1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 24 */ 25 /* 26 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 27 * Use is subject to license terms. 28 */ 29 30 #include "libm_protos.h" 31 32 /* 33 * Let y[j] = _TBL_atan[2j], atan_y[j] = _TBL_atan[2j+1], j = 0, 1, ..., 95. 34 * {y[j], 0 <= j < 96} is a set of break points in (-1/8, 8) chosen so that 35 * the high part of y[j] is very close to 0x3fc08000 + (j << 16), 36 * and atan_y[j] = atan(y[j]) rounded has relative error bounded by 2^-60. 37 * 38 * -- K.C. Ng, 10/17/2004 39 */ 40 41 const double _TBL_atan[] = { 42 1.28906287871928065814e-01, 1.28199318484201185697e-01, 43 1.36718905591866640714e-01, 1.35876480966603985223e-01, 44 1.44531257606217988787e-01, 1.43537301152401930437e-01, 45 1.52343679482641575218e-01, 1.51181262880709432750e-01, 46 1.60156177403962790562e-01, 1.58807537535115006477e-01, 47 1.67968772982362929413e-01, 1.66415323534856884891e-01, 48 1.75781211596017922227e-01, 1.74003563682464612583e-01, 49 1.83593807762862160082e-01, 1.81571767039387044207e-01, 50 1.91406205589629646591e-01, 1.89118806085245338977e-01, 51 1.99218440148815872925e-01, 1.96643947167121080355e-01, 52 2.07031180070658488157e-01, 2.04147078126891479144e-01, 53 2.14843557086546094181e-01, 2.11626624363759674452e-01, 54 2.22656308649619494311e-01, 2.19082566659412503185e-01, 55 2.30468759807905931858e-01, 2.26513550670145669130e-01, 56 2.38281413377399470255e-01, 2.33919360814280885563e-01, 57 2.46093763828156536499e-01, 2.41298839969374956382e-01, 58 2.57812599322508773092e-01, 2.52318074018685223336e-01, 59 2.73437443946477509726e-01, 2.66912935433335718471e-01, 60 2.89062532292519769328e-01, 2.81392462451501401688e-01, 61 3.04687577351389293767e-01, 2.95751756530947318424e-01, 62 3.20312405527377053183e-01, 3.09986305565206343715e-01, 63 3.35937715576634265968e-01, 3.24092664204967739749e-01, 64 3.51562621385942464247e-01, 3.38066230870244233131e-01, 65 3.67187719833070636000e-01, 3.51904019130060419229e-01, 66 3.82812538440931826589e-01, 3.65602365234580339859e-01, 67 3.98437724467857745658e-01, 3.79158862748537828224e-01, 68 4.14062683287296784407e-01, 3.92570291474021892952e-01, 69 4.29687654458357937148e-01, 4.05834423459965343284e-01, 70 4.45312642848883721847e-01, 4.18949086342842669239e-01, 71 4.60937644536906665493e-01, 4.31912354681638355203e-01, 72 4.76563149131543906112e-01, 4.44722952952162131623e-01, 73 4.92187842452541601812e-01, 4.57378374341803173309e-01, 74 5.15624825518001039804e-01, 4.76069192487019954285e-01, 75 5.46874516057966109095e-01, 5.00440440618262982753e-01, 76 5.78125566624434150675e-01, 5.24180053466007933594e-01, 77 6.09375102172641347487e-01, 5.47284455493244337276e-01, 78 6.40624936950189516338e-01, 5.69756408779493739303e-01, 79 6.71875248719545625775e-01, 5.91599881698465779323e-01, 80 7.03124988865964306584e-01, 6.12820194714659649549e-01, 81 7.34376295967088421612e-01, 6.33426724884753156175e-01, 82 7.65624929092156736310e-01, 6.53426296477277901431e-01, 83 7.96874196003358736817e-01, 6.72832055855442590087e-01, 84 8.28125565205639735389e-01, 6.91656957129326954714e-01, 85 8.59375453355927021448e-01, 