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<title>LCOV - lcov.info - raid/gf.h</title>
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<table width="100%" border=0 cellspacing=0 cellpadding=0>
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<tr><td class="title">LCOV - code coverage report</td></tr>
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<td width="10%" class="headerItem">Current view:</td>
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<td width="35%" class="headerValue"><a href="../index.html">top level</a> - <a href="index.html">raid</a> - gf.h<span style="font-size: 80%;"> (source / <a href="gf.h.func.html">functions</a>)</span></td>
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<td width="5%"></td>
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<td width="15%"></td>
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<td width="10%" class="headerCovTableHead">Hit</td>
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<td width="10%" class="headerCovTableHead">Total</td>
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<td width="15%" class="headerCovTableHead">Coverage</td>
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</tr>
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<tr>
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<td class="headerItem">Test:</td>
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<td class="headerValue">lcov.info</td>
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<td></td>
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<td class="headerItem">Lines:</td>
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<td class="headerCovTableEntry">27</td>
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<td class="headerCovTableEntry">27</td>
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<td class="headerCovTableEntryHi">100.0 %</td>
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</tr>
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<tr>
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<td class="headerItem">Date:</td>
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<td class="headerValue">2016-11-21</td>
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<td></td>
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<td class="headerItem">Functions:</td>
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<td class="headerCovTableEntry">0</td>
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<td class="headerCovTableEntry">0</td>
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<td class="headerCovTableEntryHi">-</td>
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</tr>
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<tr><td><img src="../glass.png" width=3 height=3 alt=""></td></tr>
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</table>
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<tr><td class="ruler"><img src="../glass.png" width=3 height=3 alt=""></td></tr>
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</table>
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<table cellpadding=0 cellspacing=0 border=0>
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<tr>
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<td><br></td>
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</tr>
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<tr>
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<td>
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<pre class="sourceHeading"> Line data Source code</pre>
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<pre class="source">
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<a name="1"><span class="lineNum"> 1 </span> : /*</a>
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<span class="lineNum"> 2 </span> : * Copyright (C) 2013 Andrea Mazzoleni
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<span class="lineNum"> 3 </span> : *
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<span class="lineNum"> 4 </span> : * This program is free software: you can redistribute it and/or modify
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<span class="lineNum"> 5 </span> : * it under the terms of the GNU General Public License as published by
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<span class="lineNum"> 6 </span> : * the Free Software Foundation, either version 2 of the License, or
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<span class="lineNum"> 7 </span> : * (at your option) any later version.
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<span class="lineNum"> 8 </span> : *
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<span class="lineNum"> 9 </span> : * This program is distributed in the hope that it will be useful,
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<span class="lineNum"> 10 </span> : * but WITHOUT ANY WARRANTY; without even the implied warranty of
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<span class="lineNum"> 11 </span> : * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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<span class="lineNum"> 12 </span> : * GNU General Public License for more details.
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<span class="lineNum"> 13 </span> : */
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<span class="lineNum"> 14 </span> :
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<span class="lineNum"> 15 </span> : #ifndef __RAID_GF_H
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<span class="lineNum"> 16 </span> : #define __RAID_GF_H
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<span class="lineNum"> 17 </span> :
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<span class="lineNum"> 18 </span> : /*
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<span class="lineNum"> 19 </span> : * Galois field operations.
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<span class="lineNum"> 20 </span> : *
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<span class="lineNum"> 21 </span> : * Basic range checks are implemented using BUG_ON().
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<span class="lineNum"> 22 </span> : */
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<span class="lineNum"> 23 </span> :
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<span class="lineNum"> 24 </span> : /*
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<span class="lineNum"> 25 </span> : * GF a*b.
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<span class="lineNum"> 26 </span> : */
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<span class="lineNum"> 27 </span> : static __always_inline uint8_t mul(uint8_t a, uint8_t b)
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<span class="lineNum"> 28 </span> : {
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<span class="lineNum"> 29 </span><span class="lineCov"> 23791770 : return gfmul[a][b];</span>
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<span class="lineNum"> 30 </span> : }
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<span class="lineNum"> 31 </span> :
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<span class="lineNum"> 32 </span> : /*
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<span class="lineNum"> 33 </span> : * GF 1/a.
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<span class="lineNum"> 34 </span> : * Not defined for a == 0.
