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<a href="#func-members">Functions</a> </div>
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<div class="headertitle"><div class="title">Vector Dot Product<div class="ingroups"><a class="el" href="group__groupMath.html">Basic Math Functions</a></div></div></div>
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</div><!--header-->
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<div class="contents">
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<table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="func-members" name="func-members"></a>
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Functions</h2></td></tr>
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<tr class="memitem:ga4b1c07e74162ebfeed1eb08020b15d70"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__BasicDotProd.html#ga4b1c07e74162ebfeed1eb08020b15d70">arm_dot_prod_f16</a> (const float16_t *pSrcA, const float16_t *pSrcB, uint32_t <a class="el" href="arm__variance__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>, float16_t *result)</td></tr>
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<tr class="memdesc:ga4b1c07e74162ebfeed1eb08020b15d70"><td class="mdescLeft"> </td><td class="mdescRight">Dot product of floating-point vectors. <a href="group__BasicDotProd.html#ga4b1c07e74162ebfeed1eb08020b15d70">More...</a><br /></td></tr>
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<tr class="separator:ga4b1c07e74162ebfeed1eb08020b15d70"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:gadf26f6bc62d6416528663ad3e46fbf67"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__BasicDotProd.html#gadf26f6bc62d6416528663ad3e46fbf67">arm_dot_prod_f32</a> (const <a class="el" href="arm__math__types_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *pSrcA, const <a class="el" href="arm__math__types_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *pSrcB, uint32_t <a class="el" href="arm__variance__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>, <a class="el" href="arm__math__types_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> *result)</td></tr>
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<tr class="memdesc:gadf26f6bc62d6416528663ad3e46fbf67"><td class="mdescLeft"> </td><td class="mdescRight">Dot product of floating-point vectors. <a href="group__BasicDotProd.html#gadf26f6bc62d6416528663ad3e46fbf67">More...</a><br /></td></tr>
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<tr class="separator:gadf26f6bc62d6416528663ad3e46fbf67"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:gaa923ad5a22eb55e10009a88c396a36ad"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__BasicDotProd.html#gaa923ad5a22eb55e10009a88c396a36ad">arm_dot_prod_f64</a> (const <a class="el" href="arm__math__types_8h.html#ac55f3ae81b5bc9053760baacf57e47f4">float64_t</a> *pSrcA, const <a class="el" href="arm__math__types_8h.html#ac55f3ae81b5bc9053760baacf57e47f4">float64_t</a> *pSrcB, uint32_t <a class="el" href="arm__variance__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>, <a class="el" href="arm__math__types_8h.html#ac55f3ae81b5bc9053760baacf57e47f4">float64_t</a> *result)</td></tr>
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<tr class="memdesc:gaa923ad5a22eb55e10009a88c396a36ad"><td class="mdescLeft"> </td><td class="mdescRight">Dot product of floating-point vectors. <a href="group__BasicDotProd.html#gaa923ad5a22eb55e10009a88c396a36ad">More...</a><br /></td></tr>
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<tr class="separator:gaa923ad5a22eb55e10009a88c396a36ad"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:gac2314012fbbf73bfd95ce8c57bc9ba69"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__BasicDotProd.html#gac2314012fbbf73bfd95ce8c57bc9ba69">arm_dot_prod_q15</a> (const <a class="el" href="arm__math__types_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> *pSrcA, const <a class="el" href="arm__math__types_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> *pSrcB, uint32_t <a class="el" href="arm__variance__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>, <a class="el" href="arm__math__types_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6">q63_t</a> *result)</td></tr>
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<tr class="memdesc:gac2314012fbbf73bfd95ce8c57bc9ba69"><td class="mdescLeft"> </td><td class="mdescRight">Dot product of Q15 vectors. <a href="group__BasicDotProd.html#gac2314012fbbf73bfd95ce8c57bc9ba69">More...</a><br /></td></tr>
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<tr class="separator:gac2314012fbbf73bfd95ce8c57bc9ba69"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:gafe3f9ace6c4576847eabf44ed7ca7b96"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__BasicDotProd.html#gafe3f9ace6c4576847eabf44ed7ca7b96">arm_dot_prod_q31</a> (const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *pSrcA, const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *pSrcB, uint32_t <a class="el" href="arm__variance__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>, <a class="el" href="arm__math__types_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6">q63_t</a> *result)</td></tr>
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<tr class="memdesc:gafe3f9ace6c4576847eabf44ed7ca7b96"><td class="mdescLeft"> </td><td class="mdescRight">Dot product of Q31 vectors. <a href="group__BasicDotProd.html#gafe3f9ace6c4576847eabf44ed7ca7b96">More...</a><br /></td></tr>
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<tr class="separator:gafe3f9ace6c4576847eabf44ed7ca7b96"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:gaadd347d5f5adf902c63f0b90ffc19538"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__BasicDotProd.html#gaadd347d5f5adf902c63f0b90ffc19538">arm_dot_prod_q7</a> (const <a class="el" href="arm__math__types_8h.html#ae541b6f232c305361e9b416fc9eed263">q7_t</a> *pSrcA, const <a class="el" href="arm__math__types_8h.html#ae541b6f232c305361e9b416fc9eed263">q7_t</a> *pSrcB, uint32_t <a class="el" href="arm__variance__example__f32_8c.html#ab6558f40a619c2502fbc24c880fd4fb0">blockSize</a>, <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> *result)</td></tr>
