--- /dev/null
+//! Approximation of log_10 using a lookup table.
+
+const BITS: u32 = 64;
+const HIGHEST_BIT: u32 = BITS - 1;
+const LOWER_BITS: u32 = 6;
+pub(super) const LOWER_BITS_BOUND: u64 = 1 << LOWER_BITS;
+const LOWER_BITMASK: u64 = (1 << LOWER_BITS) - 1;
+
+/// Look-up table for `log10(x) * 2048` where row `i` is used for each `x` having `i` as the
+/// most significant bit. The next 4 bits of `x`, if applicable, are used for the second index.
+const LOG10_TIMES_2048: [[u16; (LOWER_BITS_BOUND) as usize]; BITS as usize] = [
+ [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
+ [617, 617, 617, 617, 617, 617, 617, 617, 617, 617, 617, 617, 617, 617, 617, 617,
+ 617, 617, 617, 617, 617, 617, 617, 617, 617, 617, 617, 617, 617, 617, 617, 617,
+ 977, 977, 977, 977, 977, 977, 977, 977, 977, 977, 977, 977, 977, 977, 977, 977,
+ 977, 977, 977, 977, 977, 977, 977, 977, 977, 977, 977, 977, 977, 977, 977, 977],
+ [1233, 1233, 1233, 1233, 1233, 1233, 1233, 1233, 1233, 1233, 1233, 1233, 1233, 1233, 1233, 1233,
+ 1431, 1431, 1431, 1431, 1431, 1431, 1431, 1431, 1431, 1431, 1431, 1431, 1431, 1431, 1431, 1431,
+ 1594, 1594, 1594, 1594, 1594, 1594, 1594, 1594, 1594, 1594, 1594, 1594, 1594, 1594, 1594, 1594,
+ 1731, 1731, 1731, 1731, 1731, 1731, 1731, 1731, 1731, 1731, 1731, 1731, 1731, 1731, 1731, 1731],
+ [1850, 1850, 1850, 1850, 1850, 1850, 1850, 1850, 1954, 1954, 1954, 1954, 1954, 1954, 1954, 1954,
+ 2048, 2048, 2048, 2048, 2048, 2048, 2048, 2048, 2133, 2133, 2133, 2133, 2133, 2133, 2133, 2133,
+ 2210, 2210, 2210, 2210, 2210, 2210, 2210, 2210, 2281, 2281, 2281, 2281, 2281, 2281, 2281, 2281,
+ 2347, 2347, 2347, 2347, 2347, 2347, 2347, 2347, 2409, 2409, 2409, 2409, 2409, 2409, 2409, 2409],
+ [2466, 2466, 2466, 2466, 2520, 2520, 2520, 2520, 2571, 2571, 2571, 2571, 2619, 2619, 2619, 2619,
+ 2665, 2665, 2665, 2665, 2708, 2708, 2708, 2708, 2749, 2749, 2749, 2749, 2789, 2789, 2789, 2789,
+ 2827, 2827, 2827, 2827, 2863, 2863, 2863, 2863, 2898, 2898, 2898, 2898, 2931, 2931, 2931, 2931,
+ 2964, 2964, 2964, 2964, 2995, 2995, 2995, 2995, 3025, 3025, 3025, 3025, 3054, 3054, 3054, 3054],
+ [3083, 3083, 3110, 3110, 3136, 3136, 3162, 3162, 3187, 3187, 3212, 3212, 3235, 3235, 3259, 3259,
+ 3281, 3281, 3303, 3303, 3324, 3324, 3345, 3345, 3366, 3366, 3386, 3386, 3405, 3405, 3424, 3424,
+ 3443, 3443, 3462, 3462, 3479, 3479, 3497, 3497, 3514, 3514, 3531, 3531, 3548, 3548, 3564, 3564,
+ 3580, 3580, 3596, 3596, 3612, 3612, 3627, 3627, 3642, 3642, 3656, 3656, 3671, 3671, 3685, 3685],
+ [3699, 3713, 3726, 3740, 3753, 3766, 3779, 3791, 3804, 3816, 3828, 3840, 3852, 3864, 3875, 3886,
+ 3898, 3909, 3919, 3930, 3941, 3951, 3962, 3972, 3982, 3992, 4002, 4012, 4022, 4031, 4041, 4050,
+ 4060, 4069, 4078, 4087, 4096, 4105, 4114, 4122, 4131, 4139, 4148, 4156, 4164, 4173, 4181, 4189,
+ 4197, 4205, 4213, 4220, 4228, 4236, 4243, 4251, 4258, 4266, 4273, 4280, 4287, 4294, 4302, 4309],
+ [4316, 4329, 4343, 4356, 4369, 4382, 4395, 4408, 4420, 4433, 4445, 4457, 4468, 4480, 4492, 4503,
+ 4514, 4525, 4536, 4547, 4557, 4568, 4578, 4589, 4599, 4609, 4619, 4629, 4638, 4648, 4657, 4667,
+ 4676, 4685, 4695, 4704, 4713, 4721, 4730, 4739, 4747, 4756, 4764, 4773, 4781, 4789, 4797, 4805,
+ 4813, 4821, 4829, 4837, 4845, 4852, 4860, 4867, 4875, 4882, 4889, 4897, 4904, 4911, 4918, 4925],
+ [4932, 4946, 4959, 4973, 4986, 4999, 5012, 5024, 5037, 5049, 5061, 5073, 5085, 5097, 5108, 5119,
+ 5131, 5142, 5153, 5163, 5174, 5184, 5195, 5205, 5215, 5225, 5235, 5245, 5255, 5264, 5274, 5283,
+ 5293, 5302, 5311, 5320, 5329, 5338, 5347, 5355, 5364, 5372, 5381, 5389, 5397, 5406, 5414, 5422,
+ 5430, 5438, 5446, 5453, 5461, 5469, 5476, 5484, 5491, 5499, 5506, 5513, 5520, 5527, 5535, 5542],
+ [5549, 5562, 5576, 5589, 5603, 5615, 5628, 5641, 5653, 5666, 5678, 5690, 5701, 5713, 5725, 5736,
+ 5747, 5758, 5769, 5780, 5790, 5801, 5811, 5822, 5832, 5842, 5852, 5862, 5871, 5881, 5890, 5900,
+ 5909, 5918, 5928, 5937, 5946, 5954, 5963, 5972, 5980, 5989, 5997, 6006, 6014, 6022, 6030, 6038,
+ 6046, 6054, 6062, 6070, 6078, 6085, 6093, 6100, 6108, 6115, 6122, 6130, 6137, 6144, 6151, 6158],
+ [6165, 6179, 6192, 6206, 6219, 6232, 6245, 6257, 6270, 6282, 6294, 6306, 6318, 6330, 6341, 6352,
+ 6364, 6375, 6386, 6396, 6407, 6417, 6428, 6438, 6448, 6458, 6468, 6478, 6488, 6497, 6507, 6516,
+ 6526, 6535, 6544, 6553, 6562, 6571, 6580, 6588, 6597, 6605, 6614, 6622, 6630, 6639, 6647, 6655,
+ 6663, 6671, 6679, 6686, 6694, 6702, 6709, 6717, 6724, 6732, 6739, 6746, 6753, 6761, 6768, 6775],
+ [6782, 6795, 6809, 6822, 6836, 6849, 6861, 6874, 6886, 6899, 6911, 6923, 6934, 6946, 6958, 6969,
+ 6980, 6991, 7002, 7013, 7023, 7034, 7044, 7055, 7065, 7075, 7085, 7095, 7104, 7114, 7124, 7133,
