1 | /* origin: FreeBSD /usr/src/lib/msun/src/s_exp2.c */
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2 | /*-
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3 | * Copyright (c) 2005 David Schultz <das@FreeBSD.ORG>
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4 | * All rights reserved.
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5 | *
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6 | * Redistribution and use in source and binary forms, with or without
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7 | * modification, are permitted provided that the following conditions
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8 | * are met:
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9 | * 1. Redistributions of source code must retain the above copyright
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10 | * notice, this list of conditions and the following disclaimer.
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11 | * 2. Redistributions in binary form must reproduce the above copyright
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12 | * notice, this list of conditions and the following disclaimer in the
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13 | * documentation and/or other materials provided with the distribution.
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14 | *
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15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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16 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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17 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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18 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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19 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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20 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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21 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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22 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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23 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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24 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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25 | * SUCH DAMAGE.
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26 | */
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27 |
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28 | #include "libm.h"
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29 |
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30 | #define TBLSIZE 256
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31 |
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32 | static const double
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33 | redux = 0x1.8p52 / TBLSIZE,
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34 | P1 = 0x1.62e42fefa39efp-1,
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35 | P2 = 0x1.ebfbdff82c575p-3,
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36 | P3 = 0x1.c6b08d704a0a6p-5,
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37 | P4 = 0x1.3b2ab88f70400p-7,
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38 | P5 = 0x1.5d88003875c74p-10;
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39 |
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40 | static const double tbl[TBLSIZE * 2] = {
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41 | /* exp2(z + eps) eps */
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42 | 0x1.6a09e667f3d5dp-1, 0x1.9880p-44,
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43 | 0x1.6b052fa751744p-1, 0x1.8000p-50,
