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<div class="title">dotproductfma.cpp</div> </div>
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<a href="a00089.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// File: dotproductfma.cpp</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// Description: Architecture-specific dot-product function.</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">// Author: Stefan Weil</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">//</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">// (C) Copyright 2015, Google Inc.</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">// Licensed under the Apache License, Version 2.0 (the "License");</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">// you may not use this file except in compliance with the License.</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">// You may obtain a copy of the License at</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment">// http://www.apache.org/licenses/LICENSE-2.0</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment">// Unless required by applicable law or agreed to in writing, software</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment">// distributed under the License is distributed on an "AS IS" BASIS,</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment">// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment">// See the License for the specific language governing permissions and</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment">// limitations under the License.</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"></span> </div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="preprocessor">#if !defined(__FMA__)</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="preprocessor">#error Implementation only for FMA capable architectures</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  </div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="preprocessor">#include <immintrin.h></span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor">#include <cstdint></span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor">#include "<a class="code" href="a00083.html">dotproduct.h</a>"</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">namespace </span><a class="code" href="a01818.html">tesseract</a> {</div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  </div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment">// Computes and returns the dot product of the n-vectors u and v.</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment">// Uses Intel FMA intrinsics to access the SIMD instruction set.</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"><a class="line" href="a01818.html#ab1837ad1dc5a0a43ba1b08e888a0f620"> 30</a></span> <span class="keywordtype">double</span> <a class="code" href="a01818.html#ab1837ad1dc5a0a43ba1b08e888a0f620">DotProductFMA</a>(<span class="keyword">const</span> <span class="keywordtype">double</span>* u, <span class="keyword">const</span> <span class="keywordtype">double</span>* v, <span class="keywordtype">int</span> n) {</div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  <span class="keyword">const</span> <span class="keywordtype">unsigned</span> quot = n / 8;</div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  <span class="keyword">const</span> <span class="keywordtype">unsigned</span> rem = n % 8;</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  __m256d t0 = _mm256_setzero_pd();</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  __m256d t1 = _mm256_setzero_pd();</div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> k = 0; k < quot; k++) {</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  __m256d f0 = _mm256_loadu_pd(u);</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  __m256d f1 = _mm256_loadu_pd(v);</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  t0 = _mm256_fmadd_pd(f0, f1, t0);</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  u += 4;</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  v += 4;</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  __m256d f2 = _mm256_loadu_pd(u);</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  __m256d f3 = _mm256_loadu_pd(v);</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  t1 = _mm256_fmadd_pd(f2, f3, t1);</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  u += 4;</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  v += 4;</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  }</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  t0 = _mm256_hadd_pd(t0, t1);</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="keyword">alignas</span>(32) <span class="keywordtype">double</span> tmp[4];</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  _mm256_store_pd(tmp, t0);</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="keywordtype">double</span> result = tmp[0] + tmp[1] + tmp[2] + tmp[3];</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> k = 0; k < rem; k++) {</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  result += *u++ * *v++;</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  }</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="keywordflow">return</span> result;</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> }</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  </div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> } <span class="comment">// namespace tesseract.</span></div>
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<div class="ttc" id="aa01818_html_ab1837ad1dc5a0a43ba1b08e888a0f620"><div class="ttname"><a href="a01818.html#ab1837ad1dc5a0a43ba1b08e888a0f620">tesseract::DotProductFMA</a></div><div class="ttdeci">double DotProductFMA(const double *u, const double *v, int n)</div><div class="ttdef"><b>Definition:</b> <a href="a00089_source.html#l00030">dotproductfma.cpp:30</a></div></div>
<div class="ttc" id="aa00083_html"><div class="ttname"><a href="a00083.html">dotproduct.h</a></div></div>
<div class="ttc" id="aa01818_html"><div class="ttname"><a href="a01818.html">tesseract</a></div><div class="ttdef"><b>Definition:</b> <a href="a00005_source.html#l00065">baseapi.h:65</a></div></div>
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