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/*
* Copyright (c) 2001 Matteo Frigo
* Copyright (c) 2001 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
*
*/
#include "bench.h"
/* FFT routine used for calibratin the timer */
#define WS(a, b) a * b
void bench_fft8(const float *ri, const float *ii, float *ro, float *io,
int is, int os)
{
const float KP707106781 = 0.707106781186547524400844362104849039284835938;
float T3, Tn, Ti, TC, T6, TB, Tl, To, Td, TN, Tz, TH, Ta, TM, Tu;
float TG;
{
float T1, T2, Tj, Tk;
T1 = ri[0];
T2 = ri[WS(is, 4)];
T3 = T1 + T2;
Tn = T1 - T2;
{
float Tg, Th, T4, T5;
Tg = ii[0];
Th = ii[WS(is, 4)];
Ti = Tg + Th;
TC = Tg - Th;
T4 = ri[WS(is, 2)];
T5 = ri[WS(is, 6)];
T6 = T4 + T5;
TB = T4 - T5;
}
Tj = ii[WS(is, 2)];
Tk = ii[WS(is, 6)];
Tl = Tj + Tk;
To = Tj - Tk;
{
float Tb, Tc, Tv, Tw, Tx, Ty;
Tb = ri[WS(is, 7)];
Tc = ri[WS(is, 3)];
Tv = Tb - Tc;
Tw = ii[WS(is, 7)];
Tx = ii[WS(is, 3)];
Ty = Tw - Tx;
Td = Tb + Tc;
TN = Tw + Tx;
Tz = Tv - Ty;
TH = Tv + Ty;
}
{
float T8, T9, Tq, Tr, Ts, Tt;
T8 = ri[WS(is, 1)];
T9 = ri[WS(is, 5)];
Tq = T8 - T9;
Tr = ii[WS(is, 1)];
Ts = ii[WS(is, 5)];
Tt = Tr - Ts;
Ta = T8 + T9;
TM = Tr + Ts;
Tu = Tq + Tt;
TG = Tt - Tq;
}
}
{
float T7, Te, TP, TQ;
T7 = T3 + T6;
Te = Ta + Td;
ro[WS(os, 4)] = T7 - Te;
ro[0] = T7 + Te;
TP = Ti + Tl;
TQ = TM + TN;
io[WS(os, 4)] = TP - TQ;
io[0] = TP + TQ;
}
{
float Tf, Tm, TL, TO;
Tf = Td - Ta;
Tm = Ti - Tl;
io[WS(os, 2)] = Tf + Tm;
io[WS(os, 6)] = Tm - Tf;
TL = T3 - T6;
TO = TM - TN;
ro[WS(os, 6)] = TL - TO;
ro[WS(os, 2)] = TL + TO;
}
{
float Tp, TA, TJ, TK;
Tp = Tn + To;
TA = KP707106781 * (Tu + Tz);
ro[WS(os, 5)] = Tp - TA;
ro[WS(os, 1)] = Tp + TA;
TJ = TC - TB;
TK = KP707106781 * (TG + TH);
io[WS(os, 5)] = TJ - TK;
io[WS(os, 1)] = TJ + TK;
}
{
float TD, TE, TF, TI;
TD = TB + TC;
TE = KP707106781 * (Tz - Tu);
io[WS(os, 7)] = TD - TE;
io[WS(os, 3)] = TD + TE;
TF = Tn - To;
TI = KP707106781 * (TG - TH);
ro[WS(os, 7)] = TF - TI;
ro[WS(os, 3)] = TF + TI;
}
}
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