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<div class="title">opt_random.h</div> </div>
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<a href="a01396.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">// Optimizations for random number functions, x86 version -*- C++ -*-</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> </div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// Copyright (C) 2012-2013 Free Software Foundation, Inc.</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">//</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">// This file is part of the GNU ISO C++ Library. This library is free</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">// software; you can redistribute it and/or modify it under the</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">// terms of the GNU General Public License as published by the</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">// Free Software Foundation; either version 3, or (at your option)</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">// any later version.</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> </div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment">// This library is distributed in the hope that it will be useful,</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment">// but WITHOUT ANY WARRANTY; without even the implied warranty of</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment">// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment">// GNU General Public License for more details.</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> </div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment">// Under Section 7 of GPL version 3, you are granted additional</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment">// permissions described in the GCC Runtime Library Exception, version</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment">// 3.1, as published by the Free Software Foundation.</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> </div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment">// You should have received a copy of the GNU General Public License and</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment">// a copy of the GCC Runtime Library Exception along with this program;</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment">// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment">// <http://www.gnu.org/licenses/>.</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment"></span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment">/** @file bits/opt_random.h</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> * This is an internal header file, included by other library headers.</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> * Do not attempt to use it directly. @headername{random}</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> </div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor">#ifndef _BITS_OPT_RANDOM_H</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="preprocessor"></span><span class="preprocessor">#define _BITS_OPT_RANDOM_H 1</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="preprocessor">#include <x86intrin.h></span></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> </div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="preprocessor">#pragma GCC system_header</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> </div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="keyword">namespace </span>std _GLIBCXX_VISIBILITY(default)</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> {</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> _GLIBCXX_BEGIN_NAMESPACE_VERSION</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> </div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="preprocessor">#ifdef __SSE3__</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="preprocessor"></span> <span class="keyword">template</span><></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _UniformRandomNumberGenerator></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="keywordtype">void</span></div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  normal_distribution<double>::</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  __generate(<span class="keyword">typename</span> <a class="code" href="a00469.html#ae45488abda3f5b20d944da2da5a70001">normal_distribution<double>::result_type</a>* __f,</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="keyword">typename</span> <a class="code" href="a00469.html#ae45488abda3f5b20d944da2da5a70001">normal_distribution<double>::result_type</a>* __t,</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  _UniformRandomNumberGenerator& __urng,</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="keyword">const</span> param_type& __param)</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  {</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keyword">typedef</span> uint64_t __uctype;</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> </div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="keywordflow">if</span> (__f == __t)</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> </div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keywordflow">if</span> (_M_saved_available)</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>  _M_saved_available = <span class="keyword">false</span>;</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  *__f++ = _M_saved * __param.stddev() + __param.mean();</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> </div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keywordflow">if</span> (__f == __t)</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  }</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>  constexpr uint64_t __maskval = 0xfffffffffffffull;</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keyword">static</span> <span class="keyword">const</span> __m128i __mask = _mm_set1_epi64x(__maskval);</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keyword">static</span> <span class="keyword">const</span> __m128i __two = _mm_set1_epi64x(0x4000000000000000ull);</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="keyword">static</span> <span class="keyword">const</span> __m128d __three = _mm_set1_pd(3.0);</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="keyword">const</span> __m128d __av = _mm_set1_pd(__param.mean());</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> </div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keyword">const</span> __uctype __urngmin = __urng.min();</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keyword">const</span> __uctype __urngmax = __urng.max();</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="keyword">const</span> __uctype __urngrange = __urngmax - __urngmin;</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="keyword">const</span> __uctype __uerngrange = __urngrange + 1;</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">while</span> (__f + 1 < __t)</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>  <span class="keywordtype">double</span> __le;</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  __m128d __x;</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="keywordflow">do</span></div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  {</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="keyword">union</span></div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  {</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  __m128i __i;</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  __m128d __d;</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  } __v;</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="keywordflow">if</span> (__urngrange > __maskval)</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="keywordflow">if</span> (__detail::_Power_of_2(__uerngrange))</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  __v.__i = _mm_and_si128(_mm_set_epi64x(__urng(),</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  __urng()),</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  __mask);</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="keywordflow">else</span></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>  <span class="keyword">const</span> __uctype __uerange = __maskval + 1;</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="keyword">const</span> __uctype __scaling = __urngrange / __uerange;</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="keyword">const</span> __uctype __past = __uerange * __scaling;</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  uint64_t __v1;</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keywordflow">do</span></div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  __v1 = __uctype(__urng()) - __urngmin;</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="keywordflow">while</span> (__v1 >= __past);</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  __v1 /= __scaling;</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  uint64_t __v2;</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <span class="keywordflow">do</span></div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  __v2 = __uctype(__urng()) - __urngmin;</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="keywordflow">while</span> (__v2 >= __past);</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  __v2 /= __scaling;</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>  __v.