| <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> |
| <html xmlns="http://www.w3.org/1999/xhtml"> |
| <head> |
| <meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/> |
| <title>CMSIS DSP Software Library: arm_conv_fast_q31.c Source File</title> |
| <link href="tabs.css" rel="stylesheet" type="text/css"/> |
| <link href="search/search.css" rel="stylesheet" type="text/css"/> |
| <script type="text/javaScript" src="search/search.js"></script> |
| <link href="doxygen.css" rel="stylesheet" type="text/css"/> |
| </head> |
| <body onload='searchBox.OnSelectItem(0);'> |
| <!-- Generated by Doxygen 1.7.2 --> |
| <script type="text/javascript"><!-- |
| var searchBox = new SearchBox("searchBox", "search",false,'Search'); |
| --></script> |
| <div class="navigation" id="top"> |
| <div class="tabs"> |
| <ul class="tablist"> |
| <li><a href="index.html"><span>Main Page</span></a></li> |
| <li><a href="modules.html"><span>Modules</span></a></li> |
| <li><a href="annotated.html"><span>Data Structures</span></a></li> |
| <li class="current"><a href="files.html"><span>Files</span></a></li> |
| <li><a href="examples.html"><span>Examples</span></a></li> |
| <li id="searchli"> |
| <div id="MSearchBox" class="MSearchBoxInactive"> |
| <span class="left"> |
| <img id="MSearchSelect" src="search/mag_sel.png" |
| onmouseover="return searchBox.OnSearchSelectShow()" |
| onmouseout="return searchBox.OnSearchSelectHide()" |
| alt=""/> |
| <input type="text" id="MSearchField" value="Search" accesskey="S" |
| onfocus="searchBox.OnSearchFieldFocus(true)" |
| onblur="searchBox.OnSearchFieldFocus(false)" |
| onkeyup="searchBox.OnSearchFieldChange(event)"/> |
| </span><span class="right"> |
| <a id="MSearchClose" href="javascript:searchBox.CloseResultsWindow()"><img id="MSearchCloseImg" border="0" src="search/close.png" alt=""/></a> |
| </span> |
| </div> |
| </li> |
| </ul> |
| </div> |
| <div class="tabs2"> |
| <ul class="tablist"> |
| <li><a href="files.html"><span>File List</span></a></li> |
| <li><a href="globals.html"><span>Globals</span></a></li> |
| </ul> |
| </div> |
| <div class="header"> |
| <div class="headertitle"> |
| <h1>arm_conv_fast_q31.c</h1> </div> |
| </div> |
| <div class="contents"> |
| <a href="arm__conv__fast__q31_8c.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">* Copyright (C) 2010 ARM Limited. All rights reserved. </span> |
| <a name="l00003"></a>00003 <span class="comment">* </span> |
| <a name="l00004"></a>00004 <span class="comment">* $Date: 15. July 2011 </span> |
| <a name="l00005"></a>00005 <span class="comment">* $Revision: V1.0.10 </span> |
| <a name="l00006"></a>00006 <span class="comment">* </span> |
| <a name="l00007"></a>00007 <span class="comment">* Project: CMSIS DSP Library </span> |
| <a name="l00008"></a>00008 <span class="comment">* Title: arm_conv_fast_q31.c </span> |
| <a name="l00009"></a>00009 <span class="comment">* </span> |
| <a name="l00010"></a>00010 <span class="comment">* Description: Q31 Convolution (fast version). </span> |
| <a name="l00011"></a>00011 <span class="comment">* </span> |
| <a name="l00012"></a>00012 <span class="comment">* Target Processor: Cortex-M4/Cortex-M3</span> |
| <a name="l00013"></a>00013 <span class="comment">* </span> |
| <a name="l00014"></a>00014 <span class="comment">* Version 1.0.10 2011/7/15 </span> |
| <a name="l00015"></a>00015 <span class="comment">* Big Endian support added and Merged M0 and M3/M4 Source code. </span> |
| <a name="l00016"></a>00016 <span class="comment">* </span> |
| <a name="l00017"></a>00017 <span class="comment">* Version 1.0.3 2010/11/29 </span> |
| <a name="l00018"></a>00018 <span class="comment">* Re-organized the CMSIS folders and updated documentation. </span> |
| <a name="l00019"></a>00019 <span class="comment">* </span> |
| <a name="l00020"></a>00020 <span class="comment">* Version 1.0.2 2010/11/11 </span> |
| <a name="l00021"></a>00021 <span class="comment">* Documentation updated. </span> |
| <a name="l00022"></a>00022 <span class="comment">* </span> |
| <a name="l00023"></a>00023 <span class="comment">* Version 1.0.1 2010/10/05 </span> |
| <a name="l00024"></a>00024 <span class="comment">* Production release and review comments incorporated. </span> |
| <a name="l00025"></a>00025 <span class="comment">* </span> |
| <a name="l00026"></a>00026 <span class="comment">* Version 1.0.0 2010/09/20 </span> |
| <a name="l00027"></a>00027 <span class="comment">* Production release and review comments incorporated. </span> |
| <a name="l00028"></a>00028 <span class="comment">* -------------------------------------------------------------------- */</span> |
| <a name="l00029"></a>00029 |
| <a name="l00030"></a>00030 <span class="preprocessor">#include "<a class="code" href="arm__math_8h.html">arm_math.h</a>"</span> |
| <a name="l00031"></a>00031 |
| <a name="l00068"></a><a class="code" href="group___conv.html#ga51112dcdf9b3624eb05182cdc4da9ec0">00068</a> <span class="keywordtype">void</span> <a class="code" href="group___conv.html#ga51112dcdf9b3624eb05182cdc4da9ec0" title="Convolution of Q31 sequences (fast version) for Cortex-M3 and Cortex-M4.">arm_conv_fast_q31</a>( |
| <a name="l00069"></a>00069 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> * pSrcA, |
| <a name="l00070"></a>00070 uint32_t <a class="code" href="arm__convolution__example__f32_8c.html#ace48ed566e2cd6a680f0681192e6af28">srcALen</a>, |
| <a name="l00071"></a>00071 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> * pSrcB, |