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44 | 0x1.6c012750bd9fep-1, -0x1.8780p-45,
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45 | 0x1.6cfdcddd476bfp-1, 0x1.ec00p-46,
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46 | 0x1.6dfb23c651a29p-1, -0x1.8000p-50,
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47 | 0x1.6ef9298593ae3p-1, -0x1.c000p-52,
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48 | 0x1.6ff7df9519386p-1, -0x1.fd80p-45,
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49 | 0x1.70f7466f42da3p-1, -0x1.c880p-45,
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50 | 0x1.71f75e8ec5fc3p-1, 0x1.3c00p-46,
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51 | 0x1.72f8286eacf05p-1, -0x1.8300p-44,
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52 | 0x1.73f9a48a58152p-1, -0x1.0c00p-47,
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53 | 0x1.74fbd35d7ccfcp-1, 0x1.f880p-45,
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54 | 0x1.75feb564267f1p-1, 0x1.3e00p-47,
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55 | 0x1.77024b1ab6d48p-1, -0x1.7d00p-45,
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56 | 0x1.780694fde5d38p-1, -0x1.d000p-50,
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57 | 0x1.790b938ac1d00p-1, 0x1.3000p-49,
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58 | 0x1.7a11473eb0178p-1, -0x1.d000p-49,
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59 | 0x1.7b17b0976d060p-1, 0x1.0400p-45,
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60 | 0x1.7c1ed0130c133p-1, 0x1.0000p-53,
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61 | 0x1.7d26a62ff8636p-1, -0x1.6900p-45,
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62 | 0x1.7e2f336cf4e3bp-1, -0x1.2e00p-47,
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63 | 0x1.7f3878491c3e8p-1, -0x1.4580p-45,
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64 | 0x1.80427543e1b4ep-1, 0x1.3000p-44,
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65 | 0x1.814d2add1071ap-1, 0x1.f000p-47,
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66 | 0x1.82589994ccd7ep-1, -0x1.1c00p-45,
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67 | 0x1.8364c1eb942d0p-1, 0x1.9d00p-45,
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68 | 0x1.8471a4623cab5p-1, 0x1.7100p-43,
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69 | 0x1.857f4179f5bbcp-1, 0x1.2600p-45,
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70 | 0x1.868d99b4491afp-1, -0x1.2c40p-44,
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71 | 0x1.879cad931a395p-1, -0x1.3000p-45,
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72 | 0x1.88ac7d98a65b8p-1, -0x1.a800p-45,
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73 | 0x1.89bd0a4785800p-1, -0x1.d000p-49,
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74 | 0x1.8ace5422aa223p-1, 0x1.3280p-44,
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75 | 0x1.8be05bad619fap-1, 0x1.2b40p-43,
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76 | 0x1.8cf3216b54383p-1, -0x1.ed00p-45,
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77 | 0x1.8e06a5e08664cp-1, -0x1.0500p-45,
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78 | 0x1.8f1ae99157807p-1, 0x1.8280p-45,
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79 | 0x1.902fed0282c0ep-1, -0x1.cb00p-46,
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80 | 0x1.9145b0b91ff96p-1, -0x1.5e00p-47,
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81 | 0x1.925c353aa2ff9p-1, 0x1.5400p-48,
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82 | 0x1.93737b0cdc64ap-1, 0x1.7200p-46,
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83 | 0x1.948b82b5f98aep-1, -0x1.9000p-47,
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84 | 0x1.95a44cbc852cbp-1, 0x1.5680p-45,
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85 | 0x1.96bdd9a766f21p-1, -0x1.6d00p-44,
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86 | 0x1.97d829fde4e2ap-1, -0x1.1000p-47,
