 11:14:59 pj Exp $ |
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| 40 | * $Id: frc_3.c,v 1.2 2003-03-24 11:14:59 pj Exp $ |
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| 2 | pj | 41 | */ |
| 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 | }; |