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<div class="title">StaticUtils.h</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/**</span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> * Copyright (c) Facebook, Inc. and its affiliates.</span></div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> *</span></div>
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<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>
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<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>
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<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> */</span></div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> </div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> </div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#pragma once</span></div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor"></span></div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#include <cuda.h></span></div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> </div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="keyword">namespace </span>faiss { <span class="keyword">namespace </span>gpu { <span class="keyword">namespace </span>utils {</div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> </div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="keyword">template</span> <<span class="keyword">typename</span> U, <span class="keyword">typename</span> V></div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> constexpr __host__ __device__ <span class="keyword">auto</span> divUp(U a, V b) -> decltype(a + b) {</div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>  <span class="keywordflow">return</span> (a + b - 1) / b;</div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> }</div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> </div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="keyword">template</span> <<span class="keyword">typename</span> U, <span class="keyword">typename</span> V></div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> constexpr __host__ __device__ <span class="keyword">auto</span> roundDown(U a, V b) -> decltype(a + b) {</div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  <span class="keywordflow">return</span> (a / b) * b;</div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> }</div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> </div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="keyword">template</span> <<span class="keyword">typename</span> U, <span class="keyword">typename</span> V></div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> constexpr __host__ __device__ <span class="keyword">auto</span> roundUp(U a, V b) -> decltype(a + b) {</div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  <span class="keywordflow">return</span> divUp(a, b) * b;</div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> }</div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> </div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="keyword">template</span> <<span class="keyword">class</span> T></div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> constexpr __host__ __device__ T pow(T n, T power) {</div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  <span class="keywordflow">return</span> (power > 0 ? n * pow(n, power - 1) : 1);</div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> }</div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> </div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="keyword">template</span> <<span class="keyword">class</span> T></div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> constexpr __host__ __device__ T pow2(T n) {</div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <span class="keywordflow">return</span> pow(2, (T) n);</div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> }</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> </div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> static_assert(pow2(8) == 256, <span class="stringliteral">"pow2"</span>);</div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> </div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="keyword">template</span> <<span class="keyword">typename</span> T></div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> constexpr __host__ __device__ <span class="keywordtype">int</span> log2(T n, <span class="keywordtype">int</span> p = 0) {</div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="keywordflow">return</span> (n <= 1) ? p : log2(n / 2, p + 1);</div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> }</div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> </div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> static_assert(log2(2) == 1, <span class="stringliteral">"log2"</span>);</div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> static_assert(log2(3) == 1, <span class="stringliteral">"log2"</span>);</div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> static_assert(log2(4) == 2, <span class="stringliteral">"log2"</span>);</div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> </div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="keyword">template</span> <<span class="keyword">typename</span> T></div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> constexpr __host__ __device__ <span class="keywordtype">bool</span> isPowerOf2(T v) {</div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keywordflow">return</span> (v && !(v & (v - 1)));</div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> }</div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> </div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> static_assert(isPowerOf2(2048), <span class="stringliteral">"isPowerOf2"</span>);</div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> static_assert(!isPowerOf2(3333), <span class="stringliteral">"isPowerOf2"</span>);</div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> </div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="keyword">template</span> <<span class="keyword">typename</span> T></div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> constexpr __host__ __device__ T nextHighestPowerOf2(T v) {</div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keywordflow">return</span> (isPowerOf2(v) ? (T) 2 * v : ((T) 1 << (log2(v) + 1)));</div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> }</div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> </div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> static_assert(nextHighestPowerOf2(1) == 2, <span class="stringliteral">"nextHighestPowerOf2"</span>);</div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> static_assert(nextHighestPowerOf2(2) == 4, <span class="stringliteral">"nextHighestPowerOf2"</span>);</div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> static_assert(nextHighestPowerOf2(3) == 4, <span class="stringliteral">"nextHighestPowerOf2"</span>);</div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> static_assert(nextHighestPowerOf2(4) == 8, <span class="stringliteral">"nextHighestPowerOf2"</span>);</div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> </div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> static_assert(nextHighestPowerOf2(15) == 16, <span class="stringliteral">"nextHighestPowerOf2"</span>);</div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> static_assert(nextHighestPowerOf2(16) == 32, <span class="stringliteral">"nextHighestPowerOf2"</span>);</div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> static_assert(nextHighestPowerOf2(17) == 32, <span class="stringliteral">"nextHighestPowerOf2"</span>);</div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> </div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> static_assert(nextHighestPowerOf2(1536000000u) == 2147483648u,</div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="stringliteral">"nextHighestPowerOf2"</span>);</div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> static_assert(nextHighestPowerOf2((<span class="keywordtype">size_t</span>) 2147483648ULL) ==</div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  (<span class="keywordtype">size_t</span>) 4294967296ULL, <span class="stringliteral">"nextHighestPowerOf2"</span>);</div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> </div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span> } } } <span class="comment">// namespace</span></div>
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