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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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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 function MathClz32(x) { | |
Sven Panne
2014/02/18 07:21:24
What TC39 seems to intend is basically exposing so
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158 x = ToUint32(TO_NUMBER_INLINE(x)); | |
159 if (x == 0) return 32; | |
160 var result = 0; | |
161 // Binary search. | |
162 if ((x & 0xFFFF0000) === 0) { x <<= 16; result += 16; }; | |
163 if ((x & 0xFF000000) === 0) { x <<= 8; result += 8; }; | |
164 if ((x & 0xF0000000) === 0) { x <<= 4; result += 4; }; | |
165 if ((x & 0xC0000000) === 0) { x <<= 2; result += 2; }; | |
166 if ((x & 0x80000000) === 0) { x <<= 1; result += 1; }; | |
167 return result; | |
168 } | |
169 | |
170 | |
157 function ExtendMath() { | 171 function ExtendMath() { |
158 %CheckIsBootstrapping(); | 172 %CheckIsBootstrapping(); |
159 | 173 |
160 // Set up the non-enumerable functions on the Math object. | 174 // Set up the non-enumerable functions on the Math object. |
161 InstallFunctions($Math, DONT_ENUM, $Array( | 175 InstallFunctions($Math, DONT_ENUM, $Array( |
162 "sign", MathSign, | 176 "sign", MathSign, |
163 "trunc", MathTrunc, | 177 "trunc", MathTrunc, |
164 "sinh", MathSinh, | 178 "sinh", MathSinh, |
165 "cosh", MathCosh, | 179 "cosh", MathCosh, |
166 "tanh", MathTanh, | 180 "tanh", MathTanh, |
167 "asinh", MathAsinh, | 181 "asinh", MathAsinh, |
168 "acosh", MathAcosh, | 182 "acosh", MathAcosh, |
169 "atanh", MathAtanh, | 183 "atanh", MathAtanh, |
170 "log10", MathLog10, | 184 "log10", MathLog10, |
171 "log2", MathLog2, | 185 "log2", MathLog2, |
172 "hypot", MathHypot | 186 "hypot", MathHypot, |
187 "clz32", MathClz32 | |
173 )); | 188 )); |
174 } | 189 } |
175 | 190 |
191 | |
176 ExtendMath(); | 192 ExtendMath(); |
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