7.09911879233846576653e-01, 86 8.90625694745052709500e-01, 7.27611720056701827275e-01, 87 9.21875110259870345075e-01, 7.44770185320721367361e-01, 88 9.53125042657123722201e-01, 7.61402792157321428590e-01, 89 9.84374765277631902372e-01, 7.77524191164056688308e-01, 90 1.03126494373528343473e+00, 8.00788807142382097481e-01, 91 1.09374968909110092952e+00, 8.30144253291031475328e-01, 92 1.15625019152505204012e+00, 8.57735575892430546219e-01, 93 1.21874985186151341132e+00, 8.83672057048812575886e-01, 94 1.28124876006842702836e+00, 9.08066349515326720621e-01, 95 1.34375006271148444981e+00, 9.31026566320014126177e-01, 96 1.40627222899692072566e+00, 9.52659566341466756967e-01, 97 1.46874957658300542285e+00, 9.73037801091363618866e-01, 98 1.53124999999999555911e+00, 9.92272112377190040888e-01, 99 1.59375089676214143353e+00, 1.01043670320979472876e+00, 100 1.65624949800269094524e+00, 1.02760661639661776690e+00, 101 1.71874946971376685312e+00, 1.04385296549501305208e+00, 102 1.78125111924655166185e+00, 1.05924046784549474864e+00, 103 1.84374921332370989013e+00, 1.07382754310190620117e+00, 104 1.90625055239083862624e+00, 1.08767078118685489585e+00, 105 1.96874992734227549640e+00, 1.10081967347672460278e+00, 106 2.06250046973591683042e+00, 1.11934332464931074469e+00, 107 2.18749905173933534286e+00, 1.14201813543610697366e+00, 108 2.31249933788800232648e+00, 1.16264711873167669864e+00, 109 2.43749855191054187742e+00, 1.18147939634549814514e+00, 110 2.56251104936881235474e+00, 1.19873002825057639598e+00, 111 2.68750036758144528193e+00, 1.21457671610223272296e+00, 112 2.81249907059852954916e+00, 1.22918073183895870670e+00, 113 2.93749583903062294610e+00, 1.24267599964591468620e+00, 114 3.06250108260464948273e+00, 1.25518076906426045980e+00, 115 3.18750016629930410517e+00, 1.26679540235591403530e+00, 116 3.31250071362610132297e+00, 1.27760948984166233799e+00, 117 3.43749999999999333866e+00, 1.28770054149540058575e+00, 118 3.56249877589327157423e+00, 1.29713691630583838332e+00, 119 3.68750696071718842006e+00, 1.30597947372626776996e+00, 120 3.81250023149192607264e+00, 1.31427972905173717777e+00, 121 3.93749827850909683846e+00, 1.32208623339324304879e+00, 122 4.12500187917697846984e+00, 1.33296050364557672196e+00, 123 4.37499759905160701123e+00, 1.34608503917096200553e+00, 124 4.62500066729278191957e+00, 1.35785800701782477518e+00, 125 4.87499852385410648026e+00, 1.36847463881194641999e+00, 126 5.12499918742110072145e+00, 1.37809553833018583191e+00, 127 5.37500000000004529710e+00, 1.38685287025772296943e+00, 128 5.62499999999991828759e+00, 1.39485670134236627860e+00, 129 5.87499417854096694924e+00, 1.40219922327269230777e+00, 130 6.12500000000013233858e+00, 1.40895889555647713109e+00, 131 6.37499999999991828759e+00, 1.41520149881786494461e+00, 132 6.62499933107761584949e+00, 1.42098385532083781868e+00, 133 6.87500431528593747288e+00, 1.42635483782722261026e+00, 134 7.12499228632883863099e+00, 1.43135612069194451124e+00, 135 7.37499257154547205317e+00, 1.43602490820671135907e+00, 136 7.62499911873607416624e+00, 1.44039300400460135165e+00, 137 7.87500000000018918200e+00, 1.44448820973165936721e+00, 138 }; 139