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1 // Copyright 2010 the V8 project authors. All rights reserved. | 1 // Copyright 2010 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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76 e -= DiyFp::kSignificandSize - kSignificandSize; | 76 e -= DiyFp::kSignificandSize - kSignificandSize; |
77 return DiyFp(f, e); | 77 return DiyFp(f, e); |
78 } | 78 } |
79 | 79 |
80 // Returns the double's bit as uint64. | 80 // Returns the double's bit as uint64. |
81 uint64_t AsUint64() const { | 81 uint64_t AsUint64() const { |
82 return d64_; | 82 return d64_; |
83 } | 83 } |
84 | 84 |
85 double NextDouble() const { | 85 double NextDouble() const { |
86 if (d64_ == kInfinity) return kInfinity; | 86 if (d64_ == kInfinity) return Double(kInfinity).value(); |
87 return Double(d64_ + 1).value(); | 87 if (Sign() < 0 && Significand() == 0) { |
| 88 // -0.0 |
| 89 return 0.0; |
| 90 } |
| 91 if (Sign() < 0) { |
| 92 return Double(d64_ - 1).value(); |
| 93 } else { |
| 94 return Double(d64_ + 1).value(); |
| 95 } |
88 } | 96 } |
89 | 97 |
90 int Exponent() const { | 98 int Exponent() const { |
91 if (IsDenormal()) return kDenormalExponent; | 99 if (IsDenormal()) return kDenormalExponent; |
92 | 100 |
93 uint64_t d64 = AsUint64(); | 101 uint64_t d64 = AsUint64(); |
94 int biased_e = | 102 int biased_e = |
95 static_cast<int>((d64 & kExponentMask) >> kPhysicalSignificandSize); | 103 static_cast<int>((d64 & kExponentMask) >> kPhysicalSignificandSize); |
96 return biased_e - kExponentBias; | 104 return biased_e - kExponentBias; |
97 } | 105 } |
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213 biased_exponent = static_cast<uint64_t>(exponent + kExponentBias); | 221 biased_exponent = static_cast<uint64_t>(exponent + kExponentBias); |
214 } | 222 } |
215 return (significand & kSignificandMask) | | 223 return (significand & kSignificandMask) | |
216 (biased_exponent << kPhysicalSignificandSize); | 224 (biased_exponent << kPhysicalSignificandSize); |
217 } | 225 } |
218 }; | 226 }; |
219 | 227 |
220 } } // namespace v8::internal | 228 } } // namespace v8::internal |
221 | 229 |
222 #endif // V8_DOUBLE_H_ | 230 #endif // V8_DOUBLE_H_ |
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