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/*
* Copyright (c) 1997-1999 Massachusetts Institute of Technology
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
/* This file was automatically generated --- DO NOT EDIT */
/* Generated on Tue May 18 13:55:58 EDT 1999 */
#include <fftw-int.h>
#include <fftw.h>
/* Generated by: ./genfft -magic-alignment-check -magic-twiddle-load-all -magic-variables 4 -magic-loopi -hc2hc-backward 3 */
/*
* This function contains 24 FP additions, 16 FP multiplications,
* (or, 16 additions, 8 multiplications, 8 fused multiply/add),
* 15 stack variables, and 24 memory accesses
*/
static const fftw_real K500000000 = FFTW_KONST(+0.500000000000000000000000000000000000000000000);
static const fftw_real K866025403 = FFTW_KONST(+0.866025403784438646763723170752936183471402627);
static const fftw_real K2_000000000 = FFTW_KONST(+2.000000000000000000000000000000000000000000000);
static const fftw_real K1_732050807 = FFTW_KONST(+1.732050807568877293527446341505872366942805254);
/*
* Generator Id's :
* $Id: fhb_3.c,v 1.2 2003-03-24 11:14:56 pj Exp $
* $Id: fhb_3.c,v 1.2 2003-03-24 11:14:56 pj Exp $
* $Id: fhb_3.c,v 1.2 2003-03-24 11:14:56 pj Exp $
*/
void fftw_hc2hc_backward_3(fftw_real *A, const fftw_complex *W, int iostride, int m, int dist)
{
int i;
fftw_real *X;
fftw_real *Y;
X = A;
Y = A + (3 * iostride);
{
fftw_real tmp30;
fftw_real tmp26;
fftw_real tmp27;
fftw_real tmp28;
fftw_real tmp29;
ASSERT_ALIGNED_DOUBLE();
tmp29 = Y[-iostride];
tmp30 = K1_732050807 * tmp29;
tmp26 = X[0];
tmp27 = X[iostride];
tmp28 = tmp26 - tmp27;
X[0] = tmp26 + (K2_000000000 * tmp27);
X[iostride] = tmp28 - tmp30;
X[2 * iostride] = tmp28 + tmp30;
}
X = X + dist;
Y = Y - dist;
for (i = 2; i < m; i = i + 2, X = X + dist, Y = Y - dist, W = W + 2) {
fftw_real tmp6;
fftw_real tmp9;
fftw_real tmp15;
fftw_real tmp19;
fftw_real tmp10;
fftw_real tmp13;
fftw_real tmp16;
fftw_real tmp20;
ASSERT_ALIGNED_DOUBLE();
{
fftw_real tmp7;
fftw_real tmp8;
fftw_real tmp11;
fftw_real tmp12;
ASSERT_ALIGNED_DOUBLE();
tmp6 = X[0];
tmp7 = X[iostride];
tmp8 = Y[-2 * iostride];
tmp9 = tmp7 + tmp8;
tmp15 = K866025403 * (tmp7 - tmp8);
tmp19 = tmp6 - (K500000000 * tmp9);
tmp10 = Y[0];
tmp11 = Y[-iostride];
tmp12 = X[2 * iostride];
tmp13 = tmp11 - tmp12;
tmp16 = tmp10 - (K500000000 * tmp13);
tmp20 = K866025403 * (tmp11 + tmp12);
}
X[0] = tmp6 + tmp9;
{
fftw_real tmp23;
fftw_real tmp25;
fftw_real tmp22;
fftw_real tmp24;
ASSERT_ALIGNED_DOUBLE();
tmp23 = tmp16 - tmp15;
tmp25 = tmp19 + tmp20;
tmp22 = c_re(W[1]);
tmp24 = c_im(W[1]);
Y[0] = (tmp22 * tmp23) - (tmp24 * tmp25);
X[2 * iostride] = (tmp24 * tmp23) + (tmp22 * tmp25);
}
Y[-2 * iostride] = tmp10 + tmp13;
{
fftw_real tmp17;
fftw_real tmp21;
fftw_real tmp14;
fftw_real tmp18;
ASSERT_ALIGNED_DOUBLE();
tmp17 = tmp15 + tmp16;
tmp21 = tmp19 - tmp20;
tmp14 = c_re(W[0]);
tmp18 = c_im(W[0]);
Y[-iostride] = (tmp14 * tmp17) - (tmp18 * tmp21);
X[iostride] = (tmp18 * tmp17) + (tmp14 * tmp21);
}
}
if (i == m) {
fftw_real tmp5;
fftw_real tmp1;
fftw_real tmp2;
fftw_real tmp3;
fftw_real tmp4;
ASSERT_ALIGNED_DOUBLE();
tmp4 = Y[0];
tmp5 = K1_732050807 * tmp4;
tmp1 = X[iostride];
tmp2 = X[0];
tmp3 = tmp2 - tmp1;
X[0] = tmp1 + (K2_000000000 * tmp2);
X[2 * iostride] = -(tmp3 + tmp5);
X[iostride] = tmp3 - tmp5;
}
}
static const int twiddle_order[] =
{1, 2};
fftw_codelet_desc fftw_hc2hc_backward_3_desc =
{
"fftw_hc2hc_backward_3",
(void (*)()) fftw_hc2hc_backward_3,
3,
FFTW_BACKWARD,
FFTW_HC2HC,
80,
2,
twiddle_order,
};