+ 7142, 7151, 7161, 7170, 7179, 7187, 7196, 7205, 7213, 7222, 7230, 7239, 7247, 7255, 7263, 7271,
+ 7279, 7287, 7295, 7303, 7311, 7318, 7326, 7333, 7341, 7348, 7355, 7363, 7370, 7377, 7384, 7391],
+ [7398, 7412, 7425, 7439, 7452, 7465, 7478, 7490, 7503, 7515, 7527, 7539, 7551, 7563, 7574, 7585,
+ 7597, 7608, 7619, 7629, 7640, 7651, 7661, 7671, 7681, 7691, 7701, 7711, 7721, 7731, 7740, 7749,
+ 7759, 7768, 7777, 7786, 7795, 7804, 7813, 7821, 7830, 7838, 7847, 7855, 7864, 7872, 7880, 7888,
+ 7896, 7904, 7912, 7919, 7927, 7935, 7942, 7950, 7957, 7965, 7972, 7979, 7986, 7994, 8001, 8008],
+ [8015, 8028, 8042, 8055, 8069, 8082, 8094, 8107, 8119, 8132, 8144, 8156, 8167, 8179, 8191, 8202,
+ 8213, 8224, 8235, 8246, 8256, 8267, 8277, 8288, 8298, 8308, 8318, 8328, 8337, 8347, 8357, 8366,
+ 8375, 8384, 8394, 8403, 8412, 8420, 8429, 8438, 8446, 8455, 8463, 8472, 8480, 8488, 8496, 8504,
+ 8512, 8520, 8528, 8536, 8544, 8551, 8559, 8566, 8574, 8581, 8588, 8596, 8603, 8610, 8617, 8624],
+ [8631, 8645, 8659, 8672, 8685, 8698, 8711, 8723, 8736, 8748, 8760, 8772, 8784, 8796, 8807, 8818,
+ 8830, 8841, 8852, 8862, 8873, 8884, 8894, 8904, 8914, 8924, 8934, 8944, 8954, 8964, 8973, 8982,
+ 8992, 9001, 9010, 9019, 9028, 9037, 9046, 9054, 9063, 9071, 9080, 9088, 9097, 9105, 9113, 9121,
+ 9129, 9137, 9145, 9152, 9160, 9168, 9175, 9183, 9190, 9198, 9205, 9212, 9219, 9227, 9234, 9241],
+ [9248, 9261, 9275, 9288, 9302, 9315, 9327, 9340, 9352, 9365, 9377, 9389, 9400, 9412, 9424, 9435,
+ 9446, 9457, 9468, 9479, 9490, 9500, 9510, 9521, 9531, 9541, 9551, 9561, 9570, 9580, 9590, 9599,
+ 9608, 9617, 9627, 9636, 9645, 9653, 9662, 9671, 9679, 9688, 9696, 9705, 9713, 9721, 9729, 9737,
+ 9745, 9753, 9761, 9769, 9777, 9784, 9792, 9799, 9807, 9814, 9821, 9829, 9836, 9843, 9850, 9857],
+ [9864, 9878, 9892, 9905, 9918, 9931, 9944, 9956, 9969, 9981, 9993, 10005, 10017, 10029, 10040, 10051,
+ 10063, 10074, 10085, 10095, 10106, 10117, 10127, 10137, 10147, 10157, 10167, 10177, 10187, 10197, 10206, 10215,
+ 10225, 10234, 10243, 10252, 10261, 10270, 10279, 10287, 10296, 10304, 10313, 10321, 10330, 10338, 10346, 10354,
+ 10362, 10370, 10378, 10385, 10393, 10401, 10408, 10416, 10423, 10431, 10438, 10445, 10452, 10460, 10467, 10474],
+ [10481, 10494, 10508, 10521, 10535, 10548, 10560, 10573, 10585, 10598, 10610, 10622, 10634, 10645, 10657, 10668,
+ 10679, 10690, 10701, 10712, 10723, 10733, 10743, 10754, 10764, 10774, 10784, 10794, 10803, 10813, 10823, 10832,
+ 10841, 10851, 10860, 10869, 10878, 10886, 10895, 10904, 10912, 10921, 10929, 10938, 10946, 10954, 10962, 10970,
+ 10978, 10986, 10994, 11002, 11010, 11017, 11025, 11032, 11040, 11047, 11054, 11062, 11069, 11076, 11083, 11090],
+ [11097, 11111, 11125, 11138, 11151, 11164, 11177, 11189, 11202, 11214, 11226, 11238, 11250, 11262, 11273, 11284,
+ 11296, 11307, 11318, 11328, 11339, 11350, 11360, 11370, 11380, 11390, 11400, 11410, 11420, 11430, 11439, 11448,
+ 11458, 11467, 11476, 11485, 11494, 11503, 11512, 11520, 11529, 11538, 11546, 11554, 11563, 11571, 11579, 11587,
+ 11595, 11603, 11611, 11618, 11626, 11634, 11641, 11649, 11656, 11664, 11671, 11678, 11685, 11693, 11700, 11707],
+ [11714, 11727, 11741, 11754, 11768, 11781, 11793, 11806, 11818, 11831, 11843, 11855, 11867, 11878, 11890, 11901,
+ 11912, 11923, 11934, 11945, 11956, 11966, 11976, 11987, 11997, 12007, 12017, 12027, 12036, 12046, 12056, 12065,
+ 12074, 12084, 12093, 12102, 12111, 12119, 12128, 12137, 12146, 12154, 12162, 12171, 12179, 12187, 12195, 12203,
+ 12211, 12219, 12227, 12235, 12243, 12250, 12258, 12265, 12273, 12280, 12287, 12295, 12302, 12309, 12316, 12323],
+ [12330, 12344, 12358, 12371, 12384, 12397, 12410, 12423, 12435, 12447, 12459, 12471, 12483, 12495, 12506, 12517,
+ 12529, 12540, 12551, 12561, 12572, 12583, 12593, 12603, 12613, 12623, 12633, 12643, 12653, 12663, 12672, 12682,
+ 12691, 12700, 12709, 12718, 12727, 12736, 12745, 12753, 12762, 12771, 12779, 12787, 12796, 12804, 12812, 12820,
+ 12828, 12836, 12844, 12851, 12859, 12867, 12874, 12882, 12889, 12897, 12904, 12911, 12918, 12926, 12933, 12940],
+ [12947, 12960, 12974, 12987, 13001, 13014, 13026, 13039, 13051, 13064, 13076, 13088, 13100, 13111, 13123, 13134,
+ 13145, 13156, 13167, 13178, 13189, 13199, 13209, 13220, 13230, 13240, 13250, 13260, 13269, 13279, 13289, 13298,
+ 13307, 13317, 13326, 13335, 13344, 13352, 13361, 13370, 13379, 13387, 13395, 13404, 13412, 13420, 13428, 13436,
+ 13444, 13452, 13460, 13468, 13476, 13483, 13491, 13498, 13506, 13513, 13521, 13528, 13535, 13542, 13549, 13556],
+ [13563, 13577, 13591, 13604, 13617, 13630, 13643, 13656, 13668, 13680, 13692, 13704, 13716, 13728, 13739, 13750,
