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<a href="crc64__clmul_8c.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span><span class="comment">/*</span></div>
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<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="comment"> * This file is part of the Aaru Data Preservation Suite.</span></div>
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<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span><span class="comment"> * Copyright (c) 2019-2025 Natalia Portillo.</span></div>
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<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span><span class="comment"> *</span></div>
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<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span><span class="comment"> * This library is free software; you can redistribute it and/or modify</span></div>
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<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span><span class="comment"> * it under the terms of the GNU Lesser General Public License as</span></div>
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<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="comment"> * published by the Free Software Foundation; either version 2.1 of the</span></div>
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<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="comment"> * License, or (at your option) any later version.</span></div>
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<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="comment"> *</span></div>
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<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span><span class="comment"> * This library is distributed in the hope that it will be useful, but</span></div>
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<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span><span class="comment"> * WITHOUT ANY WARRANTY; without even the implied warranty of</span></div>
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<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span><span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</span></div>
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<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span><span class="comment"> * Lesser General Public License for more details.</span></div>
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<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span><span class="comment"> *</span></div>
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<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span><span class="comment"> * You should have received a copy of the GNU Lesser General Public</span></div>
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<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span><span class="comment"> * License along with this library; if not, see <http://www.gnu.org/licenses/>.</span></div>
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<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span><span class="comment"> */</span></div>
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<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span> </div>
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<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span><span class="preprocessor">#if defined(__x86_64__) || defined(__amd64) || defined(_M_AMD64) || defined(_M_X64) || defined(__I386__) || \</span></div>
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<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span><span class="preprocessor"> defined(__i386__) || defined(__THW_INTEL) || defined(_M_IX86)</span></div>
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<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span> </div>
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<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span><span class="preprocessor">#include <inttypes.h></span></div>
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<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span><span class="preprocessor">#include <smmintrin.h></span></div>
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<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"> 24</span><span class="preprocessor">#include <wmmintrin.h></span></div>
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<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span> </div>
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<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span><span class="preprocessor">#include "<a class="code" href="log_8h.html">log.h</a>"</span></div>
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<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span> </div>
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<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span><span class="preprocessor">#ifdef _MSC_VER</span></div>
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<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span><span class="preprocessor">#include <intrin.h></span></div>
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<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span><span class="preprocessor">#endif</span></div>
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<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span> </div>
