<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=9"/>
<meta name="generator" content="Doxygen 1.8.5"/>
<title>Faiss: /data/users/hoss/faiss/utils_simd.cpp Source File</title>
<link href="tabs.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="dynsections.js"></script>
<link href="search/search.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="search/search.js"></script>
<script type="text/javascript">
$(document).ready(function() { searchBox.OnSelectItem(0); });
</script>
<link href="doxygen.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div id="top"><!-- do not remove this div, it is closed by doxygen! -->
<div id="titlearea">
<table cellspacing="0" cellpadding="0">
<tbody>
<tr style="height: 56px;">
<td style="padding-left: 0.5em;">
<div id="projectname">Faiss
</div>
</td>
</tr>
</tbody>
</table>
</div>
<!-- end header part -->
<!-- Generated by Doxygen 1.8.5 -->
<script type="text/javascript">
var searchBox = new SearchBox("searchBox", "search",false,'Search');
</script>
<div id="navrow1" class="tabs">
<ul class="tablist">
<li><a href="index.html"><span>Main Page</span></a></li>
<li><a href="namespaces.html"><span>Namespaces</span></a></li>
<li><a href="annotated.html"><span>Classes</span></a></li>
<li class="current"><a href="files.html"><span>Files</span></a></li>
<li>
<div id="MSearchBox" class="MSearchBoxInactive">
<span class="left">
<img id="MSearchSelect" src="search/mag_sel.png"
onmouseover="return searchBox.OnSearchSelectShow()"
onmouseout="return searchBox.OnSearchSelectHide()"
alt=""/>
<input type="text" id="MSearchField" value="Search" accesskey="S"
onfocus="searchBox.OnSearchFieldFocus(true)"
onblur="searchBox.OnSearchFieldFocus(false)"
onkeyup="searchBox.OnSearchFieldChange(event)"/>
</span><span class="right">
<a id="MSearchClose" href="javascript:searchBox.CloseResultsWindow()"><img id="MSearchCloseImg" border="0" src="search/close.png" alt=""/></a>
</span>
</div>
</li>
</ul>
</div>
<div id="navrow2" class="tabs2">
<ul class="tablist">
<li><a href="files.html"><span>File List</span></a></li>
</ul>
</div>
</div><!-- top -->
<!-- window showing the filter options -->
<div id="MSearchSelectWindow"
onmouseover="return searchBox.OnSearchSelectShow()"
onmouseout="return searchBox.OnSearchSelectHide()"
onkeydown="return searchBox.OnSearchSelectKey(event)">
<a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(0)"><span class="SelectionMark"> </span>All</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(1)"><span class="SelectionMark"> </span>Classes</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(2)"><span class="SelectionMark"> </span>Namespaces</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(3)"><span class="SelectionMark"> </span>Functions</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(4)"><span class="SelectionMark"> </span>Variables</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(5)"><span class="SelectionMark"> </span>Typedefs</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(6)"><span class="SelectionMark"> </span>Enumerations</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(7)"><span class="SelectionMark"> </span>Enumerator</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(8)"><span class="SelectionMark"> </span>Friends</a></div>
<!-- iframe showing the search results (closed by default) -->
<div id="MSearchResultsWindow">
<iframe src="javascript:void(0)" frameborder="0"
name="MSearchResults" id="MSearchResults">
</iframe>
</div>
<div class="header">
<div class="headertitle">
<div class="title">/data/users/hoss/faiss/utils_simd.cpp</div> </div>
</div><!--header-->
<div class="contents">
<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> * Copyright (c) Facebook, Inc. and its affiliates.</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * This source code is licensed under the MIT license found in the</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> * LICENSE file in the root directory of this source tree.</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> </div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">// -*- c++ -*-</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> </div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor">#include "utils.h"</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> </div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#include <cstdio></span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#include <cassert></span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#include <cstring></span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="preprocessor">#include <cmath></span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> </div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor">#ifdef __SSE__</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="preprocessor"></span><span class="preprocessor">#include <immintrin.h></span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="preprocessor">#ifdef __aarch64__</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="preprocessor"></span><span class="preprocessor">#include <arm_neon.h></span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor">#include <omp.h></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> </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">/**************************************************</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment"> * Get some stats about the system</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment"> **************************************************/</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> </div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="keyword">namespace </span>faiss {</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> <span class="preprocessor">#ifdef __AVX__</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="preprocessor"></span><span class="preprocessor">#define USE_AVX</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="preprocessor"></span><span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> </div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment">/*********************************************************</span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment"> * Optimized distance computations</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment"> *********************************************************/</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> </div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> </div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="comment">/* Functions to compute:</span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="comment"> - L2 distance between 2 vectors</span></div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="comment"> - inner product between 2 vectors</span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="comment"> - L2 norm of a vector</span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment"></span></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="comment"> The functions should probably not be invoked when a large number of</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="comment"> vectors are be processed in batch (in which case Matrix multiply</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="comment"> is faster), but may be useful for comparing vectors isolated in</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="comment"> memory.</span></div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="comment"></span></div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="comment"> Works with any vectors of any dimension, even unaligned (in which</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="comment"> case they are slower).</span></div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="comment"></span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="comment">*/</span></div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> </div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> </div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="comment">/*********************************************************</span></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="comment"> * Reference implementations</span></div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> </div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="comment">/* same without SSE */</span></div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="keywordtype">float</span> fvec_L2sqr_ref (<span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * y,</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keywordtype">size_t</span> d)</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> {</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="keywordtype">size_t</span> i;</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="keywordtype">float</span> res = 0;</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="keywordflow">for</span> (i = 0; i < d; i++) {</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> tmp = x[i] - y[i];</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  res += tmp * tmp;</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  }</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="keywordflow">return</span> res;</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> </div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="keywordtype">float</span> fvec_inner_product_ref (<span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * y,</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keywordtype">size_t</span> d)</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> {</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="keywordtype">size_t</span> i;</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="keywordtype">float</span> res = 0;</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="keywordflow">for</span> (i = 0; i < d; i++)</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  res += x[i] * y[i];</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="keywordflow">return</span> res;</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span> }</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span> </div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> <span class="keywordtype">float</span> fvec_norm_L2sqr_ref (<span class="keyword">const</span> <span class="keywordtype">float</span> *x, <span class="keywordtype">size_t</span> d)</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> {</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="keywordtype">size_t</span> i;</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="keywordtype">double</span> res = 0;</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="keywordflow">for</span> (i = 0; i < d; i++)</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  res += x[i] * x[i];</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="keywordflow">return</span> res;</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span> }</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> </div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span> </div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span> <span class="keywordtype">void</span> fvec_L2sqr_ny_ref (<span class="keywordtype">float</span> * dis,</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * y,</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="keywordtype">size_t</span> d, <span class="keywordtype">size_t</span> ny)</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span> {</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < ny; i++) {</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  dis[i] = <a class="code" href="namespacefaiss.html#a7466bd32de31640860393a701eaac5ad">fvec_L2sqr</a> (x, y, d);</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  y += d;</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  }</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span> }</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span> </div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span> </div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span> </div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span> </div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span> <span class="comment">/*********************************************************</span></div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span> <span class="comment"> * SSE and AVX implementations</span></div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> </div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> <span class="preprocessor">#ifdef __SSE__</span></div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span> <span class="comment">// reads 0 <= d < 4 floats as __m128</span></div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span> <span class="keyword">static</span> <span class="keyword">inline</span> __m128 masked_read (<span class="keywordtype">int</span> d, <span class="keyword">const</span> <span class="keywordtype">float</span> *x)</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span> {</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  assert (0 <= d && d < 4);</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  __attribute__((__aligned__(16))) float buf[4] = {0, 0, 0, 0};</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="keywordflow">switch</span> (d) {</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="keywordflow">case</span> 3:</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  buf[2] = x[2];</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  <span class="keywordflow">case</span> 2:</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  buf[1] = x[1];</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  <span class="keywordflow">case</span> 1:</div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  buf[0] = x[0];</div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  }</div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  <span class="keywordflow">return</span> _mm_load_ps (buf);</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  <span class="comment">// cannot use AVX2 _mm_mask_set1_epi32</span></div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span> }</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span> </div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span> <span class="keywordtype">float</span> <a class="code" href="namespacefaiss.html#a7a49180ebf10e643217bbce5862c7f84">fvec_norm_L2sqr</a> (<span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  <span class="keywordtype">size_t</span> d)</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span> {</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  __m128 mx;</div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  __m128 msum1 = _mm_setzero_ps();</div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span> </div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  <span class="keywordflow">while</span> (d >= 4) {</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  mx = _mm_loadu_ps (x); x += 4;</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  msum1 = _mm_add_ps (msum1, _mm_mul_ps (mx, mx));</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  d -= 4;</div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  }</div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span> </div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  mx = masked_read (d, x);</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  msum1 = _mm_add_ps (msum1, _mm_mul_ps (mx, mx));</div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span> </div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  msum1 = _mm_hadd_ps (msum1, msum1);</div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  msum1 = _mm_hadd_ps (msum1, msum1);</div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  <span class="keywordflow">return</span> _mm_cvtss_f32 (msum1);</div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span> }</div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span> </div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span> <span class="keyword">namespace </span>{</div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span> </div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span> <span class="keywordtype">float</span> sqr (<span class="keywordtype">float</span> x) {</div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  <span class="keywordflow">return</span> x * x;</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span> }</div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span> </div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span> </div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span> <span class="keywordtype">void</span> fvec_L2sqr_ny_D1 (<span class="keywordtype">float</span> * dis, <span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * y, <span class="keywordtype">size_t</span> ny)</div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span> {</div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  <span class="keywordtype">float</span> x0s = x[0];</div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  __m128 x0 = _mm_set_ps (x0s, x0s, x0s, x0s);</div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span> </div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  <span class="keywordtype">size_t</span> i;</div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  <span class="keywordflow">for</span> (i = 0; i + 3 < ny; i += 4) {</div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  __m128 tmp, accu;</div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  tmp = x0 - _mm_loadu_ps (y); y += 4;</div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  accu = tmp * tmp;</div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  dis[i] = _mm_cvtss_f32 (accu);</div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  tmp = _mm_shuffle_ps (accu, accu, 1);</div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  dis[i + 1] = _mm_cvtss_f32 (tmp);</div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  tmp = _mm_shuffle_ps (accu, accu, 2);</div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  dis[i + 2] = _mm_cvtss_f32 (tmp);</div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  tmp = _mm_shuffle_ps (accu, accu, 3);</div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  dis[i + 3] = _mm_cvtss_f32 (tmp);</div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  }</div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  <span class="keywordflow">while</span> (i < ny) { <span class="comment">// handle non-multiple-of-4 case</span></div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  dis[i++] = sqr(x0s - *y++);</div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  }</div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span> }</div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span> </div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span> </div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span> <span class="keywordtype">void</span> fvec_L2sqr_ny_D2 (<span