| <a name="l00072"></a>00072 uint32_t <a class="code" href="arm__convolution__example__f32_8c.html#aea71286f498978c5ed3775609b974fc8">srcBLen</a>, |
| <a name="l00073"></a>00073 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> * pDst) |
| <a name="l00074"></a>00074 { |
| <a name="l00075"></a>00075 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> *pIn1; <span class="comment">/* inputA pointer */</span> |
| <a name="l00076"></a>00076 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> *pIn2; <span class="comment">/* inputB pointer */</span> |
| <a name="l00077"></a>00077 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> *pOut = pDst; <span class="comment">/* output pointer */</span> |
| <a name="l00078"></a>00078 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> *px; <span class="comment">/* Intermediate inputA pointer */</span> |
| <a name="l00079"></a>00079 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> *py; <span class="comment">/* Intermediate inputB pointer */</span> |
| <a name="l00080"></a>00080 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> *pSrc1, *pSrc2; <span class="comment">/* Intermediate pointers */</span> |
| <a name="l00081"></a>00081 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> sum, acc0, acc1, acc2, acc3; <span class="comment">/* Accumulator */</span> |
| <a name="l00082"></a>00082 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> x0, x1, x2, x3, c0; <span class="comment">/* Temporary variables to hold state and coefficient values */</span> |
| <a name="l00083"></a>00083 uint32_t j, k, count, blkCnt, blockSize1, blockSize2, blockSize3; <span class="comment">/* loop counter */</span> |
| <a name="l00084"></a>00084 |
| <a name="l00085"></a>00085 |
| <a name="l00086"></a>00086 <span class="comment">/* The algorithm implementation is based on the lengths of the inputs. */</span> |
| <a name="l00087"></a>00087 <span class="comment">/* srcB is always made to slide across srcA. */</span> |
| <a name="l00088"></a>00088 <span class="comment">/* So srcBLen is always considered as shorter or equal to srcALen */</span> |
| <a name="l00089"></a>00089 <span class="keywordflow">if</span>(srcALen >= srcBLen) |
| <a name="l00090"></a>00090 { |
| <a name="l00091"></a>00091 <span class="comment">/* Initialization of inputA pointer */</span> |
| <a name="l00092"></a>00092 pIn1 = pSrcA; |
| <a name="l00093"></a>00093 |
| <a name="l00094"></a>00094 <span class="comment">/* Initialization of inputB pointer */</span> |
| <a name="l00095"></a>00095 pIn2 = pSrcB; |
| <a name="l00096"></a>00096 } |
| <a name="l00097"></a>00097 <span class="keywordflow">else</span> |
| <a name="l00098"></a>00098 { |
| <a name="l00099"></a>00099 <span class="comment">/* Initialization of inputA pointer */</span> |
| <a name="l00100"></a>00100 pIn1 = pSrcB; |
| <a name="l00101"></a>00101 |
| <a name="l00102"></a>00102 <span class="comment">/* Initialization of inputB pointer */</span> |
| <a name="l00103"></a>00103 pIn2 = pSrcA; |
| <a name="l00104"></a>00104 |
| <a name="l00105"></a>00105 <span class="comment">/* srcBLen is always considered as shorter or equal to srcALen */</span> |
| <a name="l00106"></a>00106 j = <a class="code" href="arm__convolution__example__f32_8c.html#aea71286f498978c5ed3775609b974fc8">srcBLen</a>; |
| <a name="l00107"></a>00107 srcBLen = <a class="code" href="arm__convolution__example__f32_8c.html#ace48ed566e2cd6a680f0681192e6af28">srcALen</a>; |
| <a name="l00108"></a>00108 srcALen = j; |
| <a name="l00109"></a>00109 } |
| <a name="l00110"></a>00110 |
| <a name="l00111"></a>00111 <span class="comment">/* conv(x,y) at n = x[n] * y[0] + x[n-1] * y[1] + x[n-2] * y[2] + ...+ x[n-N+1] * y[N -1] */</span> |
| <a name="l00112"></a>00112 <span class="comment">/* The function is internally </span> |
| <a name="l00113"></a>00113 <span class="comment"> * divided into three stages according to the number of multiplications that has to be </span> |
| <a name="l00114"></a>00114 <span class="comment"> * taken place between inputA samples and inputB samples. In the first stage of the </span> |
| <a name="l00115"></a>00115 <span class="comment"> * algorithm, the multiplications increase by one for every iteration. </span> |
| <a name="l00116"></a>00116 <span class="comment"> * In the second stage of the algorithm, srcBLen number of multiplications are done. </span> |
| <a name="l00117"></a>00117 <span class="comment"> * In the third stage of the algorithm, the multiplications decrease by one </span> |
| <a name="l00118"></a>00118 <span class="comment"> * for every iteration. */</span> |
| <a name="l00119"></a>00119 |
| <a name="l00120"></a>00120 <span class="comment">/* The algorithm is implemented in three stages. </span> |
| <a name="l00121"></a>00121 <span class="comment"> The loop counters of each stage is initiated here. */</span> |
| <a name="l00122"></a>00122 blockSize1 = srcBLen - 1u; |
| <a name="l00123"></a>00123 blockSize2 = srcALen - (srcBLen - 1u); |
| <a name="l00124"></a>00124 blockSize3 = blockSize1; |
| <a name="l00125"></a>00125 |
| <a name="l00126"></a>00126 <span class="comment">/* -------------------------- </span> |
| <a name="l00127"></a>00127 <span class="comment"> * Initializations of stage1 </span> |
| <a name="l00128"></a>00128 <span class="comment"> * -------------------------*/</span> |
| <a name="l00129"></a>00129 |
| <a name="l00130"></a>00130 <span class="comment">/* sum = x[0] * y[0] </span> |
| <a name="l00131"></a>00131 <span class="comment"> * sum = x[0] * y[1] + x[1] * y[0] </span> |