+ 13762, 13773, 13784, 13794, 13805, 13816, 13826, 13836, 13846, 13857, 13866, 13876, 13886, 13896, 13905, 13915,
+ 13924, 13933, 13942, 13951, 13960, 13969, 13978, 13986, 13995, 14004, 14012, 14020, 14029, 14037, 14045, 14053,
+ 14061, 14069, 14077, 14084, 14092, 14100, 14107, 14115, 14122, 14130, 14137, 14144, 14151, 14159, 14166, 14173],
+ [14180, 14194, 14207, 14220, 14234, 14247, 14259, 14272, 14284, 14297, 14309, 14321, 14333, 14344, 14356, 14367,
+ 14378, 14389, 14400, 14411, 14422, 14432, 14443, 14453, 14463, 14473, 14483, 14493, 14502, 14512, 14522, 14531,
+ 14540, 14550, 14559, 14568, 14577, 14586, 14594, 14603, 14612, 14620, 14628, 14637, 14645, 14653, 14661, 14669,
+ 14677, 14685, 14693, 14701, 14709, 14716, 14724, 14731, 14739, 14746, 14754, 14761, 14768, 14775, 14782, 14789],
+ [14796, 14810, 14824, 14837, 14850, 14863, 14876, 14889, 14901, 14913, 14925, 14937, 14949, 14961, 14972, 14984,
+ 14995, 15006, 15017, 15027, 15038, 15049, 15059, 15069, 15079, 15090, 15099, 15109, 15119, 15129, 15138, 15148,
+ 15157, 15166, 15175, 15184, 15193, 15202, 15211, 15219, 15228, 15237, 15245, 15253, 15262, 15270, 15278, 15286,
+ 15294, 15302, 15310, 15317, 15325, 15333, 15340, 15348, 15355, 15363, 15370, 15377, 15384, 15392, 15399, 15406],
+ [15413, 15427, 15440, 15453, 15467, 15480, 15492, 15505, 15517, 15530, 15542, 15554, 15566, 15577, 15589, 15600,
+ 15611, 15622, 15633, 15644, 15655, 15665, 15676, 15686, 15696, 15706, 15716, 15726, 15736, 15745, 15755, 15764,
+ 15773, 15783, 15792, 15801, 15810, 15819, 15827, 15836, 15845, 15853, 15862, 15870, 15878, 15886, 15894, 15903,
+ 15910, 15918, 15926, 15934, 15942, 15949, 15957, 15964, 15972, 15979, 15987, 15994, 16001, 16008, 16015, 16022],
+ [16029, 16043, 16057, 16070, 16083, 16096, 16109, 16122, 16134, 16146, 16158, 16170, 16182, 16194, 16205, 16217,
+ 16228, 16239, 16250, 16260, 16271, 16282, 16292, 16302, 16312, 16323, 16332, 16342, 16352, 16362, 16371, 16381,
+ 16390, 16399, 16408, 16417, 16426, 16435, 16444, 16452, 16461, 16470, 16478, 16486, 16495, 16503, 16511, 16519,
+ 16527, 16535, 16543, 16550, 16558, 16566, 16573, 16581, 16588, 16596, 16603, 16610, 16618, 16625, 16632, 16639],
+ [16646, 16660, 16673, 16686, 16700, 16713, 16725, 16738, 16751, 16763, 16775, 16787, 16799, 16810, 16822, 16833,
+ 16844, 16855, 16866, 16877, 16888, 16898, 16909, 16919, 16929, 16939, 16949, 16959, 16969, 16978, 16988, 16997,
+ 17006, 17016, 17025, 17034, 17043, 17052, 17060, 17069, 17078, 17086, 17095, 17103, 17111, 17119, 17127, 17136,
+ 17143, 17151, 17159, 17167, 17175, 17182, 17190, 17197, 17205, 17212, 17220, 17227, 17234, 17241, 17248, 17255],
+ [17262, 17276, 17290, 17303, 17316, 17329, 17342, 17355, 17367, 17379, 17391, 17403, 17415, 17427, 17438, 17450,
+ 17461, 17472, 17483, 17493, 17504, 17515, 17525, 17535, 17546, 17556, 17565, 17575, 17585, 17595, 17604, 17614,
+ 17623, 17632, 17641, 17650, 17659, 17668, 17677, 17685, 17694, 17703, 17711, 17719, 17728, 17736, 17744, 17752,
+ 17760, 17768, 17776, 17784, 17791, 17799, 17806, 17814, 17821, 17829, 17836, 17843, 17851, 17858, 17865, 17872],
+ [17879, 17893, 17906, 17920, 17933, 17946, 17958, 17971, 17984, 17996, 18008, 18020, 18032, 18043, 18055, 18066,
+ 18077, 18088, 18099, 18110, 18121, 18131, 18142, 18152, 18162, 18172, 18182, 18192, 18202, 18211, 18221, 18230,
+ 18239, 18249, 18258, 18267, 18276, 18285, 18293, 18302, 18311, 18319, 18328, 18336, 18344, 18352, 18360, 18369,
+ 18377, 18384, 18392, 18400, 18408, 18415, 18423, 18430, 18438, 18445, 18453, 18460, 18467, 18474, 18481, 18488],
+ [18495, 18509, 18523, 18536, 18549, 18562, 18575, 18588, 18600, 18612, 18624, 18636, 18648, 18660, 18671, 18683,
+ 18694, 18705, 18716, 18726, 18737, 18748, 18758, 18768, 18779, 18789, 18799, 18808, 18818, 18828, 18837, 18847,
+ 18856, 18865, 18874, 18883, 18892, 18901, 18910, 18919, 18927, 18936, 18944, 18952, 18961, 18969, 18977, 18985,
+ 18993, 19001, 19009, 19017, 19024, 19032, 19039, 19047, 19054, 19062, 19069, 19076, 19084, 19091, 19098, 19105],
+ [19112, 19126, 19139, 19153, 19166, 19179, 19191, 19204, 19217, 19229, 19241, 19253, 19265, 19276, 19288, 19299,
+ 19310, 19321, 19332, 19343, 19354, 19364, 19375, 19385, 19395, 19405, 19415, 19425, 19435, 19444, 19454, 19463,
+ 19472, 19482, 19491, 19500, 19509, 19518, 19526, 19535, 19544, 19552, 19561, 19569, 19577, 19585, 19594, 19602,
+ 19610, 19617, 19625, 19633, 19641, 19648, 19656, 19663, 19671, 19678, 19686, 19693, 19700, 19707, 19714, 19721],
+ [19728, 19742, 19756, 19769, 19782, 19795, 19808, 19821, 19833, 19845, 19857, 19869, 19881, 19893, 19904, 19916,