class="keywordtype">float</span> * dis, <span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * y, <span class="keywordtype">size_t</span> ny)</div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span> {</div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  __m128 x0 = _mm_set_ps (x[1], x[0], x[1], x[0]);</div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span> </div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  <span class="keywordtype">size_t</span> i;</div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  <span class="keywordflow">for</span> (i = 0; i + 1 < ny; i += 2) {</div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  __m128 tmp, accu;</div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  tmp = x0 - _mm_loadu_ps (y); y += 4;</div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  accu = tmp * tmp;</div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  accu = _mm_hadd_ps (accu, accu);</div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  dis[i] = _mm_cvtss_f32 (accu);</div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  accu = _mm_shuffle_ps (accu, accu, 3);</div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  dis[i + 1] = _mm_cvtss_f32 (accu);</div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  }</div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  <span class="keywordflow">if</span> (i < ny) { <span class="comment">// handle odd case</span></div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  dis[i] = sqr(x[0] - y[0]) + sqr(x[1] - y[1]);</div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  }</div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span> }</div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span> </div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span> </div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span> </div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span> <span class="keywordtype">void</span> fvec_L2sqr_ny_D4 (<span class="keywordtype">float</span> * dis, <span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * y, <span class="keywordtype">size_t</span> ny)</div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span> {</div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  __m128 x0 = _mm_loadu_ps(x);</div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span> </div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < ny; i++) {</div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  __m128 tmp, accu;</div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  tmp = x0 - _mm_loadu_ps (y); y += 4;</div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  accu = tmp * tmp;</div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  accu = _mm_hadd_ps (accu, accu);</div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  accu = _mm_hadd_ps (accu, accu);</div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  dis[i] = _mm_cvtss_f32 (accu);</div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  }</div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span> }</div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span> </div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span> </div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span> <span class="keywordtype">void</span> fvec_L2sqr_ny_D8 (<span class="keywordtype">float</span> * dis, <span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * y, <span class="keywordtype">size_t</span> ny)</div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span> {</div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  __m128 x0 = _mm_loadu_ps(x);</div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  __m128 x1 = _mm_loadu_ps(x + 4);</div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span> </div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < ny; i++) {</div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span>  __m128 tmp, accu;</div>
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  tmp = x0 - _mm_loadu_ps (y); y += 4;</div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  accu = tmp * tmp;</div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  tmp = x1 - _mm_loadu_ps (y); y += 4;</div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  accu += tmp * tmp;</div>
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  accu = _mm_hadd_ps (accu, accu);</div>
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  accu = _mm_hadd_ps (accu, accu);</div>
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  dis[i] = _mm_cvtss_f32 (accu);</div>
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  }</div>
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span> }</div>
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span> </div>
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span> </div>
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span> <span class="keywordtype">void</span> fvec_L2sqr_ny_D12 (<span class="keywordtype">float</span> * dis, <span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * y, <span class="keywordtype">size_t</span> ny)</div>
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span> {</div>
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  __m128 x0 = _mm_loadu_ps(x);</div>
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  __m128 x1 = _mm_loadu_ps(x + 4);</div>
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  __m128 x2 = _mm_loadu_ps(x + 8);</div>
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span> </div>
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < ny; i++) {</div>
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  __m128 tmp, accu;</div>
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  tmp = x0 - _mm_loadu_ps (y); y += 4;</div>
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  accu = tmp * tmp;</div>
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  tmp = x1 - _mm_loadu_ps (y); y += 4;</div>
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  accu += tmp * tmp;</div>
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  tmp = x2 - _mm_loadu_ps (y); y += 4;</div>
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span>  accu += tmp * tmp;</div>
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span>  accu = _mm_hadd_ps (accu, accu);</div>
<div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  accu = _mm_hadd_ps (accu, accu);</div>
<div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  dis[i] = _mm_cvtss_f32 (accu);</div>
<div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  }</div>
<div class="line"><a name="l00265"></a><span class="lineno"> 265</span> }</div>
<div class="line"><a name="l00266"></a><span class="lineno"> 266</span> </div>
<div class="line"><a name="l00267"></a><span class="lineno"> 267</span> </div>
<div class="line"><a name="l00268"></a><span class="lineno"> 268</span> } <span class="comment">// anonymous namespace</span></div>
<div class="line"><a name="l00269"></a><span class="lineno"> 269</span> </div>
<div class="line"><a name="l00270"></a><span class="lineno"> 270</span> <span class="keywordtype">void</span> fvec_L2sqr_ny (<span class="keywordtype">float</span> * dis, <span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * y, <span class="keywordtype">size_t</span> d, <span class="keywordtype">size_t</span> ny) {</div>
<div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  <span class="comment">// optimized for a few special cases</span></div>
<div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  <span class="keywordflow">switch</span>(d) {</div>
<div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  <span class="keywordflow">case</span> 1:</div>
<div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  fvec_L2sqr_ny_D1 (dis, x, y, ny);</div>
<div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  <span class="keywordflow">case</span> 2:</div>
<div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  fvec_L2sqr_ny_D2 (dis, x, y, ny);</div>
<div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  <span class="keywordflow">case</span> 4:</div>
<div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  fvec_L2sqr_ny_D4 (dis, x, y, ny);</div>
<div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00283"></a><span class="lineno"> 283</span>  <span class="keywordflow">case</span> 8:</div>
<div class="line"><a name="l00284"></a><span class="lineno"> 284</span>  fvec_L2sqr_ny_D8 (dis, x, y, ny);</div>
<div class="line"><a name="l00285"></a><span class="lineno"> 285</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00286"></a><span class="lineno"> 286</span>  <span class="keywordflow">case</span> 12:</div>
<div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  fvec_L2sqr_ny_D12 (dis, x, y, ny);</div>
<div class="line"><a name="l00288"></a><span class="lineno"> 288</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00289"></a><span class="lineno"> 289</span>  <span class="keywordflow">default</span>:</div>
<div class="line"><a name="l00290"></a><span class="lineno"> 290</span>  fvec_L2sqr_ny_ref (dis, x, y, d, ny);</div>
<div class="line"><a name="l00291"></a><span class="lineno"> 291</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00292"></a><span class="lineno"> 292</span>  }</div>
<div class="line"><a name="l00293"></a><span class="lineno"> 293</span> }</div>
<div class="line"><a name="l00294"></a><span class="lineno"> 294</span> </div>
<div class="line"><a name="l00295"></a><span class="lineno"> 295</span> </div>
<div class="line"><a name="l00296"></a><span class="lineno"> 296</span> </div>
