<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://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 1.8.15"/> <meta name="viewport" content="width=device-width, initial-scale=1"/> <title>Crypto++: crc-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="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 id="projectalign" style="padding-left: 0.5em;"> <div id="projectname">Crypto++  <span id="projectnumber">7.0</span> </div> <div id="projectbrief">Free C++ class library of cryptographic schemes</div> </td> </tr> </tbody> </table> </div> <!-- end header part --> <!-- Generated by Doxygen 1.8.15 --> <script type="text/javascript" src="menudata.js"></script> <script type="text/javascript" src="menu.js"></script> <script type="text/javascript"> /* @license magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&dn=gpl-2.0.txt GPL-v2 */ $(function() { initMenu('',false,false,'search.php','Search'); }); /* @license-end */</script> <div id="main-nav"></div> </div><!-- top --> <div class="header"> <div class="headertitle"> <div class="title">crc-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">// crc-simd.cpp - written and placed in the public domain by</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">// Jeffrey Walton, Uri Blumenthal and Marcel Raad.</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 file uses intrinsics to gain access to SSE4.2 and</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">// ARMv8a CRC-32 and CRC-32C instructions. A separate source file</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">// is needed because additional CXXFLAGS are required to enable</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">// the appropriate instructions sets in some build configurations.</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> </div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#include "<a class="code" href="pch_8h.html">pch.h</a>"</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor">#include "<a class="code" href="config_8h.html">config.h</a>"</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#include "<a class="code" href="misc_8h.html">misc.h</a>"</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> </div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#if (CRYPTOPP_SSE42_AVAILABLE)</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor"># include <nmmintrin.h></span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="preprocessor">#endif</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="comment">// Use ARMv8 rather than NEON due to compiler inconsistencies</span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="preprocessor">#if (CRYPTOPP_ARM_CRC32_AVAILABLE)</span></div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="preprocessor"># include <arm_neon.h></span></div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> </div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment">// Can't use CRYPTOPP_ARM_XXX_AVAILABLE because too many</span></div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment">// compilers don't follow ACLE conventions for the include.</span></div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor">#if defined(CRYPTOPP_ARM_ACLE_AVAILABLE)</span></div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor"># include <stdint.h></span></div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="preprocessor"># include <arm_acle.h></span></div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="preprocessor">#endif</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="preprocessor">#ifdef CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY</span></div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor"># include <signal.h></span></div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="preprocessor"># include <setjmp.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> </div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="preprocessor">#ifndef EXCEPTION_EXECUTE_HANDLER</span></div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="preprocessor"># define EXCEPTION_EXECUTE_HANDLER 1</span></div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> </div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span> NAMESPACE_BEGIN(<a class="code" href="namespace_crypto_p_p.html">CryptoPP</a>)</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="preprocessor">#ifdef CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY</span></div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="keyword">extern</span> <span class="stringliteral">"C"</span> {</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="keyword">typedef</span> void (*SigHandler)(int);</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>  <span class="keyword">static</span> jmp_buf s_jmpSIGILL;</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="keyword">static</span> <span class="keywordtype">void</span> SigIllHandler(<span class="keywordtype">int</span>)</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  {</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  longjmp(s_jmpSIGILL, 1);</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  }</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> }</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="preprocessor">#endif // Not CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY</span></div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> </div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="preprocessor">#if (CRYPTOPP_BOOL_ARM32 || CRYPTOPP_BOOL_ARM64)</span></div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span> </div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="keywordtype">bool</span> CPU_ProbeCRC32()</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span> {</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="preprocessor">#if defined(CRYPTOPP_NO_CPU_FEATURE_PROBES)</span></div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="preprocessor">#elif (CRYPTOPP_ARM_CRC32_AVAILABLE)</span></div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="preprocessor"># if defined(CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY)</span></div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="keyword">volatile</span> <span class="keywordtype">bool</span> result = <span class="keyword">true</span>;</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  __try</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>  word32 w=0, x=1; word16 y=2; <span class="keywordtype">byte</span> z=3;</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  w = __crc32w(w,x);</div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  w = __crc32h(w,y);</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  w = __crc32b(w,z);</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  w = __crc32cw(w,x);</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  w = __crc32ch(w,y);</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  w = __crc32cb(w,z);</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span> </div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  result = !!w;</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>  __except (EXCEPTION_EXECUTE_HANDLER)</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  {</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</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="keywordflow">return</span> result;</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="preprocessor">#else</span></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="comment">// longjmp and clobber warnings. Volatile is required.