94 строки
5.4 KiB
C
94 строки
5.4 KiB
C
/*
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* Copyright (c) 2015 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "vp10/common/divide.h"
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/* Constants for divide by multiply for small divisors generated with:
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void init_fastdiv() {
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int i;
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for (i = 3; i < 256; ++i) {
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const int s = 31 ^ __builtin_clz(2 * i + 1);
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const unsigned long long base = (1ull << (sizeof(unsigned) * 8 + s)) - 1;
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fastdiv_tab[i].mult = (base / i + 1) & 0xFFFFFFFF;
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fastdiv_tab[i].shift = s;
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}
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for (i = 0; i < 8; ++i) {
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fastdiv_tab[1 << i].mult = 0;
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fastdiv_tab[1 << i].shift = i;
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}
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}
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*/
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const struct fastdiv_elem vp10_fastdiv_tab[256] = {
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{0, 0}, {0, 0}, {0, 1}, {1431655766, 2},
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{0, 2}, {2576980378, 3}, {1431655766, 3}, {613566757, 3},
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{0, 3}, {3340530120, 4}, {2576980378, 4}, {1952257862, 4},
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{1431655766, 4}, {991146300, 4}, {613566757, 4}, {286331154, 4},
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{0, 4}, {3789677026, 5}, {3340530120, 5}, {2938661835, 5},
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{2576980378, 5}, {2249744775, 5}, {1952257862, 5}, {1680639377, 5},
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{1431655766, 5}, {1202590843, 5}, {991146300, 5}, {795364315, 5},
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{613566757, 5}, {444306962, 5}, {286331154, 5}, {138547333, 5},
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{0, 5}, {4034666248, 6}, {3789677026, 6}, {3558687189, 6},
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{3340530120, 6}, {3134165325, 6}, {2938661835, 6}, {2753184165, 6},
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{2576980378, 6}, {2409371898, 6}, {2249744775, 6}, {2097542168, 6},
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{1952257862, 6}, {1813430637, 6}, {1680639377, 6}, {1553498810, 6},
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{1431655766, 6}, {1314785907, 6}, {1202590843, 6}, {1094795586, 6},
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{991146300, 6}, {891408307, 6}, {795364315, 6}, {702812831, 6},
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{613566757, 6}, {527452125, 6}, {444306962, 6}, {363980280, 6},
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{286331154, 6}, {211227900, 6}, {138547333, 6}, {68174085, 6},
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{0, 6}, {4162814457, 7}, {4034666248, 7}, {3910343360, 7},
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{3789677026, 7}, {3672508268, 7}, {3558687189, 7}, {3448072337, 7},
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{3340530120, 7}, {3235934265, 7}, {3134165325, 7}, {3035110223, 7},
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{2938661835, 7}, {2844718599, 7}, {2753184165, 7}, {2663967058, 7},
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{2576980378, 7}, {2492141518, 7}, {2409371898, 7}, {2328596727, 7},
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{2249744775, 7}, {2172748162, 7}, {2097542168, 7}, {2024065048, 7},
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{1952257862, 7}, {1882064321, 7}, {1813430637, 7}, {1746305385, 7},
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{1680639377, 7}, {1616385542, 7}, {1553498810, 7}, {1491936009, 7},
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{1431655766, 7}, {1372618415, 7}, {1314785907, 7}, {1258121734, 7},
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{1202590843, 7}, {1148159575, 7}, {1094795586, 7}, {1042467791, 7},
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{991146300, 7}, {940802361, 7}, {891408307, 7}, {842937507, 7},
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{795364315, 7}, {748664025, 7}, {702812831, 7}, {657787785, 7},
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{613566757, 7}, {570128403, 7}, {527452125, 7}, {485518043, 7},
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{444306962, 7}, {403800345, 7}, {363980280, 7}, {324829460, 7},
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{286331154, 7}, {248469183, 7}, {211227900, 7}, {174592167, 7},
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{138547333, 7}, {103079216, 7}, {68174085, 7}, {33818641, 7},
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{0, 7}, {4228378656, 8}, {4162814457, 8}, {4098251237, 8},
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{4034666248, 8}, {3972037425, 8}, {3910343360, 8}, {3849563281, 8},
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{3789677026, 8}, {3730665024, 8}, {3672508268, 8}, {3615188300, 8},
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{3558687189, 8}, {3502987511, 8}, {3448072337, 8}, {3393925206, 8},
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{3340530120, 8}, {3287871517, 8}, {3235934265, 8}, {3184703642, 8},
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{3134165325, 8}, {3084305374, 8}, {3035110223, 8}, {2986566663, 8},
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{2938661835, 8}, {2891383213, 8}, {2844718599, 8}, {2798656110, 8},
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{2753184165, 8}, {2708291480, 8}, {2663967058, 8}, {2620200175, 8},
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{2576980378, 8}, {2534297473, 8}, {2492141518, 8}, {2450502814, 8},
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{2409371898, 8}, {2368739540, 8}, {2328596727, 8}, {2288934667, 8},
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{2249744775, 8}, {2211018668, 8}, {2172748162, 8}, {2134925265, 8},
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{2097542168, 8}, {2060591247, 8}, {2024065048, 8}, {1987956292, 8},
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{1952257862, 8}, {1916962805, 8}, {1882064321, 8}, {1847555765, 8},
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{1813430637, 8}, {1779682582, 8}, {1746305385, 8}, {1713292966, 8},
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{1680639377, 8}, {1648338801, 8}, {1616385542, 8}, {1584774030, 8},
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{1553498810, 8}, {1522554545, 8}, {1491936009, 8}, {1461638086, 8},
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{1431655766, 8}, {1401984144, 8}, {1372618415, 8}, {1343553873, 8},
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{1314785907, 8}, {1286310003, 8}, {1258121734, 8}, {1230216764, 8},
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{1202590843, 8}, {1175239808, 8}, {1148159575, 8}, {1121346142, 8},
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{1094795586, 8}, {1068504060, 8}, {1042467791, 8}, {1016683080, 8},
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{991146300, 8}, {965853890, 8}, {940802361, 8}, {915988286, 8},
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{891408307, 8}, {867059126, 8}, {842937507, 8}, {819040276, 8},
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{795364315, 8}, {771906565, 8}, {748664025, 8}, {725633745, 8},
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{702812831, 8}, {680198441, 8}, {657787785, 8}, {635578121, 8},
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{613566757, 8}, {591751050, 8}, {570128403, 8}, {548696263, 8},
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{527452125, 8}, {506393524, 8}, {485518043, 8}, {464823301, 8},
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{444306962, 8}, {423966729, 8}, {403800345, 8}, {383805589, 8},
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{363980280, 8}, {344322273, 8}, {324829460, 8}, {305499766, 8},
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{286331154, 8}, {267321616, 8}, {248469183, 8}, {229771913, 8},
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{211227900, 8}, {192835267, 8}, {174592167, 8}, {156496785, 8},
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{138547333, 8}, {120742053, 8}, {103079216, 8}, {85557118, 8},
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{68174085, 8}, {50928466, 8}, {33818641, 8}, {16843010, 8},
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};
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