| <a name="l00132"></a>00132 <span class="comment"> * .... </span> |
| <a name="l00133"></a>00133 <span class="comment"> * sum = x[0] * y[srcBlen - 1] + x[1] * y[srcBlen - 2] +...+ x[srcBLen - 1] * y[0] </span> |
| <a name="l00134"></a>00134 <span class="comment"> */</span> |
| <a name="l00135"></a>00135 |
| <a name="l00136"></a>00136 <span class="comment">/* In this stage the MAC operations are increased by 1 for every iteration. </span> |
| <a name="l00137"></a>00137 <span class="comment"> The count variable holds the number of MAC operations performed */</span> |
| <a name="l00138"></a>00138 count = 1u; |
| <a name="l00139"></a>00139 |
| <a name="l00140"></a>00140 <span class="comment">/* Working pointer of inputA */</span> |
| <a name="l00141"></a>00141 px = pIn1; |
| <a name="l00142"></a>00142 |
| <a name="l00143"></a>00143 <span class="comment">/* Working pointer of inputB */</span> |
| <a name="l00144"></a>00144 py = pIn2; |
| <a name="l00145"></a>00145 |
| <a name="l00146"></a>00146 |
| <a name="l00147"></a>00147 <span class="comment">/* ------------------------ </span> |
| <a name="l00148"></a>00148 <span class="comment"> * Stage1 process </span> |
| <a name="l00149"></a>00149 <span class="comment"> * ----------------------*/</span> |
| <a name="l00150"></a>00150 |
| <a name="l00151"></a>00151 <span class="comment">/* The first stage starts here */</span> |
| <a name="l00152"></a>00152 <span class="keywordflow">while</span>(blockSize1 > 0u) |
| <a name="l00153"></a>00153 { |
| <a name="l00154"></a>00154 <span class="comment">/* Accumulator is made zero for every iteration */</span> |
| <a name="l00155"></a>00155 sum = 0; |
| <a name="l00156"></a>00156 |
| <a name="l00157"></a>00157 <span class="comment">/* Apply loop unrolling and compute 4 MACs simultaneously. */</span> |
| <a name="l00158"></a>00158 k = count >> 2u; |
| <a name="l00159"></a>00159 |
| <a name="l00160"></a>00160 <span class="comment">/* First part of the processing with loop unrolling. Compute 4 MACs at a time. </span> |
| <a name="l00161"></a>00161 <span class="comment"> ** a second loop below computes MACs for the remaining 1 to 3 samples. */</span> |
| <a name="l00162"></a>00162 <span class="keywordflow">while</span>(k > 0u) |
| <a name="l00163"></a>00163 { |
| <a name="l00164"></a>00164 <span class="comment">/* x[0] * y[srcBLen - 1] */</span> |
| <a name="l00165"></a>00165 sum = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) sum << 32) + |
| <a name="l00166"></a>00166 ((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * px++ * (*py--))) >> 32); |
| <a name="l00167"></a>00167 |
| <a name="l00168"></a>00168 <span class="comment">/* x[1] * y[srcBLen - 2] */</span> |
| <a name="l00169"></a>00169 sum = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) sum << 32) + |
| <a name="l00170"></a>00170 ((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * px++ * (*py--))) >> 32); |
| <a name="l00171"></a>00171 |
| <a name="l00172"></a>00172 <span class="comment">/* x[2] * y[srcBLen - 3] */</span> |
| <a name="l00173"></a>00173 sum = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) sum << 32) + |
| <a name="l00174"></a>00174 ((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * px++ * (*py--))) >> 32); |
| <a name="l00175"></a>00175 |
| <a name="l00176"></a>00176 <span class="comment">/* x[3] * y[srcBLen - 4] */</span> |
| <a name="l00177"></a>00177 sum = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) sum << 32) + |
| <a name="l00178"></a>00178 ((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * px++ * (*py--))) >> 32); |
| <a name="l00179"></a>00179 |
| <a name="l00180"></a>00180 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00181"></a>00181 k--; |
| <a name="l00182"></a>00182 } |
| <a name="l00183"></a>00183 |
| <a name="l00184"></a>00184 <span class="comment">/* If the count is not a multiple of 4, compute any remaining MACs here. </span> |
| <a name="l00185"></a>00185 <span class="comment"> ** No loop unrolling is used. */</span> |
| <a name="l00186"></a>00186 k = count % 0x4u; |
| <a name="l00187"></a>00187 |
| <a name="l00188"></a>00188 <span class="keywordflow">while</span>(k > 0u) |
| <a name="l00189"></a>00189 { |
| <a name="l00190"></a>00190 <span class="comment">/* Perform the multiply-accumulate */</span> |
| <a name="l00191"></a>00191 sum = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) sum << 32) + |
| <a name="l00192"></a>00192 ((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * px++ * (*py--))) >> 32); |
| <a name="l00193"></a>00193 |
| <a name="l00194"></a>00194 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00195"></a>00195 k--; |
| <a name="l00196"></a>00196 } |
| <a name="l00197"></a>00197 |
| <a name="l00198"></a>00198 <span class="comment">/* Store the result in the accumulator in the destination buffer. */</span> |
| <a name="l00199"></a>00199 *pOut++ = sum << 1; |
| <a name="l00200"></a>00200 |
| <a name="l00201"></a>00201 <span class="comment">/* Update the inputA and inputB pointers for next MAC calculation */</span> |
| <a name="l00202"></a>00202 py = pIn2 + count; |
| <a name="l00203"></a>00203 px = pIn1; |
| <a name="l00204"></a>00204 |
| <a name="l00205"></a>00205 <span class="comment">/* Increment the MAC count */</span> |
| <a name="l00206"></a>00206 count++; |
| <a name="l00207"></a>00207 |
| <a name="l00208"></a>00208 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00209"></a>00209 blockSize1--; |
| <a name="l00210"></a>00210 } |
| <a name="l00211"></a>00211 |