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<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span><span class="preprocessor">#include <<a class="code" href="aaruformat_8h.html">aaruformat.h</a>></span></div>
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<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span> </div>
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<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span><span class="comment">// Reverses bits</span></div>
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<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span><span class="keyword">static</span> uint64_t bitReflect(uint64_t v)</div>
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<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span>{</div>
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<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span> v = v >> 1 & 0x5555555555555555 | (v & 0x5555555555555555) << 1;</div>
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<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span> v = v >> 2 & 0x3333333333333333 | (v & 0x3333333333333333) << 2;</div>
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<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span> v = v >> 4 & 0x0F0F0F0F0F0F0F0F | (v & 0x0F0F0F0F0F0F0F0F) << 4;</div>
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<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span> v = v >> 8 & 0x00FF00FF00FF00FF | (v & 0x00FF00FF00FF00FF) << 8;</div>
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<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span> v = v >> 16 & 0x0000FFFF0000FFFF | (v & 0x0000FFFF0000FFFF) << 16;</div>
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<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span> v = v >> 32 | v << 32;</div>
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<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span> <span class="keywordflow">return</span> v;</div>
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<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span>}</div>
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<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> </div>
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<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span><span class="comment">// Computes r*x^N mod p(x)</span></div>
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<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span><span class="keyword">static</span> uint64_t expMod65(uint32_t n, uint64_t p, uint64_t r)</div>
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<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span>{</div>
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<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span> <span class="keywordflow">return</span> n == 0 ? r : expMod65(n - 1, p, r << 1 ^ p & (int64_t)r >> 63);</div>
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<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span>}</div>
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<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span> </div>
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<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span><span class="comment">// Computes x^129 / p(x); the result has an implicit 65th bit.</span></div>
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<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span><span class="keyword">static</span> uint64_t div129by65(uint64_t poly)</div>
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<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span>{</div>
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<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span> uint64_t q = 0;</div>
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<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span> uint64_t h = poly;</div>
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<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span> <span class="keywordflow">for</span>(uint32_t i = 0; i < 64; ++i)</div>
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<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span> {</div>
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<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span> q |= (h & 1ull << 63) >> i;</div>
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<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> h = h << 1 ^ poly & (int64_t)h >> 63;</div>
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<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> }</div>
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<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> <span class="keywordflow">return</span> q;</div>
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<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span>}</div>
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<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> </div>
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<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span><span class="keyword">static</span> <span class="keyword">const</span> uint8_t shuffleMasks[] = {</div>
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<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,</div>
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<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> 0x8f, 0x8e, 0x8d, 0x8c, 0x8b, 0x8a, 0x89, 0x88, 0x87, 0x86, 0x85, 0x84, 0x83, 0x82, 0x81, 0x80,</div>