<div class="line"><a name="l00297"></a><span class="lineno"> 297</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00298"></a><span class="lineno"> 298</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00299"></a><span class="lineno"> 299</span> <span class="preprocessor">#ifdef USE_AVX</span></div>
<div class="line"><a name="l00300"></a><span class="lineno"> 300</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00301"></a><span class="lineno"> 301</span> <span class="comment">// reads 0 <= d < 8 floats as __m256</span></div>
<div class="line"><a name="l00302"></a><span class="lineno"> 302</span> <span class="keyword">static</span> <span class="keyword">inline</span> __m256 masked_read_8 (<span class="keywordtype">int</span> d, <span class="keyword">const</span> <span class="keywordtype">float</span> *x)</div>
<div class="line"><a name="l00303"></a><span class="lineno"> 303</span> {</div>
<div class="line"><a name="l00304"></a><span class="lineno"> 304</span>  assert (0 <= d && d < 8);</div>
<div class="line"><a name="l00305"></a><span class="lineno"> 305</span>  <span class="keywordflow">if</span> (d < 4) {</div>
<div class="line"><a name="l00306"></a><span class="lineno"> 306</span>  __m256 res = _mm256_setzero_ps ();</div>
<div class="line"><a name="l00307"></a><span class="lineno"> 307</span>  res = _mm256_insertf128_ps (res, masked_read (d, x), 0);</div>
<div class="line"><a name="l00308"></a><span class="lineno"> 308</span>  <span class="keywordflow">return</span> res;</div>
<div class="line"><a name="l00309"></a><span class="lineno"> 309</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00310"></a><span class="lineno"> 310</span>  __m256 res = _mm256_setzero_ps ();</div>
<div class="line"><a name="l00311"></a><span class="lineno"> 311</span>  res = _mm256_insertf128_ps (res, _mm_loadu_ps (x), 0);</div>
<div class="line"><a name="l00312"></a><span class="lineno"> 312</span>  res = _mm256_insertf128_ps (res, masked_read (d - 4, x + 4), 1);</div>
<div class="line"><a name="l00313"></a><span class="lineno"> 313</span>  <span class="keywordflow">return</span> res;</div>
<div class="line"><a name="l00314"></a><span class="lineno"> 314</span>  }</div>
<div class="line"><a name="l00315"></a><span class="lineno"> 315</span> }</div>
<div class="line"><a name="l00316"></a><span class="lineno"> 316</span> </div>
<div class="line"><a name="l00317"></a><span class="lineno"> 317</span> <span class="keywordtype">float</span> fvec_inner_product (<span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00318"></a><span class="lineno"> 318</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * y,</div>
<div class="line"><a name="l00319"></a><span class="lineno"> 319</span>  <span class="keywordtype">size_t</span> d)</div>
<div class="line"><a name="l00320"></a><span class="lineno"> 320</span> {</div>
<div class="line"><a name="l00321"></a><span class="lineno"> 321</span>  __m256 msum1 = _mm256_setzero_ps();</div>
<div class="line"><a name="l00322"></a><span class="lineno"> 322</span> </div>
<div class="line"><a name="l00323"></a><span class="lineno"> 323</span>  <span class="keywordflow">while</span> (d >= 8) {</div>
<div class="line"><a name="l00324"></a><span class="lineno"> 324</span>  __m256 mx = _mm256_loadu_ps (x); x += 8;</div>
<div class="line"><a name="l00325"></a><span class="lineno"> 325</span>  __m256 my = _mm256_loadu_ps (y); y += 8;</div>
<div class="line"><a name="l00326"></a><span class="lineno"> 326</span>  msum1 = _mm256_add_ps (msum1, _mm256_mul_ps (mx, my));</div>
<div class="line"><a name="l00327"></a><span class="lineno"> 327</span>  d -= 8;</div>
<div class="line"><a name="l00328"></a><span class="lineno"> 328</span>  }</div>
<div class="line"><a name="l00329"></a><span class="lineno"> 329</span> </div>
<div class="line"><a name="l00330"></a><span class="lineno"> 330</span>  __m128 msum2 = _mm256_extractf128_ps(msum1, 1);</div>
<div class="line"><a name="l00331"></a><span class="lineno"> 331</span>  msum2 += _mm256_extractf128_ps(msum1, 0);</div>
<div class="line"><a name="l00332"></a><span class="lineno"> 332</span> </div>
<div class="line"><a name="l00333"></a><span class="lineno"> 333</span>  <span class="keywordflow">if</span> (d >= 4) {</div>
<div class="line"><a name="l00334"></a><span class="lineno"> 334</span>  __m128 mx = _mm_loadu_ps (x); x += 4;</div>
<div class="line"><a name="l00335"></a><span class="lineno"> 335</span>  __m128 my = _mm_loadu_ps (y); y += 4;</div>
<div class="line"><a name="l00336"></a><span class="lineno"> 336</span>  msum2 = _mm_add_ps (msum2, _mm_mul_ps (mx, my));</div>
<div class="line"><a name="l00337"></a><span class="lineno"> 337</span>  d -= 4;</div>
<div class="line"><a name="l00338"></a><span class="lineno"> 338</span>  }</div>
<div class="line"><a name="l00339"></a><span class="lineno"> 339</span> </div>
<div class="line"><a name="l00340"></a><span class="lineno"> 340</span>  <span class="keywordflow">if</span> (d > 0) {</div>
<div class="line"><a name="l00341"></a><span class="lineno"> 341</span>  __m128 mx = masked_read (d, x);</div>
<div class="line"><a name="l00342"></a><span class="lineno"> 342</span>  __m128 my = masked_read (d, y);</div>
<div class="line"><a name="l00343"></a><span class="lineno"> 343</span>  msum2 = _mm_add_ps (msum2, _mm_mul_ps (mx, my));</div>
<div class="line"><a name="l00344"></a><span class="lineno"> 344</span>  }</div>
<div class="line"><a name="l00345"></a><span class="lineno"> 345</span> </div>
<div class="line"><a name="l00346"></a><span class="lineno"> 346</span>  msum2 = _mm_hadd_ps (msum2, msum2);</div>
<div class="line"><a name="l00347"></a><span class="lineno"> 347</span>  msum2 = _mm_hadd_ps (msum2, msum2);</div>
<div class="line"><a name="l00348"></a><span class="lineno"> 348</span>  <span class="keywordflow">return</span> _mm_cvtss_f32 (msum2);</div>
<div class="line"><a name="l00349"></a><span class="lineno"> 349</span> }</div>
<div class="line"><a name="l00350"></a><span class="lineno"> 350</span> </div>
<div class="line"><a name="l00351"></a><span class="lineno"> 351</span> <span class="keywordtype">float</span> <a class="code" href="namespacefaiss.html#a7466bd32de31640860393a701eaac5ad">fvec_L2sqr</a> (<span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00352"></a><span class="lineno"> 352</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * y,</div>
<div class="line"><a name="l00353"></a><span class="lineno"> 353</span>  <span class="keywordtype">size_t</span> d)</div>
<div class="line"><a name="l00354"></a><span class="lineno"> 354</span> {</div>
<div class="line"><a name="l00355"></a><span class="lineno"> 355</span>  __m256 msum1 = _mm256_setzero_ps();</div>
<div class="line"><a name="l00356"></a><span class="lineno"> 356</span> </div>
<div class="line"><a name="l00357"></a><span class="lineno"> 357</span>  <span class="keywordflow">while</span> (d >= 8) {</div>
<div class="line"><a name="l00358"></a><span class="lineno"> 358</span>  __m256 mx = _mm256_loadu_ps (x); x += 8;</div>
<div class="line"><a name="l00359"></a><span class="lineno"> 359</span>  __m256 my = _mm256_loadu_ps (y); y += 8;</div>
<div class="line"><a name="l00360"></a><span class="lineno"> 360</span>  <span class="keyword">const</span> __m256 a_m_b1 = mx - my;</div>
<div class="line"><a name="l00361"></a><span class="lineno"> 361</span>  msum1 += a_m_b1 * a_m_b1;</div>
<div class="line"><a name="l00362"></a><span class="lineno"> 362</span>  d -= 8;</div>
<div class="line"><a name="l00363"></a><span class="lineno"> 363</span>  }</div>
<div class="line"><a name="l00364"></a><span class="lineno"> 364</span> </div>
<div class="line"><a name="l00365"></a><span class="lineno"> 365</span>  __m128 msum2 = _mm256_extractf128_ps(msum1, 1);</div>
<div class="line"><a name="l00366"></a><span class="lineno"> 366</span>  msum2 += _mm256_extractf128_ps(msum1, 0);</div>
<div class="line"><a name="l00367"></a><span class="lineno"> 367</span> </div>
<div class="line"><a name="l00368"></a><span class="lineno"> 368</span>  <span class="keywordflow">if</span> (d >= 4) {</div>
<div class="line"><a name="l00369"></a><span class="lineno"> 369</span>  __m128 mx = _mm_loadu_ps (x); x += 4;</div>
<div class="line"><a name="l00370"></a><span class="lineno"> 370</span>  __m128 my = _mm_loadu_ps (y); y += 4;</div>
<div class="line"><a name="l00371"></a><span class="lineno"> 371</span>  <span class="keyword">const</span> __m128 a_m_b1 = mx - my;</div>
<div class="line"><a name="l00372"></a><span class="lineno"> 372</span>  msum2 += a_m_b1 * a_m_b1;</div>
<div class="line"><a name="l00373"></a><span class="lineno"> 373</span>  d -= 4;</div>
<div class="line"><a name="l00374"></a><span class="lineno"> 374</span>  }</div>
<div class="line"><a name="l00375"></a><span class="lineno"> 375</span> </div>
<div class="line"><a name="l00376"></a><span class="lineno"> 376</span>  <span class="keywordflow">if</span> (d > 0) {</div>
<div class="line"><a name="l00377"></a><span class="lineno"> 377</span>  __m128 mx = masked_read (d, x);</div>
<div class="line"><a name="l00378"></a><span class="lineno"> 378</span>  __m128 my = masked_read (d, y);</div>
<div class="line"><a name="l00379"></a><span class="lineno"> 379</span>  __m128 a_m_b1 = mx - my;</div>
<div class="line"><a name="l00380"></a><span class="lineno"> 380</span>  msum2 += a_m_b1 * a_m_b1;</div>
<div class="line"><a name="l00381"></a><span class="lineno"> 381</span>  }</div>
<div class="line"><a name="l00382"></a><span class="lineno"> 382</span> </div>
<div class="line"><a name="l00383"></a><span class="lineno"> 383</span>  msum2 = _mm_hadd_ps (msum2, msum2);</div>