| <a name="l00212"></a>00212 <span class="comment">/* -------------------------- </span> |
| <a name="l00213"></a>00213 <span class="comment"> * Initializations of stage2 </span> |
| <a name="l00214"></a>00214 <span class="comment"> * ------------------------*/</span> |
| <a name="l00215"></a>00215 |
| <a name="l00216"></a>00216 <span class="comment">/* sum = x[0] * y[srcBLen-1] + x[1] * y[srcBLen-2] +...+ x[srcBLen-1] * y[0] </span> |
| <a name="l00217"></a>00217 <span class="comment"> * sum = x[1] * y[srcBLen-1] + x[2] * y[srcBLen-2] +...+ x[srcBLen] * y[0] </span> |
| <a name="l00218"></a>00218 <span class="comment"> * .... </span> |
| <a name="l00219"></a>00219 <span class="comment"> * sum = x[srcALen-srcBLen-2] * y[srcBLen-1] + x[srcALen] * y[srcBLen-2] +...+ x[srcALen-1] * y[0] </span> |
| <a name="l00220"></a>00220 <span class="comment"> */</span> |
| <a name="l00221"></a>00221 |
| <a name="l00222"></a>00222 <span class="comment">/* Working pointer of inputA */</span> |
| <a name="l00223"></a>00223 px = pIn1; |
| <a name="l00224"></a>00224 |
| <a name="l00225"></a>00225 <span class="comment">/* Working pointer of inputB */</span> |
| <a name="l00226"></a>00226 pSrc2 = pIn2 + (srcBLen - 1u); |
| <a name="l00227"></a>00227 py = pSrc2; |
| <a name="l00228"></a>00228 |
| <a name="l00229"></a>00229 <span class="comment">/* count is index by which the pointer pIn1 to be incremented */</span> |
| <a name="l00230"></a>00230 count = 1u; |
| <a name="l00231"></a>00231 |
| <a name="l00232"></a>00232 <span class="comment">/* ------------------- </span> |
| <a name="l00233"></a>00233 <span class="comment"> * Stage2 process </span> |
| <a name="l00234"></a>00234 <span class="comment"> * ------------------*/</span> |
| <a name="l00235"></a>00235 |
| <a name="l00236"></a>00236 <span class="comment">/* Stage2 depends on srcBLen as in this stage srcBLen number of MACS are performed. </span> |
| <a name="l00237"></a>00237 <span class="comment"> * So, to loop unroll over blockSize2, </span> |
| <a name="l00238"></a>00238 <span class="comment"> * srcBLen should be greater than or equal to 4 */</span> |
| <a name="l00239"></a>00239 <span class="keywordflow">if</span>(srcBLen >= 4u) |
| <a name="l00240"></a>00240 { |
| <a name="l00241"></a>00241 <span class="comment">/* Loop unroll over blockSize2, by 4 */</span> |
| <a name="l00242"></a>00242 blkCnt = blockSize2 >> 2u; |
| <a name="l00243"></a>00243 |
| <a name="l00244"></a>00244 <span class="keywordflow">while</span>(blkCnt > 0u) |
| <a name="l00245"></a>00245 { |
| <a name="l00246"></a>00246 <span class="comment">/* Set all accumulators to zero */</span> |
| <a name="l00247"></a>00247 acc0 = 0; |
| <a name="l00248"></a>00248 acc1 = 0; |
| <a name="l00249"></a>00249 acc2 = 0; |
| <a name="l00250"></a>00250 acc3 = 0; |
| <a name="l00251"></a>00251 |
| <a name="l00252"></a>00252 <span class="comment">/* read x[0], x[1], x[2] samples */</span> |
| <a name="l00253"></a>00253 x0 = *(px++); |
| <a name="l00254"></a>00254 x1 = *(px++); |
| <a name="l00255"></a>00255 x2 = *(px++); |
| <a name="l00256"></a>00256 |
| <a name="l00257"></a>00257 <span class="comment">/* Apply loop unrolling and compute 4 MACs simultaneously. */</span> |
| <a name="l00258"></a>00258 k = srcBLen >> 2u; |
| <a name="l00259"></a>00259 |
| <a name="l00260"></a>00260 <span class="comment">/* First part of the processing with loop unrolling. Compute 4 MACs at a time. </span> |
| <a name="l00261"></a>00261 <span class="comment"> ** a second loop below computes MACs for the remaining 1 to 3 samples. */</span> |
| <a name="l00262"></a>00262 <span class="keywordflow">do</span> |
| <a name="l00263"></a>00263 { |
| <a name="l00264"></a>00264 <span class="comment">/* Read y[srcBLen - 1] sample */</span> |
| <a name="l00265"></a>00265 c0 = *(py--); |
| <a name="l00266"></a>00266 |
| <a name="l00267"></a>00267 <span class="comment">/* Read x[3] sample */</span> |
| <a name="l00268"></a>00268 x3 = *(px++); |
| <a name="l00269"></a>00269 |
| <a name="l00270"></a>00270 <span class="comment">/* Perform the multiply-accumulates */</span> |
| <a name="l00271"></a>00271 <span class="comment">/* acc0 += x[0] * y[srcBLen - 1] */</span> |
| <a name="l00272"></a>00272 acc0 = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) acc0 << 32) + ((q63_t) x0 * c0)) >> 32); |
| <a name="l00273"></a>00273 |
| <a name="l00274"></a>00274 <span class="comment">/* acc1 += x[1] * y[srcBLen - 1] */</span> |
| <a name="l00275"></a>00275 acc1 = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) acc1 << 32) + ((q63_t) x1 * c0)) >> 32); |
| <a name="l00276"></a>00276 |
| <a name="l00277"></a>00277 <span class="comment">/* acc2 += x[2] * y[srcBLen - 1] */</span> |
| <a name="l00278"></a>00278 acc2 = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) acc2 << 32) + ((q63_t) x2 * c0)) >> 32); |
| <a name="l00279"></a>00279 |
| <a name="l00280"></a>00280 <span class="comment">/* acc3 += x[3] * y[srcBLen - 1] */</span> |
| <a name="l00281"></a>00281 acc3 = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) acc3 << 32) + ((q63_t) x3 * c0)) >> 32); |
| <a name="l00282"></a>00282 |
| <a name="l00283"></a>00283 <span class="comment">/* Read y[srcBLen - 2] sample */</span> |
| <a name="l00284"></a>00284 c0 = *(py--); |
| <a name="l00285"></a>00285 |
| <a name="l00286"></a>00286 <span class="comment">/* Read x[4] sample */</span> |
| <a name="l00287"></a>00287 x0 = *(px++); |
| <a name="l00288"></a>00288 |