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<tr class="memdesc:gaadd347d5f5adf902c63f0b90ffc19538"><td class="mdescLeft"> </td><td class="mdescRight">Dot product of Q7 vectors. <a href="group__BasicDotProd.html#gaadd347d5f5adf902c63f0b90ffc19538">More...</a><br /></td></tr>
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<tr class="separator:gaadd347d5f5adf902c63f0b90ffc19538"><td class="memSeparator" colspan="2"> </td></tr>
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</table>
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<a name="details" id="details"></a><h2 class="groupheader">Description</h2>
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<p >Computes the dot product of two vectors. The vectors are multiplied element-by-element and then summed.</p>
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<pre>
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sum = pSrcA[0]*pSrcB[0] + pSrcA[1]*pSrcB[1] + ... + pSrcA[blockSize-1]*pSrcB[blockSize-1]
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</pre><p >There are separate functions for floating-point, Q7, Q15, and Q31 data types. </p>
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<h2 class="groupheader">Function Documentation</h2>
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<a id="ga4b1c07e74162ebfeed1eb08020b15d70" name="ga4b1c07e74162ebfeed1eb08020b15d70"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#ga4b1c07e74162ebfeed1eb08020b15d70">◆ </a></span>arm_dot_prod_f16()</h2>
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<div class="memitem">
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<div class="memproto">
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<table class="memname">
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<tr>
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<td class="memname">void arm_dot_prod_f16 </td>
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<td>(</td>
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<td class="paramtype">const float16_t * </td>
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<td class="paramname"><em>pSrcA</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const float16_t * </td>
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<td class="paramname"><em>pSrcB</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">uint32_t </td>
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<td class="paramname"><em>blockSize</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">float16_t * </td>
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<td class="paramname"><em>result</em> </td>
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</tr>
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<tr>
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<td></td>
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<td>)</td>
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<td></td><td></td>
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</tr>
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</table>
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</div><div class="memdoc">
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramdir">[in]</td><td class="paramname">pSrcA</td><td>points to the first input vector. </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">pSrcB</td><td>points to the second input vector. </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">blockSize</td><td>number of samples in each vector. </td></tr>
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<tr><td class="paramdir">[out]</td><td class="paramname">result</td><td>output result returned here. </td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>none </dd></dl>
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</div>
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</div>
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<a id="gadf26f6bc62d6416528663ad3e46fbf67" name="gadf26f6bc62d6416528663ad3e46fbf67"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#gadf26f6bc62d6416528663ad3e46fbf67">◆ </a></span>arm_dot_prod_f32()</h2>
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<div class="memitem">
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<div class="memproto">
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<table class="memname">
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<tr>
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<td class="memname">void arm_dot_prod_f32 </td>
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<td>(</td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> * </td>
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<td class="paramname"><em>pSrcA</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> * </td>
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<td class="paramname"><em>pSrcB</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">uint32_t </td>
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<td class="paramname"><em>blockSize</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype"><a class="el" href="arm__math__types_8h.html#a4611b605e45ab401f02cab15c5e38715">float32_t</a> * </td>
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<td class="paramname"><em>result</em> </td>
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</tr>
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<tr>
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<td></td>
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<td>)</td>
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<td></td><td></td>
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</tr>
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</table>
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</div><div class="memdoc">
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramdir">[in]</td><td class="paramname">pSrcA</td><td>points to the first input vector. </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">pSrcB</td><td>points to the second input vector. </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">blockSize</td><td>number of samples in each vector. </td></tr>
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<tr><td class="paramdir">[out]</td><td class="paramname">result</td><td>output result returned here. </td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>none </dd></dl>
