ref: 4f9a9087f16b92662389be3dc0589629359ac8a4
dir: /libfaad/fftw/ftwi_3.c/
/*
* 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 Sun Nov 7 20:44:57 EST 1999 */
#include <fftw-int.h>
#include <fftw.h>
/* Generated by: ./genfft -magic-alignment-check -magic-twiddle-load-all -magic-variables 4 -magic-loopi -twiddleinv 3 */
/*
* This function contains 16 FP additions, 12 FP multiplications,
* (or, 10 additions, 6 multiplications, 6 fused multiply/add),
* 14 stack variables, and 12 memory accesses
*/
static const fftw_real K866025403 = FFTW_KONST(+0.866025403784438646763723170752936183471402627);
static const fftw_real K500000000 = FFTW_KONST(+0.500000000000000000000000000000000000000000000);
/*
* Generator Id's :
* $Id: ftwi_3.c,v 1.1 2002/04/07 21:26:05 menno Exp $
* $Id: ftwi_3.c,v 1.1 2002/04/07 21:26:05 menno Exp $
* $Id: ftwi_3.c,v 1.1 2002/04/07 21:26:05 menno Exp $
*/
void fftwi_twiddle_3(fftw_complex *A, const fftw_complex *W, int iostride, int m, int dist)
{
int i;
fftw_complex *inout;
inout = A;
for (i = m; i > 0; i = i - 1, inout = inout + dist, W = W + 2) {
fftw_real tmp1;
fftw_real tmp18;
fftw_real tmp6;
fftw_real tmp15;
fftw_real tmp11;
fftw_real tmp14;
fftw_real tmp12;
fftw_real tmp17;
ASSERT_ALIGNED_DOUBLE;
tmp1 = c_re(inout[0]);
tmp18 = c_im(inout[0]);
{
fftw_real tmp3;
fftw_real tmp5;
fftw_real tmp2;
fftw_real tmp4;
ASSERT_ALIGNED_DOUBLE;
tmp3 = c_re(inout[iostride]);
tmp5 = c_im(inout[iostride]);
tmp2 = c_re(W[0]);
tmp4 = c_im(W[0]);
tmp6 = (tmp2 * tmp3) + (tmp4 * tmp5);
tmp15 = (tmp2 * tmp5) - (tmp4 * tmp3);
}
{
fftw_real tmp8;
fftw_real tmp10;
fftw_real tmp7;
fftw_real tmp9;
ASSERT_ALIGNED_DOUBLE;
tmp8 = c_re(inout[2 * iostride]);
tmp10 = c_im(inout[2 * iostride]);
tmp7 = c_re(W[1]);
tmp9 = c_im(W[1]);
tmp11 = (tmp7 * tmp8) + (tmp9 * tmp10);
tmp14 = (tmp7 * tmp10) - (tmp9 * tmp8);
}
tmp12 = tmp6 + tmp11;
tmp17 = tmp15 + tmp14;
{
fftw_real tmp13;
fftw_real tmp16;
fftw_real tmp19;
fftw_real tmp20;
ASSERT_ALIGNED_DOUBLE;
c_re(inout[0]) = tmp1 + tmp12;
tmp13 = tmp1 - (K500000000 * tmp12);
tmp16 = K866025403 * (tmp14 - tmp15);
c_re(inout[2 * iostride]) = tmp13 - tmp16;
c_re(inout[iostride]) = tmp13 + tmp16;
c_im(inout[0]) = tmp17 + tmp18;
tmp19 = K866025403 * (tmp6 - tmp11);
tmp20 = tmp18 - (K500000000 * tmp17);
c_im(inout[iostride]) = tmp19 + tmp20;
c_im(inout[2 * iostride]) = tmp20 - tmp19;
}
}
}
static const int twiddle_order[] =
{1, 2};
fftw_codelet_desc fftwi_twiddle_3_desc =
{
"fftwi_twiddle_3",
(void (*)()) fftwi_twiddle_3,
3,
FFTW_BACKWARD,
FFTW_TWIDDLE,
77,
2,
twiddle_order,
};