| <a name="l00289"></a>00289 <span class="comment">/* Perform the multiply-accumulate */</span> |
| <a name="l00290"></a>00290 <span class="comment">/* acc0 += x[1] * y[srcBLen - 2] */</span> |
| <a name="l00291"></a>00291 acc0 = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) acc0 << 32) + ((q63_t) x1 * c0)) >> 32); |
| <a name="l00292"></a>00292 <span class="comment">/* acc1 += x[2] * y[srcBLen - 2] */</span> |
| <a name="l00293"></a>00293 acc1 = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) acc1 << 32) + ((q63_t) x2 * c0)) >> 32); |
| <a name="l00294"></a>00294 <span class="comment">/* acc2 += x[3] * y[srcBLen - 2] */</span> |
| <a name="l00295"></a>00295 acc2 = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) acc2 << 32) + ((q63_t) x3 * c0)) >> 32); |
| <a name="l00296"></a>00296 <span class="comment">/* acc3 += x[4] * y[srcBLen - 2] */</span> |
| <a name="l00297"></a>00297 acc3 = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) acc3 << 32) + ((q63_t) x0 * c0)) >> 32); |
| <a name="l00298"></a>00298 |
| <a name="l00299"></a>00299 <span class="comment">/* Read y[srcBLen - 3] sample */</span> |
| <a name="l00300"></a>00300 c0 = *(py--); |
| <a name="l00301"></a>00301 |
| <a name="l00302"></a>00302 <span class="comment">/* Read x[5] sample */</span> |
| <a name="l00303"></a>00303 x1 = *(px++); |
| <a name="l00304"></a>00304 |
| <a name="l00305"></a>00305 <span class="comment">/* Perform the multiply-accumulates */</span> |
| <a name="l00306"></a>00306 <span class="comment">/* acc0 += x[2] * y[srcBLen - 3] */</span> |
| <a name="l00307"></a>00307 acc0 = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) acc0 << 32) + ((q63_t) x2 * c0)) >> 32); |
| <a name="l00308"></a>00308 <span class="comment">/* acc1 += x[3] * y[srcBLen - 2] */</span> |
| <a name="l00309"></a>00309 acc1 = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) acc1 << 32) + ((q63_t) x3 * c0)) >> 32); |
| <a name="l00310"></a>00310 <span class="comment">/* acc2 += x[4] * y[srcBLen - 2] */</span> |
| <a name="l00311"></a>00311 acc2 = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) acc2 << 32) + ((q63_t) x0 * c0)) >> 32); |
| <a name="l00312"></a>00312 <span class="comment">/* acc3 += x[5] * y[srcBLen - 2] */</span> |
| <a name="l00313"></a>00313 acc3 = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) acc3 << 32) + ((q63_t) x1 * c0)) >> 32); |
| <a name="l00314"></a>00314 |
| <a name="l00315"></a>00315 <span class="comment">/* Read y[srcBLen - 4] sample */</span> |
| <a name="l00316"></a>00316 c0 = *(py--); |
| <a name="l00317"></a>00317 |
| <a name="l00318"></a>00318 <span class="comment">/* Read x[6] sample */</span> |
| <a name="l00319"></a>00319 x2 = *(px++); |
| <a name="l00320"></a>00320 |
| <a name="l00321"></a>00321 <span class="comment">/* Perform the multiply-accumulates */</span> |
| <a name="l00322"></a>00322 <span class="comment">/* acc0 += x[3] * y[srcBLen - 4] */</span> |
| <a name="l00323"></a>00323 acc0 = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) acc0 << 32) + ((q63_t) x3 * c0)) >> 32); |
| <a name="l00324"></a>00324 <span class="comment">/* acc1 += x[4] * y[srcBLen - 4] */</span> |
| <a name="l00325"></a>00325 acc1 = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) acc1 << 32) + ((q63_t) x0 * c0)) >> 32); |
| <a name="l00326"></a>00326 <span class="comment">/* acc2 += x[5] * y[srcBLen - 4] */</span> |
| <a name="l00327"></a>00327 acc2 = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) acc2 << 32) + ((q63_t) x1 * c0)) >> 32); |
| <a name="l00328"></a>00328 <span class="comment">/* acc3 += x[6] * y[srcBLen - 4] */</span> |
| <a name="l00329"></a>00329 acc3 = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) acc3 << 32) + ((q63_t) x2 * c0)) >> 32); |
| <a name="l00330"></a>00330 |
| <a name="l00331"></a>00331 |
| <a name="l00332"></a>00332 } <span class="keywordflow">while</span>(--k); |
| <a name="l00333"></a>00333 |
| <a name="l00334"></a>00334 <span class="comment">/* If the srcBLen is not a multiple of 4, compute any remaining MACs here. </span> |
| <a name="l00335"></a>00335 <span class="comment"> ** No loop unrolling is used. */</span> |
| <a name="l00336"></a>00336 k = srcBLen % 0x4u; |
| <a name="l00337"></a>00337 |
| <a name="l00338"></a>00338 <span class="keywordflow">while</span>(k > 0u) |
| <a name="l00339"></a>00339 { |
| <a name="l00340"></a>00340 <span class="comment">/* Read y[srcBLen - 5] sample */</span> |
| <a name="l00341"></a>00341 c0 = *(py--); |
| <a name="l00342"></a>00342 |
| <a name="l00343"></a>00343 <span class="comment">/* Read x[7] sample */</span> |
| <a name="l00344"></a>00344 x3 = *(px++); |
| <a name="l00345"></a>00345 |
| <a name="l00346"></a>00346 <span class="comment">/* Perform the multiply-accumulates */</span> |
| <a name="l00347"></a>00347 <span class="comment">/* acc0 += x[4] * y[srcBLen - 5] */</span> |
| <a name="l00348"></a>00348 acc0 = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) acc0 << 32) + ((q63_t) x0 * c0)) >> 32); |
| <a name="l00349"></a>00349 <span class="comment">/* acc1 += x[5] * y[srcBLen - 5] */</span> |
| <a name="l00350"></a>00350 acc1 = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) acc1 << 32) + ((q63_t) x1 * c0)) >> 32); |
| <a name="l00351"></a>00351 <span class="comment">/* acc2 += x[6] * y[srcBLen - 5] */</span> |
| <a name="l00352"></a>00352 acc2 = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) acc2 << 32) + ((q63_t) x2 * c0)) >> 32); |
| <a name="l00353"></a>00353 <span class="comment">/* acc3 += x[7] * y[srcBLen - 5] */</span> |