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<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span>};</div>
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<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> </div>
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<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span>CLMUL <span class="keyword">static</span> <span class="keywordtype">void</span> shiftRight128(__m128i in, <span class="keywordtype">size_t</span> n, __m128i *out_left, __m128i *out_right)</div>
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<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span>{</div>
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<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> <span class="keyword">const</span> __m128i mask_a = _mm_loadu_si128((<span class="keyword">const</span> __m128i *)(shuffleMasks + (16 - n)));</div>
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<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span> <span class="keyword">const</span> __m128i mask_b = _mm_xor_si128(mask_a, _mm_cmpeq_epi8(_mm_setzero_si128(), _mm_setzero_si128()));</div>
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<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span> </div>
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<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> *out_left = _mm_shuffle_epi8(in, mask_b);</div>
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<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span> *out_right = _mm_shuffle_epi8(in, mask_a);</div>
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<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span>}</div>
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<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span> </div>
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<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span>CLMUL <span class="keyword">static</span> __m128i fold(__m128i in, __m128i fold_constants)</div>
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<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span>{</div>
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<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span> <span class="keywordflow">return</span> _mm_xor_si128(_mm_clmulepi64_si128(in, fold_constants, 0x00),</div>
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<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span> _mm_clmulepi64_si128(in, fold_constants, 0x11));</div>
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<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span>}</div>
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<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span></div>
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<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span><a class="code hl_define" href="decls_8h.html#a9001412c35f3c92d3a9320d27b0d97f9">AARU_EXPORT</a> CLMUL uint64_t <a class="code hl_define" href="decls_8h.html#a018e0da1c1f7e4f6187a982c0e40e056">AARU_CALL</a> aaruf_crc64_clmul(<span class="keyword">const</span> uint64_t crc, <span class="keyword">const</span> uint8_t *data, <span class="keywordtype">long</span> length)</div>
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<div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span>{</div>
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<div class="line"><a id="l00095" name="l00095"></a><span class="lineno"> 95</span> <a class="code hl_define" href="log_8h.html#a21cc0459b78d5f2d7bd737e5aae1278a">TRACE</a>(<span class="stringliteral">"Entering aaruf_crc64_clmul(%"</span> PRIu64 <span class="stringliteral">", %p, %ld)"</span>, crc, data, length);</div>
|
||
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|
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno"> 96</span> </div>
|
||
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<div class="line"><a id="l00097" name="l00097"></a><span class="lineno"> 97</span> <span class="keyword">const</span> uint64_t k1 = 0xe05dd497ca393ae4; <span class="comment">// bitReflect(expMod65(128 + 64, poly, 1)) << 1;</span></div>
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||
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|
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno"> 98</span> <span class="keyword">const</span> uint64_t k2 = 0xdabe95afc7875f40; <span class="comment">// bitReflect(expMod65(128, poly, 1)) << 1;</span></div>
|
||
|
|
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno"> 99</span> <span class="keyword">const</span> uint64_t mu = 0x9c3e466c172963d5; <span class="comment">// (bitReflect(div129by65(poly)) << 1) | 1;</span></div>
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||
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|
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno"> 100</span> <span class="keyword">const</span> uint64_t p = 0x92d8af2baf0e1e85; <span class="comment">// (bitReflect(poly) << 1) | 1;</span></div>
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||
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|
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno"> 101</span> </div>
|
||
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<div class="line"><a id="l00102" name="l00102"></a><span class="lineno"> 102</span> <span class="keyword">const</span> __m128i fold_constants_1 = _mm_set_epi64x(k2, k1);</div>
|
||
|
|
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno"> 103</span> <span class="keyword">const</span> __m128i fold_constants_2 = _mm_set_epi64x(p, mu);</div>
