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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 4 */
/*
* This function contains 34 FP additions, 18 FP multiplications,
* (or, 28 additions, 12 multiplications, 6 fused multiply/add),
* 15 stack variables, and 32 memory accesses
*/
static const fftw_real K1_414213562 = FFTW_KONST(+1.414213562373095048801688724209698078569671875);
static const fftw_real K2_000000000 = FFTW_KONST(+2.000000000000000000000000000000000000000000000);
/*
* Generator Id's :
* $Id: fhb_4.c,v 1.2 2003-03-24 11:14:57 pj Exp $
* $Id: fhb_4.c,v 1.2 2003-03-24 11:14:57 pj Exp $
* $Id: fhb_4.c,v 1.2 2003-03-24 11:14:57 pj Exp $
*/
void fftw_hc2hc_backward_4(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 + (4 * iostride);
{
fftw_real tmp39;
fftw_real tmp42;
fftw_real tmp37;
fftw_real tmp40;
ASSERT_ALIGNED_DOUBLE();
{
fftw_real tmp38;
fftw_real tmp41;
fftw_real tmp35;
fftw_real tmp36;
ASSERT_ALIGNED_DOUBLE();
tmp38 = X[iostride];
tmp39 = K2_000000000 * tmp38;
tmp41 = Y[-iostride];
tmp42 = K2_000000000 * tmp41;
tmp35 = X[0];
tmp36 = X[2 * iostride];
tmp37 = tmp35 + tmp36;
tmp40 = tmp35 - tmp36;
}
X[2 * iostride] = tmp37 - tmp39;
X[0] = tmp37 + tmp39;
X[3 * iostride] = tmp40 + tmp42;
X[iostride] = tmp40 - tmp42;
}
X = X + dist;
Y = Y - dist;
for (i = 2; i < m; i = i + 2, X = X + dist, Y = Y - dist, W = W + 3) {
fftw_real tmp9;
fftw_real tmp28;
fftw_real tmp18;
fftw_real tmp25;
fftw_real tmp12;
fftw_real tmp24;
fftw_real tmp21;
fftw_real tmp29;
ASSERT_ALIGNED_DOUBLE();
{
fftw_real tmp7;
fftw_real tmp8;
fftw_real tmp16;
fftw_real tmp17;
ASSERT_ALIGNED_DOUBLE();
tmp7 = X[0];
tmp8 = Y[-2 * iostride];
tmp9 = tmp7 + tmp8;
tmp28 = tmp7 - tmp8;
tmp16 = Y[0];
tmp17 = X[2 * iostride];
tmp18 = tmp16 - tmp17;
tmp25 = tmp16 + tmp17;
}
{
fftw_real tmp10;
fftw_real tmp11;
fftw_real tmp19;
fftw_real tmp20;
ASSERT_ALIGNED_DOUBLE();
tmp10 = X[iostride];
tmp11 = Y[-3 * iostride];
tmp12 = tmp10 + tmp11;
tmp24 = tmp10 - tmp11;
tmp19 = Y[-iostride];
tmp20 = X[3 * iostride];
tmp21 = tmp19 - tmp20;
tmp29 = tmp19 + tmp20;
}
X[0] = tmp9 + tmp12;
{
fftw_real tmp14;
fftw_real tmp22;
fftw_real tmp13;
fftw_real tmp15;
ASSERT_ALIGNED_DOUBLE();
tmp14 = tmp9 - tmp12;
tmp22 = tmp18 - tmp21;
tmp13 = c_re(W[1]);
tmp15 = c_im(W[1]);
X[2 * iostride] = (tmp13 * tmp14) + (tmp15 * tmp22);
Y[-iostride] = (tmp13 * tmp22) - (tmp15 * tmp14);
}
Y[-3 * iostride] = tmp18 + tmp21;
{
fftw_real tmp26;
fftw_real tmp30;
fftw_real tmp23;
fftw_real tmp27;
ASSERT_ALIGNED_DOUBLE();
tmp26 = tmp24 + tmp25;
tmp30 = tmp28 - tmp29;
tmp23 = c_re(W[0]);
tmp27 = c_im(W[0]);
Y[-2 * iostride] = (tmp23 * tmp26) - (tmp27 * tmp30);
X[iostride] = (tmp27 * tmp26) + (tmp23 * tmp30);
}
{
fftw_real tmp32;
fftw_real tmp34;
fftw_real tmp31;
fftw_real tmp33;
ASSERT_ALIGNED_DOUBLE();
tmp32 = tmp25 - tmp24;
tmp34 = tmp28 + tmp29;
tmp31 = c_re(W[2]);
tmp33 = c_im(W[2]);
Y[0] = (tmp31 * tmp32) - (tmp33 * tmp34);
X[3 * iostride] = (tmp33 * tmp32) + (tmp31 * tmp34);
}
}
if (i == m) {
fftw_real tmp1;
fftw_real tmp2;
fftw_real tmp3;
fftw_real tmp4;
fftw_real tmp5;
fftw_real tmp6;
ASSERT_ALIGNED_DOUBLE();
tmp1 = X[0];
tmp2 = X[iostride];
tmp3 = tmp1 - tmp2;
tmp4 = Y[0];
tmp5 = Y[-iostride];
tmp6 = tmp4 + tmp5;
X[0] = K2_000000000 * (tmp1 + tmp2);
X[2 * iostride] = -(K2_000000000 * (tmp4 - tmp5));
X[iostride] = K1_414213562 * (tmp3 - tmp6);
X[3 * iostride] = -(K1_414213562 * (tmp3 + tmp6));
}
}
static const int twiddle_order[] =
{1, 2, 3};
fftw_codelet_desc fftw_hc2hc_backward_4_desc =
{
"fftw_hc2hc_backward_4",
(void (*)()) fftw_hc2hc_backward_4,
4,
FFTW_BACKWARD,
FFTW_HC2HC,
102,
3,
twiddle_order,
};