<div class="line"><a name="l00384"></a><span class="lineno"> 384</span>  msum2 = _mm_hadd_ps (msum2, msum2);</div>
<div class="line"><a name="l00385"></a><span class="lineno"> 385</span>  <span class="keywordflow">return</span> _mm_cvtss_f32 (msum2);</div>
<div class="line"><a name="l00386"></a><span class="lineno"> 386</span> }</div>
<div class="line"><a name="l00387"></a><span class="lineno"> 387</span> </div>
<div class="line"><a name="l00388"></a><span class="lineno"> 388</span> <span class="preprocessor">#elif defined(__SSE__)</span></div>
<div class="line"><a name="l00389"></a><span class="lineno"> 389</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00390"></a><span class="lineno"> 390</span> <span class="comment">/* SSE-implementation of L2 distance */</span></div>
<div class="line"><a name="l00391"></a><span class="lineno"> 391</span> <span class="keywordtype">float</span> <a class="code" href="namespacefaiss.html#a7466bd32de31640860393a701eaac5ad">fvec_L2sqr</a> (<span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00392"></a><span class="lineno"> 392</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * y,</div>
<div class="line"><a name="l00393"></a><span class="lineno"> 393</span>  <span class="keywordtype">size_t</span> d)</div>
<div class="line"><a name="l00394"></a><span class="lineno"> 394</span> {</div>
<div class="line"><a name="l00395"></a><span class="lineno"> 395</span>  __m128 msum1 = _mm_setzero_ps();</div>
<div class="line"><a name="l00396"></a><span class="lineno"> 396</span> </div>
<div class="line"><a name="l00397"></a><span class="lineno"> 397</span>  <span class="keywordflow">while</span> (d >= 4) {</div>
<div class="line"><a name="l00398"></a><span class="lineno"> 398</span>  __m128 mx = _mm_loadu_ps (x); x += 4;</div>
<div class="line"><a name="l00399"></a><span class="lineno"> 399</span>  __m128 my = _mm_loadu_ps (y); y += 4;</div>
<div class="line"><a name="l00400"></a><span class="lineno"> 400</span>  <span class="keyword">const</span> __m128 a_m_b1 = mx - my;</div>
<div class="line"><a name="l00401"></a><span class="lineno"> 401</span>  msum1 += a_m_b1 * a_m_b1;</div>
<div class="line"><a name="l00402"></a><span class="lineno"> 402</span>  d -= 4;</div>
<div class="line"><a name="l00403"></a><span class="lineno"> 403</span>  }</div>
<div class="line"><a name="l00404"></a><span class="lineno"> 404</span> </div>
<div class="line"><a name="l00405"></a><span class="lineno"> 405</span>  <span class="keywordflow">if</span> (d > 0) {</div>
<div class="line"><a name="l00406"></a><span class="lineno"> 406</span>  <span class="comment">// add the last 1, 2 or 3 values</span></div>
<div class="line"><a name="l00407"></a><span class="lineno"> 407</span>  __m128 mx = masked_read (d, x);</div>
<div class="line"><a name="l00408"></a><span class="lineno"> 408</span>  __m128 my = masked_read (d, y);</div>
<div class="line"><a name="l00409"></a><span class="lineno"> 409</span>  __m128 a_m_b1 = mx - my;</div>
<div class="line"><a name="l00410"></a><span class="lineno"> 410</span>  msum1 += a_m_b1 * a_m_b1;</div>
<div class="line"><a name="l00411"></a><span class="lineno"> 411</span>  }</div>
<div class="line"><a name="l00412"></a><span class="lineno"> 412</span> </div>
<div class="line"><a name="l00413"></a><span class="lineno"> 413</span>  msum1 = _mm_hadd_ps (msum1, msum1);</div>
<div class="line"><a name="l00414"></a><span class="lineno"> 414</span>  msum1 = _mm_hadd_ps (msum1, msum1);</div>
<div class="line"><a name="l00415"></a><span class="lineno"> 415</span>  <span class="keywordflow">return</span> _mm_cvtss_f32 (msum1);</div>
<div class="line"><a name="l00416"></a><span class="lineno"> 416</span> }</div>
<div class="line"><a name="l00417"></a><span class="lineno"> 417</span> </div>
<div class="line"><a name="l00418"></a><span class="lineno"> 418</span> </div>
<div class="line"><a name="l00419"></a><span class="lineno"> 419</span> <span class="keywordtype">float</span> fvec_inner_product (<span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00420"></a><span class="lineno"> 420</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * y,</div>
<div class="line"><a name="l00421"></a><span class="lineno"> 421</span>  <span class="keywordtype">size_t</span> d)</div>
<div class="line"><a name="l00422"></a><span class="lineno"> 422</span> {</div>
<div class="line"><a name="l00423"></a><span class="lineno"> 423</span>  __m128 mx, my;</div>
<div class="line"><a name="l00424"></a><span class="lineno"> 424</span>  __m128 msum1 = _mm_setzero_ps();</div>
<div class="line"><a name="l00425"></a><span class="lineno"> 425</span> </div>
<div class="line"><a name="l00426"></a><span class="lineno"> 426</span>  <span class="keywordflow">while</span> (d >= 4) {</div>
<div class="line"><a name="l00427"></a><span class="lineno"> 427</span>  mx = _mm_loadu_ps (x); x += 4;</div>
<div class="line"><a name="l00428"></a><span class="lineno"> 428</span>  my = _mm_loadu_ps (y); y += 4;</div>
<div class="line"><a name="l00429"></a><span class="lineno"> 429</span>  msum1 = _mm_add_ps (msum1, _mm_mul_ps (mx, my));</div>
<div class="line"><a name="l00430"></a><span class="lineno"> 430</span>  d -= 4;</div>
<div class="line"><a name="l00431"></a><span class="lineno"> 431</span>  }</div>
<div class="line"><a name="l00432"></a><span class="lineno"> 432</span> </div>
<div class="line"><a name="l00433"></a><span class="lineno"> 433</span>  <span class="comment">// add the last 1, 2, or 3 values</span></div>
<div class="line"><a name="l00434"></a><span class="lineno"> 434</span>  mx = masked_read (d, x);</div>
<div class="line"><a name="l00435"></a><span class="lineno"> 435</span>  my = masked_read (d, y);</div>
<div class="line"><a name="l00436"></a><span class="lineno"> 436</span>  __m128 prod = _mm_mul_ps (mx, my);</div>
<div class="line"><a name="l00437"></a><span class="lineno"> 437</span> </div>
<div class="line"><a name="l00438"></a><span class="lineno"> 438</span>  msum1 = _mm_add_ps (msum1, prod);</div>
<div class="line"><a name="l00439"></a><span class="lineno"> 439</span> </div>
<div class="line"><a name="l00440"></a><span class="lineno"> 440</span>  msum1 = _mm_hadd_ps (msum1, msum1);</div>
<div class="line"><a name="l00441"></a><span class="lineno"> 441</span>  msum1 = _mm_hadd_ps (msum1, msum1);</div>
<div class="line"><a name="l00442"></a><span class="lineno"> 442</span>  <span class="keywordflow">return</span> _mm_cvtss_f32 (msum1);</div>
<div class="line"><a name="l00443"></a><span class="lineno"> 443</span> }</div>
<div class="line"><a name="l00444"></a><span class="lineno"> 444</span> </div>
<div class="line"><a name="l00445"></a><span class="lineno"> 445</span> <span class="preprocessor">#elif defined(__aarch64__)</span></div>
<div class="line"><a name="l00446"></a><span class="lineno"> 446</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00447"></a><span class="lineno"> 447</span> </div>
<div class="line"><a name="l00448"></a><span class="lineno"> 448</span> <span class="keywordtype">float</span> <a class="code" href="namespacefaiss.html#a7466bd32de31640860393a701eaac5ad">fvec_L2sqr</a> (<span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00449"></a><span class="lineno"> 449</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * y,</div>
<div class="line"><a name="l00450"></a><span class="lineno"> 450</span>  <span class="keywordtype">size_t</span> d)</div>
<div class="line"><a name="l00451"></a><span class="lineno"> 451</span> {</div>
<div class="line"><a name="l00452"></a><span class="lineno"> 452</span>  <span class="keywordflow">if</span> (d & 3) <span class="keywordflow">return</span> fvec_L2sqr_ref (x, y, d);</div>
<div class="line"><a name="l00453"></a><span class="lineno"> 453</span>  float32x4_t accu = vdupq_n_f32 (0);</div>
<div class="line"><a name="l00454"></a><span class="lineno"> 454</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < d; i += 4) {</div>
<div class="line"><a name="l00455"></a><span class="lineno"> 455</span>  float32x4_t xi = vld1q_f32 (x + i);</div>
<div class="line"><a name="l00456"></a><span class="lineno"> 456</span>  float32x4_t yi = vld1q_f32 (y + i);</div>
<div class="line"><a name="l00457"></a><span class="lineno"> 457</span>  float32x4_t sq = vsubq_f32 (xi, yi);</div>
<div class="line"><a name="l00458"></a><span class="lineno"> 458</span>  accu = vfmaq_f32 (accu, sq, sq);</div>
<div class="line"><a name="l00459"></a><span class="lineno"> 459</span>  }</div>
<div class="line"><a name="l00460"></a><span class="lineno"> 460</span>  float32x4_t a2 = vpaddq_f32 (accu, accu);</div>
<div class="line"><a name="l00461"></a><span class="lineno"> 461</span>  <span class="keywordflow">return</span> vdups_laneq_f32 (a2, 0) + vdups_laneq_f32 (a2, 1);</div>
<div class="line"><a name="l00462"></a><span class="lineno"> 462</span> }</div>
<div class="line"><a name="l00463"></a><span class="lineno"> 463</span> </div>
<div class="line"><a name="l00464"></a><span class="lineno"> 464</span> <span class="keywordtype">float</span> fvec_inner_product (<span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00465"></a><span class="lineno"> 465</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * y,</div>
<div class="line"><a name="l00466"></a><span class="lineno"> 466</span>  <span class="keywordtype">size_t</span> d)</div>
<div class="line"><a name="l00467"></a><span class="lineno"> 467</span> {</div>
<div class="line"><a name="l00468"></a><span class="lineno"> 468</span>  <span class="keywordflow">if</span> (d & 3) <span class="keywordflow">return</span> fvec_inner_product_ref (x, y, d);</div>
