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<h1>fft_1d.h</h1> </div>
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<a href="fft__1d_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* -------------------------------------------------------------- */</span>
<a name="l00002"></a>00002 <span class="comment">/* (C)Copyright 2001,2007, */</span>
<a name="l00003"></a>00003 <span class="comment">/* International Business Machines Corporation, */</span>
<a name="l00004"></a>00004 <span class="comment">/* Sony Computer Entertainment, Incorporated, */</span>
<a name="l00005"></a>00005 <span class="comment">/* Toshiba Corporation, */</span>
<a name="l00006"></a>00006 <span class="comment">/* */</span>
<a name="l00007"></a>00007 <span class="comment">/* All Rights Reserved. */</span>
<a name="l00008"></a>00008 <span class="comment">/* */</span>
<a name="l00009"></a>00009 <span class="comment">/* Redistribution and use in source and binary forms, with or */</span>
<a name="l00010"></a>00010 <span class="comment">/* without modification, are permitted provided that the */</span>
<a name="l00011"></a>00011 <span class="comment">/* following conditions are met: */</span>
<a name="l00012"></a>00012 <span class="comment">/* */</span>
<a name="l00013"></a>00013 <span class="comment">/* - Redistributions of source code must retain the above copyright*/</span>
<a name="l00014"></a>00014 <span class="comment">/* notice, this list of conditions and the following disclaimer. */</span>
<a name="l00015"></a>00015 <span class="comment">/* */</span>
<a name="l00016"></a>00016 <span class="comment">/* - Redistributions in binary form must reproduce the above */</span>
<a name="l00017"></a>00017 <span class="comment">/* copyright notice, this list of conditions and the following */</span>
<a name="l00018"></a>00018 <span class="comment">/* disclaimer in the documentation and/or other materials */</span>
<a name="l00019"></a>00019 <span class="comment">/* provided with the distribution. */</span>
<a name="l00020"></a>00020 <span class="comment">/* */</span>
<a name="l00021"></a>00021 <span class="comment">/* - Neither the name of IBM Corporation nor the names of its */</span>
<a name="l00022"></a>00022 <span class="comment">/* contributors may be used to endorse or promote products */</span>
<a name="l00023"></a>00023 <span class="comment">/* derived from this software without specific prior written */</span>
<a name="l00024"></a>00024 <span class="comment">/* permission. */</span>
<a name="l00025"></a>00025 <span class="comment">/* */</span>
<a name="l00026"></a>00026 <span class="comment">/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND */</span>
<a name="l00027"></a>00027 <span class="comment">/* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, */</span>
<a name="l00028"></a>00028 <span class="comment">/* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF */</span>
<a name="l00029"></a>00029 <span class="comment">/* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE */</span>
<a name="l00030"></a>00030 <span class="comment">/* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR */</span>
<a name="l00031"></a>00031 <span class="comment">/* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, */</span>
<a name="l00032"></a>00032 <span class="comment">/* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT */</span>
<a name="l00033"></a>00033 <span class="comment">/* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; */</span>
<a name="l00034"></a>00034 <span class="comment">/* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) */</span>
<a name="l00035"></a>00035 <span class="comment">/* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN */</span>
<a name="l00036"></a>00036 <span class="comment">/* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR */</span>
<a name="l00037"></a>00037 <span class="comment">/* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, */</span>
<a name="l00038"></a>00038 <span class="comment">/* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */</span>
<a name="l00039"></a>00039 <span class="comment">/* -------------------------------------------------------------- */</span>
<a name="l00040"></a>00040 <span class="comment">/* PROLOG END TAG zYx */</span>
<a name="l00041"></a>00041 <span class="preprocessor">#ifndef _FFT_1D_H_</span>
<a name="l00042"></a>00042 <span class="preprocessor"></span><span class="preprocessor">#define _FFT_1D_H_ 1</span>
<a name="l00043"></a>00043 <span class="preprocessor"></span>
<a name="l00044"></a>00044 <span class="preprocessor">#include <spu_intrinsics.h></span>
<a name="l00045"></a>00045
<a name="l00046"></a>00046 <span class="comment">/* BIT_SWAP - swaps up to 16 bits of the integer _i according to the </span>
<a name="l00047"></a>00047 <span class="comment"> * pattern specified by _pat.</span>
<a name="l00048"></a>00048 <span class="comment"> */</span>