+ 19927, 19938, 19949, 19960, 19970, 19981, 19991, 20001, 20012, 20022, 20032, 20041, 20051, 20061, 20070, 20080,
+ 20089, 20098, 20107, 20116, 20125, 20134, 20143, 20152, 20160, 20169, 20177, 20185, 20194, 20202, 20210, 20218,
+ 20226, 20234, 20242, 20250, 20257, 20265, 20272, 20280, 20287, 20295, 20302, 20309, 20317, 20324, 20331, 20338],
+ [20345, 20359, 20372, 20386, 20399, 20412, 20425, 20437, 20450, 20462, 20474, 20486, 20498, 20509, 20521, 20532,
+ 20543, 20554, 20565, 20576, 20587, 20597, 20608, 20618, 20628, 20638, 20648, 20658, 20668, 20677, 20687, 20696,
+ 20705, 20715, 20724, 20733, 20742, 20751, 20759, 20768, 20777, 20785, 20794, 20802, 20810, 20818, 20827, 20835,
+ 20843, 20850, 20858, 20866, 20874, 20881, 20889, 20896, 20904, 20911, 20919, 20926, 20933, 20940, 20947, 20954],
+ [20961, 20975, 20989, 21002, 21015, 21028, 21041, 21054, 21066, 21078, 21090, 21102, 21114, 21126, 21137, 21149,
+ 21160, 21171, 21182, 21193, 21203, 21214, 21224, 21234, 21245, 21255, 21265, 21274, 21284, 21294, 21303, 21313,
+ 21322, 21331, 21340, 21349, 21358, 21367, 21376, 21385, 21393, 21402, 21410, 21418, 21427, 21435, 21443, 21451,
+ 21459, 21467, 21475, 21483, 21490, 21498, 21505, 21513, 21520, 21528, 21535, 21542, 21550, 21557, 21564, 21571],
+ [21578, 21592, 21605, 21619, 21632, 21645, 21658, 21670, 21683, 21695, 21707, 21719, 21731, 21742, 21754, 21765,
+ 21776, 21787, 21798, 21809, 21820, 21830, 21841, 21851, 21861, 21871, 21881, 21891, 21901, 21910, 21920, 21929,
+ 21938, 21948, 21957, 21966, 21975, 21984, 21992, 22001, 22010, 22018, 22027, 22035, 22043, 22051, 22060, 22068,
+ 22076, 22083, 22091, 22099, 22107, 22114, 22122, 22129, 22137, 22144, 22152, 22159, 22166, 22173, 22180, 22187],
+ [22194, 22208, 22222, 22235, 22248, 22261, 22274, 22287, 22299, 22311, 22323, 22335, 22347, 22359, 22370, 22382,
+ 22393, 22404, 22415, 22426, 22436, 22447, 22457, 22467, 22478, 22488, 22498, 22507, 22517, 22527, 22536, 22546,
+ 22555, 22564, 22573, 22582, 22591, 22600, 22609, 22618, 22626, 22635, 22643, 22651, 22660, 22668, 22676, 22684,
+ 22692, 22700, 22708, 22716, 22723, 22731, 22738, 22746, 22753, 22761, 22768, 22775, 22783, 22790, 22797, 22804],
+ [22811, 22825, 22838, 22852, 22865, 22878, 22891, 22903, 22916, 22928, 22940, 22952, 22964, 22975, 22987, 22998,
+ 23009, 23020, 23031, 23042, 23053, 23063, 23074, 23084, 23094, 23104, 23114, 23124, 23134, 23143, 23153, 23162,
+ 23171, 23181, 23190, 23199, 23208, 23217, 23225, 23234, 23243, 23251, 23260, 23268, 23276, 23284, 23293, 23301,
+ 23309, 23316, 23324, 23332, 23340, 23347, 23355, 23363, 23370, 23377, 23385, 23392, 23399, 23406, 23413, 23420],
+ [23427, 23441, 23455, 23468, 23481, 23494, 23507, 23520, 23532, 23544, 23556, 23568, 23580, 23592, 23603, 23615,
+ 23626, 23637, 23648, 23659, 23669, 23680, 23690, 23700, 23711, 23721, 23731, 23740, 23750, 23760, 23769, 23779,
+ 23788, 23797, 23806, 23815, 23824, 23833, 23842, 23851, 23859, 23868, 23876, 23884, 23893, 23901, 23909, 23917,
+ 23925, 23933, 23941, 23949, 23956, 23964, 23972, 23979, 23986, 23994, 24001, 24008, 24016, 24023, 24030, 24037],
+ [24044, 24058, 24071, 24085, 24098, 24111, 24124, 24136, 24149, 24161, 24173, 24185, 24197, 24208, 24220, 24231,
+ 24242, 24253, 24264, 24275, 24286, 24296, 24307, 24317, 24327, 24337, 24347, 24357, 24367, 24376, 24386, 24395,
+ 24405, 24414, 24423, 24432, 24441, 24450, 24458, 24467, 24476, 24484, 24493, 24501, 24509, 24517, 24526, 24534,
+ 24542, 24550, 24557, 24565, 24573, 24580, 24588, 24596, 24603, 24610, 24618, 24625, 24632, 24639, 24646, 24653],
+ [24660, 24674, 24688, 24701, 24714, 24727, 24740, 24753, 24765, 24777, 24790, 24801, 24813, 24825, 24836, 24848,
+ 24859, 24870, 24881, 24892, 24902, 24913, 24923, 24933, 24944, 24954, 24964, 24973, 24983, 24993, 25002, 25012,
+ 25021, 25030, 25039, 25048, 25057, 25066, 25075, 25084, 25092, 25101, 25109, 25117, 25126, 25134, 25142, 25150,
+ 25158, 25166, 25174, 25182, 25189, 25197, 25205, 25212, 25219, 25227, 25234, 25241, 25249, 25256, 25263, 25270],
+ [25277, 25291, 25304, 25318, 25331, 25344, 25357, 25369, 25382, 25394, 25406, 25418, 25430, 25441, 25453, 25464,
+ 25475, 25486, 25497, 25508, 25519, 25529, 25540, 25550, 25560, 25570, 25580, 25590, 25600, 25609, 25619, 25628,
+ 25638, 25647, 25656, 25665, 25674, 25683, 25691, 25700, 25709, 25717, 25726, 25734, 25742, 25750, 25759, 25767,
+ 25775, 25783, 25790, 25798, 25806, 25813, 25821, 25829, 25836, 25843, 25851, 25858, 25865, 25872, 25879, 25886],
+ [25893, 25907, 25921, 25934, 25947, 25960, 25973, 25986, 25998, 26010, 26023, 26034, 26046, 26058, 26069, 26081,
+ 26092, 26103, 26114, 26125, 26135, 26146, 26156, 26166, 26177, 26187, 26197, 26206, 26216, 26226, 26235, 26245,