<div class="line"><a name="l00469"></a><span class="lineno"> 469</span>  float32x4_t accu = vdupq_n_f32 (0);</div>
<div class="line"><a name="l00470"></a><span class="lineno"> 470</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < d; i += 4) {</div>
<div class="line"><a name="l00471"></a><span class="lineno"> 471</span>  float32x4_t xi = vld1q_f32 (x + i);</div>
<div class="line"><a name="l00472"></a><span class="lineno"> 472</span>  float32x4_t yi = vld1q_f32 (y + i);</div>
<div class="line"><a name="l00473"></a><span class="lineno"> 473</span>  accu = vfmaq_f32 (accu, xi, yi);</div>
<div class="line"><a name="l00474"></a><span class="lineno"> 474</span>  }</div>
<div class="line"><a name="l00475"></a><span class="lineno"> 475</span>  float32x4_t a2 = vpaddq_f32 (accu, accu);</div>
<div class="line"><a name="l00476"></a><span class="lineno"> 476</span>  <span class="keywordflow">return</span> vdups_laneq_f32 (a2, 0) + vdups_laneq_f32 (a2, 1);</div>
<div class="line"><a name="l00477"></a><span class="lineno"> 477</span> }</div>
<div class="line"><a name="l00478"></a><span class="lineno"> 478</span> </div>
<div class="line"><a name="l00479"></a><span class="lineno"> 479</span> <span class="keywordtype">float</span> <a class="code" href="namespacefaiss.html#a7a49180ebf10e643217bbce5862c7f84">fvec_norm_L2sqr</a> (<span class="keyword">const</span> <span class="keywordtype">float</span> *x, <span class="keywordtype">size_t</span> d)</div>
<div class="line"><a name="l00480"></a><span class="lineno"> 480</span> {</div>
<div class="line"><a name="l00481"></a><span class="lineno"> 481</span>  <span class="keywordflow">if</span> (d & 3) <span class="keywordflow">return</span> fvec_norm_L2sqr_ref (x, d);</div>
<div class="line"><a name="l00482"></a><span class="lineno"> 482</span>  float32x4_t accu = vdupq_n_f32 (0);</div>
<div class="line"><a name="l00483"></a><span class="lineno"> 483</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < d; i += 4) {</div>
<div class="line"><a name="l00484"></a><span class="lineno"> 484</span>  float32x4_t xi = vld1q_f32 (x + i);</div>
<div class="line"><a name="l00485"></a><span class="lineno"> 485</span>  accu = vfmaq_f32 (accu, xi, xi);</div>
<div class="line"><a name="l00486"></a><span class="lineno"> 486</span>  }</div>
<div class="line"><a name="l00487"></a><span class="lineno"> 487</span>  float32x4_t a2 = vpaddq_f32 (accu, accu);</div>
<div class="line"><a name="l00488"></a><span class="lineno"> 488</span>  <span class="keywordflow">return</span> vdups_laneq_f32 (a2, 0) + vdups_laneq_f32 (a2, 1);</div>
<div class="line"><a name="l00489"></a><span class="lineno"> 489</span> }</div>
<div class="line"><a name="l00490"></a><span class="lineno"> 490</span> </div>
<div class="line"><a name="l00491"></a><span class="lineno"> 491</span> <span class="comment">// not optimized for ARM</span></div>
<div class="line"><a name="l00492"></a><span class="lineno"> 492</span> <span class="keywordtype">void</span> fvec_L2sqr_ny (<span class="keywordtype">float</span> * dis, <span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00493"></a><span class="lineno"> 493</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * y, <span class="keywordtype">size_t</span> d, <span class="keywordtype">size_t</span> ny) {</div>
<div class="line"><a name="l00494"></a><span class="lineno"> 494</span>  fvec_L2sqr_ny_ref (dis, x, y, d, ny);</div>
<div class="line"><a name="l00495"></a><span class="lineno"> 495</span> }</div>
<div class="line"><a name="l00496"></a><span class="lineno"> 496</span> </div>
<div class="line"><a name="l00497"></a><span class="lineno"> 497</span> </div>
<div class="line"><a name="l00498"></a><span class="lineno"> 498</span> <span class="preprocessor">#else</span></div>
<div class="line"><a name="l00499"></a><span class="lineno"> 499</span> <span class="preprocessor"></span><span class="comment">// scalar implementation</span></div>
<div class="line"><a name="l00500"></a><span class="lineno"> 500</span> </div>
<div class="line"><a name="l00501"></a><span class="lineno"><a class="line" href="namespacefaiss.html#a7466bd32de31640860393a701eaac5ad"> 501</a></span> <span class="keywordtype">float</span> <a class="code" href="namespacefaiss.html#a7466bd32de31640860393a701eaac5ad">fvec_L2sqr</a> (<span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00502"></a><span class="lineno"> 502</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * y,</div>
<div class="line"><a name="l00503"></a><span class="lineno"> 503</span>  <span class="keywordtype">size_t</span> d)</div>
<div class="line"><a name="l00504"></a><span class="lineno"> 504</span> {</div>
<div class="line"><a name="l00505"></a><span class="lineno"> 505</span>  <span class="keywordflow">return</span> fvec_L2sqr_ref (x, y, d);</div>
<div class="line"><a name="l00506"></a><span class="lineno"> 506</span> }</div>
<div class="line"><a name="l00507"></a><span class="lineno"> 507</span> </div>
<div class="line"><a name="l00508"></a><span class="lineno"> 508</span> <span class="keywordtype">float</span> fvec_inner_product (<span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00509"></a><span class="lineno"> 509</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * y,</div>
<div class="line"><a name="l00510"></a><span class="lineno"> 510</span>  <span class="keywordtype">size_t</span> d)</div>
<div class="line"><a name="l00511"></a><span class="lineno"> 511</span> {</div>
<div class="line"><a name="l00512"></a><span class="lineno"> 512</span>  <span class="keywordflow">return</span> fvec_inner_product_ref (x, y, d);</div>
<div class="line"><a name="l00513"></a><span class="lineno"> 513</span> }</div>
<div class="line"><a name="l00514"></a><span class="lineno"> 514</span> </div>
<div class="line"><a name="l00515"></a><span class="lineno"><a class="line" href="namespacefaiss.html#a7a49180ebf10e643217bbce5862c7f84"> 515</a></span> <span class="keywordtype">float</span> <a class="code" href="namespacefaiss.html#a7a49180ebf10e643217bbce5862c7f84">fvec_norm_L2sqr</a> (<span class="keyword">const</span> <span class="keywordtype">float</span> *x, <span class="keywordtype">size_t</span> d)</div>
<div class="line"><a name="l00516"></a><span class="lineno"> 516</span> {</div>
<div class="line"><a name="l00517"></a><span class="lineno"> 517</span>  <span class="keywordflow">return</span> fvec_norm_L2sqr_ref (x, d);</div>
<div class="line"><a name="l00518"></a><span class="lineno"> 518</span> }</div>
<div class="line"><a name="l00519"></a><span class="lineno"> 519</span> </div>
<div class="line"><a name="l00520"></a><span class="lineno"> 520</span> <span class="keywordtype">void</span> fvec_L2sqr_ny (<span class="keywordtype">float</span> * dis, <span class="keyword">const</span> <span class="keywordtype">float</span> * x,</div>
<div class="line"><a name="l00521"></a><span class="lineno"> 521</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> * y, <span class="keywordtype">size_t</span> d, <span class="keywordtype">size_t</span> ny) {</div>
<div class="line"><a name="l00522"></a><span class="lineno"> 522</span>  fvec_L2sqr_ny_ref (dis, x, y, d, ny);</div>
<div class="line"><a name="l00523"></a><span class="lineno"> 523</span> }</div>
<div class="line"><a name="l00524"></a><span class="lineno"> 524</span> </div>
<div class="line"><a name="l00525"></a><span class="lineno"> 525</span> </div>
<div class="line"><a name="l00526"></a><span class="lineno"> 526</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00527"></a><span class="lineno"> 527</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00528"></a><span class="lineno"> 528</span> </div>
<div class="line"><a name="l00529"></a><span class="lineno"> 529</span> </div>
<div class="line"><a name="l00530"></a><span class="lineno"> 530</span> </div>
<div class="line"><a name="l00531"></a><span class="lineno"> 531</span> </div>
<div class="line"><a name="l00532"></a><span class="lineno"> 532</span> </div>
<div class="line"><a name="l00533"></a><span class="lineno"> 533</span> </div>
<div class="line"><a name="l00534"></a><span class="lineno"> 534</span> </div>
<div class="line"><a name="l00535"></a><span class="lineno"> 535</span> </div>
<div class="line"><a name="l00536"></a><span class="lineno"> 536</span> </div>
<div class="line"><a name="l00537"></a><span class="lineno"> 537</span> </div>
<div class="line"><a name="l00538"></a><span class="lineno"> 538</span> </div>
<div class="line"><a name="l00539"></a><span class="lineno"> 539</span> </div>
<div class="line"><a name="l00540"></a><span class="lineno"> 540</span> </div>
<div class="line"><a name="l00541"></a><span class="lineno"> 541</span> </div>
<div class="line"><a name="l00542"></a><span class="lineno"> 542</span> </div>
<div class="line"><a name="l00543"></a><span class="lineno"> 543</span> </div>
<div class="line"><a name="l00544"></a><span class="lineno"> 544</span> </div>
<div class="line"><a name="l00545"></a><span class="lineno"> 545</span> </div>
<div class="line"><a name="l00546"></a><span class="lineno"> 546</span> </div>
<div class="line"><a name="l00547"></a><span class="lineno"> 547</span> <span class="comment">/***************************************************************************</span></div>
<div class="line"><a name="l00548"></a><span class="lineno"> 548</span> <span class="comment"> * heavily optimized table computations</span></div>
<div class="line"><a name="l00549"></a><span class="lineno"> 549</span> <span class="comment"> ***************************************************************************/</span></div>
