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<h1>arm_power_q31.c</h1> </div>
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<a href="arm__power__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_power_q31.c </span>
<a name="l00009"></a>00009 <span class="comment">* </span>
<a name="l00010"></a>00010 <span class="comment">* Description: Sum of the squares of the elements of a Q31 vector. </span>
<a name="l00011"></a>00011 <span class="comment">* </span>
<a name="l00012"></a>00012 <span class="comment">* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0</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 &quot;<a class="code" href="arm__math_8h.html">arm_math.h</a>&quot;</span>
<a name="l00031"></a>00031
<a name="l00063"></a><a class="code" href="group__power.html#ga0b93d31bb5b5ed214c2b94d8a7744cd2">00063</a> <span class="keywordtype">void</span> <a class="code" href="group__power.html#ga0b93d31bb5b5ed214c2b94d8a7744cd2" title="Sum of the squares of the elements of a Q31 vector.">arm_power_q31</a>(
<a name="l00064"></a>00064 <a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a> * pSrc,
<a name="l00065"></a>00065 uint32_t <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>,
<a name="l00066"></a>00066 <a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a> * pResult)
<a name="l00067"></a>00067 {
<a name="l00068"></a>00068 <a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a> sum = 0; <span class="comment">/* Temporary result storage */</span>
<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> in;
<a name="l00070"></a>00070 uint32_t blkCnt; <span class="comment">/* loop counter */</span>
<a name="l00071"></a>00071
<a name="l00072"></a>00072
<a name="l00073"></a>00073 <span class="preprocessor">#ifndef ARM_MATH_CM0</span>
<a name="l00074"></a>00074 <span class="preprocessor"></span>
<a name="l00075"></a>00075 <span class="comment">/* Run the below code for Cortex-M4 and Cortex-M3 */</span>
<a name="l00076"></a>00076
<a name="l00077"></a>00077 <span class="comment">/*loop Unrolling */</span>
<a name="l00078"></a>00078 blkCnt = blockSize &gt;&gt; 2u;
<a name="l00079"></a>00079
<a name="l00080"></a>00080 <span class="comment">/* First part of the processing with loop unrolling. Compute 4 outputs at a time. </span>
<a name="l00081"></a>00081 <span class="comment"> ** a second loop below computes the remaining 1 to 3 samples. */</span>
<a name="l00082"></a>00082 <span class="keywordflow">while</span>(blkCnt &gt; 0u)
<a name="l00083"></a>00083 {
<a name="l00084"></a>00084 <span class="comment">/* C = A[0] * A[0] + A[1] * A[1] + A[2] * A[2] + ... + A[blockSize-1] * A[blockSize-1] */</span>
<a name="l00085"></a>00085 <span class="comment">/* Compute Power then shift intermediate results by 14 bits to maintain 16.48 format and then store the result in a temporary variable sum, providing 15 guard bits. */</span>
<a name="l00086"></a>00086 in = *pSrc++;
<a name="l00087"></a>00087 sum += ((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) in * in) &gt;&gt; 14u;
<a name="l00088"></a>00088
<a name="l00089"></a>00089 in = *pSrc++;
<a name="l00090"></a>00090 sum += ((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) in * in) &gt;&gt; 14u;
<a name="l00091"></a>00091
<a name="l00092"></a>00092 in = *pSrc++;
<a name="l00093"></a>00093 sum += ((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) in * in) &gt;&gt; 14u;
<a name="l00094"></a>00094
<a name="l00095"></a>00095 in = *pSrc++;
<a name="l00096"></a>00096 sum += ((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) in * in) &gt;&gt; 14u;
<a name="l00097"></a>00097
<a name="l00098"></a>00098 <span class="comment">/* Decrement the loop counter */</span>
<a name="l00099"></a>00099 blkCnt--;
<a name="l00100"></a>00100 }
<a name="l00101"></a>00101
<a name="l00102"></a>00102 <span class="comment">/* If the blockSize is not a multiple of 4, compute any remaining output samples here. </span>
<a name="l00103"></a>00103 <span class="comment"> ** No loop unrolling is used. */</span>
<a name="l00104"></a>00104 blkCnt = blockSize % 0x4u;
<a name="l00105"></a>00105
<a name="l00106"></a>00106 <span class="preprocessor">#else</span>
<a name="l00107"></a>00107 <span class="preprocessor"></span>
<a name="l00108"></a>00108 <span class="comment">/* Run the below code for Cortex-M0 */</span>
<a name="l00109"></a>00109
<a name="l00110"></a>00110 <span class="comment">/* Loop over blockSize number of values */</span>
<a name="l00111"></a>00111 blkCnt = <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>;
<a name="l00112"></a>00112
<a name="l00113"></a>00113 <span class="preprocessor">#endif </span><span class="comment">/* #ifndef ARM_MATH_CM0 */</span>
<a name="l00114"></a>00114
<a name="l00115"></a>00115 <span class="keywordflow">while</span>(blkCnt &gt; 0u)
<a name="l00116"></a>00116 {
<a name="l00117"></a>00117 <span class="comment">/* C = A[0] * A[0] + A[1] * A[1] + A[2] * A[2] + ... + A[blockSize-1] * A[blockSize-1] */</span>
<a name="l00118"></a>00118 <span class="comment">/* Compute Power and then store the result in a temporary variable, sum. */</span>
<a name="l00119"></a>00119 in = *pSrc++;
<a name="l00120"></a>00120 sum += ((<a class="code" href="arm__math_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6" title="64-bit fractional data type in 1.63 format.">q63_t</a>) in * in) &gt;&gt; 14u;
<a name="l00121"></a>00121
<a name="l00122"></a>00122 <span class="comment">/* Decrement the loop counter */</span>
<a name="l00123"></a>00123 blkCnt--;
<a name="l00124"></a>00124 }
<a name="l00125"></a>00125
<a name="l00126"></a>00126 <span class="comment">/* Store the results in 16.48 format */</span>
<a name="l00127"></a>00127 *pResult = sum;
<a name="l00128"></a>00128 }
<a name="l00129"></a>00129
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