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| <h1>arm_mult_q15.c</h1> </div> |
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| <a href="arm__mult__q15_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_q15.c </span> |
| <a name="l00009"></a>00009 <span class="comment">* </span> |
| <a name="l00010"></a>00010 <span class="comment">* Description: Q15 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 0.0.5 2010/04/26 </span> |
| <a name="l00030"></a>00030 <span class="comment">* incorporated review comments and updated with latest CMSIS layer </span> |
| <a name="l00031"></a>00031 <span class="comment">* </span> |
| <a name="l00032"></a>00032 <span class="comment">* Version 0.0.3 2010/03/10 </span> |
| <a name="l00033"></a>00033 <span class="comment">* Initial version </span> |
| <a name="l00034"></a>00034 <span class="comment">* -------------------------------------------------------------------- */</span> |
| <a name="l00035"></a>00035 |
| <a name="l00036"></a>00036 <span class="preprocessor">#include "<a class="code" href="arm__math_8h.html">arm_math.h</a>"</span> |
| <a name="l00037"></a>00037 |
| <a name="l00062"></a><a class="code" href="group___basic_mult.html#gafb0778d27ed98a2a6f2ecb7d48cc8c75">00062</a> <span class="keywordtype">void</span> <a class="code" href="group___basic_mult.html#gafb0778d27ed98a2a6f2ecb7d48cc8c75" title="Q15 vector multiplication.">arm_mult_q15</a>( |
| <a name="l00063"></a>00063 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> * pSrcA, |
| <a name="l00064"></a>00064 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> * pSrcB, |
| <a name="l00065"></a>00065 <a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a> * pDst, |
| <a name="l00066"></a>00066 uint32_t <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>) |
| <a name="l00067"></a>00067 { |
| <a name="l00068"></a>00068 uint32_t blkCnt; <span class="comment">/* loop counters */</span> |
| <a name="l00069"></a>00069 |
| <a name="l00070"></a>00070 <span class="preprocessor">#ifndef ARM_MATH_CM0</span> |
| <a name="l00071"></a>00071 <span class="preprocessor"></span> |
| <a name="l00072"></a>00072 <span class="comment">/* Run the below code for Cortex-M4 and Cortex-M3 */</span> |
| <a name="l00073"></a>00073 |
| <a name="l00074"></a>00074 <span class="comment">/* loop Unrolling */</span> |
| <a name="l00075"></a>00075 blkCnt = blockSize >> 2u; |
| <a name="l00076"></a>00076 |
| <a name="l00077"></a>00077 <span class="comment">/* First part of the processing with loop unrolling. Compute 4 outputs at a time. </span> |
| <a name="l00078"></a>00078 <span class="comment"> ** a second loop below computes the remaining 1 to 3 samples. */</span> |
| <a name="l00079"></a>00079 <span class="keywordflow">while</span>(blkCnt > 0u) |
| <a name="l00080"></a>00080 { |
| <a name="l00081"></a>00081 <span class="comment">/* C = A * B */</span> |
| <a name="l00082"></a>00082 <span class="comment">/* Multiply the inputs and store the result in the destination buffer */</span> |
| <a name="l00083"></a>00083 *pDst++ = (<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) __SSAT((((<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) (*pSrcA++) * (*pSrcB++)) >> 15), 16); |
| <a name="l00084"></a>00084 *pDst++ = (<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) __SSAT((((<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) (*pSrcA++) * (*pSrcB++)) >> 15), 16); |
| <a name="l00085"></a>00085 *pDst++ = (<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) __SSAT((((<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) (*pSrcA++) * (*pSrcB++)) >> 15), 16); |
| <a name="l00086"></a>00086 *pDst++ = (<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) __SSAT((((<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) (*pSrcA++) * (*pSrcB++)) >> 15), 16); |
| <a name="l00087"></a>00087 |
| <a name="l00088"></a>00088 <span class="comment">/* Decrement the blockSize loop counter */</span> |
| <a name="l00089"></a>00089 blkCnt--; |
| <a name="l00090"></a>00090 } |
| <a name="l00091"></a>00091 |
| <a name="l00092"></a>00092 <span class="comment">/* If the blockSize is not a multiple of 4, compute any remaining output samples here. </span> |
| <a name="l00093"></a>00093 <span class="comment"> ** No loop unrolling is used. */</span> |
| <a name="l00094"></a>00094 blkCnt = blockSize % 0x4u; |
| <a name="l00095"></a>00095 |
| <a name="l00096"></a>00096 <span class="preprocessor">#else</span> |
| <a name="l00097"></a>00097 <span class="preprocessor"></span> |
| <a name="l00098"></a>00098 <span class="comment">/* Run the below code for Cortex-M0 */</span> |
| <a name="l00099"></a>00099 |
| <a name="l00100"></a>00100 <span class="comment">/* Initialize blkCnt with number of samples */</span> |
| <a name="l00101"></a>00101 blkCnt = <a class="code" href="arm__fir__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>; |
| <a name="l00102"></a>00102 |
| <a name="l00103"></a>00103 <span class="preprocessor">#endif </span><span class="comment">/* #ifndef ARM_MATH_CM0 */</span> |
| <a name="l00104"></a>00104 |
| <a name="l00105"></a>00105 |
| <a name="l00106"></a>00106 <span class="keywordflow">while</span>(blkCnt > 0u) |
| <a name="l00107"></a>00107 { |
| <a name="l00108"></a>00108 <span class="comment">/* C = A * B */</span> |
| <a name="l00109"></a>00109 <span class="comment">/* Multiply the inputs and store the result in the destination buffer */</span> |
| <a name="l00110"></a>00110 *pDst++ = (<a class="code" href="arm__math_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea" title="16-bit fractional data type in 1.15 format.">q15_t</a>) __SSAT((((<a class="code" href="arm__math_8h.html#adc89a3547f5324b7b3b95adec3806bc0" title="32-bit fractional data type in 1.31 format.">q31_t</a>) (*pSrcA++) * (*pSrcB++)) >> 15), 16); |
| <a name="l00111"></a>00111 |
| <a name="l00112"></a>00112 <span class="comment">/* Decrement the blockSize loop counter */</span> |
| <a name="l00113"></a>00113 blkCnt--; |
| <a name="l00114"></a>00114 } |
| <a name="l00115"></a>00115 } |
| <a name="l00116"></a>00116 |
| </pre></div></div> |
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