<div class="line"><a name="l00550"></a><span class="lineno"> 550</span> </div>
<div class="line"><a name="l00551"></a><span class="lineno"> 551</span> </div>
<div class="line"><a name="l00552"></a><span class="lineno"> 552</span> <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> fvec_madd_ref (<span class="keywordtype">size_t</span> n, <span class="keyword">const</span> <span class="keywordtype">float</span> *a,</div>
<div class="line"><a name="l00553"></a><span class="lineno"> 553</span>  <span class="keywordtype">float</span> bf, <span class="keyword">const</span> <span class="keywordtype">float</span> *b, <span class="keywordtype">float</span> *c) {</div>
<div class="line"><a name="l00554"></a><span class="lineno"> 554</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < n; i++)</div>
<div class="line"><a name="l00555"></a><span class="lineno"> 555</span>  c[i] = a[i] + bf * b[i];</div>
<div class="line"><a name="l00556"></a><span class="lineno"> 556</span> }</div>
<div class="line"><a name="l00557"></a><span class="lineno"> 557</span> </div>
<div class="line"><a name="l00558"></a><span class="lineno"> 558</span> <span class="preprocessor">#ifdef __SSE__</span></div>
<div class="line"><a name="l00559"></a><span class="lineno"> 559</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00560"></a><span class="lineno"> 560</span> <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> fvec_madd_sse (<span class="keywordtype">size_t</span> n, <span class="keyword">const</span> <span class="keywordtype">float</span> *a,</div>
<div class="line"><a name="l00561"></a><span class="lineno"> 561</span>  <span class="keywordtype">float</span> bf, <span class="keyword">const</span> <span class="keywordtype">float</span> *b, <span class="keywordtype">float</span> *c) {</div>
<div class="line"><a name="l00562"></a><span class="lineno"> 562</span>  n >>= 2;</div>
<div class="line"><a name="l00563"></a><span class="lineno"> 563</span>  __m128 bf4 = _mm_set_ps1 (bf);</div>
<div class="line"><a name="l00564"></a><span class="lineno"> 564</span>  __m128 * a4 = (__m128*)a;</div>
<div class="line"><a name="l00565"></a><span class="lineno"> 565</span>  __m128 * b4 = (__m128*)b;</div>
<div class="line"><a name="l00566"></a><span class="lineno"> 566</span>  __m128 * c4 = (__m128*)c;</div>
<div class="line"><a name="l00567"></a><span class="lineno"> 567</span> </div>
<div class="line"><a name="l00568"></a><span class="lineno"> 568</span>  <span class="keywordflow">while</span> (n--) {</div>
<div class="line"><a name="l00569"></a><span class="lineno"> 569</span>  *c4 = _mm_add_ps (*a4, _mm_mul_ps (bf4, *b4));</div>
<div class="line"><a name="l00570"></a><span class="lineno"> 570</span>  b4++;</div>
<div class="line"><a name="l00571"></a><span class="lineno"> 571</span>  a4++;</div>
<div class="line"><a name="l00572"></a><span class="lineno"> 572</span>  c4++;</div>
<div class="line"><a name="l00573"></a><span class="lineno"> 573</span>  }</div>
<div class="line"><a name="l00574"></a><span class="lineno"> 574</span> }</div>
<div class="line"><a name="l00575"></a><span class="lineno"> 575</span> </div>
<div class="line"><a name="l00576"></a><span class="lineno"> 576</span> <span class="keywordtype">void</span> <a class="code" href="namespacefaiss.html#a40328c31abd0bbba5bd95d7de951e847">fvec_madd</a> (<span class="keywordtype">size_t</span> n, <span class="keyword">const</span> <span class="keywordtype">float</span> *a,</div>
<div class="line"><a name="l00577"></a><span class="lineno"> 577</span>  <span class="keywordtype">float</span> bf, <span class="keyword">const</span> <span class="keywordtype">float</span> *b, <span class="keywordtype">float</span> *c)</div>
<div class="line"><a name="l00578"></a><span class="lineno"> 578</span> {</div>
<div class="line"><a name="l00579"></a><span class="lineno"> 579</span>  <span class="keywordflow">if</span> ((n & 3) == 0 &&</div>
<div class="line"><a name="l00580"></a><span class="lineno"> 580</span>  ((((<span class="keywordtype">long</span>)a) | ((<span class="keywordtype">long</span>)b) | ((<span class="keywordtype">long</span>)c)) & 15) == 0)</div>
<div class="line"><a name="l00581"></a><span class="lineno"> 581</span>  fvec_madd_sse (n, a, bf, b, c);</div>
<div class="line"><a name="l00582"></a><span class="lineno"> 582</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00583"></a><span class="lineno"> 583</span>  fvec_madd_ref (n, a, bf, b, c);</div>
<div class="line"><a name="l00584"></a><span class="lineno"> 584</span> }</div>
<div class="line"><a name="l00585"></a><span class="lineno"> 585</span> </div>
<div class="line"><a name="l00586"></a><span class="lineno"> 586</span> <span class="preprocessor">#else</span></div>
<div class="line"><a name="l00587"></a><span class="lineno"> 587</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00588"></a><span class="lineno"><a class="line" href="namespacefaiss.html#a40328c31abd0bbba5bd95d7de951e847"> 588</a></span> <span class="keywordtype">void</span> <a class="code" href="namespacefaiss.html#a40328c31abd0bbba5bd95d7de951e847">fvec_madd</a> (<span class="keywordtype">size_t</span> n, <span class="keyword">const</span> <span class="keywordtype">float</span> *a,</div>
<div class="line"><a name="l00589"></a><span class="lineno"> 589</span>  <span class="keywordtype">float</span> bf, <span class="keyword">const</span> <span class="keywordtype">float</span> *b, <span class="keywordtype">float</span> *c)</div>
<div class="line"><a name="l00590"></a><span class="lineno"> 590</span> {</div>
<div class="line"><a name="l00591"></a><span class="lineno"> 591</span>  fvec_madd_ref (n, a, bf, b, c);</div>
<div class="line"><a name="l00592"></a><span class="lineno"> 592</span> }</div>
<div class="line"><a name="l00593"></a><span class="lineno"> 593</span> </div>
<div class="line"><a name="l00594"></a><span class="lineno"> 594</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00595"></a><span class="lineno"> 595</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00596"></a><span class="lineno"> 596</span> <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">int</span> fvec_madd_and_argmin_ref (<span class="keywordtype">size_t</span> n, <span class="keyword">const</span> <span class="keywordtype">float</span> *a,</div>
<div class="line"><a name="l00597"></a><span class="lineno"> 597</span>  <span class="keywordtype">float</span> bf, <span class="keyword">const</span> <span class="keywordtype">float</span> *b, <span class="keywordtype">float</span> *c) {</div>
<div class="line"><a name="l00598"></a><span class="lineno"> 598</span>  <span class="keywordtype">float</span> vmin = 1e20;</div>
<div class="line"><a name="l00599"></a><span class="lineno"> 599</span>  <span class="keywordtype">int</span> imin = -1;</div>
<div class="line"><a name="l00600"></a><span class="lineno"> 600</span> </div>
<div class="line"><a name="l00601"></a><span class="lineno"> 601</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < n; i++) {</div>
<div class="line"><a name="l00602"></a><span class="lineno"> 602</span>  c[i] = a[i] + bf * b[i];</div>
<div class="line"><a name="l00603"></a><span class="lineno"> 603</span>  <span class="keywordflow">if</span> (c[i] < vmin) {</div>
<div class="line"><a name="l00604"></a><span class="lineno"> 604</span>  vmin = c[i];</div>
<div class="line"><a name="l00605"></a><span class="lineno"> 605</span>  imin = i;</div>
<div class="line"><a name="l00606"></a><span class="lineno"> 606</span>  }</div>
<div class="line"><a name="l00607"></a><span class="lineno"> 607</span>  }</div>
<div class="line"><a name="l00608"></a><span class="lineno"> 608</span>  <span class="keywordflow">return</span> imin;</div>
<div class="line"><a name="l00609"></a><span class="lineno"> 609</span> }</div>
<div class="line"><a name="l00610"></a><span class="lineno"> 610</span> </div>
<div class="line"><a name="l00611"></a><span class="lineno"> 611</span> <span class="preprocessor">#ifdef __SSE__</span></div>
<div class="line"><a name="l00612"></a><span class="lineno"> 612</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00613"></a><span class="lineno"> 613</span> <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">int</span> fvec_madd_and_argmin_sse (</div>
<div class="line"><a name="l00614"></a><span class="lineno"> 614</span>  <span class="keywordtype">size_t</span> n, <span class="keyword">const</span> <span class="keywordtype">float</span> *a,</div>
<div class="line"><a name="l00615"></a><span class="lineno"> 615</span>  <span class="keywordtype">float</span> bf, <span class="keyword">const</span> <span class="keywordtype">float</span> *b, <span class="keywordtype">float</span> *c) {</div>
<div class="line"><a name="l00616"></a><span class="lineno"> 616</span>  n >>= 2;</div>
<div class="line"><a name="l00617"></a><span class="lineno"> 617</span>  __m128 bf4 = _mm_set_ps1 (bf);</div>
<div class="line"><a name="l00618"></a><span class="lineno"> 618</span>  __m128 vmin4 = _mm_set_ps1 (1e20);</div>
<div class="line"><a name="l00619"></a><span class="lineno"> 619</span>  __m128i imin4 = _mm_set1_epi32 (-1);</div>
<div class="line"><a name="l00620"></a><span class="lineno"> 620</span>  __m128i idx4 = _mm_set_epi32 (3, 2, 1, 0);</div>
<div class="line"><a name="l00621"></a><span class="lineno"> 621</span>  __m128i inc4 = _mm_set1_epi32 (4);</div>
<div class="line"><a name="l00622"></a><span class="lineno"> 622</span>  __m128 * a4 = (__m128*)a;</div>
<div class="line"><a name="l00623"></a><span class="lineno"> 623</span>  __m128 * b4 = (__m128*)b;</div>