| <a name="l00354"></a>00354 acc3 = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) acc3 << 32) + ((q63_t) x3 * c0)) >> 32); |
| <a name="l00355"></a>00355 |
| <a name="l00356"></a>00356 <span class="comment">/* Reuse the present samples for the next MAC */</span> |
| <a name="l00357"></a>00357 x0 = x1; |
| <a name="l00358"></a>00358 x1 = x2; |
| <a name="l00359"></a>00359 x2 = x3; |
| <a name="l00360"></a>00360 |
| <a name="l00361"></a>00361 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00362"></a>00362 k--; |
| <a name="l00363"></a>00363 } |
| <a name="l00364"></a>00364 |
| <a name="l00365"></a>00365 <span class="comment">/* Store the results in the accumulators in the destination buffer. */</span> |
| <a name="l00366"></a>00366 *pOut++ = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) (acc0 << 1); |
| <a name="l00367"></a>00367 *pOut++ = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) (acc1 << 1); |
| <a name="l00368"></a>00368 *pOut++ = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) (acc2 << 1); |
| <a name="l00369"></a>00369 *pOut++ = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) (acc3 << 1); |
| <a name="l00370"></a>00370 |
| <a name="l00371"></a>00371 <span class="comment">/* Update the inputA and inputB pointers for next MAC calculation */</span> |
| <a name="l00372"></a>00372 px = pIn1 + (count * 4u); |
| <a name="l00373"></a>00373 py = pSrc2; |
| <a name="l00374"></a>00374 |
| <a name="l00375"></a>00375 <span class="comment">/* Increment the pointer pIn1 index, count by 1 */</span> |
| <a name="l00376"></a>00376 count++; |
| <a name="l00377"></a>00377 |
| <a name="l00378"></a>00378 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00379"></a>00379 blkCnt--; |
| <a name="l00380"></a>00380 } |
| <a name="l00381"></a>00381 |
| <a name="l00382"></a>00382 <span class="comment">/* If the blockSize2 is not a multiple of 4, compute any remaining output samples here. </span> |
| <a name="l00383"></a>00383 <span class="comment"> ** No loop unrolling is used. */</span> |
| <a name="l00384"></a>00384 blkCnt = blockSize2 % 0x4u; |
| <a name="l00385"></a>00385 |
| <a name="l00386"></a>00386 <span class="keywordflow">while</span>(blkCnt > 0u) |
| <a name="l00387"></a>00387 { |
| <a name="l00388"></a>00388 <span class="comment">/* Accumulator is made zero for every iteration */</span> |
| <a name="l00389"></a>00389 sum = 0; |
| <a name="l00390"></a>00390 |
| <a name="l00391"></a>00391 <span class="comment">/* Apply loop unrolling and compute 4 MACs simultaneously. */</span> |
| <a name="l00392"></a>00392 k = srcBLen >> 2u; |
| <a name="l00393"></a>00393 |
| <a name="l00394"></a>00394 <span class="comment">/* First part of the processing with loop unrolling. Compute 4 MACs at a time. </span> |
| <a name="l00395"></a>00395 <span class="comment"> ** a second loop below computes MACs for the remaining 1 to 3 samples. */</span> |
| <a name="l00396"></a>00396 <span class="keywordflow">while</span>(k > 0u) |
| <a name="l00397"></a>00397 { |
| <a name="l00398"></a>00398 <span class="comment">/* Perform the multiply-accumulates */</span> |
| <a name="l00399"></a>00399 sum = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) sum << 32) + |
| <a name="l00400"></a>00400 ((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * px++ * (*py--))) >> 32); |
| <a name="l00401"></a>00401 sum = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) sum << 32) + |
| <a name="l00402"></a>00402 ((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * px++ * (*py--))) >> 32); |
| <a name="l00403"></a>00403 sum = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) sum << 32) + |
| <a name="l00404"></a>00404 ((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * px++ * (*py--))) >> 32); |
| <a name="l00405"></a>00405 sum = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) sum << 32) + |
| <a name="l00406"></a>00406 ((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * px++ * (*py--))) >> 32); |
| <a name="l00407"></a>00407 |
| <a name="l00408"></a>00408 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00409"></a>00409 k--; |
| <a name="l00410"></a>00410 } |
| <a name="l00411"></a>00411 |
| <a name="l00412"></a>00412 <span class="comment">/* If the srcBLen is not a multiple of 4, compute any remaining MACs here. </span> |
| <a name="l00413"></a>00413 <span class="comment"> ** No loop unrolling is used. */</span> |
| <a name="l00414"></a>00414 k = srcBLen % 0x4u; |
| <a name="l00415"></a>00415 |
| <a name="l00416"></a>00416 <span class="keywordflow">while</span>(k > 0u) |
| <a name="l00417"></a>00417 { |
| <a name="l00418"></a>00418 <span class="comment">/* Perform the multiply-accumulate */</span> |
| <a name="l00419"></a>00419 sum = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) sum << 32) + |
| <a name="l00420"></a>00420 ((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * px++ * (*py--))) >> 32); |
| <a name="l00421"></a>00421 |
| <a name="l00422"></a>00422 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00423"></a>00423 k--; |
| <a name="l00424"></a>00424 } |
| <a name="l00425"></a>00425 |
| <a name="l00426"></a>00426 <span class="comment">/* Store the result in the accumulator in the destination buffer. */</span> |
| <a name="l00427"></a>00427 *pOut++ = sum << 1; |
| <a name="l00428"></a>00428 |
| <a name="l00429"></a>00429 <span class="comment">/* Update the inputA and inputB pointers for next MAC calculation */</span> |
| <a name="l00430"></a>00430 px = pIn1 + count; |