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87 | 0x1.98f33e47a23a3p-1, 0x1.d000p-45,
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88 | 0x1.9a0f170ca0604p-1, -0x1.8a40p-44,
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89 | 0x1.9b2bb4d53ff89p-1, 0x1.55c0p-44,
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90 | 0x1.9c49182a3f15bp-1, 0x1.6b80p-45,
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91 | 0x1.9d674194bb8c5p-1, -0x1.c000p-49,
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92 | 0x1.9e86319e3238ep-1, 0x1.7d00p-46,
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93 | 0x1.9fa5e8d07f302p-1, 0x1.6400p-46,
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94 | 0x1.a0c667b5de54dp-1, -0x1.5000p-48,
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95 | 0x1.a1e7aed8eb8f6p-1, 0x1.9e00p-47,
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96 | 0x1.a309bec4a2e27p-1, 0x1.ad80p-45,
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97 | 0x1.a42c980460a5dp-1, -0x1.af00p-46,
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98 | 0x1.a5503b23e259bp-1, 0x1.b600p-47,
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99 | 0x1.a674a8af46213p-1, 0x1.8880p-44,
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100 | 0x1.a799e1330b3a7p-1, 0x1.1200p-46,
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101 | 0x1.a8bfe53c12e8dp-1, 0x1.6c00p-47,
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102 | 0x1.a9e6b5579fcd2p-1, -0x1.9b80p-45,
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103 | 0x1.ab0e521356fb8p-1, 0x1.b700p-45,
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104 | 0x1.ac36bbfd3f381p-1, 0x1.9000p-50,
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105 | 0x1.ad5ff3a3c2780p-1, 0x1.4000p-49,
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106 | 0x1.ae89f995ad2a3p-1, -0x1.c900p-45,
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107 | 0x1.afb4ce622f367p-1, 0x1.6500p-46,
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108 | 0x1.b0e07298db790p-1, 0x1.fd40p-45,
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109 | 0x1.b20ce6c9a89a9p-1, 0x1.2700p-46,
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110 | 0x1.b33a2b84f1a4bp-1, 0x1.d470p-43,
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111 | 0x1.b468415b747e7p-1, -0x1.8380p-44,
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112 | 0x1.b59728de5593ap-1, 0x1.8000p-54,
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113 | 0x1.b6c6e29f1c56ap-1, 0x1.ad00p-47,
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114 | 0x1.b7f76f2fb5e50p-1, 0x1.e800p-50,
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115 | 0x1.b928cf22749b2p-1, -0x1.4c00p-47,
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116 | 0x1.ba5b030a10603p-1, -0x1.d700p-47,
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117 | 0x1.bb8e0b79a6f66p-1, 0x1.d900p-47,
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118 | 0x1.bcc1e904bc1ffp-1, 0x1.2a00p-47,
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119 | 0x1.bdf69c3f3a16fp-1, -0x1.f780p-46,
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120 | 0x1.bf2c25bd71db8p-1, -0x1.0a00p-46,
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121 | 0x1.c06286141b2e9p-1, -0x1.1400p-46,
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122 | 0x1.c199bdd8552e0p-1, 0x1.be00p-47,
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123 | 0x1.c2d1cd9fa64eep-1, -0x1.9400p-47,
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124 | 0x1.c40ab5fffd02fp-1, -0x1.ed00p-47,
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125 | 0x1.c544778fafd15p-1, 0x1.9660p-44,
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126 | 0x1.c67f12e57d0cbp-1, -0x1.a100p-46,
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127 | 0x1.c7ba88988c1b6p-1, -0x1.8458p-42,
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128 | 0x1.c8f6d9406e733p-1, -0x1.a480p-46,