+ 26254, 26263, 26272, 26281, 26290, 26299, 26308, 26317, 26325, 26334, 26342, 26351, 26359, 26367, 26375, 26383,
+ 26391, 26399, 26407, 26415, 26422, 26430, 26438, 26445, 26453, 26460, 26467, 26474, 26482, 26489, 26496, 26503],
+ [26510, 26524, 26537, 26551, 26564, 26577, 26590, 26602, 26615, 26627, 26639, 26651, 26663, 26674, 26686, 26697,
+ 26708, 26719, 26730, 26741, 26752, 26762, 26773, 26783, 26793, 26803, 26813, 26823, 26833, 26842, 26852, 26861,
+ 26871, 26880, 26889, 26898, 26907, 26916, 26924, 26933, 26942, 26950, 26959, 26967, 26975, 26983, 26992, 27000,
+ 27008, 27016, 27023, 27031, 27039, 27046, 27054, 27062, 27069, 27076, 27084, 27091, 27098, 27105, 27112, 27119],
+ [27126, 27140, 27154, 27167, 27180, 27193, 27206, 27219, 27231, 27243, 27256, 27267, 27279, 27291, 27302, 27314,
+ 27325, 27336, 27347, 27358, 27368, 27379, 27389, 27399, 27410, 27420, 27430, 27439, 27449, 27459, 27468, 27478,
+ 27487, 27496, 27505, 27514, 27523, 27532, 27541, 27550, 27558, 27567, 27575, 27584, 27592, 27600, 27608, 27616,
+ 27624, 27632, 27640, 27648, 27655, 27663, 27671, 27678, 27686, 27693, 27700, 27707, 27715, 27722, 27729, 27736],
+ [27743, 27757, 27770, 27784, 27797, 27810, 27823, 27835, 27848, 27860, 27872, 27884, 27896, 27907, 27919, 27930,
+ 27941, 27952, 27963, 27974, 27985, 27995, 28006, 28016, 28026, 28036, 28046, 28056, 28066, 28075, 28085, 28094,
+ 28104, 28113, 28122, 28131, 28140, 28149, 28157, 28166, 28175, 28183, 28192, 28200, 28208, 28217, 28225, 28233,
+ 28241, 28249, 28256, 28264, 28272, 28280, 28287, 28295, 28302, 28309, 28317, 28324, 28331, 28338, 28345, 28352],
+ [28359, 28373, 28387, 28400, 28413, 28426, 28439, 28452, 28464, 28476, 28489, 28501, 28512, 28524, 28535, 28547,
+ 28558, 28569, 28580, 28591, 28601, 28612, 28622, 28633, 28643, 28653, 28663, 28672, 28682, 28692, 28701, 28711,
+ 28720, 28729, 28738, 28747, 28756, 28765, 28774, 28783, 28791, 28800, 28808, 28817, 28825, 28833, 28841, 28849,
+ 28857, 28865, 28873, 28881, 28888, 28896, 28904, 28911, 28919, 28926, 28933, 28941, 28948, 28955, 28962, 28969],
+ [28976, 28990, 29003, 29017, 29030, 29043, 29056, 29068, 29081, 29093, 29105, 29117, 29129, 29140, 29152, 29163,
+ 29174, 29185, 29196, 29207, 29218, 29228, 29239, 29249, 29259, 29269, 29279, 29289, 29299, 29308, 29318, 29327,
+ 29337, 29346, 29355, 29364, 29373, 29382, 29390, 29399, 29408, 29416, 29425, 29433, 29441, 29450, 29458, 29466,
+ 29474, 29482, 29489, 29497, 29505, 29513, 29520, 29528, 29535, 29542, 29550, 29557, 29564, 29571, 29578, 29585],
+ [29592, 29606, 29620, 29633, 29646, 29659, 29672, 29685, 29697, 29709, 29722, 29734, 29745, 29757, 29768, 29780,
+ 29791, 29802, 29813, 29824, 29834, 29845, 29855, 29866, 29876, 29886, 29896, 29906, 29915, 29925, 29934, 29944,
+ 29953, 29962, 29971, 29980, 29989, 29998, 30007, 30016, 30024, 30033, 30041, 30050, 30058, 30066, 30074, 30082,
+ 30090, 30098, 30106, 30114, 30121, 30129, 30137, 30144, 30152, 30159, 30166, 30174, 30181, 30188, 30195, 30202],
+ [30209, 30223, 30236, 30250, 30263, 30276, 30289, 30301, 30314, 30326, 30338, 30350, 30362, 30373, 30385, 30396,
+ 30407, 30418, 30429, 30440, 30451, 30461, 30472, 30482, 30492, 30502, 30512, 30522, 30532, 30541, 30551, 30560,
+ 30570, 30579, 30588, 30597, 30606, 30615, 30624, 30632, 30641, 30649, 30658, 30666, 30674, 30683, 30691, 30699,
+ 30707, 30715, 30722, 30730, 30738, 30746, 30753, 30761, 30768, 30775, 30783, 30790, 30797, 30804, 30811, 30818],
+ [30825, 30839, 30853, 30866, 30879, 30892, 30905, 30918, 30930, 30943, 30955, 30967, 30978, 30990, 31001, 31013,
+ 31024, 31035, 31046, 31057, 31067, 31078, 31088, 31099, 31109, 31119, 31129, 31139, 31148, 31158, 31167, 31177,
+ 31186, 31195, 31204, 31213, 31222, 31231, 31240, 31249, 31257, 31266, 31274, 31283, 31291, 31299, 31307, 31315,
+ 31323, 31331, 31339, 31347, 31354, 31362, 31370, 31377, 31385, 31392, 31399, 31407, 31414, 31421, 31428, 31435],
+ [31442, 31456, 31469, 31483, 31496, 31509, 31522, 31534, 31547, 31559, 31571, 31583, 31595, 31606, 31618, 31629,
+ 31640, 31652, 31662, 31673, 31684, 31694, 31705, 31715, 31725, 31735, 31745, 31755, 31765, 31774, 31784, 31793,
+ 31803, 31812, 31821, 31830, 31839, 31848, 31857, 31865, 31874, 31882, 31891, 31899, 31907, 31916, 31924, 31932,
+ 31940, 31948, 31955, 31963, 31971, 31979, 31986, 31994, 32001, 32008, 32016, 32023, 32030, 32037, 32044, 32052],
+ [32058, 32072, 32086, 32099, 32112, 32125, 32138, 32151, 32163, 32176, 32188, 32200, 32211, 32223, 32234, 32246,
+ 32257, 32268, 32279, 32290, 32300, 32311, 32321, 32332, 32342, 32352, 32362, 32372, 32381, 32391, 32400, 32410,
