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1 // Copyright 2006-2008 the V8 project authors. All rights reserved. | 1 // Copyright 2006-2008 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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88 | 88 |
89 // ECMA 262 - 15.8.2.8 | 89 // ECMA 262 - 15.8.2.8 |
90 function MathExp(x) { | 90 function MathExp(x) { |
91 if (!IS_NUMBER(x)) x = ToNumber(x); | 91 if (!IS_NUMBER(x)) x = ToNumber(x); |
92 return %Math_exp(x); | 92 return %Math_exp(x); |
93 } | 93 } |
94 | 94 |
95 // ECMA 262 - 15.8.2.9 | 95 // ECMA 262 - 15.8.2.9 |
96 function MathFloor(x) { | 96 function MathFloor(x) { |
97 if (!IS_NUMBER(x)) x = ToNumber(x); | 97 if (!IS_NUMBER(x)) x = ToNumber(x); |
98 if (0 < x && x <= 0x7FFFFFFF) { | 98 // It's more common to call this with a positive number that's out |
| 99 // of range than negative numbers; check the upper bound first. |
| 100 if (x <= 0x7FFFFFFF && x > 0) { |
99 // Numbers in the range [0, 2^31) can be floored by converting | 101 // Numbers in the range [0, 2^31) can be floored by converting |
100 // them to an unsigned 32-bit value using the shift operator. | 102 // them to an unsigned 32-bit value using the shift operator. |
101 // We avoid doing so for -0, because the result of Math.floor(-0) | 103 // We avoid doing so for -0, because the result of Math.floor(-0) |
102 // has to be -0, which wouldn't be the case with the shift. | 104 // has to be -0, which wouldn't be the case with the shift. |
103 return x << 0; | 105 return x << 0; |
104 } else { | 106 } else { |
105 return %Math_floor(x); | 107 return %Math_floor(x); |
106 } | 108 } |
107 } | 109 } |
108 | 110 |
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233 "tan", MathTan, | 235 "tan", MathTan, |
234 "atan2", MathAtan2, | 236 "atan2", MathAtan2, |
235 "pow", MathPow, | 237 "pow", MathPow, |
236 "max", MathMax, | 238 "max", MathMax, |
237 "min", MathMin | 239 "min", MathMin |
238 )); | 240 )); |
239 }; | 241 }; |
240 | 242 |
241 | 243 |
242 SetupMath(); | 244 SetupMath(); |
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