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129 | 0x1.ca3405751c4dfp-1, 0x1.b000p-51,
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130 | 0x1.cb720dcef9094p-1, 0x1.1400p-47,
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131 | 0x1.ccb0f2e6d1689p-1, 0x1.0200p-48,
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132 | 0x1.cdf0b555dc412p-1, 0x1.3600p-48,
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133 | 0x1.cf3155b5bab3bp-1, -0x1.6900p-47,
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134 | 0x1.d072d4a0789bcp-1, 0x1.9a00p-47,
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135 | 0x1.d1b532b08c8fap-1, -0x1.5e00p-46,
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136 | 0x1.d2f87080d8a85p-1, 0x1.d280p-46,
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137 | 0x1.d43c8eacaa203p-1, 0x1.1a00p-47,
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138 | 0x1.d5818dcfba491p-1, 0x1.f000p-50,
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139 | 0x1.d6c76e862e6a1p-1, -0x1.3a00p-47,
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140 | 0x1.d80e316c9834ep-1, -0x1.cd80p-47,
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141 | 0x1.d955d71ff6090p-1, 0x1.4c00p-48,
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142 | 0x1.da9e603db32aep-1, 0x1.f900p-48,
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143 | 0x1.dbe7cd63a8325p-1, 0x1.9800p-49,
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144 | 0x1.dd321f301b445p-1, -0x1.5200p-48,
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145 | 0x1.de7d5641c05bfp-1, -0x1.d700p-46,
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146 | 0x1.dfc97337b9aecp-1, -0x1.6140p-46,
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147 | 0x1.e11676b197d5ep-1, 0x1.b480p-47,
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148 | 0x1.e264614f5a3e7p-1, 0x1.0ce0p-43,
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149 | 0x1.e3b333b16ee5cp-1, 0x1.c680p-47,
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150 | 0x1.e502ee78b3fb4p-1, -0x1.9300p-47,
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151 | 0x1.e653924676d68p-1, -0x1.5000p-49,
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152 | 0x1.e7a51fbc74c44p-1, -0x1.7f80p-47,
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153 | 0x1.e8f7977cdb726p-1, -0x1.3700p-48,
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154 | 0x1.ea4afa2a490e8p-1, 0x1.5d00p-49,
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155 | 0x1.eb9f4867ccae4p-1, 0x1.61a0p-46,
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156 | 0x1.ecf482d8e680dp-1, 0x1.5500p-48,
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157 | 0x1.ee4aaa2188514p-1, 0x1.6400p-51,
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158 | 0x1.efa1bee615a13p-1, -0x1.e800p-49,
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159 | 0x1.f0f9c1cb64106p-1, -0x1.a880p-48,
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160 | 0x1.f252b376bb963p-1, -0x1.c900p-45,
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161 | 0x1.f3ac948dd7275p-1, 0x1.a000p-53,
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162 | 0x1.f50765b6e4524p-1, -0x1.4f00p-48,
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163 | 0x1.f6632798844fdp-1, 0x1.a800p-51,
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164 | 0x1.f7bfdad9cbe38p-1, 0x1.abc0p-48,
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165 | 0x1.f91d802243c82p-1, -0x1.4600p-50,
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166 | 0x1.fa7c1819e908ep-1, -0x1.b0c0p-47,
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167 | 0x1.fbdba3692d511p-1, -0x1.0e00p-51,
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168 | 0x1.fd3c22b8f7194p-1, -0x1.0de8p-46,
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169 | 0x1.fe9d96b2a23eep-1, 0x1.e430p-49,
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170 | 0x1.0000000000000p+0, 0x0.0000p+0,