+ 32419, 32428, 32437, 32446, 32455, 32464, 32473, 32482, 32490, 32499, 32507, 32516, 32524, 32532, 32540, 32548,
+ 32556, 32564, 32572, 32580, 32587, 32595, 32603, 32610, 32618, 32625, 32632, 32640, 32647, 32654, 32661, 32668],
+ [32675, 32689, 32702, 32716, 32729, 32742, 32755, 32767, 32780, 32792, 32804, 32816, 32828, 32839, 32851, 32862,
+ 32873, 32885, 32895, 32906, 32917, 32927, 32938, 32948, 32958, 32968, 32978, 32988, 32998, 33007, 33017, 33026,
+ 33036, 33045, 33054, 33063, 33072, 33081, 33090, 33098, 33107, 33115, 33124, 33132, 33140, 33149, 33157, 33165,
+ 33173, 33181, 33188, 33196, 33204, 33212, 33219, 33227, 33234, 33241, 33249, 33256, 33263, 33270, 33278, 33285],
+ [33292, 33305, 33319, 33332, 33345, 33358, 33371, 33384, 33396, 33409, 33421, 33433, 33444, 33456, 33467, 33479,
+ 33490, 33501, 33512, 33523, 33533, 33544, 33554, 33565, 33575, 33585, 33595, 33605, 33614, 33624, 33633, 33643,
+ 33652, 33661, 33670, 33680, 33688, 33697, 33706, 33715, 33723, 33732, 33740, 33749, 33757, 33765, 33773, 33781,
+ 33789, 33797, 33805, 33813, 33820, 33828, 33836, 33843, 33851, 33858, 33865, 33873, 33880, 33887, 33894, 33901],
+ [33908, 33922, 33935, 33949, 33962, 33975, 33988, 34000, 34013, 34025, 34037, 34049, 34061, 34072, 34084, 34095,
+ 34106, 34118, 34128, 34139, 34150, 34160, 34171, 34181, 34191, 34201, 34211, 34221, 34231, 34240, 34250, 34259,
+ 34269, 34278, 34287, 34296, 34305, 34314, 34323, 34331, 34340, 34348, 34357, 34365, 34373, 34382, 34390, 34398,
+ 34406, 34414, 34422, 34429, 34437, 34445, 34452, 34460, 34467, 34475, 34482, 34489, 34496, 34503, 34511, 34518],
+ [34525, 34538, 34552, 34565, 34578, 34591, 34604, 34617, 34629, 34642, 34654, 34666, 34677, 34689, 34700, 34712,
+ 34723, 34734, 34745, 34756, 34766, 34777, 34787, 34798, 34808, 34818, 34828, 34838, 34847, 34857, 34866, 34876,
+ 34885, 34894, 34904, 34913, 34921, 34930, 34939, 34948, 34956, 34965, 34973, 34982, 34990, 34998, 35006, 35014,
+ 35022, 35030, 35038, 35046, 35053, 35061, 35069, 35076, 35084, 35091, 35098, 35106, 35113, 35120, 35127, 35134],
+ [35141, 35155, 35168, 35182, 35195, 35208, 35221, 35233, 35246, 35258, 35270, 35282, 35294, 35306, 35317, 35328,
+ 35340, 35351, 35361, 35372, 35383, 35393, 35404, 35414, 35424, 35434, 35444, 35454, 35464, 35473, 35483, 35492,
+ 35502, 35511, 35520, 35529, 35538, 35547, 35556, 35564, 35573, 35581, 35590, 35598, 35606, 35615, 35623, 35631,
+ 35639, 35647, 35655, 35662, 35670, 35678, 35685, 35693, 35700, 35708, 35715, 35722, 35729, 35736, 35744, 35751],
+ [35758, 35771, 35785, 35798, 35811, 35824, 35837, 35850, 35862, 35875, 35887, 35899, 35910, 35922, 35934, 35945,
+ 35956, 35967, 35978, 35989, 35999, 36010, 36020, 36031, 36041, 36051, 36061, 36071, 36080, 36090, 36099, 36109,
+ 36118, 36127, 36137, 36146, 36154, 36163, 36172, 36181, 36189, 36198, 36206, 36215, 36223, 36231, 36239, 36247,
+ 36255, 36263, 36271, 36279, 36287, 36294, 36302, 36309, 36317, 36324, 36331, 36339, 36346, 36353, 36360, 36367],
+ [36374, 36388, 36401, 36415, 36428, 36441, 36454, 36466, 36479, 36491, 36503, 36515, 36527, 36539, 36550, 36561,
+ 36573, 36584, 36594, 36605, 36616, 36626, 36637, 36647, 36657, 36667, 36677, 36687, 36697, 36706, 36716, 36725,
+ 36735, 36744, 36753, 36762, 36771, 36780, 36789, 36797, 36806, 36814, 36823, 36831, 36839, 36848, 36856, 36864,
+ 36872, 36880, 36888, 36895, 36903, 36911, 36918, 36926, 36933, 36941, 36948, 36955, 36962, 36969, 36977, 36984],
+ [36991, 37004, 37018, 37031, 37044, 37057, 37070, 37083, 37095, 37108, 37120, 37132, 37143, 37155, 37167, 37178,
+ 37189, 37200, 37211, 37222, 37232, 37243, 37253, 37264, 37274, 37284, 37294, 37304, 37313, 37323, 37332, 37342,
+ 37351, 37360, 37370, 37379, 37388, 37396, 37405, 37414, 37422, 37431, 37439, 37448, 37456, 37464, 37472, 37480,
+ 37488, 37496, 37504, 37512, 37520, 37527, 37535, 37542, 37550, 37557, 37564, 37572, 37579, 37586, 37593, 37600],
+ [37607, 37621, 37634, 37648, 37661, 37674, 37687, 37699, 37712, 37724, 37736, 37748, 37760, 37772, 37783, 37794,
+ 37806, 37817, 37828, 37838, 37849, 37859, 37870, 37880, 37890, 37900, 37910, 37920, 37930, 37939, 37949, 37958,
+ 37968, 37977, 37986, 37995, 38004, 38013, 38022, 38030, 38039, 38047, 38056, 38064, 38072, 38081, 38089, 38097,
+ 38105, 38113, 38121, 38128, 38136, 38144, 38151, 38159, 38166, 38174, 38181, 38188, 38195, 38202, 38210, 38217],
+ [38224, 38237, 38251, 38264, 38278, 38290, 38303, 38316, 38328, 38341, 38353, 38365, 38376, 38388, 38400, 38411,
+ 38422, 38433, 38444, 38455, 38465, 38476, 38486, 38497, 38507, 38517, 38527, 38537, 38546, 38556, 38565, 38575,
