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<h1>arm_mult_q7.c</h1>  </div>
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<a href="arm__mult__q7_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_mult_q7.c   </span>
<a name="l00009"></a>00009 <span class="comment">*   </span>
<a name="l00010"></a>00010 <span class="comment">* Description:  Q7 vector multiplication.   </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 <span class="comment">* Version 0.0.7  2010/06/10    </span>
<a name="l00030"></a>00030 <span class="comment">*    Misra-C changes done   </span>
<a name="l00031"></a>00031 <span class="comment">*   </span>
<a name="l00032"></a>00032 <span class="comment">* Version 0.0.5  2010/04/26    </span>
<a name="l00033"></a>00033 <span class="comment">*    incorporated review comments and updated with latest CMSIS layer   </span>
<a name="l00034"></a>00034 <span class="comment">*   </span>
<a name="l00035"></a>00035 <span class="comment">* Version 0.0.3  2010/03/10 DP   </span>
<a name="l00036"></a>00036 <span class="comment">*    Initial version   </span>
<a name="l00037"></a>00037 <span class="comment">* -------------------------------------------------------------------- */</span>
<a name="l00038"></a>00038 
<a name="l00039"></a>00039 <span class="preprocessor">#include &quot;<a class="code" href="arm__math_8h.html">arm_math.h</a>&quot;</span>
<a name="l00040"></a>00040 
<a name="l00064"></a><a class="code" href="group___basic_mult.html#ga16677275ed83ff0878da531e875c27ef">00064</a> <span class="keywordtype">void</span> <a class="code" href="group___basic_mult.html#ga16677275ed83ff0878da531e875c27ef" title="Q7 vector multiplication.">arm_mult_q7</a>(
<a name="l00065"></a>00065   <a class="code" href="arm__math_8h.html#ae541b6f232c305361e9b416fc9eed263" title="8-bit fractional data type in 1.7 format.">q7_t</a> * pSrcA,
<a name="l00066"></a>00066   <a class="code" href="arm__math_8h.html#ae541b6f232c305361e9b416fc9eed263" title="8-bit fractional data type in 1.7 format.">q7_t</a> * pSrcB,
<a name="l00067"></a>00067   <a class="code" href="arm__math_8h.html#ae541b6f232c305361e9b416fc9eed263" title="8-bit fractional data type in 1.7 format.">q7_t</a> * pDst,
<a name="l00068"></a>00068   uint32_t <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>)
<a name="l00069"></a>00069 {
<a name="l00070"></a>00070   uint32_t blkCnt;                               <span class="comment">/* loop counters */</span>
<a name="l00071"></a>00071 
<a name="l00072"></a>00072 <span class="preprocessor">#ifndef ARM_MATH_CM0</span>
<a name="l00073"></a>00073 <span class="preprocessor"></span>
<a name="l00074"></a>00074 <span class="comment">/* Run the below code for Cortex-M4 and Cortex-M3 */</span>
<a name="l00075"></a>00075   <a class="code" href="arm__math_8h.html#ae541b6f232c305361e9b416fc9eed263" title="8-bit fractional data type in 1.7 format.">q7_t</a> out1, out2, out3, out4;                   <span class="comment">/* Temporary variables to store the product */</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 * B */</span>
<a name="l00085"></a>00085     <span class="comment">/* Multiply the inputs and store the results in temporary variables */</span>
<a name="l00086"></a>00086     out1 = (<a class="code" href="arm__math_8h.html#ae541b6f232c305361e9b416fc9eed263" title="8-bit fractional data type in 1.7 format.">q7_t</a>) (((<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) (*pSrcA++) * (*pSrcB++)) &gt;&gt; 7);
<a name="l00087"></a>00087     out2 = (<a class="code" href="arm__math_8h.html#ae541b6f232c305361e9b416fc9eed263" title="8-bit fractional data type in 1.7 format.">q7_t</a>) (((<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) (*pSrcA++) * (*pSrcB++)) &gt;&gt; 7);
<a name="l00088"></a>00088     out3 = (<a class="code" href="arm__math_8h.html#ae541b6f232c305361e9b416fc9eed263" title="8-bit fractional data type in 1.7 format.">q7_t</a>) (((<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) (*pSrcA++) * (*pSrcB++)) &gt;&gt; 7);
<a name="l00089"></a>00089     out4 = (<a class="code" href="arm__math_8h.html#ae541b6f232c305361e9b416fc9eed263" title="8-bit fractional data type in 1.7 format.">q7_t</a>) (((<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) (*pSrcA++) * (*pSrcB++)) &gt;&gt; 7);
<a name="l00090"></a>00090 
<a name="l00091"></a>00091     <span class="comment">/* Store the results of 4 inputs in the destination buffer in single cycle by packing */</span>
<a name="l00092"></a>00092     *<a class="code" href="arm__math_8h.html#a9de2e0a5785be82866bcb96012282248" title="definition to read/write two 16 bit values.">__SIMD32</a>(pDst)++ = <a class="code" href="arm__math_8h.html#a3ebff224ad44c217fde9f530342e2960" title="definition to pack four 8 bit values.">__PACKq7</a>(out1, out2, out3, out4);
<a name="l00093"></a>00093 
<a name="l00094"></a>00094     <span class="comment">/* Decrement the blockSize loop counter */</span>
<a name="l00095"></a>00095     blkCnt--;
<a name="l00096"></a>00096   }
<a name="l00097"></a>00097 
<a name="l00098"></a>00098   <span class="comment">/* If the blockSize is not a multiple of 4, compute any remaining output samples here.   </span>
<a name="l00099"></a>00099 <span class="comment">   ** No loop unrolling is used. */</span>
<a name="l00100"></a>00100   blkCnt = blockSize % 0x4u;
<a name="l00101"></a>00101 
<a name="l00102"></a>00102 <span class="preprocessor">#else</span>
<a name="l00103"></a>00103 <span class="preprocessor"></span>
<a name="l00104"></a>00104   <span class="comment">/* Run the below code for Cortex-M0 */</span>
<a name="l00105"></a>00105 
<a name="l00106"></a>00106   <span class="comment">/* Initialize blkCnt with number of samples */</span>
<a name="l00107"></a>00107   blkCnt = <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>;
<a name="l00108"></a>00108 
<a name="l00109"></a>00109 <span class="preprocessor">#endif </span><span class="comment">/* #ifndef ARM_MATH_CM0 */</span>
<a name="l00110"></a>00110 
<a name="l00111"></a>00111 
<a name="l00112"></a>00112   <span class="keywordflow">while</span>(blkCnt &gt; 0u)
<a name="l00113"></a>00113   {
<a name="l00114"></a>00114     <span class="comment">/* C = A * B */</span>
<a name="l00115"></a>00115     <span class="comment">/* Multiply the inputs and store the result in the destination buffer */</span>
<a name="l00116"></a>00116     *pDst++ = (<a class="code" href="arm__math_8h.html#ae541b6f232c305361e9b416fc9eed263" title="8-bit fractional data type in 1.7 format.">q7_t</a>) (((<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) (*pSrcA++) * (*pSrcB++)) &gt;&gt; 7);
<a name="l00117"></a>00117 
<a name="l00118"></a>00118     <span class="comment">/* Decrement the blockSize loop counter */</span>
<a name="l00119"></a>00119     blkCnt--;
<a name="l00120"></a>00120   }
<a name="l00121"></a>00121 }
<a name="l00122"></a>00122 
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