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171 | 0x1.00b1afa5abcbep+0, -0x1.3400p-52,
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172 | 0x1.0163da9fb3303p+0, -0x1.2170p-46,
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173 | 0x1.02168143b0282p+0, 0x1.a400p-52,
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174 | 0x1.02c9a3e77806cp+0, 0x1.f980p-49,
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175 | 0x1.037d42e11bbcap+0, -0x1.7400p-51,
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176 | 0x1.04315e86e7f89p+0, 0x1.8300p-50,
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177 | 0x1.04e5f72f65467p+0, -0x1.a3f0p-46,
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178 | 0x1.059b0d315855ap+0, -0x1.2840p-47,
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179 | 0x1.0650a0e3c1f95p+0, 0x1.1600p-48,
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180 | 0x1.0706b29ddf71ap+0, 0x1.5240p-46,
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181 | 0x1.07bd42b72a82dp+0, -0x1.9a00p-49,
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182 | 0x1.0874518759bd0p+0, 0x1.6400p-49,
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183 | 0x1.092bdf66607c8p+0, -0x1.0780p-47,
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184 | 0x1.09e3ecac6f383p+0, -0x1.8000p-54,
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185 | 0x1.0a9c79b1f3930p+0, 0x1.fa00p-48,
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186 | 0x1.0b5586cf988fcp+0, -0x1.ac80p-48,
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187 | 0x1.0c0f145e46c8ap+0, 0x1.9c00p-50,
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188 | 0x1.0cc922b724816p+0, 0x1.5200p-47,
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189 | 0x1.0d83b23395dd8p+0, -0x1.ad00p-48,
|
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190 | 0x1.0e3ec32d3d1f3p+0, 0x1.bac0p-46,
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191 | 0x1.0efa55fdfa9a6p+0, -0x1.4e80p-47,
|
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192 | 0x1.0fb66affed2f0p+0, -0x1.d300p-47,
|
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193 | 0x1.1073028d7234bp+0, 0x1.1500p-48,
|
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194 | 0x1.11301d0125b5bp+0, 0x1.c000p-49,
|
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195 | 0x1.11edbab5e2af9p+0, 0x1.6bc0p-46,
|
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196 | 0x1.12abdc06c31d5p+0, 0x1.8400p-49,
|
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197 | 0x1.136a814f2047dp+0, -0x1.ed00p-47,
|
---|
198 | 0x1.1429aaea92de9p+0, 0x1.8e00p-49,
|
---|
199 | 0x1.14e95934f3138p+0, 0x1.b400p-49,
|
---|
200 | 0x1.15a98c8a58e71p+0, 0x1.5300p-47,
|
---|
201 | 0x1.166a45471c3dfp+0, 0x1.3380p-47,
|
---|
202 | 0x1.172b83c7d5211p+0, 0x1.8d40p-45,
|
---|
203 | 0x1.17ed48695bb9fp+0, -0x1.5d00p-47,
|
---|
204 | 0x1.18af9388c8d93p+0, -0x1.c880p-46,
|
---|
205 | 0x1.1972658375d66p+0, 0x1.1f00p-46,
|
---|
206 | 0x1.1a35beb6fcba7p+0, 0x1.0480p-46,
|
---|
207 | 0x1.1af99f81387e3p+0, -0x1.7390p-43,
|
---|
208 | 0x1.1bbe084045d54p+0, 0x1.4e40p-45,
|
---|
209 | 0x1.1c82f95281c43p+0, -0x1.a200p-47,
|
---|
210 | 0x1.1d4873168b9b2p+0, 0x1.3800p-49,
|
---|
211 | 0x1.1e0e75eb44031p+0, 0x1.ac00p-49,
|
---|
212 | 0x1.1ed5022fcd938p+0, 0x1.1900p-47,
|
---|
213 | 0x1.1f9c18438cdf7p+0, -0x1.b780p-46,
|
---|
214 | 0x1.2063b88628d8fp+0, 0x1.d940p-45,
|
---|
215 | 0x1.212be3578a81ep+0, 0x1.8000p-50,
|
---|
216 | 0x1.21f49917ddd41p+0, 0x1.b340p-45,
|
---|
217 | 0x1.22bdda2791323p+0, 0x1.9f80p-46,
|
---|
218 | 0x1.2387a6e7561e7p+0, -0x1.9c80p-46,
|
---|
219 | 0x1.2451ffb821427p+0, 0x1.2300p-47,
|
---|
220 | 0x1.251ce4fb2a602p+0, -0x1.3480p-46,
|
---|
221 | 0x1.25e85711eceb0p+0, 0x1.2700p-46,
|
---|
222 | 0x1.26b4565e27d16p+0, 0x1.1d00p-46,
|
---|
223 | 0x1.2780e341de00fp+0, 0x1.1ee0p-44,
|
---|
224 | 0x1.284dfe1f5633ep+0, -0x1.4c00p-46,
|
---|