|
||
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|
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno"> 104</span> </div>
|
||
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|
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno"> 105</span> <span class="keyword">const</span> uint8_t *end = data + length;</div>
|
||
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|
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno"> 106</span> </div>
|
||
|
|
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno"> 107</span> <span class="comment">// Align pointers</span></div>
|
||
|
|
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno"> 108</span> <span class="keyword">const</span> __m128i *aligned_data = (<span class="keyword">const</span> __m128i *)((uintptr_t)data & ~(uintptr_t)15);</div>
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||
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|
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno"> 109</span> <span class="keyword">const</span> __m128i *aligned_end = (<span class="keyword">const</span> __m128i *)((uintptr_t)end + 15 & ~(uintptr_t)15);</div>
|
||
|
|
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno"> 110</span> </div>
|
||
|
|
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno"> 111</span> <span class="keyword">const</span> <span class="keywordtype">size_t</span> lead_in_size = data - (<span class="keyword">const</span> uint8_t *)aligned_data;</div>
|
||
|
|
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno"> 112</span> <span class="keyword">const</span> <span class="keywordtype">size_t</span> lead_out_size = (<span class="keyword">const</span> uint8_t *)aligned_end - end;</div>
|
||
|
|
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno"> 113</span> </div>
|
||
|
|
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno"> 114</span> <span class="keyword">const</span> <span class="keywordtype">size_t</span> aligned_length = aligned_end - aligned_data;</div>
|
||
|
|
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno"> 115</span> </div>
|
||
|
|
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno"> 116</span> <span class="keyword">const</span> __m128i lead_in_mask = _mm_loadu_si128((<span class="keyword">const</span> __m128i *)(shuffleMasks + (16 - lead_in_size)));</div>
|
||
|
|
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno"> 117</span> <span class="keyword">const</span> __m128i data0 = _mm_blendv_epi8(_mm_setzero_si128(), _mm_load_si128(aligned_data), lead_in_mask);</div>
|
||
|
|
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno"> 118</span> </div>
|
||
|
|
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno"> 119</span><span class="preprocessor">#if defined(_WIN64)</span></div>
|
||
|
|
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno"> 120</span> <span class="keyword">const</span> __m128i initial_crc = _mm_cvtsi64x_si128(~crc);</div>
|
||
|
|
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno"> 121</span><span class="preprocessor">#else</span></div>
|
||
|
|
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno"> 122</span> <span class="keyword">const</span> __m128i initial_crc = _mm_set_epi64x(0, ~crc);</div>
|
||
|
|
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno"> 123</span><span class="preprocessor">#endif</span></div>
|
||
|
|
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno"> 124</span> </div>
|
||
|
|
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno"> 125</span> __m128i r_reg;</div>
|
||
|
|
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno"> 126</span> <span class="keywordflow">if</span>(aligned_length == 1)</div>
|
||
|
|
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno"> 127</span> {</div>
|
||
|
|
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno"> 128</span> <span class="comment">// Single data block, initial CRC possibly bleeds into zero padding</span></div>
|
||
|
|
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno"> 129</span> __m128i crc0, crc1;</div>
|
||
|
|
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno"> 130</span> shiftRight128(initial_crc, 16 - length, &crc0, &crc1);</div>
|
||
|
|
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno"> 131</span> </div>
|
||
|
|
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno"> 132</span> __m128i a_reg, b_reg;</div>
|
||
|
|
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno"> 133</span> shiftRight128(data0, lead_out_size, &a_reg, &b_reg);</div>
|
||
|
|
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno"> 134</span> </div>
|
||
|
|
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno"> 135</span> <span class="keyword">const</span> __m128i p_reg = _mm_xor_si128(a_reg, crc0);</div>
|
||
|
|
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno"> 136</span> r_reg = _mm_xor_si128(_mm_clmulepi64_si128(p_reg, fold_constants_1, 0x10),</div>
|
||
|
|
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno"> 137</span> _mm_xor_si128(_mm_srli_si128(p_reg, 8), _mm_slli_si128(crc1, 8)));</div>
|
||
|
|
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno"> 138</span> }</div>
|
||
|
|
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno"> 139</span> <span class="keywordflow">else</span> <span class="keywordflow">if</span>(aligned_length == 2)</div>
|
||
|
|
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno"> 140</span> {</div>
|
||
|
|
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno"> 141</span> <span class="keyword">const</span> __m128i data1 = _mm_load_si128(aligned_data + 1);</div>
