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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 <ports/fftw-int.h>
#include <ports/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 1.1.1.1 2002-03-29 14:12:57 pj Exp $
 * $Id: fhb_4.c,v 1.1.1.1 2002-03-29 14:12:57 pj Exp $
 * $Id: fhb_4.c,v 1.1.1.1 2002-03-29 14:12:57 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,
};