| <a name="l00431"></a>00431 py = pSrc2; |
| <a name="l00432"></a>00432 |
| <a name="l00433"></a>00433 <span class="comment">/* Increment the MAC count */</span> |
| <a name="l00434"></a>00434 count++; |
| <a name="l00435"></a>00435 |
| <a name="l00436"></a>00436 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00437"></a>00437 blkCnt--; |
| <a name="l00438"></a>00438 } |
| <a name="l00439"></a>00439 } |
| <a name="l00440"></a>00440 <span class="keywordflow">else</span> |
| <a name="l00441"></a>00441 { |
| <a name="l00442"></a>00442 <span class="comment">/* If the srcBLen is not a multiple of 4, </span> |
| <a name="l00443"></a>00443 <span class="comment"> * the blockSize2 loop cannot be unrolled by 4 */</span> |
| <a name="l00444"></a>00444 blkCnt = blockSize2; |
| <a name="l00445"></a>00445 |
| <a name="l00446"></a>00446 <span class="keywordflow">while</span>(blkCnt > 0u) |
| <a name="l00447"></a>00447 { |
| <a name="l00448"></a>00448 <span class="comment">/* Accumulator is made zero for every iteration */</span> |
| <a name="l00449"></a>00449 sum = 0; |
| <a name="l00450"></a>00450 |
| <a name="l00451"></a>00451 <span class="comment">/* srcBLen number of MACS should be performed */</span> |
| <a name="l00452"></a>00452 k = <a class="code" href="arm__convolution__example__f32_8c.html#aea71286f498978c5ed3775609b974fc8">srcBLen</a>; |
| <a name="l00453"></a>00453 |
| <a name="l00454"></a>00454 <span class="keywordflow">while</span>(k > 0u) |
| <a name="l00455"></a>00455 { |
| <a name="l00456"></a>00456 <span class="comment">/* Perform the multiply-accumulate */</span> |
| <a name="l00457"></a>00457 sum = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) sum << 32) + |
| <a name="l00458"></a>00458 ((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * px++ * (*py--))) >> 32); |
| <a name="l00459"></a>00459 |
| <a name="l00460"></a>00460 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00461"></a>00461 k--; |
| <a name="l00462"></a>00462 } |
| <a name="l00463"></a>00463 |
| <a name="l00464"></a>00464 <span class="comment">/* Store the result in the accumulator in the destination buffer. */</span> |
| <a name="l00465"></a>00465 *pOut++ = sum << 1; |
| <a name="l00466"></a>00466 |
| <a name="l00467"></a>00467 <span class="comment">/* Update the inputA and inputB pointers for next MAC calculation */</span> |
| <a name="l00468"></a>00468 px = pIn1 + count; |
| <a name="l00469"></a>00469 py = pSrc2; |
| <a name="l00470"></a>00470 |
| <a name="l00471"></a>00471 <span class="comment">/* Increment the MAC count */</span> |
| <a name="l00472"></a>00472 count++; |
| <a name="l00473"></a>00473 |
| <a name="l00474"></a>00474 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00475"></a>00475 blkCnt--; |
| <a name="l00476"></a>00476 } |
| <a name="l00477"></a>00477 } |
| <a name="l00478"></a>00478 |
| <a name="l00479"></a>00479 |
| <a name="l00480"></a>00480 <span class="comment">/* -------------------------- </span> |
| <a name="l00481"></a>00481 <span class="comment"> * Initializations of stage3 </span> |
| <a name="l00482"></a>00482 <span class="comment"> * -------------------------*/</span> |
| <a name="l00483"></a>00483 |
| <a name="l00484"></a>00484 <span class="comment">/* sum += x[srcALen-srcBLen+1] * y[srcBLen-1] + x[srcALen-srcBLen+2] * y[srcBLen-2] +...+ x[srcALen-1] * y[1] </span> |
| <a name="l00485"></a>00485 <span class="comment"> * sum += x[srcALen-srcBLen+2] * y[srcBLen-1] + x[srcALen-srcBLen+3] * y[srcBLen-2] +...+ x[srcALen-1] * y[2] </span> |
| <a name="l00486"></a>00486 <span class="comment"> * .... </span> |
| <a name="l00487"></a>00487 <span class="comment"> * sum += x[srcALen-2] * y[srcBLen-1] + x[srcALen-1] * y[srcBLen-2] </span> |
| <a name="l00488"></a>00488 <span class="comment"> * sum += x[srcALen-1] * y[srcBLen-1] </span> |
| <a name="l00489"></a>00489 <span class="comment"> */</span> |
| <a name="l00490"></a>00490 |
| <a name="l00491"></a>00491 <span class="comment">/* In this stage the MAC operations are decreased by 1 for every iteration. </span> |
| <a name="l00492"></a>00492 <span class="comment"> The blockSize3 variable holds the number of MAC operations performed */</span> |
| <a name="l00493"></a>00493 |
| <a name="l00494"></a>00494 <span class="comment">/* Working pointer of inputA */</span> |
| <a name="l00495"></a>00495 pSrc1 = (pIn1 + <a class="code" href="arm__convolution__example__f32_8c.html#ace48ed566e2cd6a680f0681192e6af28">srcALen</a>) - (srcBLen - 1u); |
| <a name="l00496"></a>00496 px = pSrc1; |
| <a name="l00497"></a>00497 |
| <a name="l00498"></a>00498 <span class="comment">/* Working pointer of inputB */</span> |
| <a name="l00499"></a>00499 pSrc2 = pIn2 + (srcBLen - 1u); |
| <a name="l00500"></a>00500 py = pSrc2; |
| <a name="l00501"></a>00501 |
| <a name="l00502"></a>00502 <span class="comment">/* ------------------- </span> |
| <a name="l00503"></a>00503 <span class="comment"> * Stage3 process </span> |
| <a name="l00504"></a>00504 <span class="comment"> * ------------------*/</span> |
| <a name="l00505"></a>00505 |
| <a name="l00506"></a>00506 <span class="keywordflow">while</span>(blockSize3 > 0u) |
| <a name="l00507"></a>00507 { |
| <a name="l00508"></a>00508 <span class="comment">/* Accumulator is made zero for every iteration */</span> |
| <a name="l00509"></a>00509 sum = 0; |
| <a name="l00510"></a>00510 |
| <a name="l00511"></a>00511 <span class="comment">/* Apply loop unrolling and compute 4 MACs simultaneously. */</span> |
| <a name="l00512"></a>00512 k = blockSize3 >> 2u; |