+ 38584, 38593, 38603, 38612, 38621, 38629, 38638, 38647, 38655, 38664, 38672, 38681, 38689, 38697, 38705, 38713,
+ 38721, 38729, 38737, 38745, 38753, 38760, 38768, 38775, 38783, 38790, 38797, 38805, 38812, 38819, 38826, 38833],
+ [38840, 38854, 38867, 38881, 38894, 38907, 38920, 38932, 38945, 38957, 38969, 38981, 38993, 39005, 39016, 39027,
+ 39039, 39050, 39061, 39071, 39082, 39092, 39103, 39113, 39123, 39133, 39143, 39153, 39163, 39172, 39182, 39191,
+ 39201, 39210, 39219, 39228, 39237, 39246, 39255, 39263, 39272, 39280, 39289, 39297, 39305, 39314, 39322, 39330,
+ 39338, 39346, 39354, 39361, 39369, 39377, 39384, 39392, 39399, 39407, 39414, 39421, 39428, 39436, 39443, 39450],
+];
+
+/// Approximate `log10(numerator / denominator) * 2048` using a look-up table.
+#[inline]
+pub fn negative_log10_times_2048(numerator: u64, denominator: u64) -> u64 {
+ // Multiply the -1 through to avoid needing to use signed numbers.
+ (log10_times_2048(denominator) - log10_times_2048(numerator)) as u64
+}
+
+#[inline]
+fn log10_times_2048(x: u64) -> u16 {
+ debug_assert_ne!(x, 0);
+ let most_significant_bit = HIGHEST_BIT - x.leading_zeros();
+ let lower_bits = (x >> most_significant_bit.saturating_sub(LOWER_BITS)) & LOWER_BITMASK;
+ LOG10_TIMES_2048[most_significant_bit as usize][lower_bits as usize]
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+
+ #[test]
+ fn prints_negative_log10_times_2048_lookup_table() {
+ for msb in 0..BITS {
+ for i in 0..LOWER_BITS_BOUND {
+ let x = ((LOWER_BITS_BOUND + i) << (HIGHEST_BIT - LOWER_BITS)) >> (HIGHEST_BIT - msb);
+ let log10_times_2048 = ((x as f64).log10() * 2048.0).round() as u16;
+ assert_eq!(log10_times_2048, LOG10_TIMES_2048[msb as usize][i as usize]);
+
+ if i % LOWER_BITS_BOUND == 0 {
+ print!("\t\t[{}, ", log10_times_2048);
+ } else if i % LOWER_BITS_BOUND == LOWER_BITS_BOUND - 1 {
+ println!("{}],", log10_times_2048);
+ } else if i % (LOWER_BITS_BOUND/4) == LOWER_BITS_BOUND/4 - 1 {
+ print!("{},\n\t\t\t", log10_times_2048);
+ } else {
+ print!("{}, ", log10_times_2048);
+ }
+ }
+ }
+ }
+}
+
use crate::ln::msgs::DecodeError;
use crate::routing::gossip::{EffectiveCapacity, NetworkGraph, NodeId};
use crate::routing::router::{Path, CandidateRouteHop, PublicHopCandidate};
+use crate::routing::log_approx;
use crate::util::ser::{Readable, ReadableArgs, Writeable, Writer};
use crate::util::logger::Logger;
/// The rough cutoff at which our precision falls off and we should stop bothering to try to log a
/// ratio, as X in 1/X.
-const PRECISION_LOWER_BOUND_DENOMINATOR: u64 = approx::LOWER_BITS_BOUND;
+const PRECISION_LOWER_BOUND_DENOMINATOR: u64 = log_approx::LOWER_BITS_BOUND;
/// The divisor used when computing the amount penalty.
const AMOUNT_PENALTY_DIVISOR: u64 = 1 << 20;
0
} else {
let negative_log10_times_2048 =
- approx::negative_log10_times_2048(numerator, denominator);
+ log_approx::negative_log10_times_2048(numerator, denominator);
Self::combined_penalty_msat(amount_msat, negative_log10_times_2048,
score_params.liquidity_penalty_multiplier_msat,
score_params.liquidity_penalty_amount_multiplier_msat)
.calculate_success_probability_times_billion(
score_params, amount_msat, self.capacity_msat)
{
- let historical_negative_log10_times_2048 = approx::negative_log10_times_2048(cumulative_success_prob_times_billion + 1, 1024 * 1024 * 1024);
+ let historical_negative_log10_times_2048 =
+ log_approx::negative_log10_times_2048(cumulative_success_prob_times_billion + 1, 1024 * 1024 * 1024);
res = res.saturating_add(Self::combined_penalty_msat(amount_msat,
historical_negative_log10_times_2048, score_params.historical_liquidity_penalty_multiplier_msat,
score_params.historical_liquidity_penalty_amount_multiplier_msat));
let (numerator, denominator) = success_probability(amount_msat, 0,
available_capacity, available_capacity, score_params, true);
let negative_log10_times_2048 =
- approx::negative_log10_times_2048(numerator, denominator);
+ log_approx::negative_log10_times_2048(numerator, denominator);
res = res.saturating_add(Self::combined_penalty_msat(amount_msat, negative_log10_times_2048,
score_params.historical_liquidity_penalty_multiplier_msat,
score_params.historical_liquidity_penalty_amount_multiplier_msat));
libm::powf(n as f32, exp as f32) as f64
}
-mod approx {
- const BITS: u32 = 64;
- const HIGHEST_BIT: u32 = BITS - 1;
- const LOWER_BITS: u32 = 6;
- pub(super) const LOWER_BITS_BOUND: u64 = 1 << LOWER_BITS;
- const LOWER_BITMASK: u64 = (1 << LOWER_BITS) - 1;
-
- /// Look-up table for `log10(x) * 2048` where row `i` is used for each `x` having `i` as the
- /// most significant bit. The next 4 bits of `x`, if applicable, are used for the second index.