<div class="line"><a name="l00624"></a><span class="lineno"> 624</span>  __m128 * c4 = (__m128*)c;</div>
<div class="line"><a name="l00625"></a><span class="lineno"> 625</span> </div>
<div class="line"><a name="l00626"></a><span class="lineno"> 626</span>  <span class="keywordflow">while</span> (n--) {</div>
<div class="line"><a name="l00627"></a><span class="lineno"> 627</span>  __m128 vc4 = _mm_add_ps (*a4, _mm_mul_ps (bf4, *b4));</div>
<div class="line"><a name="l00628"></a><span class="lineno"> 628</span>  *c4 = vc4;</div>
<div class="line"><a name="l00629"></a><span class="lineno"> 629</span>  __m128i mask = (__m128i)_mm_cmpgt_ps (vmin4, vc4);</div>
<div class="line"><a name="l00630"></a><span class="lineno"> 630</span>  <span class="comment">// imin4 = _mm_blendv_epi8 (imin4, idx4, mask); // slower!</span></div>
<div class="line"><a name="l00631"></a><span class="lineno"> 631</span> </div>
<div class="line"><a name="l00632"></a><span class="lineno"> 632</span>  imin4 = _mm_or_si128 (_mm_and_si128 (mask, idx4),</div>
<div class="line"><a name="l00633"></a><span class="lineno"> 633</span>  _mm_andnot_si128 (mask, imin4));</div>
<div class="line"><a name="l00634"></a><span class="lineno"> 634</span>  vmin4 = _mm_min_ps (vmin4, vc4);</div>
<div class="line"><a name="l00635"></a><span class="lineno"> 635</span>  b4++;</div>
<div class="line"><a name="l00636"></a><span class="lineno"> 636</span>  a4++;</div>
<div class="line"><a name="l00637"></a><span class="lineno"> 637</span>  c4++;</div>
<div class="line"><a name="l00638"></a><span class="lineno"> 638</span>  idx4 = _mm_add_epi32 (idx4, inc4);</div>
<div class="line"><a name="l00639"></a><span class="lineno"> 639</span>  }</div>
<div class="line"><a name="l00640"></a><span class="lineno"> 640</span> </div>
<div class="line"><a name="l00641"></a><span class="lineno"> 641</span>  <span class="comment">// 4 values -> 2</span></div>
<div class="line"><a name="l00642"></a><span class="lineno"> 642</span>  {</div>
<div class="line"><a name="l00643"></a><span class="lineno"> 643</span>  idx4 = _mm_shuffle_epi32 (imin4, 3 << 2 | 2);</div>
<div class="line"><a name="l00644"></a><span class="lineno"> 644</span>  __m128 vc4 = _mm_shuffle_ps (vmin4, vmin4, 3 << 2 | 2);</div>
<div class="line"><a name="l00645"></a><span class="lineno"> 645</span>  __m128i mask = (__m128i)_mm_cmpgt_ps (vmin4, vc4);</div>
<div class="line"><a name="l00646"></a><span class="lineno"> 646</span>  imin4 = _mm_or_si128 (_mm_and_si128 (mask, idx4),</div>
<div class="line"><a name="l00647"></a><span class="lineno"> 647</span>  _mm_andnot_si128 (mask, imin4));</div>
<div class="line"><a name="l00648"></a><span class="lineno"> 648</span>  vmin4 = _mm_min_ps (vmin4, vc4);</div>
<div class="line"><a name="l00649"></a><span class="lineno"> 649</span>  }</div>
<div class="line"><a name="l00650"></a><span class="lineno"> 650</span>  <span class="comment">// 2 values -> 1</span></div>
<div class="line"><a name="l00651"></a><span class="lineno"> 651</span>  {</div>
<div class="line"><a name="l00652"></a><span class="lineno"> 652</span>  idx4 = _mm_shuffle_epi32 (imin4, 1);</div>
<div class="line"><a name="l00653"></a><span class="lineno"> 653</span>  __m128 vc4 = _mm_shuffle_ps (vmin4, vmin4, 1);</div>
<div class="line"><a name="l00654"></a><span class="lineno"> 654</span>  __m128i mask = (__m128i)_mm_cmpgt_ps (vmin4, vc4);</div>
<div class="line"><a name="l00655"></a><span class="lineno"> 655</span>  imin4 = _mm_or_si128 (_mm_and_si128 (mask, idx4),</div>
<div class="line"><a name="l00656"></a><span class="lineno"> 656</span>  _mm_andnot_si128 (mask, imin4));</div>
<div class="line"><a name="l00657"></a><span class="lineno"> 657</span>  <span class="comment">// vmin4 = _mm_min_ps (vmin4, vc4);</span></div>
<div class="line"><a name="l00658"></a><span class="lineno"> 658</span>  }</div>
<div class="line"><a name="l00659"></a><span class="lineno"> 659</span>  <span class="keywordflow">return</span> _mm_cvtsi128_si32 (imin4);</div>
<div class="line"><a name="l00660"></a><span class="lineno"> 660</span> }</div>
<div class="line"><a name="l00661"></a><span class="lineno"> 661</span> </div>
<div class="line"><a name="l00662"></a><span class="lineno"> 662</span> </div>
<div class="line"><a name="l00663"></a><span class="lineno"> 663</span> <span class="keywordtype">int</span> <a class="code" href="namespacefaiss.html#a9da63b8bb84460f5e8ccf8e17622cc7a">fvec_madd_and_argmin</a> (<span class="keywordtype">size_t</span> n, <span class="keyword">const</span> <span class="keywordtype">float</span> *a,</div>
<div class="line"><a name="l00664"></a><span class="lineno"> 664</span>  <span class="keywordtype">float</span> bf, <span class="keyword">const</span> <span class="keywordtype">float</span> *b, <span class="keywordtype">float</span> *c)</div>
<div class="line"><a name="l00665"></a><span class="lineno"> 665</span> {</div>
<div class="line"><a name="l00666"></a><span class="lineno"> 666</span>  <span class="keywordflow">if</span> ((n & 3) == 0 &&</div>
<div class="line"><a name="l00667"></a><span class="lineno"> 667</span>  ((((<span class="keywordtype">long</span>)a) | ((<span class="keywordtype">long</span>)b) | ((<span class="keywordtype">long</span>)c)) & 15) == 0)</div>
<div class="line"><a name="l00668"></a><span class="lineno"> 668</span>  <span class="keywordflow">return</span> fvec_madd_and_argmin_sse (n, a, bf, b, c);</div>
<div class="line"><a name="l00669"></a><span class="lineno"> 669</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00670"></a><span class="lineno"> 670</span>  <span class="keywordflow">return</span> fvec_madd_and_argmin_ref (n, a, bf, b, c);</div>
<div class="line"><a name="l00671"></a><span class="lineno"> 671</span> }</div>
<div class="line"><a name="l00672"></a><span class="lineno"> 672</span> </div>
<div class="line"><a name="l00673"></a><span class="lineno"> 673</span> <span class="preprocessor">#else</span></div>
<div class="line"><a name="l00674"></a><span class="lineno"> 674</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00675"></a><span class="lineno"><a class="line" href="namespacefaiss.html#a9da63b8bb84460f5e8ccf8e17622cc7a"> 675</a></span> <span class="keywordtype">int</span> <a class="code" href="namespacefaiss.html#a9da63b8bb84460f5e8ccf8e17622cc7a">fvec_madd_and_argmin</a> (<span class="keywordtype">size_t</span> n, <span class="keyword">const</span> <span class="keywordtype">float</span> *a,</div>
<div class="line"><a name="l00676"></a><span class="lineno"> 676</span>  <span class="keywordtype">float</span> bf, <span class="keyword">const</span> <span class="keywordtype">float</span> *b, <span class="keywordtype">float</span> *c)</div>
<div class="line"><a name="l00677"></a><span class="lineno"> 677</span> {</div>
<div class="line"><a name="l00678"></a><span class="lineno"> 678</span>  <span class="keywordflow">return</span> fvec_madd_and_argmin_ref (n, a, bf, b, c);</div>
<div class="line"><a name="l00679"></a><span class="lineno"> 679</span> }</div>
<div class="line"><a name="l00680"></a><span class="lineno"> 680</span> </div>
<div class="line"><a name="l00681"></a><span class="lineno"> 681</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00682"></a><span class="lineno"> 682</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00683"></a><span class="lineno"> 683</span> </div>
<div class="line"><a name="l00684"></a><span class="lineno"> 684</span> </div>
<div class="line"><a name="l00685"></a><span class="lineno"> 685</span> </div>
<div class="line"><a name="l00686"></a><span class="lineno"> 686</span> } <span class="comment">// namespace faiss</span></div>
<div class="ttc" id="namespacefaiss_html_a7466bd32de31640860393a701eaac5ad"><div class="ttname"><a href="namespacefaiss.html#a7466bd32de31640860393a701eaac5ad">faiss::fvec_L2sqr</a></div><div class="ttdeci">float fvec_L2sqr(const float *x, const float *y, size_t d)</div><div class="ttdoc">Squared L2 distance between two vectors. </div><div class="ttdef"><b>Definition:</b> <a href="utils__simd_8cpp_source.html#l00501">utils_simd.cpp:501</a></div></div>
<div class="ttc" id="namespacefaiss_html_a40328c31abd0bbba5bd95d7de951e847"><div class="ttname"><a href="namespacefaiss.html#a40328c31abd0bbba5bd95d7de951e847">faiss::fvec_madd</a></div><div class="ttdeci">void fvec_madd(size_t n, const float *a, float bf, const float *b, float *c)</div><div class="ttdef"><b>Definition:</b> <a href="utils__simd_8cpp_source.html#l00588">utils_simd.cpp:588</a></div></div>
<div class="ttc" id="namespacefaiss_html_a7a49180ebf10e643217bbce5862c7f84"><div class="ttname"><a href="namespacefaiss.html#a7a49180ebf10e643217bbce5862c7f84">faiss::fvec_norm_L2sqr</a></div><div class="ttdeci">float fvec_norm_L2sqr(const float *x, size_t d)</div><div class="ttdef"><b>Definition:</b> <a href="utils__simd_8cpp_source.html#l00515">utils_simd.cpp:515</a></div></div>
<div class="ttc" id="namespacefaiss_html_a9da63b8bb84460f5e8ccf8e17622cc7a"><div class="ttname"><a href="namespacefaiss.html#a9da63b8bb84460f5e8ccf8e17622cc7a">faiss::fvec_madd_and_argmin</a></div><div class="ttdeci">int fvec_madd_and_argmin(size_t n, const float *a, float bf, const float *b, float *c)</div><div class="ttdef"><b>Definition:</b> <a href="utils__simd_8cpp_source.html#l00675">utils_simd.cpp:675</a></div></div>
</div><!-- fragment --></div><!-- contents -->
<!-- start footer part -->
<hr class="footer"/><address class="footer"><small>
Generated by  <a href="http://www.doxygen.org/index.html">
<img class="footer" src="doxygen.png" alt="doxygen"/>
</a> 1.8.5
</small></address>
</body>
</html>