<a name="l00049"></a><a class="code" href="fft__1d_8h.html#a67201f8863c0bd71426c8a0d87aef48a">00049</a> <span class="preprocessor">#define BIT_SWAP(_i, _pat) spu_extract(spu_gather(spu_shuffle(spu_maskb(_i), _pat, _pat)), 0)</span>
<a name="l00050"></a>00050 <span class="preprocessor"></span>
<a name="l00051"></a>00051
<a name="l00052"></a>00052 <span class="preprocessor">#ifndef MAX_FFT_1D_SIZE</span>
<a name="l00053"></a><a class="code" href="fft__1d_8h.html#a7e49143d089320690fd74371ce28048b">00053</a> <span class="preprocessor"></span><span class="preprocessor">#define MAX_FFT_1D_SIZE 8192</span>
<a name="l00054"></a>00054 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00055"></a>00055 <span class="preprocessor"></span>
<a name="l00056"></a>00056 <span class="preprocessor">#ifndef INV_SQRT_2</span>
<a name="l00057"></a><a class="code" href="fft__1d_8h.html#a00ce1546c572fa40f917142388f0c22a">00057</a> <span class="preprocessor"></span><span class="preprocessor">#define INV_SQRT_2 0.7071067811865</span>
<a name="l00058"></a>00058 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00059"></a>00059 <span class="preprocessor"></span>
<a name="l00060"></a>00060
<a name="l00061"></a>00061 <span class="comment">/* The following macro, FFT_1D_BUTTERFLY, performs a 4 way SIMD basic butterfly </span>
<a name="l00062"></a>00062 <span class="comment"> * operation. The inputs are in parallel arrays (seperate real and imaginary</span>
<a name="l00063"></a>00063 <span class="comment"> * vectors). </span>
<a name="l00064"></a>00064 <span class="comment"> * </span>
<a name="l00065"></a>00065 <span class="comment"> * p --------------------------> P = p + q*Wi</span>
<a name="l00066"></a>00066 <span class="comment"> * \ /</span>
<a name="l00067"></a>00067 <span class="comment"> * \ /</span>
<a name="l00068"></a>00068 <span class="comment"> * \ /</span>
<a name="l00069"></a>00069 <span class="comment"> * \/</span>
<a name="l00070"></a>00070 <span class="comment"> * /\</span>
<a name="l00071"></a>00071 <span class="comment"> * / \</span>
<a name="l00072"></a>00072 <span class="comment"> * / \</span>
<a name="l00073"></a>00073 <span class="comment"> * ____ / \</span>
<a name="l00074"></a>00074 <span class="comment"> * q --| Wi |-----------------> Q = p - q*Wi</span>
<a name="l00075"></a>00075 <span class="comment"> * ----</span>
<a name="l00076"></a>00076 <span class="comment"> */</span>
<a name="l00077"></a>00077
<a name="l00078"></a><a class="code" href="fft__1d_8h.html#a067eee2bb92825cd01fdb5c4df044c08">00078</a> <span class="preprocessor">#define FFT_1D_BUTTERFLY(_P_re, _P_im, _Q_re, _Q_im, _p_re, _p_im, _q_re, _q_im, _W_re, _W_im) { \</span>
<a name="l00079"></a>00079 <span class="preprocessor"> vector float _qw_re, _qw_im; \</span>
<a name="l00080"></a>00080 <span class="preprocessor"> \</span>
<a name="l00081"></a>00081 <span class="preprocessor"> _qw_re = spu_msub(_q_re, _W_re, spu_mul(_q_im, _W_im)); \</span>
<a name="l00082"></a>00082 <span class="preprocessor"> _qw_im = spu_madd(_q_re, _W_im, spu_mul(_q_im, _W_re)); \</span>
<a name="l00083"></a>00083 <span class="preprocessor"> _P_re = spu_add(_p_re, _qw_re); \</span>
<a name="l00084"></a>00084 <span class="preprocessor"> _P_im = spu_add(_p_im, _qw_im); \</span>
<a name="l00085"></a>00085 <span class="preprocessor"> _Q_re = spu_sub(_p_re, _qw_re); \</span>
<a name="l00086"></a>00086 <span class="preprocessor"> _Q_im = spu_sub(_p_im, _qw_im); \</span>
<a name="l00087"></a>00087 <span class="preprocessor">}</span>
<a name="l00088"></a>00088 <span class="preprocessor"></span>
<a name="l00089"></a>00089
<a name="l00090"></a>00090 <span class="comment">/* FFT_1D_BUTTERFLY_HI is equivalent to FFT_1D_BUTTERFLY with twiddle factors (W_im, -W_re)</span>
<a name="l00091"></a>00091 <span class="comment"> */</span>
<a name="l00092"></a><a class="code" href="fft__1d_8h.html#a5eaef4eb58f6867aec999d5d76355e39">00092</a> <span class="preprocessor">#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) { \</span>
<a name="l00093"></a>00093 <span class="preprocessor"> vector float _qw_re, _qw_im; \</span>
<a name="l00094"></a>00094 <span class="preprocessor"> \</span>
<a name="l00095"></a>00095 <span class="preprocessor"> _qw_re = spu_madd(_q_re, _W_im, spu_mul(_q_im, _W_re)); \</span>
<a name="l00096"></a>00096 <span class="preprocessor"> _qw_im = spu_msub(_q_im, _W_im, spu_mul(_q_re, _W_re)); \</span>
<a name="l00097"></a>00097 <span class="preprocessor"> _P_re = spu_add(_p_re, _qw_re); \</span>
<a name="l00098"></a>00098 <span class="preprocessor"> _P_im = spu_add(_p_im, _qw_im); \</span>
<a name="l00099"></a>00099 <span class="preprocessor"> _Q_re = spu_sub(_p_re, _qw_re); \</span>
<a name="l00100"></a>00100 <span class="preprocessor"> _Q_im = spu_sub(_p_im, _qw_im); \</span>
<a name="l00101"></a>00101 <span class="preprocessor">}</span>
<a name="l00102"></a>00102 <span class="preprocessor"></span>
<a name="l00103"></a>00103 <span class="preprocessor">#endif </span><span class="comment">/* _FFT_1D_H_ */</span>
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