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<span class="lineNum"> 35 </span> : */
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<span class="lineNum"> 36 </span> : static __always_inline uint8_t inv(uint8_t v)
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<span class="lineNum"> 37 </span> : {
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<span class="lineNum"> 38 </span><span class="lineCov"> 635424 : BUG_ON(v == 0); /* division by zero */</span>
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<span class="lineNum"> 39 </span> :
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<span class="lineNum"> 40 </span><span class="lineCov"> 635424 : return gfinv[v];</span>
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<span class="lineNum"> 41 </span> : }
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<span class="lineNum"> 42 </span> :
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<span class="lineNum"> 43 </span> : /*
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<span class="lineNum"> 44 </span> : * GF 2^a.
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<span class="lineNum"> 45 </span> : */
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<span class="lineNum"> 46 </span> : static __always_inline uint8_t pow2(int v)
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<span class="lineNum"> 47 </span> : {
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<span class="lineNum"> 48 </span><span class="lineCov"> 396 : BUG_ON(v < 0 || v > 254); /* invalid exponent */</span>
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<span class="lineNum"> 49 </span> :
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<span class="lineNum"> 50 </span><span class="lineCov"> 396 : return gfexp[v];</span>
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<span class="lineNum"> 51 </span> : }
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<span class="lineNum"> 52 </span> :
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<span class="lineNum"> 53 </span> : /*
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<span class="lineNum"> 54 </span> : * Gets the multiplication table for a specified value.
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<span class="lineNum"> 55 </span> : */
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<span class="lineNum"> 56 </span> : static __always_inline const uint8_t *table(uint8_t v)
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<span class="lineNum"> 57 </span> : {
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<span class="lineNum"> 58 </span><span class="lineCov"> 409825 : return gfmul[v];</span>
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<span class="lineNum"> 59 </span> : }
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<span class="lineNum"> 60 </span> :
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<span class="lineNum"> 61 </span> : /*
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<span class="lineNum"> 62 </span> : * Gets the generator matrix coefficient for parity 'p' and disk 'd'.
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<span class="lineNum"> 63 </span> : */
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<span class="lineNum"> 64 </span> : static __always_inline uint8_t A(int p, int d)
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<span class="lineNum"> 65 </span> : {
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<span class="lineNum"> 66 </span><span class="lineCov"> 2604422 : return gfgen[p][d];</span>
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<span class="lineNum"> 67 </span> : }
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<span class="lineNum"> 68 </span> :
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<span class="lineNum"> 69 </span> : /*
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<span class="lineNum"> 70 </span> : * Dereference as uint8_t
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<span class="lineNum"> 71 </span> : */
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<span class="lineNum"> 72 </span> : #define v_8(p) (*(uint8_t *)&(p))
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<span class="lineNum"> 73 </span> :
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<span class="lineNum"> 74 </span> : /*
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<span class="lineNum"> 75 </span> : * Dereference as uint32_t
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<span class="lineNum"> 76 </span> : */
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<span class="lineNum"> 77 </span> : #define v_32(p) (*(uint32_t *)&(p))
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<span class="lineNum"> 78 </span> :
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<span class="lineNum"> 79 </span> : /*
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<span class="lineNum"> 80 </span> : * Dereference as uint64_t
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<span class="lineNum"> 81 </span> : */
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<span class="lineNum"> 82 </span> : #define v_64(p) (*(uint64_t *)&(p))
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<span class="lineNum"> 83 </span> :
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<span class="lineNum"> 84 </span> : /*
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<span class="lineNum"> 85 </span> : * Multiply each byte of a uint32 by 2 in the GF(2^8).
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<span class="lineNum"> 86 </span> : */
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<span class="lineNum"> 87 </span> : static __always_inline uint32_t x2_32(uint32_t v)
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<span class="lineNum"> 88 </span> : {
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<span class="lineNum"> 89 </span><span class="lineCov"> 32577344 : uint32_t mask = v & 0x80808080U;</span>
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<span class="lineNum"> 90 </span> :
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<span class="lineNum"> 91 </span><span class="lineCov"> 32577344 : mask = (mask << 1) - (mask >> 7);</span>
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<span class="lineNum"> 92 </span><span class="lineCov"> 32577344 : v = (v << 1) & 0xfefefefeU;</span>
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<span class="lineNum"> 93 </span><span class="lineCov"> 32577344 : v ^= mask & 0x1d1d1d1dU;</span>
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<span class="lineNum"> 94 </span><span class="lineCov"> 32577344 : return v;</span>
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<span class="lineNum"> 95 </span> : }
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<span class="lineNum"> 96 </span> :
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<span class="lineNum"> 97 </span> : /*
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<span class="lineNum"> 98 </span> : * Multiply each byte of a uint64 by 2 in the GF(2^8).