|
||
|
|
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno"> 142</span> </div>
|
||
|
|
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno"> 143</span> <span class="keywordflow">if</span>(length < 8)</div>
|
||
|
|
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno"> 144</span> {</div>
|
||
|
|
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno"> 145</span> <span class="comment">// Initial CRC bleeds into the zero padding</span></div>
|
||
|
|
<div class="line"><a id="l00146" name="l00146"></a><span class="lineno"> 146</span> __m128i crc0, crc1;</div>
|
||
|
|
<div class="line"><a id="l00147" name="l00147"></a><span class="lineno"> 147</span> shiftRight128(initial_crc, 16 - length, &crc0, &crc1);</div>
|
||
|
|
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno"> 148</span> </div>
|
||
|
|
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno"> 149</span> __m128i a_reg, b_reg, c_reg, d_reg;</div>
|
||
|
|
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno"> 150</span> shiftRight128(data0, lead_out_size, &a_reg, &b_reg);</div>
|
||
|
|
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno"> 151</span> shiftRight128(data1, lead_out_size, &c_reg, &d_reg);</div>
|
||
|
|
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno"> 152</span> </div>
|
||
|
|
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno"> 153</span> <span class="keyword">const</span> __m128i p_reg = _mm_xor_si128(_mm_xor_si128(b_reg, c_reg), crc0);</div>
|
||
|
|
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno"> 154</span> r_reg = _mm_xor_si128(_mm_clmulepi64_si128(p_reg, fold_constants_1, 0x10),</div>
|
||
|
|
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno"> 155</span> _mm_xor_si128(_mm_srli_si128(p_reg, 8), _mm_slli_si128(crc1, 8)));</div>
|
||
|
|
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno"> 156</span> }</div>
|
||
|
|
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno"> 157</span> <span class="keywordflow">else</span></div>
|
||
|
|
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno"> 158</span> {</div>
|
||
|
|
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno"> 159</span> <span class="comment">// We can fit the initial CRC into the data without bleeding into the zero padding</span></div>
|
||
|
|
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno"> 160</span> __m128i crc0, crc1;</div>
|
||
|
|
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno"> 161</span> shiftRight128(initial_crc, lead_in_size, &crc0, &crc1);</div>
|
||
|
|
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno"> 162</span> </div>
|
||
|
|
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno"> 163</span> __m128i a_reg, b_reg, c_reg, d_reg;</div>
|
||
|
|
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno"> 164</span> shiftRight128(_mm_xor_si128(data0, crc0), lead_out_size, &a_reg, &b_reg);</div>
|
||
|
|
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno"> 165</span> shiftRight128(_mm_xor_si128(data1, crc1), lead_out_size, &c_reg, &d_reg);</div>
|
||
|
|
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno"> 166</span> </div>
|
||
|
|
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno"> 167</span> <span class="keyword">const</span> __m128i p_reg = _mm_xor_si128(fold(a_reg, fold_constants_1), _mm_xor_si128(b_reg, c_reg));</div>
|
||
|
|
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno"> 168</span> r_reg = _mm_xor_si128(_mm_clmulepi64_si128(p_reg, fold_constants_1, 0x10), _mm_srli_si128(p_reg, 8));</div>
|
||
|
|
<div class="line"><a id="l00169" name="l00169"></a><span class="lineno"> 169</span> }</div>
|
||
|
|
<div class="line"><a id="l00170" name="l00170"></a><span class="lineno"> 170</span> }</div>
|
||
|
|
<div class="line"><a id="l00171" name="l00171"></a><span class="lineno"> 171</span> <span class="keywordflow">else</span></div>
|
||
|
|
<div class="line"><a id="l00172" name="l00172"></a><span class="lineno"> 172</span> {</div>
|
||
|
|
<div class="line"><a id="l00173" name="l00173"></a><span class="lineno"> 173</span> aligned_data++;</div>
|
||
|
|
<div class="line"><a id="l00174" name="l00174"></a><span class="lineno"> 174</span> length -= 16 - lead_in_size;</div>
|
||
|
|
<div class="line"><a id="l00175" name="l00175"></a><span class="lineno"> 175</span> </div>
|
||
|
|
<div class="line"><a id="l00176" name="l00176"></a><span class="lineno"> 176</span> <span class="comment">// Initial CRC can simply be added to data</span></div>
|
||
|
|
<div class="line"><a id="l00177" name="l00177"></a><span class="lineno"> 177</span> __m128i crc0, crc1;</div>
|
||
|
|
<div class="line"><a id="l00178" name="l00178"></a><span class="lineno"> 178</span> shiftRight128(initial_crc, lead_in_size, &crc0, &crc1);</div>
|
||
|
|
<div class="line"><a id="l00179" name="l00179"></a><span class="lineno"> 179</span> </div>
|
||
|
|
<div class="line"><a id="l00180" name="l00180"></a><span class="lineno"> 180</span> __m128i accumulator = _mm_xor_si128(fold(_mm_xor_si128(crc0, data0), fold_constants_1), crc1);</div>
|
||
|
|
<div class="line"><a id="l00181" name="l00181"></a><span class="lineno"> 181</span> </div>
|
||
|
|
<div class="line"><a id="l00182" name="l00182"></a><span class="lineno"> 182</span> <span class="keywordflow">while</span>(length >= 32)</div>
|
||
|
|
<div class="line"><a id="l00183" name="l00183"></a><span class="lineno"> 183</span> {</div>
|
||
|
|
<div class="line"><a id="l00184" name="l00184"></a><span class="lineno"> 184</span> accumulator = fold(_mm_xor_si128(_mm_load_si128(aligned_data), accumulator), fold_constants_1);</div>
|
||
|
|
