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<a href="#pub-methods">Public Member Functions</a> |
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<div class="title">QuantizedMultiplierSmallerThanOne Struct Reference</div> </div>
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<p>Performs multiplication of an integer with a multiplier which is less than one, using quantized integer arithmetic which is consistent with AndroidNN's CPU executor.
<a href="structarmnn_1_1_quantized_multiplier_smaller_than_one.html#details">More...</a></p>
<p><code>#include <<a class="el" href="_conv_impl_8hpp_source.html">ConvImpl.hpp</a>></code></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr class="memitem:a1ec4f749fbbdacbe2cc7e8895d5b65ed"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="structarmnn_1_1_quantized_multiplier_smaller_than_one.html#a1ec4f749fbbdacbe2cc7e8895d5b65ed">QuantizedMultiplierSmallerThanOne</a> (float multiplier)</td></tr>
<tr class="memdesc:a1ec4f749fbbdacbe2cc7e8895d5b65ed"><td class="mdescLeft"> </td><td class="mdescRight">Constructs a <a class="el" href="structarmnn_1_1_quantized_multiplier_smaller_than_one.html" title="Performs multiplication of an integer with a multiplier which is less than one, using quantized integ...">QuantizedMultiplierSmallerThanOne</a> which will multiply by the given multiplier. <a href="structarmnn_1_1_quantized_multiplier_smaller_than_one.html#a1ec4f749fbbdacbe2cc7e8895d5b65ed">More...</a><br /></td></tr>
<tr class="separator:a1ec4f749fbbdacbe2cc7e8895d5b65ed"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ac04834893e568dfea4642ecb575faed8"><td class="memItemLeft" align="right" valign="top">int32_t </td><td class="memItemRight" valign="bottom"><a class="el" href="structarmnn_1_1_quantized_multiplier_smaller_than_one.html#ac04834893e568dfea4642ecb575faed8">operator*</a> (int32_t rhs) const</td></tr>
<tr class="memdesc:ac04834893e568dfea4642ecb575faed8"><td class="mdescLeft"> </td><td class="mdescRight">The implementation of this function is adapted from Android NN's MultiplyByQuantizedMultiplierSmallerThanOne(). <a href="structarmnn_1_1_quantized_multiplier_smaller_than_one.html#ac04834893e568dfea4642ecb575faed8">More...</a><br /></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Performs multiplication of an integer with a multiplier which is less than one, using quantized integer arithmetic which is consistent with AndroidNN's CPU executor. </p>
<p class="definition">Definition at line <a class="el" href="_conv_impl_8hpp_source.html#l00026">26</a> of file <a class="el" href="_conv_impl_8hpp_source.html">ConvImpl.hpp</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a1ec4f749fbbdacbe2cc7e8895d5b65ed">◆ </a></span>QuantizedMultiplierSmallerThanOne()</h2>
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<td class="memname"><a class="el" href="structarmnn_1_1_quantized_multiplier_smaller_than_one.html">QuantizedMultiplierSmallerThanOne</a> </td>
<td>(</td>
<td class="paramtype">float </td>
<td class="paramname"><em>multiplier</em></td><td>)</td>
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<p>Constructs a <a class="el" href="structarmnn_1_1_quantized_multiplier_smaller_than_one.html" title="Performs multiplication of an integer with a multiplier which is less than one, using quantized integ...">QuantizedMultiplierSmallerThanOne</a> which will multiply by the given multiplier. </p>
<p>This stores the appropriate integer quantities (derived from the given multiplier) for later use. The implementation of this function is adapted from Android NN's QuantizeMultiplierSmallerThanOne(). </p>
<p class="definition">Definition at line <a class="el" href="_conv_impl_8cpp_source.html#l00016">16</a> of file <a class="el" href="_conv_impl_8cpp_source.html">ConvImpl.cpp</a>.</p>
<div class="fragment"><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> {</div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>  <a class="code" href="_assert_8hpp.html#a5698be69cbd5dfe6c28fcd9867e8cbed">ARMNN_ASSERT</a>(multiplier >= 0.0f && multiplier < 1.0f);</div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  <span class="keywordflow">if</span> (multiplier == 0.0f)</div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>  {</div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  m_Multiplier = 0;</div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  m_RightShift = 0;</div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  }</div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  {</div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  <span class="keyword">const</span> <span class="keywordtype">double</span> q = std::frexp(multiplier, &m_RightShift);</div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  m_RightShift = -m_RightShift;</div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  int64_t qFixed = <span class="keyword">static_cast<</span>int64_t<span class="keyword">></span>(::round(q * (1ll << 31)));</div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  <a class="code" href="_assert_8hpp.html#a5698be69cbd5dfe6c28fcd9867e8cbed">ARMNN_ASSERT</a>(qFixed <= (1ll << 31));</div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  <span class="keywordflow">if</span> (qFixed == (1ll << 31))</div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  {</div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  qFixed /= 2;</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  --m_RightShift;</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  }</div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <a class="code" href="_assert_8hpp.html#a5698be69cbd5dfe6c28fcd9867e8cbed">ARMNN_ASSERT</a>(m_RightShift >= 0);</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <a class="code" href="_assert_8hpp.html#a5698be69cbd5dfe6c28fcd9867e8cbed">ARMNN_ASSERT</a>(qFixed <= std::numeric_limits<int32_t>::max());</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  m_Multiplier = <span class="keyword">static_cast<</span>int32_t<span class="keyword">></span>(qFixed);</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  }</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> }</div>
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<p class="reference">References <a class="el" href="_assert_8hpp_source.html#l00014">ARMNN_ASSERT</a>.</p>
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<h2 class="groupheader">Member Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#ac04834893e568dfea4642ecb575faed8">◆ </a></span>operator*()</h2>
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<td class="memname">int32_t operator* </td>
<td>(</td>
<td class="paramtype">int32_t </td>
<td class="paramname"><em>rhs</em></td><td>)</td>
<td> const</td>
</tr>
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<p>The implementation of this function is adapted from Android NN's MultiplyByQuantizedMultiplierSmallerThanOne(). </p>
<p class="definition">Definition at line <a class="el" href="_conv_impl_8cpp_source.html#l00041">41</a> of file <a class="el" href="_conv_impl_8cpp_source.html">ConvImpl.cpp</a>.</p>
<div class="fragment"><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> {</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  int32_t x = SaturatingRoundingDoublingHighMul(rhs, m_Multiplier);</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="keywordflow">return</span> RoundingDivideByPOT(x, m_RightShift);</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> }</div>
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<hr/>The documentation for this struct was generated from the following files:<ul>
<li>src/backends/reference/workloads/<a class="el" href="_conv_impl_8hpp_source.html">ConvImpl.hpp</a></li>
<li>src/backends/reference/workloads/<a class="el" href="_conv_impl_8cpp_source.html">ConvImpl.cpp</a></li>
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