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<div class="title">dotproductsse.cpp</div> </div>
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<a href="a00092.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: dotproductsse.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: Ray Smith</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(__SSE4_1__)</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="preprocessor">#error Implementation only for SSE 4.1 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 <emmintrin.h></span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor">#include <smmintrin.h></span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor">#include <cstdint></span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor">#include "<a class="code" href="a00083.html">dotproduct.h</a>"</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  </div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="keyword">namespace </span><a class="code" href="a01818.html">tesseract</a> {</div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  </div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment">// Computes and returns the dot product of the n-vectors u and v.</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment">// Uses Intel SSE intrinsics to access the SIMD instruction set.</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"><a class="line" href="a01818.html#ad3b5fe062bd97bc8cb1117a29fa24ac2"> 31</a></span> <span class="keywordtype">double</span> <a class="code" href="a01818.html#ad3b5fe062bd97bc8cb1117a29fa24ac2">DotProductSSE</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="l00032"></a><span class="lineno"> 32</span>  <span class="keywordtype">int</span> max_offset = n - 2;</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  <span class="keywordtype">int</span> offset = 0;</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <span class="comment">// Accumulate a set of 2 sums in sum, by loading pairs of 2 values from u and</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <span class="comment">// v, and multiplying them together in parallel.</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  __m128d sum = _mm_setzero_pd();</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <span class="keywordflow">if</span> (offset <= max_offset) {</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  offset = 2;</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="comment">// Aligned load is reputedly faster but requires 16 byte aligned input.</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="keywordflow">if</span> ((reinterpret_cast<uintptr_t>(u) & 15) == 0 &&</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  (reinterpret_cast<uintptr_t>(v) & 15) == 0) {</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="comment">// Use aligned load.</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  sum = _mm_load_pd(u);</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  __m128d floats2 = _mm_load_pd(v);</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="comment">// Multiply.</span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  sum = _mm_mul_pd(sum, floats2);</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="keywordflow">while</span> (offset <= max_offset) {</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  __m128d floats1 = _mm_load_pd(u + offset);</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  floats2 = _mm_load_pd(v + offset);</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  offset += 2;</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  floats1 = _mm_mul_pd(floats1, floats2);</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  sum = _mm_add_pd(sum, floats1);</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">else</span> {</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="comment">// Use unaligned load.</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  sum = _mm_loadu_pd(u);</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  __m128d floats2 = _mm_loadu_pd(v);</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="comment">// Multiply.</span></div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  sum = _mm_mul_pd(sum, floats2);</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="keywordflow">while</span> (offset <= max_offset) {</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  __m128d floats1 = _mm_loadu_pd(u + offset);</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  floats2 = _mm_loadu_pd(v + offset);</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  offset += 2;</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  floats1 = _mm_mul_pd(floats1, floats2);</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  sum = _mm_add_pd(sum, floats1);</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  }</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  }</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  }</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="comment">// Add the 2 sums in sum horizontally.</span></div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  sum = _mm_hadd_pd(sum, sum);</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="comment">// Extract the low result.</span></div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="keywordtype">double</span> result = _mm_cvtsd_f64(sum);</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="comment">// Add on any left-over products.</span></div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keywordflow">while</span> (offset < n) {</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  result += u[offset] * v[offset];</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  ++offset;</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  }</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="keywordflow">return</span> result;</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> }</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  </div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> } <span class="comment">// namespace tesseract.</span></div>
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<div class="ttc" id="aa01818_html_ad3b5fe062bd97bc8cb1117a29fa24ac2"><div class="ttname"><a href="a01818.html#ad3b5fe062bd97bc8cb1117a29fa24ac2">tesseract::DotProductSSE</a></div><div class="ttdeci">double DotProductSSE(const double *u, const double *v, int n)</div><div class="ttdef"><b>Definition:</b> <a href="a00092_source.html#l00031">dotproductsse.cpp:31</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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