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</div>
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</div>
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<a id="gaa923ad5a22eb55e10009a88c396a36ad" name="gaa923ad5a22eb55e10009a88c396a36ad"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#gaa923ad5a22eb55e10009a88c396a36ad">◆ </a></span>arm_dot_prod_f64()</h2>
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<div class="memitem">
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<div class="memproto">
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<table class="memname">
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<tr>
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<td class="memname">void arm_dot_prod_f64 </td>
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<td>(</td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#ac55f3ae81b5bc9053760baacf57e47f4">float64_t</a> * </td>
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<td class="paramname"><em>pSrcA</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#ac55f3ae81b5bc9053760baacf57e47f4">float64_t</a> * </td>
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<td class="paramname"><em>pSrcB</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">uint32_t </td>
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<td class="paramname"><em>blockSize</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype"><a class="el" href="arm__math__types_8h.html#ac55f3ae81b5bc9053760baacf57e47f4">float64_t</a> * </td>
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<td class="paramname"><em>result</em> </td>
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</tr>
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<tr>
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<td></td>
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<td>)</td>
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<td></td><td></td>
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</tr>
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</table>
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</div><div class="memdoc">
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramdir">[in]</td><td class="paramname">pSrcA</td><td>points to the first input vector. </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">pSrcB</td><td>points to the second input vector. </td></tr>
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<tr><td class="paramdir">[in]</td><td class="paramname">blockSize</td><td>number of samples in each vector. </td></tr>
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<tr><td class="paramdir">[out]</td><td class="paramname">result</td><td>output result returned here. </td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>none </dd></dl>
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</div>
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</div>
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<a id="gac2314012fbbf73bfd95ce8c57bc9ba69" name="gac2314012fbbf73bfd95ce8c57bc9ba69"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#gac2314012fbbf73bfd95ce8c57bc9ba69">◆ </a></span>arm_dot_prod_q15()</h2>
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<div class="memitem">
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<div class="memproto">
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<table class="memname">
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<tr>
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<td class="memname">void arm_dot_prod_q15 </td>
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<td>(</td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> * </td>
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<td class="paramname"><em>pSrcA</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#ab5a8fb21a5b3b983d5f54f31614052ea">q15_t</a> * </td>
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<td class="paramname"><em>pSrcB</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">uint32_t </td>
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<td class="paramname"><em>blockSize</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype"><a class="el" href="arm__math__types_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6">q63_t</a> * </td>
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<td class="paramname"><em>result</em> </td>
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</tr>
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<tr>
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<td></td>
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<td>)</td>
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<td></td><td></td>
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</tr>
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</table>
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</div><div class="memdoc">
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<dl class="params"><dt>Parameters</dt><dd>
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|
<table class="params">
|
|
<tr><td class="paramdir">[in]</td><td class="paramname">pSrcA</td><td>points to the first input vector </td></tr>
|
|
<tr><td class="paramdir">[in]</td><td class="paramname">pSrcB</td><td>points to the second input vector </td></tr>
|
|
<tr><td class="paramdir">[in]</td><td class="paramname">blockSize</td><td>number of samples in each vector </td></tr>
|
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<tr><td class="paramdir">[out]</td><td class="paramname">result</td><td>output result returned here </td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>none</dd></dl>
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<dl class="section user"><dt>Scaling and Overflow Behavior</dt><dd>The intermediate multiplications are in 1.15 x 1.15 = 2.30 format and these results are added to a 64-bit accumulator in 34.30 format. Nonsaturating additions are used and given that there are 33 guard bits in the accumulator there is no risk of overflow. The return result is in 34.30 format. </dd></dl>
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</div>
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</div>
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<a id="gafe3f9ace6c4576847eabf44ed7ca7b96" name="gafe3f9ace6c4576847eabf44ed7ca7b96"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#gafe3f9ace6c4576847eabf44ed7ca7b96">◆ </a></span>arm_dot_prod_q31()</h2>