| <a name="l00513"></a>00513 |
| <a name="l00514"></a>00514 <span class="comment">/* First part of the processing with loop unrolling. Compute 4 MACs at a time. </span> |
| <a name="l00515"></a>00515 <span class="comment"> ** a second loop below computes MACs for the remaining 1 to 3 samples. */</span> |
| <a name="l00516"></a>00516 <span class="keywordflow">while</span>(k > 0u) |
| <a name="l00517"></a>00517 { |
| <a name="l00518"></a>00518 <span class="comment">/* sum += x[srcALen - srcBLen + 1] * y[srcBLen - 1] */</span> |
| <a name="l00519"></a>00519 sum = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) sum << 32) + |
| <a name="l00520"></a>00520 ((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * px++ * (*py--))) >> 32); |
| <a name="l00521"></a>00521 |
| <a name="l00522"></a>00522 <span class="comment">/* sum += x[srcALen - srcBLen + 2] * y[srcBLen - 2] */</span> |
| <a name="l00523"></a>00523 sum = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) sum << 32) + |
| <a name="l00524"></a>00524 ((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * px++ * (*py--))) >> 32); |
| <a name="l00525"></a>00525 |
| <a name="l00526"></a>00526 <span class="comment">/* sum += x[srcALen - srcBLen + 3] * y[srcBLen - 3] */</span> |
| <a name="l00527"></a>00527 sum = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) sum << 32) + |
| <a name="l00528"></a>00528 ((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * px++ * (*py--))) >> 32); |
| <a name="l00529"></a>00529 |
| <a name="l00530"></a>00530 <span class="comment">/* sum += x[srcALen - srcBLen + 4] * y[srcBLen - 4] */</span> |
| <a name="l00531"></a>00531 sum = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) sum << 32) + |
| <a name="l00532"></a>00532 ((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * px++ * (*py--))) >> 32); |
| <a name="l00533"></a>00533 |
| <a name="l00534"></a>00534 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00535"></a>00535 k--; |
| <a name="l00536"></a>00536 } |
| <a name="l00537"></a>00537 |
| <a name="l00538"></a>00538 <span class="comment">/* If the blockSize3 is not a multiple of 4, compute any remaining MACs here. </span> |
| <a name="l00539"></a>00539 <span class="comment"> ** No loop unrolling is used. */</span> |
| <a name="l00540"></a>00540 k = blockSize3 % 0x4u; |
| <a name="l00541"></a>00541 |
| <a name="l00542"></a>00542 <span class="keywordflow">while</span>(k > 0u) |
| <a name="l00543"></a>00543 { |
| <a name="l00544"></a>00544 <span class="comment">/* Perform the multiply-accumulate */</span> |
| <a name="l00545"></a>00545 sum = (<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) ((((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) sum << 32) + |
| <a name="l00546"></a>00546 ((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) * px++ * (*py--))) >> 32); |
| <a name="l00547"></a>00547 |
| <a name="l00548"></a>00548 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00549"></a>00549 k--; |
| <a name="l00550"></a>00550 } |
| <a name="l00551"></a>00551 |
| <a name="l00552"></a>00552 <span class="comment">/* Store the result in the accumulator in the destination buffer. */</span> |
| <a name="l00553"></a>00553 *pOut++ = sum << 1; |
| <a name="l00554"></a>00554 |
| <a name="l00555"></a>00555 <span class="comment">/* Update the inputA and inputB pointers for next MAC calculation */</span> |
| <a name="l00556"></a>00556 px = ++pSrc1; |
| <a name="l00557"></a>00557 py = pSrc2; |
| <a name="l00558"></a>00558 |
| <a name="l00559"></a>00559 <span class="comment">/* Decrement the loop counter */</span> |
| <a name="l00560"></a>00560 blockSize3--; |
| <a name="l00561"></a>00561 } |
| <a name="l00562"></a>00562 |
| <a name="l00563"></a>00563 } |
| <a name="l00564"></a>00564 |
| </pre></div></div> |
| </div> |
| <!--- window showing the filter options --> |
| <div id="MSearchSelectWindow" |
| onmouseover="return searchBox.OnSearchSelectShow()" |
| onmouseout="return searchBox.OnSearchSelectHide()" |
| onkeydown="return searchBox.OnSearchSelectKey(event)"> |
| <a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(0)"><span class="SelectionMark"> </span>All</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(1)"><span class="SelectionMark"> </span>Data Structures</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(2)"><span class="SelectionMark"> </span>Files</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(3)"><span class="SelectionMark"> </span>Functions</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(4)"><span class="SelectionMark"> </span>Variables</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(5)"><span class="SelectionMark"> </span>Typedefs</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(6)"><span class="SelectionMark"> </span>Enumerations</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(7)"><span class="SelectionMark"> </span>Enumerator</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(8)"><span class="SelectionMark"> </span>Defines</a></div> |
| |
| <!-- iframe showing the search results (closed by default) --> |
| <div id="MSearchResultsWindow"> |
| <iframe src="" frameborder="0" |
| name="MSearchResults" id="MSearchResults"> |
| </iframe> |
| </div> |
| |
| <hr class="footer"/><address class="footer"><small>Generated on Fri Jul 15 2011 13:16:16 for CMSIS DSP Software Library by  |
| <a href="http://www.doxygen.org/index.html"> |
| <img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.7.2 </small></address> |
| </body> |
| </html> |