225 | 0x1.291ba7591bb30p+0, -0x1.3d80p-46,
|
---|
226 | 0x1.29e9df51fdf09p+0, 0x1.8b00p-47,
|
---|
227 | 0x1.2ab8a66d10e9bp+0, -0x1.27c0p-45,
|
---|
228 | 0x1.2b87fd0dada3ap+0, 0x1.a340p-45,
|
---|
229 | 0x1.2c57e39771af9p+0, -0x1.0800p-46,
|
---|
230 | 0x1.2d285a6e402d9p+0, -0x1.ed00p-47,
|
---|
231 | 0x1.2df961f641579p+0, -0x1.4200p-48,
|
---|
232 | 0x1.2ecafa93e2ecfp+0, -0x1.4980p-45,
|
---|
233 | 0x1.2f9d24abd8822p+0, -0x1.6300p-46,
|
---|
234 | 0x1.306fe0a31b625p+0, -0x1.2360p-44,
|
---|
235 | 0x1.31432edeea50bp+0, -0x1.0df8p-40,
|
---|
236 | 0x1.32170fc4cd7b8p+0, -0x1.2480p-45,
|
---|
237 | 0x1.32eb83ba8e9a2p+0, -0x1.5980p-45,
|
---|
238 | 0x1.33c08b2641766p+0, 0x1.ed00p-46,
|
---|
239 | 0x1.3496266e3fa27p+0, -0x1.c000p-50,
|
---|
240 | 0x1.356c55f929f0fp+0, -0x1.0d80p-44,
|
---|
241 | 0x1.36431a2de88b9p+0, 0x1.2c80p-45,
|
---|
242 | 0x1.371a7373aaa39p+0, 0x1.0600p-45,
|
---|
243 | 0x1.37f26231e74fep+0, -0x1.6600p-46,
|
---|
244 | 0x1.38cae6d05d838p+0, -0x1.ae00p-47,
|
---|
245 | 0x1.39a401b713ec3p+0, -0x1.4720p-43,
|
---|
246 | 0x1.3a7db34e5a020p+0, 0x1.8200p-47,
|
---|
247 | 0x1.3b57fbfec6e95p+0, 0x1.e800p-44,
|
---|
248 | 0x1.3c32dc313a8f2p+0, 0x1.f800p-49,
|
---|
249 | 0x1.3d0e544ede122p+0, -0x1.7a00p-46,
|
---|
250 | 0x1.3dea64c1234bbp+0, 0x1.6300p-45,
|
---|
251 | 0x1.3ec70df1c4eccp+0, -0x1.8a60p-43,
|
---|
252 | 0x1.3fa4504ac7e8cp+0, -0x1.cdc0p-44,
|
---|
253 | 0x1.40822c367a0bbp+0, 0x1.5b80p-45,
|
---|
254 | 0x1.4160a21f72e95p+0, 0x1.ec00p-46,
|
---|
255 | 0x1.423fb27094646p+0, -0x1.3600p-46,
|
---|
256 | 0x1.431f5d950a920p+0, 0x1.3980p-45,
|
---|
257 | 0x1.43ffa3f84b9ebp+0, 0x1.a000p-48,
|
---|
258 | 0x1.44e0860618919p+0, -0x1.6c00p-48,
|
---|
259 | 0x1.45c2042a7d201p+0, -0x1.bc00p-47,
|
---|
260 | 0x1.46a41ed1d0016p+0, -0x1.2800p-46,
|
---|
261 | 0x1.4786d668b3326p+0, 0x1.0e00p-44,
|
---|
262 | 0x1.486a2b5c13c00p+0, -0x1.d400p-45,
|
---|
263 | 0x1.494e1e192af04p+0, 0x1.c200p-47,
|
---|
264 | 0x1.4a32af0d7d372p+0, -0x1.e500p-46,
|
---|
265 | 0x1.4b17dea6db801p+0, 0x1.7800p-47,
|
---|
266 | 0x1.4bfdad53629e1p+0, -0x1.3800p-46,
|
---|
267 | 0x1.4ce41b817c132p+0, 0x1.0800p-47,
|
---|
268 | 0x1.4dcb299fddddbp+0, 0x1.c700p-45,
|
---|
269 | 0x1.4eb2d81d8ab96p+0, -0x1.ce00p-46,
|
---|
270 | 0x1.4f9b2769d2d02p+0, 0x1.9200p-46,
|
---|
271 | 0x1.508417f4531c1p+0, -0x1.8c00p-47,
|
---|
272 | 0x1.516daa2cf662ap+0, -0x1.a000p-48,
|
---|
273 | 0x1.5257de83f51eap+0, 0x1.a080p-43,
|
---|
274 | 0x1.5342b569d4edap+0, -0x1.6d80p-45,
|
---|
275 | 0x1.542e2f4f6ac1ap+0, -0x1.2440p-44,
|
---|
276 | 0x1.551a4ca5d94dbp+0, 0x1.83c0p-43,
|
---|
277 | 0x1.56070dde9116bp+0, 0x1.4b00p-45,
|
---|
278 | 0x1.56f4736b529dep+0, 0x1.15a0p-43,
|
---|
279 | 0x1.57e27dbe2c40ep+0, -0x1.9e00p-45,
|
---|
280 | 0x1.58d12d497c76fp+0, -0x1.3080p-45,
|
---|
281 | 0x1.59c0827ff0b4cp+0, 0x1.dec0p-43,
|
---|
282 | 0x1.5ab07dd485427p+0, -0x1.4000p-51,
|
---|
283 | 0x1.5ba11fba87af4p+0, 0x1.0080p-44,
|
---|
284 | 0x1.5c9268a59460bp+0, -0x1.6c80p-45,
|
---|
285 | 0x1.5d84590998e3fp+0, 0x1.69a0p-43,
|
---|
286 | 0x1.5e76f15ad20e1p+0, -0x1.b400p-46,
|
---|
287 | 0x1.5f6a320dcebcap+0, 0x1.7700p-46,
|
---|
288 | 0x1.605e1b976dcb8p+0, 0x1.6f80p-45,
|
---|
289 | 0x1.6152ae6cdf715p+0, 0x1.1000p-47,
|
---|
290 | 0x1.6247eb03a5531p+0, -0x1.5d00p-46,
|
---|
291 | 0x1.633dd1d1929b5p+0, -0x1.2d00p-46,
|
---|
292 | 0x1.6434634ccc313p+0, -0x1.a800p-49,
|
---|
293 | 0x1.652b9febc8efap+0, -0x1.8600p-45,
|
---|
294 | 0x1.6623882553397p+0, 0x1.1fe0p-40,
|
---|
295 | 0x1.671c1c708328ep+0, -0x1.7200p-44,
|
---|
296 | 0x1.68155d44ca97ep+0, 0x1.6800p-49,
|
---|
297 | 0x1.690f4b19e9471p+0, -0x1.9780p-45,
|
---|
298 | };
|
---|
299 |
|
---|
300 | /*
|
---|
301 | * exp2(x): compute the base 2 exponential of x
|
---|
302 | *
|
---|
303 | * Accuracy: Peak error < 0.503 ulp for normalized results.
|
---|
304 | *
|
---|
305 | * Method: (accurate tables)
|
---|
306 | *
|
---|
307 | * Reduce x:
|
---|
308 | * x = k + y, for integer k and |y| <= 1/2.
|
---|
309 | * Thus we have exp2(x) = 2**k * exp2(y).