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<div class="memitem">
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<div class="memproto">
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<table class="memname">
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<tr>
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<td class="memname">void arm_dot_prod_q31 </td>
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<td>(</td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> * </td>
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<td class="paramname"><em>pSrcA</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> * </td>
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<td class="paramname"><em>pSrcB</em>, </td>
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</tr>
|
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<tr>
|
|
<td class="paramkey"></td>
|
|
<td></td>
|
|
<td class="paramtype">uint32_t </td>
|
|
<td class="paramname"><em>blockSize</em>, </td>
|
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</tr>
|
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<tr>
|
|
<td class="paramkey"></td>
|
|
<td></td>
|
|
<td class="paramtype"><a class="el" href="arm__math__types_8h.html#a5aea1cb12fc02d9d44c8abf217eaa5c6">q63_t</a> * </td>
|
|
<td class="paramname"><em>result</em> </td>
|
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</tr>
|
|
<tr>
|
|
<td></td>
|
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<td>)</td>
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<td></td><td></td>
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</tr>
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</table>
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</div><div class="memdoc">
|
|
<dl class="params"><dt>Parameters</dt><dd>
|
|
<table class="params">
|
|
<tr><td class="paramdir">[in]</td><td class="paramname">pSrcA</td><td>points to the first input vector. </td></tr>
|
|
<tr><td class="paramdir">[in]</td><td class="paramname">pSrcB</td><td>points to the second input vector. </td></tr>
|
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<tr><td class="paramdir">[in]</td><td class="paramname">blockSize</td><td>number of samples in each vector. </td></tr>
|
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<tr><td class="paramdir">[out]</td><td class="paramname">result</td><td>output result returned here. </td></tr>
|
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</table>
|
|
</dd>
|
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</dl>
|
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<dl class="section return"><dt>Returns</dt><dd>none</dd></dl>
|
|
<dl class="section user"><dt>Scaling and Overflow Behavior</dt><dd>The intermediate multiplications are in 1.31 x 1.31 = 2.62 format and these are truncated to 2.48 format by discarding the lower 14 bits. The 2.48 result is then added without saturation to a 64-bit accumulator in 16.48 format. There are 15 guard bits in the accumulator and there is no risk of overflow as long as the length of the vectors is less than 2^16 elements. The return result is in 16.48 format. </dd></dl>
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</div>
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</div>
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<a id="gaadd347d5f5adf902c63f0b90ffc19538" name="gaadd347d5f5adf902c63f0b90ffc19538"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#gaadd347d5f5adf902c63f0b90ffc19538">◆ </a></span>arm_dot_prod_q7()</h2>
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<div class="memitem">
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<div class="memproto">
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<table class="memname">
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<tr>
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<td class="memname">void arm_dot_prod_q7 </td>
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<td>(</td>
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<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#ae541b6f232c305361e9b416fc9eed263">q7_t</a> * </td>
|
|
<td class="paramname"><em>pSrcA</em>, </td>
|
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</tr>
|
|
<tr>
|
|
<td class="paramkey"></td>
|
|
<td></td>
|
|
<td class="paramtype">const <a class="el" href="arm__math__types_8h.html#ae541b6f232c305361e9b416fc9eed263">q7_t</a> * </td>
|
|
<td class="paramname"><em>pSrcB</em>, </td>
|
|
</tr>
|
|
<tr>
|
|
<td class="paramkey"></td>
|
|
<td></td>
|
|
<td class="paramtype">uint32_t </td>
|
|
<td class="paramname"><em>blockSize</em>, </td>
|
|
</tr>
|
|
<tr>
|
|
<td class="paramkey"></td>
|
|
<td></td>
|
|
<td class="paramtype"><a class="el" href="arm__math__types_8h.html#adc89a3547f5324b7b3b95adec3806bc0">q31_t</a> * </td>
|
|
<td class="paramname"><em>result</em> </td>
|
|
</tr>
|
|
<tr>
|
|
<td></td>
|
|
<td>)</td>
|
|
<td></td><td></td>
|
|
</tr>
|
|
</table>
|
|
</div><div class="memdoc">
|
|
<dl class="params"><dt>Parameters</dt><dd>
|
|
<table class="params">
|
|
<tr><td class="paramdir">[in]</td><td class="paramname">pSrcA</td><td>points to the first input vector </td></tr>
|
|
<tr><td class="paramdir">[in]</td><td class="paramname">pSrcB</td><td>points to the second input vector </td></tr>
|
|
<tr><td class="paramdir">[in]</td><td class="paramname">blockSize</td><td>number of samples in each vector </td></tr>
|
|
<tr><td class="paramdir">[out]</td><td class="paramname">result</td><td>output result returned here </td></tr>
|
|
</table>
|
|
</dd>
|
|
</dl>
|
|
<dl class="section return"><dt>Returns</dt><dd>none</dd></dl>
|
|
<dl class="section user"><dt>Scaling and Overflow Behavior</dt><dd>The intermediate multiplications are in 1.7 x 1.7 = 2.14 format and these results are added to an accumulator in 18.14 format. Nonsaturating additions are used and there is no danger of wrap around as long as the vectors are less than 2^18 elements long. The return result is in 18.14 format. </dd></dl>
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</div>
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</div>
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