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<span class="lineNum"> 99 </span> : */
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<span class="lineNum"> 100 </span> : static __always_inline uint64_t x2_64(uint64_t v)
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<span class="lineNum"> 101 </span> : {
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<span class="lineNum"> 102 </span><span class="lineCov"> 16288672 : uint64_t mask = v & 0x8080808080808080ULL;</span>
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<span class="lineNum"> 103 </span> :
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<span class="lineNum"> 104 </span><span class="lineCov"> 16288672 : mask = (mask << 1) - (mask >> 7);</span>
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<span class="lineNum"> 105 </span><span class="lineCov"> 16288672 : v = (v << 1) & 0xfefefefefefefefeULL;</span>
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<span class="lineNum"> 106 </span><span class="lineCov"> 16288672 : v ^= mask & 0x1d1d1d1d1d1d1d1dULL;</span>
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<span class="lineNum"> 107 </span><span class="lineCov"> 16288672 : return v;</span>
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<span class="lineNum"> 108 </span> : }
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<span class="lineNum"> 109 </span> :
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<span class="lineNum"> 110 </span> : /*
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<span class="lineNum"> 111 </span> : * Divide each byte of a uint32 by 2 in the GF(2^8).
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<span class="lineNum"> 112 </span> : */
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<span class="lineNum"> 113 </span> : static __always_inline uint32_t d2_32(uint32_t v)
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<span class="lineNum"> 114 </span> : {
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<span class="lineNum"> 115 </span><span class="lineCov"> 12847040 : uint32_t mask = v & 0x01010101U;</span>
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<span class="lineNum"> 116 </span> :
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<span class="lineNum"> 117 </span><span class="lineCov"> 12847040 : mask = (mask << 8) - mask;</span>
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<span class="lineNum"> 118 </span><span class="lineCov"> 12847040 : v = (v >> 1) & 0x7f7f7f7fU;</span>
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<span class="lineNum"> 119 </span><span class="lineCov"> 12847040 : v ^= mask & 0x8e8e8e8eU;</span>
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<span class="lineNum"> 120 </span><span class="lineCov"> 12847040 : return v;</span>
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<span class="lineNum"> 121 </span> : }
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<span class="lineNum"> 122 </span> :
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<span class="lineNum"> 123 </span> : /*
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<span class="lineNum"> 124 </span> : * Divide each byte of a uint64 by 2 in the GF(2^8).
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<span class="lineNum"> 125 </span> : */
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<span class="lineNum"> 126 </span> : static __always_inline uint64_t d2_64(uint64_t v)
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<span class="lineNum"> 127 </span> : {
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<span class="lineNum"> 128 </span><span class="lineCov"> 6423520 : uint64_t mask = v & 0x0101010101010101ULL;</span>
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<span class="lineNum"> 129 </span> :
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<span class="lineNum"> 130 </span><span class="lineCov"> 6423520 : mask = (mask << 8) - mask;</span>
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<span class="lineNum"> 131 </span><span class="lineCov"> 6423520 : v = (v >> 1) & 0x7f7f7f7f7f7f7f7fULL;</span>
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<span class="lineNum"> 132 </span><span class="lineCov"> 6423520 : v ^= mask & 0x8e8e8e8e8e8e8e8eULL;</span>
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<span class="lineNum"> 133 </span><span class="lineCov"> 6423520 : return v;</span>
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<span class="lineNum"> 134 </span> : }
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<span class="lineNum"> 135 </span> :
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<span class="lineNum"> 136 </span> : #endif
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<span class="lineNum"> 137 </span> :
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</pre>
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</td>
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</tr>
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</table>
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<br>
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<table width="100%" border=0 cellspacing=0 cellpadding=0>
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<tr><td class="ruler"><img src="../glass.png" width=3 height=3 alt=""></td></tr>
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<tr><td class="versionInfo">Generated by: <a href="http://ltp.sourceforge.net/coverage/lcov.php" target="_parent">LCOV version 1.10</a></td></tr>
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</table>
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<br>
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