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Viewing changes to gcell/include/gcell/spu/fft_1d.h

  • Committer: Bazaar Package Importer
  • Author(s): Kamal Mostafa
  • Date: 2010-03-13 07:46:01 UTC
  • mfrom: (2.1.2 sid)
  • Revision ID: james.westby@ubuntu.com-20100313074601-zjsa893a87bozyh7
Tags: 3.2.2.dfsg-1ubuntu1
https://launchpad.net/bugs/260406
* Fix build for Ubuntu lucid (LP: #260406)
  - add binary package dep for libusrp0, libusrp2-0: adduser
  - debian/rules clean: remove pre-built Qt moc files

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gcell/include/gcell/spu/fft_1d.h
 
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/* --------------------------------------------------------------  */
 
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/* (C)Copyright 2001,2007,                                         */
 
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/* International Business Machines Corporation,                    */
 
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/* Sony Computer Entertainment, Incorporated,                      */
 
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/* Toshiba Corporation,                                            */
 
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/*                                                                 */
 
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/* All Rights Reserved.                                            */
 
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/*                                                                 */
 
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/* Redistribution and use in source and binary forms, with or      */
 
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/* without modification, are permitted provided that the           */
 
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/* following conditions are met:                                   */
 
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/*                                                                 */
 
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/* - Redistributions of source code must retain the above copyright*/
 
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/*   notice, this list of conditions and the following disclaimer. */
 
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/*                                                                 */
 
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/* - Redistributions in binary form must reproduce the above       */
 
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/*   copyright notice, this list of conditions and the following   */
 
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/*   disclaimer in the documentation and/or other materials        */
 
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/*   provided with the distribution.                               */
 
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/*                                                                 */
 
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/* - Neither the name of IBM Corporation nor the names of its      */
 
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/*   contributors may be used to endorse or promote products       */
 
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/*   derived from this software without specific prior written     */
 
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/*   permission.                                                   */
 
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/*                                                                 */
 
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/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND          */
 
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/* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,     */
 
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/* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF        */
 
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/* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE        */
 
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/* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR            */
 
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/* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,    */
 
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/* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT    */
 
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/* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;    */
 
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/* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)        */
 
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/* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN       */
 
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/* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR    */
 
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/* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,  */
 
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/* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.              */
 
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/* --------------------------------------------------------------  */
 
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/* PROLOG END TAG zYx                                              */
 
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#ifndef _FFT_1D_H_
 
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#define _FFT_1D_H_      1
 
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#include <spu_intrinsics.h>
 
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/* BIT_SWAP - swaps up to 16 bits of the integer _i according to the 
 
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 *            pattern specified by _pat.
 
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 */
 
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#define BIT_SWAP(_i, _pat)        spu_extract(spu_gather(spu_shuffle(spu_maskb(_i), _pat, _pat)), 0)
 
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#ifndef MAX_FFT_1D_SIZE
 
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#define MAX_FFT_1D_SIZE 8192
 
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#endif
 
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#ifndef INV_SQRT_2
 
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#define INV_SQRT_2      0.7071067811865
 
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#endif
 
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/* The following macro, FFT_1D_BUTTERFLY, performs a 4 way SIMD basic butterfly 
 
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 * operation. The inputs are in parallel arrays (seperate real and imaginary
 
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 * vectors). 
 
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 * 
 
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 *          p --------------------------> P = p + q*Wi
 
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 *                        \      /
 
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 *                         \    /
 
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 *                          \  /
 
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 *                           \/
 
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 *                           /\
 
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 *                          /  \
 
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 *                         /    \
 
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 *               ____     /      \
 
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 *          q --| Wi |-----------------> Q = p - q*Wi
 
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 *               ----
 
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 */
 
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#define FFT_1D_BUTTERFLY(_P_re, _P_im, _Q_re, _Q_im, _p_re, _p_im, _q_re, _q_im, _W_re, _W_im) {        \
 
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  vector float _qw_re, _qw_im;                                                                          \
 
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                                                                                                        \
 
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  _qw_re = spu_msub(_q_re, _W_re, spu_mul(_q_im, _W_im));                                               \
 
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  _qw_im = spu_madd(_q_re, _W_im, spu_mul(_q_im, _W_re));                                               \
 
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  _P_re  = spu_add(_p_re, _qw_re);                                                                      \
 
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  _P_im  = spu_add(_p_im, _qw_im);                                                                      \
 
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  _Q_re  = spu_sub(_p_re, _qw_re);                                                                      \
 
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  _Q_im  = spu_sub(_p_im, _qw_im);                                                                      \
 
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}
 
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/* FFT_1D_BUTTERFLY_HI is equivalent to FFT_1D_BUTTERFLY with twiddle factors (W_im, -W_re)
 
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 */
 
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#define FFT_1D_BUTTERFLY_HI(_P_re, _P_im, _Q_re, _Q_im, _p_re, _p_im, _q_re, _q_im, _W_re, _W_im) {     \
 
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  vector float _qw_re, _qw_im;                                                                          \
 
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                                                                                                        \
 
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  _qw_re = spu_madd(_q_re, _W_im, spu_mul(_q_im, _W_re));                                               \
 
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  _qw_im = spu_msub(_q_im, _W_im, spu_mul(_q_re, _W_re));                                               \
 
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  _P_re  = spu_add(_p_re, _qw_re);                                                                      \
 
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  _P_im  = spu_add(_p_im, _qw_im);                                                                      \
 
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  _Q_re  = spu_sub(_p_re, _qw_re);                                                                      \
 
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  _Q_im  = spu_sub(_p_im, _qw_im);                                                                      \
 
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}
 
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#endif /* _FFT_1D_H_ */