- const LOG10_TIMES_2048: [[u16; (LOWER_BITS_BOUND) as usize]; BITS as usize] = [
- [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
- [617, 617, 617, 617, 617, 617, 617, 617, 617, 617, 617, 617, 617, 617, 617, 617,
- 617, 617, 617, 617, 617, 617, 617, 617, 617, 617, 617, 617, 617, 617, 617, 617,
- 977, 977, 977, 977, 977, 977, 977, 977, 977, 977, 977, 977, 977, 977, 977, 977,
- 977, 977, 977, 977, 977, 977, 977, 977, 977, 977, 977, 977, 977, 977, 977, 977],
- [1233, 1233, 1233, 1233, 1233, 1233, 1233, 1233, 1233, 1233, 1233, 1233, 1233, 1233, 1233, 1233,
- 1431, 1431, 1431, 1431, 1431, 1431, 1431, 1431, 1431, 1431, 1431, 1431, 1431, 1431, 1431, 1431,
- 1594, 1594, 1594, 1594, 1594, 1594, 1594, 1594, 1594, 1594, 1594, 1594, 1594, 1594, 1594, 1594,
- 1731, 1731, 1731, 1731, 1731, 1731, 1731, 1731, 1731, 1731, 1731, 1731, 1731, 1731, 1731, 1731],
- [1850, 1850, 1850, 1850, 1850, 1850, 1850, 1850, 1954, 1954, 1954, 1954, 1954, 1954, 1954, 1954,
- 2048, 2048, 2048, 2048, 2048, 2048, 2048, 2048, 2133, 2133, 2133, 2133, 2133, 2133, 2133, 2133,
- 2210, 2210, 2210, 2210, 2210, 2210, 2210, 2210, 2281, 2281, 2281, 2281, 2281, 2281, 2281, 2281,
- 2347, 2347, 2347, 2347, 2347, 2347, 2347, 2347, 2409, 2409, 2409, 2409, 2409, 2409, 2409, 2409],
- [2466, 2466, 2466, 2466, 2520, 2520, 2520, 2520, 2571, 2571, 2571, 2571, 2619, 2619, 2619, 2619,
- 2665, 2665, 2665, 2665, 2708, 2708, 2708, 2708, 2749, 2749, 2749, 2749, 2789, 2789, 2789, 2789,
- 2827, 2827, 2827, 2827, 2863, 2863, 2863, 2863, 2898, 2898, 2898, 2898, 2931, 2931, 2931, 2931,
- 2964, 2964, 2964, 2964, 2995, 2995, 2995, 2995, 3025, 3025, 3025, 3025, 3054, 3054, 3054, 3054],
- [3083, 3083, 3110, 3110, 3136, 3136, 3162, 3162, 3187, 3187, 3212, 3212, 3235, 3235, 3259, 3259,
- 3281, 3281, 3303, 3303, 3324, 3324, 3345, 3345, 3366, 3366, 3386, 3386, 3405, 3405, 3424, 3424,
- 3443, 3443, 3462, 3462, 3479, 3479, 3497, 3497, 3514, 3514, 3531, 3531, 3548, 3548, 3564, 3564,
- 3580, 3580, 3596, 3596, 3612, 3612, 3627, 3627, 3642, 3642, 3656, 3656, 3671, 3671, 3685, 3685],
- [3699, 3713, 3726, 3740, 3753, 3766, 3779, 3791, 3804, 3816, 3828, 3840, 3852, 3864, 3875, 3886,
- 3898, 3909, 3919, 3930, 3941, 3951, 3962, 3972, 3982, 3992, 4002, 4012, 4022, 4031, 4041, 4050,
- 4060, 4069, 4078, 4087, 4096, 4105, 4114, 4122, 4131, 4139, 4148, 4156, 4164, 4173, 4181, 4189,
- 4197, 4205, 4213, 4220, 4228, 4236, 4243, 4251, 4258, 4266, 4273, 4280, 4287, 4294, 4302, 4309],
- [4316, 4329, 4343, 4356, 4369, 4382, 4395, 4408, 4420, 4433, 4445, 4457, 4468, 4480, 4492, 4503,
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- 39338, 39346, 39354, 39361, 39369, 39377, 39384, 39392, 39399, 39407, 39414, 39421, 39428, 39436, 39443, 39450],
- ];
-
- /// Approximate `log10(numerator / denominator) * 2048` using a look-up table.
- #[inline]
- pub fn negative_log10_times_2048(numerator: u64, denominator: u64) -> u64 {
- // Multiply the -1 through to avoid needing to use signed numbers.
- (log10_times_2048(denominator) - log10_times_2048(numerator)) as u64
- }
-
- #[inline]
- fn log10_times_2048(x: u64) -> u16 {
- debug_assert_ne!(x, 0);
- let most_significant_bit = HIGHEST_BIT - x.leading_zeros();
- let lower_bits = (x >> most_significant_bit.saturating_sub(LOWER_BITS)) & LOWER_BITMASK;
- LOG10_TIMES_2048[most_significant_bit as usize][lower_bits as usize]
- }
-
- #[cfg(test)]
- mod tests {
- use super::*;
-
- #[test]
- fn prints_negative_log10_times_2048_lookup_table() {
- for msb in 0..BITS {
- for i in 0..LOWER_BITS_BOUND {
- let x = ((LOWER_BITS_BOUND + i) << (HIGHEST_BIT - LOWER_BITS)) >> (HIGHEST_BIT - msb);
- let log10_times_2048 = ((x as f64).log10() * 2048.0).round() as u16;
- assert_eq!(log10_times_2048, LOG10_TIMES_2048[msb as usize][i as usize]);
-
- if i % LOWER_BITS_BOUND == 0 {
- print!("\t\t[{}, ", log10_times_2048);
- } else if i % LOWER_BITS_BOUND == LOWER_BITS_BOUND - 1 {
- println!("{}],", log10_times_2048);
- } else if i % (LOWER_BITS_BOUND/4) == LOWER_BITS_BOUND/4 - 1 {
- print!("{},\n\t\t\t", log10_times_2048);
- } else {
- print!("{}, ", log10_times_2048);
- }
- }
- }
- }
- }
-}
-
mod bucketed_history {
use super::*;
projects / rust-lightning / commitdiff