|
---|
310 | *
|
---|
311 | * Reduce y:
|
---|
312 | * y = i/TBLSIZE + z - eps[i] for integer i near y * TBLSIZE.
|
---|
313 | * Thus we have exp2(y) = exp2(i/TBLSIZE) * exp2(z - eps[i]),
|
---|
314 | * with |z - eps[i]| <= 2**-9 + 2**-39 for the table used.
|
---|
315 | *
|
---|
316 | * We compute exp2(i/TBLSIZE) via table lookup and exp2(z - eps[i]) via
|
---|
317 | * a degree-5 minimax polynomial with maximum error under 1.3 * 2**-61.
|
---|
318 | * The values in exp2t[] and eps[] are chosen such that
|
---|
319 | * exp2t[i] = exp2(i/TBLSIZE + eps[i]), and eps[i] is a small offset such
|
---|
320 | * that exp2t[i] is accurate to 2**-64.
|
---|
321 | *
|
---|
322 | * Note that the range of i is +-TBLSIZE/2, so we actually index the tables
|
---|
323 | * by i0 = i + TBLSIZE/2. For cache efficiency, exp2t[] and eps[] are
|
---|
324 | * virtual tables, interleaved in the real table tbl[].
|
---|
325 | *
|
---|
326 | * This method is due to Gal, with many details due to Gal and Bachelis:
|
---|
327 | *
|
---|
328 | * Gal, S. and Bachelis, B. An Accurate Elementary Mathematical Library
|
---|
329 | * for the IEEE Floating Point Standard. TOMS 17(1), 26-46 (1991).
|
---|
330 | */
|
---|
331 | double exp2(double x)
|
---|
332 | {
|
---|
333 | double_t r, t, z;
|
---|
334 | uint32_t ix, i0;
|
---|
335 | union {double f; uint64_t i;} u = {x};
|
---|
336 | union {uint32_t u; int32_t i;} k;
|
---|
337 |
|
---|
338 | /* Filter out exceptional cases. */
|
---|
339 | ix = u.i>>32 & 0x7fffffff;
|
---|
340 | if (ix >= 0x408ff000) { /* |x| >= 1022 or nan */
|
---|
341 | if (ix >= 0x40900000 && u.i>>63 == 0) { /* x >= 1024 or nan */
|
---|
342 | /* overflow */
|
---|
343 | x *= 0x1p1023;
|
---|
344 | return x;
|
---|
345 | }
|
---|
346 | if (ix >= 0x7ff00000) /* -inf or -nan */
|
---|
347 | return -1/x;
|
---|
348 | if (u.i>>63) { /* x <= -1022 */
|
---|
349 | /* underflow */
|
---|
350 | if (x <= -1075 || x - 0x1p52 + 0x1p52 != x)
|
---|
351 | FORCE_EVAL((float)(-0x1p-149/x));
|
---|
352 | if (x <= -1075)
|
---|
353 | return 0;
|
---|
354 | }
|
---|
355 | } else if (ix < 0x3c900000) { /* |x| < 0x1p-54 */
|
---|
356 | return 1.0 + x;
|
---|
357 | }
|
---|
358 |
|
---|
359 | /* Reduce x, computing z, i0, and k. */
|
---|
360 | u.f = x + redux;
|
---|
361 | i0 = u.i;
|
---|
362 | i0 += TBLSIZE / 2;
|
---|
363 | k.u = i0 / TBLSIZE * TBLSIZE;
|
---|
364 | k.i /= TBLSIZE;
|
---|
365 | i0 %= TBLSIZE;
|
---|
366 | u.f -= redux;
|
---|
367 | z = x - u.f;
|
---|
368 |
|
---|
369 | /* Compute r = exp2(y) = exp2t[i0] * p(z - eps[i]). */
|
---|
370 | t = tbl[2*i0]; /* exp2t[i0] */
|
---|
371 | z -= tbl[2*i0 + 1]; /* eps[i0] */
|
---|
372 | r = t + t * z * (P1 + z * (P2 + z * (P3 + z * (P4 + z * P5))));
|
---|
373 |
|
---|
374 | return scalbn(r, k.i);
|
---|
375 | }
|
---|