</span></div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="comment">// http://github.com/weidai11/cryptopp/issues/24 and http://stackoverflow.com/q/7721854</span></div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="keyword">volatile</span> <span class="keywordtype">bool</span> result = <span class="keyword">true</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">volatile</span> SigHandler oldHandler = signal(SIGILL, SigIllHandler);</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="keywordflow">if</span> (oldHandler == SIG_ERR)</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span> </div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keyword">volatile</span> sigset_t oldMask;</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keywordflow">if</span> (sigprocmask(0, NULLPTR, (sigset_t*)&oldMask))</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</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> (setjmp(s_jmpSIGILL))</div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  result = <span class="keyword">false</span>;</div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  {</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  word32 w=0, x=1; word16 y=2; <span class="keywordtype">byte</span> z=3;</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  w = __crc32w(w,x);</div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  w = __crc32h(w,y);</div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  w = __crc32b(w,z);</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  w = __crc32cw(w,x);</div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  w = __crc32ch(w,y);</div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  w = __crc32cb(w,z);</div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span> </div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="comment">// Hack... GCC optimizes away the code and returns true</span></div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  result = !!w;</div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  }</div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span> </div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  sigprocmask(SIG_SETMASK, (sigset_t*)&oldMask, NULLPTR);</div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  signal(SIGILL, oldHandler);</div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="keywordflow">return</span> result;</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span> <span class="preprocessor"># endif</span></div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span> <span class="preprocessor">#else</span></div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span> <span class="preprocessor">#endif // CRYPTOPP_ARM_CRC32_AVAILABLE</span></div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span> }</div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span> <span class="preprocessor">#endif // ARM32 or ARM64</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">#if (CRYPTOPP_ARM_CRC32_AVAILABLE)</span></div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span> <span class="keywordtype">void</span> CRC32_Update_ARMV8(<span class="keyword">const</span> <span class="keywordtype">byte</span> *s, <span class="keywordtype">size_t</span> n, word32& c)</div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span> {</div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="keywordflow">for</span>(; !IsAligned<word32>(s) && n > 0; s++, n--)</div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  c = __crc32b(c, *s);</div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span> </div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <span class="keywordflow">for</span>(; n > 4; s+=4, n-=4)</div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  c = __crc32w(c, *(<span class="keyword">const</span> word32 *)(<span class="keywordtype">void</span>*)s);</div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span> </div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <span class="keywordflow">for</span>(; n > 0; s++, n--)</div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  c = __crc32b(c, *s);</div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span> }</div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span> </div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span> <span class="keywordtype">void</span> CRC32C_Update_ARMV8(<span class="keyword">const</span> <span class="keywordtype">byte</span> *s, <span class="keywordtype">size_t</span> n, word32& c)</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">for</span>(; !IsAligned<word32>(s) && n > 0; s++, n--)</div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  c = __crc32cb(c, *s);</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>  <span class="keywordflow">for</span>(; n > 4; s+=4, n-=4)</div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  c = __crc32cw(c, *(<span class="keyword">const</span> word32 *)(<span class="keywordtype">void</span>*)s);</div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span> </div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  <span class="keywordflow">for</span>(; n > 0; s++, n--)</div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  c = __crc32cb(c, *s);</div><div class="line"><a name="l00141"></a><span class="lineno"> 141</span> }</div><div class="line"><a name="l00142"></a><span class="lineno"> 142</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span> </div><div class="line"><a name="l00144"></a><span class="lineno"> 144</span> <span class="preprocessor">#if (CRYPTOPP_SSE42_AVAILABLE)</span></div><div class="line"><a name="l00145"></a><span class="lineno"> 145</span> <span class="keywordtype">void</span> CRC32C_Update_SSE42(<span class="keyword">const</span> <span class="keywordtype">byte</span> *s, <span class="keywordtype">size_t</span> n, word32& c)</div><div class="line"><a name="l00146"></a><span class="lineno"> 146</span> {</div><div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  <span class="keywordflow">for</span>(; !IsAligned<word32>(s) && n > 0; s++, n--)</div><div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  c = _mm_crc32_u8(c, *s);</div><div class="line"><a name="l00149"></a><span class="lineno"> 149</span> </div><div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  <span class="keywordflow">for</span>(; n > 4; s+=4, n-=4)</div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  c = _mm_crc32_u32(c, *(<span class="keyword">const</span> word32 *)(<span class="keywordtype">void</span>*)s);</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>  <span class="keywordflow">for</span>(; n > 0; s++, n--)</div><div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  c = _mm_crc32_u8(c, *s);</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> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00157"></a><span class="lineno"> 157</span> </div><div class="line"><a name="l00158"></a><span class="lineno"> 158</span> NAMESPACE_END</div><div class="ttc" id="misc_8h_html"><div class="ttname"><a href="misc_8h.html">misc.h</a></div><div class="ttdoc">Utility functions for the Crypto++ library.</div></div> <div class="ttc" id="config_8h_html"><div class="ttname"><a href="config_8h.html">config.h</a></div><div class="ttdoc">Library configuration file.</div></div> <div class="ttc" id="pch_8h_html"><div class="ttname"><a href="pch_8h.html">pch.h</a></div><div class="ttdoc">Precompiled header file.</div></div> <div class="ttc" id="namespace_crypto_p_p_html"><div class="ttname"><a href="namespace_crypto_p_p.html">CryptoPP</a></div><div class="ttdoc">Crypto++ library namespace.</div></div> </div><!-- fragment --></div><!-- contents --> <!-- start footer part --> <hr class="footer"/><address class="footer"><small> Generated on Wed Nov 27 2019 15:03:27 for Crypto++ by  <a href="http://www.doxygen.org/index.html"> <img class="footer" src="doxygen.png" alt="doxygen"/> </a> 1.8.15 </small></address> </body> </html>