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1 // Copyright 2013 the V8 project authors. All rights reserved. | 1 // Copyright 2013 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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102 function MathAtanh(x) { | 102 function MathAtanh(x) { |
103 if (!IS_NUMBER(x)) x = NonNumberToNumber(x); | 103 if (!IS_NUMBER(x)) x = NonNumberToNumber(x); |
104 // Idempotent for +/-0. | 104 // Idempotent for +/-0. |
105 if (x === 0) return x; | 105 if (x === 0) return x; |
106 // Returns NaN for NaN and +/- Infinity. | 106 // Returns NaN for NaN and +/- Infinity. |
107 if (!NUMBER_IS_FINITE(x)) return NAN; | 107 if (!NUMBER_IS_FINITE(x)) return NAN; |
108 return 0.5 * MathLog((1 + x) / (1 - x)); | 108 return 0.5 * MathLog((1 + x) / (1 - x)); |
109 } | 109 } |
110 | 110 |
111 | 111 |
112 //ES6 draft 09-27-13, section 20.2.2.21. | 112 // ES6 draft 09-27-13, section 20.2.2.21. |
113 function MathLog10(x) { | 113 function MathLog10(x) { |
114 return MathLog(x) * 0.434294481903251828; // log10(x) = log(x)/log(10). | 114 return MathLog(x) * 0.434294481903251828; // log10(x) = log(x)/log(10). |
115 } | 115 } |
116 | 116 |
117 | 117 |
118 //ES6 draft 09-27-13, section 20.2.2.22. | 118 // ES6 draft 09-27-13, section 20.2.2.22. |
119 function MathLog2(x) { | 119 function MathLog2(x) { |
120 return MathLog(x) * 1.442695040888963407; // log2(x) = log(x)/log(2). | 120 return MathLog(x) * 1.442695040888963407; // log2(x) = log(x)/log(2). |
121 } | 121 } |
122 | 122 |
123 | 123 |
124 //ES6 draft 09-27-13, section 20.2.2.17. | 124 // ES6 draft 09-27-13, section 20.2.2.17. |
125 function MathHypot(x, y) { // Function length is 2. | 125 function MathHypot(x, y) { // Function length is 2. |
126 // We may want to introduce fast paths for two arguments and when | 126 // We may want to introduce fast paths for two arguments and when |
127 // normalization to avoid overflow is not necessary. For now, we | 127 // normalization to avoid overflow is not necessary. For now, we |
128 // simply assume the general case. | 128 // simply assume the general case. |
129 var length = %_ArgumentsLength(); | 129 var length = %_ArgumentsLength(); |
130 var args = new InternalArray(length); | 130 var args = new InternalArray(length); |
131 var max = 0; | 131 var max = 0; |
132 for (var i = 0; i < length; i++) { | 132 for (var i = 0; i < length; i++) { |
133 var n = %_Arguments(i); | 133 var n = %_Arguments(i); |
134 if (!IS_NUMBER(n)) n = NonNumberToNumber(n); | 134 if (!IS_NUMBER(n)) n = NonNumberToNumber(n); |
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147 var n = args[i] / max; | 147 var n = args[i] / max; |
148 var summand = n * n - compensation; | 148 var summand = n * n - compensation; |
149 var preliminary = sum + summand; | 149 var preliminary = sum + summand; |
150 compensation = (preliminary - sum) - summand; | 150 compensation = (preliminary - sum) - summand; |
151 sum = preliminary; | 151 sum = preliminary; |
152 } | 152 } |
153 return MathSqrt(sum) * max; | 153 return MathSqrt(sum) * max; |
154 } | 154 } |
155 | 155 |
156 | 156 |
| 157 // ES6 draft 09-27-13, section 20.2.2.16. |
| 158 function MathFround(x) { |
| 159 return %Math_fround(TO_NUMBER_INLINE(x)); |
| 160 } |
| 161 |
| 162 |
157 function ExtendMath() { | 163 function ExtendMath() { |
158 %CheckIsBootstrapping(); | 164 %CheckIsBootstrapping(); |
159 | 165 |
160 // Set up the non-enumerable functions on the Math object. | 166 // Set up the non-enumerable functions on the Math object. |
161 InstallFunctions($Math, DONT_ENUM, $Array( | 167 InstallFunctions($Math, DONT_ENUM, $Array( |
162 "sign", MathSign, | 168 "sign", MathSign, |
163 "trunc", MathTrunc, | 169 "trunc", MathTrunc, |
164 "sinh", MathSinh, | 170 "sinh", MathSinh, |
165 "cosh", MathCosh, | 171 "cosh", MathCosh, |
166 "tanh", MathTanh, | 172 "tanh", MathTanh, |
167 "asinh", MathAsinh, | 173 "asinh", MathAsinh, |
168 "acosh", MathAcosh, | 174 "acosh", MathAcosh, |
169 "atanh", MathAtanh, | 175 "atanh", MathAtanh, |
170 "log10", MathLog10, | 176 "log10", MathLog10, |
171 "log2", MathLog2, | 177 "log2", MathLog2, |
172 "hypot", MathHypot | 178 "hypot", MathHypot, |
| 179 "fround", MathFround |
173 )); | 180 )); |
174 } | 181 } |
175 | 182 |
176 ExtendMath(); | 183 ExtendMath(); |
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