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<li class="navelem"><a class="el" href="dir_6b3ae6988449b0834e9596fad5d75199.html">gpu</a></li><li class="navelem"><a class="el" href="dir_498271007b03b2a0521055e88776887b.html">utils</a></li> </ul>
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<div class="title">Float16.cu</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span>&#160;<span class="comment">/**</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span>&#160;<span class="comment"> * Copyright (c) 2015-present, Facebook, Inc.</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span>&#160;<span class="comment"> * All rights reserved.</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span>&#160;<span class="comment"> * This source code is licensed under the CC-by-NC license found in the</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span>&#160;<span class="comment"> * LICENSE file in the root directory of this source tree.</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;</div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160;<span class="comment">// Copyright 2004-present Facebook. All Rights Reserved.</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;</div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160;<span class="preprocessor">#include &quot;Float16.cuh&quot;</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160;<span class="preprocessor">#include &lt;thrust/execution_policy.h&gt;</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160;<span class="preprocessor">#include &lt;thrust/transform.h&gt;</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160;</div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160;<span class="preprocessor">#ifdef FAISS_USE_FLOAT16</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160;<span class="keyword">namespace </span>faiss { <span class="keyword">namespace </span>gpu {</div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160;</div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160;<span class="keywordtype">bool</span> getDeviceSupportsFloat16Math(<span class="keywordtype">int</span> device) {</div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160; <span class="keyword">const</span> <span class="keyword">auto</span>&amp; prop = getDeviceProperties(device);</div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160;</div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160; <span class="keywordflow">return</span> (prop.major &gt;= 6 ||</div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>&#160; (prop.major == 5 &amp;&amp; prop.minor &gt;= 3));</div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>&#160;}</div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>&#160;</div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>&#160;<span class="keyword">struct </span>FloatToHalf {</div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>&#160; __device__ half operator()(<span class="keywordtype">float</span> v)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> __float2half(v); }</div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>&#160;};</div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>&#160;</div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>&#160;<span class="keyword">struct </span>HalfToFloat {</div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>&#160; __device__ <span class="keywordtype">float</span> operator()(half v)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> __half2float(v); }</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>&#160;};</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>&#160;</div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>&#160;<span class="keywordtype">void</span> runConvertToFloat16(half* out,</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160; <span class="keyword">const</span> <span class="keywordtype">float</span>* in,</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>&#160; <span class="keywordtype">size_t</span> num,</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160; cudaStream_t stream) {</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>&#160; thrust::transform(thrust::cuda::par.on(stream),</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>&#160; in, in + num, out, FloatToHalf());</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>&#160;}</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>&#160;</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>&#160;<span class="keywordtype">void</span> runConvertToFloat32(<span class="keywordtype">float</span>* out,</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>&#160; <span class="keyword">const</span> half* in,</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>&#160; <span class="keywordtype">size_t</span> num,</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>&#160; cudaStream_t stream) {</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>&#160; thrust::transform(thrust::cuda::par.on(stream),</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160; in, in + num, out, HalfToFloat());</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160;}</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>&#160;</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160;<span class="comment">// FIXME: replace</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160;<span class="comment">/*</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160;<span class="comment"> Copyright (c) 2015, Norbert Juffa</span></div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>&#160;<span class="comment"> All rights reserved.</span></div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160;<span class="comment"> Redistribution and use in source and binary forms, with or without</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160;<span class="comment"> modification, are permitted provided that the following conditions</span></div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160;<span class="comment"> are met:</span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160;<span class="comment"> 1. Redistributions of source code must retain the above copyright</span></div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160;<span class="comment"> notice, this list of conditions and the following disclaimer.</span></div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160;<span class="comment"> 2. Redistributions in binary form must reproduce the above copyright</span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>&#160;<span class="comment"> notice, this list of conditions and the following disclaimer in the</span></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>&#160;<span class="comment"> documentation and/or other materials provided with the distribution.</span></div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160;<span class="comment"> THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS</span></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>&#160;<span class="comment"> &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT</span></div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>&#160;<span class="comment"> LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR</span></div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160;<span class="comment"> A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT</span></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160;<span class="comment"> HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160;<span class="comment"> SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT</span></div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160;<span class="comment"> LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,</span></div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160;<span class="comment"> DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY</span></div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160;<span class="comment"> THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT</span></div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160;<span class="comment"> (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE</span></div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160;<span class="comment"> OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span></div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160;<span class="comment">*/</span></div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>&#160;</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>&#160;half hostFloat2Half(<span class="keywordtype">float</span> a) {</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>&#160; uint32_t ia;</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160; uint16_t ir;</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>&#160; memcpy(&amp;ia, &amp;a, <span class="keyword">sizeof</span>(<span class="keywordtype">float</span>));</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>&#160;</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>&#160; ir = (ia &gt;&gt; 16) &amp; 0x8000;</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>&#160; <span class="keywordflow">if</span> ((ia &amp; 0x7f800000) == 0x7f800000) {</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>&#160; <span class="keywordflow">if</span> ((ia &amp; 0x7fffffff) == 0x7f800000) {</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>&#160; ir |= 0x7c00; <span class="comment">/* infinity */</span></div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>&#160; } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>&#160; ir = 0x7fff; <span class="comment">/* canonical NaN */</span></div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>&#160; }</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>&#160; } <span class="keywordflow">else</span> <span class="keywordflow">if</span> ((ia &amp; 0x7f800000) &gt;= 0x33000000) {</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>&#160; <span class="keywordtype">int</span> shift = (int)((ia &gt;&gt; 23) &amp; 0xff) - 127;</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>&#160; <span class="keywordflow">if</span> (shift &gt; 15) {</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>&#160; ir |= 0x7c00; <span class="comment">/* infinity */</span></div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>&#160; } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>&#160; ia = (ia &amp; 0x007fffff) | 0x00800000; <span class="comment">/* extract mantissa */</span></div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>&#160; <span class="keywordflow">if</span> (shift &lt; -14) { <span class="comment">/* denormal */</span></div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>&#160; ir |= ia &gt;&gt; (-1 - shift);</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>&#160; ia = ia &lt;&lt; (32 - (-1 - shift));</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>&#160; } <span class="keywordflow">else</span> { <span class="comment">/* normal */</span></div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>&#160; ir |= ia &gt;&gt; (24 - 11);</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>&#160; ia = ia &lt;&lt; (32 - (24 - 11));</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>&#160; ir = ir + ((14 + shift) &lt;&lt; 10);</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>&#160; }</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>&#160; <span class="comment">/* IEEE-754 round to nearest of even */</span></div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>&#160; <span class="keywordflow">if</span> ((ia &gt; 0x80000000) || ((ia == 0x80000000) &amp;&amp; (ir &amp; 1))) {</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>&#160; ir++;</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>&#160; }</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>&#160; }</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>&#160; }</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>&#160;</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>&#160; half ret;</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>&#160; memcpy(&amp;ret, &amp;ir, <span class="keyword">sizeof</span>(half));</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>&#160; <span class="keywordflow">return</span> ret;</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>&#160;}</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>&#160;</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>&#160;} } <span class="comment">// namespace</span></div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>&#160;</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>&#160;<span class="preprocessor">#endif // FAISS_USE_FLOAT16</span></div>
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