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Side by Side Diff: third_party/WebKit/Source/wtf/dtoa/diy-fp.h

Issue 1611343002: wtf reformat test Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: pydent Created 4 years, 11 months ago
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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
(...skipping 16 matching lines...) Expand all
27 27
28 #ifndef DOUBLE_CONVERSION_DIY_FP_H_ 28 #ifndef DOUBLE_CONVERSION_DIY_FP_H_
29 #define DOUBLE_CONVERSION_DIY_FP_H_ 29 #define DOUBLE_CONVERSION_DIY_FP_H_
30 30
31 #include "utils.h" 31 #include "utils.h"
32 32
33 namespace WTF { 33 namespace WTF {
34 34
35 namespace double_conversion { 35 namespace double_conversion {
36 36
37 // This "Do It Yourself Floating Point" class implements a floating-point nu mber 37 // This "Do It Yourself Floating Point" class implements a floating-point number
38 // with a uint64 significand and an int exponent. Normalized DiyFp numbers w ill 38 // with a uint64 significand and an int exponent. Normalized DiyFp numbers will
39 // have the most significant bit of the significand set. 39 // have the most significant bit of the significand set.
40 // Multiplication and Subtraction do not normalize their results. 40 // Multiplication and Subtraction do not normalize their results.
41 // DiyFp are not designed to contain special doubles (NaN and Infinity). 41 // DiyFp are not designed to contain special doubles (NaN and Infinity).
42 class DiyFp { 42 class DiyFp {
43 public: 43 public:
44 static const int kSignificandSize = 64; 44 static const int kSignificandSize = 64;
45 45
46 DiyFp() : f_(0), e_(0) {} 46 DiyFp() : f_(0), e_(0) {}
47 DiyFp(uint64_t f, int e) : f_(f), e_(e) {} 47 DiyFp(uint64_t f, int e) : f_(f), e_(e) {}
48 48
49 // this = this - other. 49 // this = this - other.
50 // The exponents of both numbers must be the same and the significand of this 50 // The exponents of both numbers must be the same and the significand of this
51 // must be bigger than the significand of other. 51 // must be bigger than the significand of other.
52 // The result will not be normalized. 52 // The result will not be normalized.
53 void Subtract(const DiyFp& other) { 53 void Subtract(const DiyFp& other) {
54 ASSERT(e_ == other.e_); 54 ASSERT(e_ == other.e_);
55 ASSERT(f_ >= other.f_); 55 ASSERT(f_ >= other.f_);
56 f_ -= other.f_; 56 f_ -= other.f_;
57 } 57 }
58 58
59 // Returns a - b. 59 // Returns a - b.
60 // The exponents of both numbers must be the same and this must be bigge r 60 // The exponents of both numbers must be the same and this must be bigger
61 // than other. The result will not be normalized. 61 // than other. The result will not be normalized.
62 static DiyFp Minus(const DiyFp& a, const DiyFp& b) { 62 static DiyFp Minus(const DiyFp& a, const DiyFp& b) {
63 DiyFp result = a; 63 DiyFp result = a;
64 result.Subtract(b); 64 result.Subtract(b);
65 return result; 65 return result;
66 } 66 }
67 67
68 // this = this * other.
69 void Multiply(const DiyFp& other);
68 70
69 // this = this * other. 71 // returns a * b;
70 void Multiply(const DiyFp& other); 72 static DiyFp Times(const DiyFp& a, const DiyFp& b) {
73 DiyFp result = a;
74 result.Multiply(b);
75 return result;
76 }
71 77
72 // returns a * b; 78 void Normalize() {
73 static DiyFp Times(const DiyFp& a, const DiyFp& b) { 79 ASSERT(f_ != 0);
74 DiyFp result = a; 80 uint64_t f = f_;
75 result.Multiply(b); 81 int e = e_;
76 return result;
77 }
78 82
79 void Normalize() { 83 // This method is mainly called for normalizing boundaries. In general
80 ASSERT(f_ != 0); 84 // boundaries need to be shifted by 10 bits. We thus optimize for this case.
81 uint64_t f = f_; 85 const uint64_t k10MSBits = UINT64_2PART_C(0xFFC00000, 00000000);
82 int e = e_; 86 while ((f & k10MSBits) == 0) {
87 f <<= 10;
88 e -= 10;
89 }
90 while ((f & kUint64MSB) == 0) {
91 f <<= 1;
92 e--;
93 }
94 f_ = f;
95 e_ = e;
96 }
83 97
84 // This method is mainly called for normalizing boundaries. In gener al 98 static DiyFp Normalize(const DiyFp& a) {
85 // boundaries need to be shifted by 10 bits. We thus optimize for th is case. 99 DiyFp result = a;
86 const uint64_t k10MSBits = UINT64_2PART_C(0xFFC00000, 00000000); 100 result.Normalize();
87 while ((f & k10MSBits) == 0) { 101 return result;
88 f <<= 10; 102 }
89 e -= 10;
90 }
91 while ((f & kUint64MSB) == 0) {
92 f <<= 1;
93 e--;
94 }
95 f_ = f;
96 e_ = e;
97 }
98 103
99 static DiyFp Normalize(const DiyFp& a) { 104 uint64_t f() const { return f_; }
100 DiyFp result = a; 105 int e() const { return e_; }
101 result.Normalize();
102 return result;
103 }
104 106
105 uint64_t f() const { return f_; } 107 void set_f(uint64_t new_value) { f_ = new_value; }
106 int e() const { return e_; } 108 void set_e(int new_value) { e_ = new_value; }
107 109
108 void set_f(uint64_t new_value) { f_ = new_value; } 110 private:
109 void set_e(int new_value) { e_ = new_value; } 111 static const uint64_t kUint64MSB = UINT64_2PART_C(0x80000000, 00000000);
110 112
111 private: 113 uint64_t f_;
112 static const uint64_t kUint64MSB = UINT64_2PART_C(0x80000000, 00000000); 114 int e_;
113 115 };
114 uint64_t f_;
115 int e_;
116 };
117 116
118 } // namespace double_conversion 117 } // namespace double_conversion
119 118
120 } // namespace WTF 119 } // namespace WTF
121 120
122 #endif // DOUBLE_CONVERSION_DIY_FP_H_ 121 #endif // DOUBLE_CONVERSION_DIY_FP_H_
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