__i = _mm_set_epi64x(__v1, __v2);</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>  }</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (__urngrange == __maskval)</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  __v.__i = _mm_set_epi64x(__urng(), __urng());</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> ((__urngrange + 2) * __urngrange >= __maskval</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  && __detail::_Power_of_2(__uerngrange))</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  {</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  uint64_t __v1 = __urng() * __uerngrange + __urng();</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  uint64_t __v2 = __urng() * __uerngrange + __urng();</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>  __v.__i = _mm_and_si128(_mm_set_epi64x(__v1, __v2),</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  __mask);</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  }</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  {</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  <span class="keywordtype">size_t</span> __nrng = 2;</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  __uctype __high = __maskval / __uerngrange / __uerngrange;</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  <span class="keywordflow">while</span> (__high > __uerngrange)</div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  {</div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  ++__nrng;</div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  __high /= __uerngrange;</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  }</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  <span class="keyword">const</span> __uctype __highrange = __high + 1;</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  <span class="keyword">const</span> __uctype __scaling = __urngrange / __highrange;</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  <span class="keyword">const</span> __uctype __past = __highrange * __scaling;</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  __uctype __tmp;</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>  uint64_t __v1;</div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  <span class="keywordflow">do</span></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">do</span></div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  __tmp = __uctype(__urng()) - __urngmin;</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  <span class="keywordflow">while</span> (__tmp >= __past);</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  __v1 = __tmp / __scaling;</div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> __cnt = 0; __cnt < __nrng; ++__cnt)</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>  __tmp = __v1;</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  __v1 *= __uerngrange;</div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  __v1 += __uctype(__urng()) - __urngmin;</div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  }</div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  }</div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  <span class="keywordflow">while</span> (__v1 > __maskval || __v1 < __tmp);</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>  uint64_t __v2;</div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  <span class="keywordflow">do</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="keywordflow">do</span></div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  __tmp = __uctype(__urng()) - __urngmin;</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  <span class="keywordflow">while</span> (__tmp >= __past);</div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  __v2 = __tmp / __scaling;</div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> __cnt = 0; __cnt < __nrng; ++__cnt)</div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  {</div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  __tmp = __v2;</div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  __v2 *= __uerngrange;</div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  __v2 += __uctype(__urng()) - __urngmin;</div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  }</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="keywordflow">while</span> (__v2 > __maskval || __v2 < __tmp);</div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  </div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  __v.__i = _mm_set_epi64x(__v1, __v2);</div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  }</div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span> </div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  __v.__i = _mm_or_si128(__v.__i, __two);</div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  __x = _mm_sub_pd(__v.__d, __three);</div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  __m128d __m = _mm_mul_pd(__x, __x);</div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  __le = _mm_cvtsd_f64(_mm_hadd_pd (__m, __m));</div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  }</div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  <span class="keywordflow">while</span> (__le == 0.0 || __le >= 1.0);</div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span> </div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  <span class="keywordtype">double</span> __mult = (<a class="code" href="a01690.html#gaf91cd3409ab242d469bcc1b2d06624c3">std::sqrt</a>(-2.0 * <a class="code" href="a01690.html#ga42f2de63a5c18a149f94b926d4d6bb21">std::log</a>(__le) / __le)</div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  * __param.stddev());</div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span> </div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  __x = _mm_add_pd(_mm_mul_pd(__x, _mm_set1_pd(__mult)), __av);</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>  _mm_storeu_pd(__f, __x);</div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  __f += 2;</div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  }</div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span> </div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  <span class="keywordflow">if</span> (__f != __t)</div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  {</div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  result_type __x, __y, __r2;</div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span> </div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  __detail::_Adaptor<_UniformRandomNumberGenerator, result_type></div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  __aurng(__urng);</div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span> </div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  <span class="keywordflow">do</span></div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  {</div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  __x = result_type(2.0) * __aurng() - 1.0;</div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  __y = result_type(2.0) * __aurng() - 1.0;</div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  __r2 = __x * __x + __y * __y;</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">while</span> (__r2 > 1.0 || __r2 == 0.0);</div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span> </div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  <span class="keyword">const</span> result_type __mult = <a class="code" href="a01690.html#gaf91cd3409ab242d469bcc1b2d06624c3">std::sqrt</a>(-2 * <a class="code" href="a01690.html#ga42f2de63a5c18a149f94b926d4d6bb21">std::log</a>(__r2) / __r2);</div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  _M_saved = __x * __mult;</div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  _M_saved_available = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  *__f = __y * __mult * __param.stddev() + __param.mean();</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>  }</div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span> </div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span> _GLIBCXX_END_NAMESPACE_VERSION</div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span> } <span class="comment">// namespace</span></div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span> </div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span> </div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span> <span class="preprocessor">#endif // _BITS_OPT_RANDOM_H</span></div>
<div class="ttc" id="a01690_html_ga42f2de63a5c18a149f94b926d4d6bb21"><div class="ttname"><a href="a01690.html#ga42f2de63a5c18a149f94b926d4d6bb21">std::log</a></div><div class="ttdeci">complex< _Tp > log(const complex< _Tp > &)</div><div class="ttdoc">Return complex natural logarithm of z. </div><div class="ttdef"><b>Definition:</b> <a href="a01104_source.html#l00787">complex:787</a></div></div>
<div class="ttc" id="a01690_html_gaf91cd3409ab242d469bcc1b2d06624c3"><div class="ttname"><a href="a01690.html#gaf91cd3409ab242d469bcc1b2d06624c3">std::sqrt</a></div><div class="ttdeci">complex< _Tp > sqrt(const complex< _Tp > &)</div><div class="ttdoc">Return complex square root of z. </div><div class="ttdef"><b>Definition:</b> <a href="a01104_source.html#l00896">complex:896</a></div></div>
<div class="ttc" id="a00469_html_ae45488abda3f5b20d944da2da5a70001"><div class="ttname"><a href="a00469.html#ae45488abda3f5b20d944da2da5a70001">std::normal_distribution< double >::result_type</a></div><div class="ttdeci">double result_type</div><div class="ttdef"><b>Definition:</b> <a href="a01452_source.html#l02088">random.h:2088</a></div></div>
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