<div class="line"><a id="l00185" name="l00185"></a><span class="lineno"> 185</span> </div>
|
||
|
|
<div class="line"><a id="l00186" name="l00186"></a><span class="lineno"> 186</span> length -= 16;</div>
|
||
|
|
<div class="line"><a id="l00187" name="l00187"></a><span class="lineno"> 187</span> aligned_data++;</div>
|
||
|
|
<div class="line"><a id="l00188" name="l00188"></a><span class="lineno"> 188</span> }</div>
|
||
|
|
<div class="line"><a id="l00189" name="l00189"></a><span class="lineno"> 189</span> </div>
|
||
|
|
<div class="line"><a id="l00190" name="l00190"></a><span class="lineno"> 190</span> __m128i p_reg;</div>
|
||
|
|
<div class="line"><a id="l00191" name="l00191"></a><span class="lineno"> 191</span> <span class="keywordflow">if</span>(length == 16) { p_reg = _mm_xor_si128(accumulator, _mm_load_si128(aligned_data)); }</div>
|
||
|
|
<div class="line"><a id="l00192" name="l00192"></a><span class="lineno"> 192</span> <span class="keywordflow">else</span></div>
|
||
|
|
<div class="line"><a id="l00193" name="l00193"></a><span class="lineno"> 193</span> {</div>
|
||
|
|
<div class="line"><a id="l00194" name="l00194"></a><span class="lineno"> 194</span> <span class="keyword">const</span> __m128i end0 = _mm_xor_si128(accumulator, _mm_load_si128(aligned_data));</div>
|
||
|
|
<div class="line"><a id="l00195" name="l00195"></a><span class="lineno"> 195</span> <span class="keyword">const</span> __m128i end1 = _mm_load_si128(aligned_data + 1);</div>
|
||
|
|
<div class="line"><a id="l00196" name="l00196"></a><span class="lineno"> 196</span> </div>
|
||
|
|
<div class="line"><a id="l00197" name="l00197"></a><span class="lineno"> 197</span> __m128i a_reg, b_reg, c_reg, d_reg;</div>
|
||
|
|
<div class="line"><a id="l00198" name="l00198"></a><span class="lineno"> 198</span> shiftRight128(end0, lead_out_size, &a_reg, &b_reg);</div>
|
||
|
|
<div class="line"><a id="l00199" name="l00199"></a><span class="lineno"> 199</span> shiftRight128(end1, lead_out_size, &c_reg, &d_reg);</div>
|
||
|
|
<div class="line"><a id="l00200" name="l00200"></a><span class="lineno"> 200</span> </div>
|
||
|
|
<div class="line"><a id="l00201" name="l00201"></a><span class="lineno"> 201</span> p_reg = _mm_xor_si128(fold(a_reg, fold_constants_1), _mm_or_si128(b_reg, c_reg));</div>
|
||
|
|
<div class="line"><a id="l00202" name="l00202"></a><span class="lineno"> 202</span> }</div>
|
||
|
|
<div class="line"><a id="l00203" name="l00203"></a><span class="lineno"> 203</span> </div>
|
||
|
|
<div class="line"><a id="l00204" name="l00204"></a><span class="lineno"> 204</span> r_reg = _mm_xor_si128(_mm_clmulepi64_si128(p_reg, fold_constants_1, 0x10), _mm_srli_si128(p_reg, 8));</div>
|
||
|
|
<div class="line"><a id="l00205" name="l00205"></a><span class="lineno"> 205</span> }</div>
|
||
|
|
<div class="line"><a id="l00206" name="l00206"></a><span class="lineno"> 206</span> </div>
|
||
|
|
<div class="line"><a id="l00207" name="l00207"></a><span class="lineno"> 207</span> <span class="comment">// Final Barrett reduction</span></div>
|
||
|
|
<div class="line"><a id="l00208" name="l00208"></a><span class="lineno"> 208</span> <span class="keyword">const</span> __m128i t1_reg = _mm_clmulepi64_si128(r_reg, fold_constants_2, 0x00);</div>
|
||
|
|
<div class="line"><a id="l00209" name="l00209"></a><span class="lineno"> 209</span> <span class="keyword">const</span> __m128i t2_reg = _mm_xor_si128(</div>
|
||
|
|
<div class="line"><a id="l00210" name="l00210"></a><span class="lineno"> 210</span> _mm_xor_si128(_mm_clmulepi64_si128(t1_reg, fold_constants_2, 0x10), _mm_slli_si128(t1_reg, 8)), r_reg);</div>
|
||
|
|
<div class="line"><a id="l00211" name="l00211"></a><span class="lineno"> 211</span> </div>
|
||
|
|
<div class="line"><a id="l00212" name="l00212"></a><span class="lineno"> 212</span> <a class="code hl_define" href="log_8h.html#a21cc0459b78d5f2d7bd737e5aae1278a">TRACE</a>(<span class="stringliteral">"Exiting aaruf_crc64_clmul()"</span>);</div>
|
||
|
|
<div class="line"><a id="l00213" name="l00213"></a><span class="lineno"> 213</span> </div>
|
||
|
|
<div class="line"><a id="l00214" name="l00214"></a><span class="lineno"> 214</span><span class="preprocessor">#if defined(_WIN64)</span></div>
|
||
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<div class="line"><a id="l00215" name="l00215"></a><span class="lineno"> 215</span> <span class="keywordflow">return</span> ~_mm_extract_epi64(t2_reg, 1);</div>
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<div class="line"><a id="l00216" name="l00216"></a><span class="lineno"> 216</span><span class="preprocessor">#else</span></div>
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<div class="line"><a id="l00217" name="l00217"></a><span class="lineno"> 217</span> <span class="keywordflow">return</span> ~((uint64_t)(uint32_t)_mm_extract_epi32(t2_reg, 3) << 32 | (uint64_t)(uint32_t)_mm_extract_epi32(t2_reg, 2));</div>
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<div class="line"><a id="l00218" name="l00218"></a><span class="lineno"> 218</span><span class="preprocessor">#endif</span></div>
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<div class="line"><a id="l00219" name="l00219"></a><span class="lineno"> 219</span>}</div>
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<div class="line"><a id="l00220" name="l00220"></a><span class="lineno"> 220</span> </div>
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<div class="line"><a id="l00221" name="l00221"></a><span class="lineno"> 221</span><span class="preprocessor">#endif</span></div>
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