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<a href="a00059.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// File: simddetect.cpp</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// Description: Architecture detector.</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">// Author: Stefan Weil (based on code from Ray Smith)</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">//</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">// (C) Copyright 2014, Google Inc.</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">// Licensed under the Apache License, Version 2.0 (the "License");</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">// you may not use this file except in compliance with the License.</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">// You may obtain a copy of the License at</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment">// http://www.apache.org/licenses/LICENSE-2.0</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment">// Unless required by applicable law or agreed to in writing, software</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment">// distributed under the License is distributed on an "AS IS" BASIS,</span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment">// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment">// See the License for the specific language governing permissions and</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment">// limitations under the License.</span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"></span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="preprocessor">#include "<a class="code" href="a00062.html">simddetect.h</a>"</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="preprocessor">#undef X86_BUILD</span></div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="preprocessor">#if defined(__x86_64__) || defined(__i386__) || defined(_WIN32)</span></div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="preprocessor">#if !defined(ANDROID_BUILD)</span></div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor">#define X86_BUILD 1</span></div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor">#endif // !ANDROID_BUILD</span></div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor">#endif // x86 target</span></div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> </div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="preprocessor">#if defined(X86_BUILD)</span></div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="preprocessor">#if defined(__GNUC__)</span></div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="preprocessor">#include <cpuid.h></span></div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor">#elif defined(_WIN32)</span></div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="preprocessor">#include <intrin.h></span></div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="preprocessor">#endif</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> <a class="code" href="a02238.html">SIMDDetect</a> SIMDDetect::detector;</div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> </div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment">// If true, then AVX has been detected.</span></div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="keywordtype">bool</span> SIMDDetect::avx_available_;</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="keywordtype">bool</span> SIMDDetect::avx2_available_;</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="keywordtype">bool</span> SIMDDetect::avx512F_available_;</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="keywordtype">bool</span> SIMDDetect::avx512BW_available_;</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment">// If true, then SSe4.1 has been detected.</span></div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="keywordtype">bool</span> SIMDDetect::sse_available_;</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">// Constructor.</span></div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="comment">// Tests the architecture in a system-dependent way to detect AVX, SSE and</span></div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="comment">// any other available SIMD equipment.</span></div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="comment">// __GNUC__ is also defined by compilers that include GNU extensions such as</span></div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment">// clang.</span></div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> SIMDDetect::SIMDDetect() {</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="preprocessor">#if defined(X86_BUILD)</span></div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="preprocessor">#if defined(__GNUC__)</span></div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> eax, ebx, ecx, edx;</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="keywordflow">if</span> (__get_cpuid(1, &eax, &ebx, &ecx, &edx) != 0) {</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="comment">// Note that these tests all use hex because the older compilers don't have</span></div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="comment">// the newer flags.</span></div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  sse_available_ = (ecx & 0x00080000) != 0;</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  avx_available_ = (ecx & 0x10000000) != 0;</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="keywordflow">if</span> (avx_available_) {</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="comment">// There is supposed to be a __get_cpuid_count function, but this is all</span></div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="comment">// there is in my cpuid.h. It is a macro for an asm statement and cannot</span></div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="comment">// be used inside an if.</span></div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  __cpuid_count(7, 0, eax, ebx, ecx, edx);</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  avx2_available_ = (ebx & 0x00000020) != 0;</div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  avx512F_available_ = (ebx & 0x00010000) != 0;</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  avx512BW_available_ = (ebx & 0x40000000) != 0;</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  }</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  }</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="preprocessor">#elif defined(_WIN32)</span></div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="keywordtype">int</span> cpuInfo[4];</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  __cpuid(cpuInfo, 0);</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="keywordflow">if</span> (cpuInfo[0] >= 1) {</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  __cpuid(cpuInfo, 1);</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  sse_available_ = (cpuInfo[2] & 0x00080000) != 0;</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  avx_available_ = (cpuInfo[2] & 0x10000000) != 0;</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  }</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="preprocessor">#else</span></div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="preprocessor">#error "I don't know how to test for SIMD with this compiler"</span></div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="preprocessor">#endif // X86_BUILD</span></div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span> }</div><div class="ttc" id="a00062_html"><div class="ttname"><a href="a00062.html">simddetect.h</a></div></div>
<div class="ttc" id="a02238_html"><div class="ttname"><a href="a02238.html">SIMDDetect</a></div><div class="ttdef"><b>Definition:</b> <a href="a00062_source.html#l00025">simddetect.h:25</a></div></div>
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