Source/WTF/wtf/dtoa/cached-powers.cc - Issue 14238015: Move Source/WTF/wtf to Source/wtf

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Issue 14238015: Move Source/WTF/wtf to Source/wtf (Closed) Base URL: svn://svn.chromium.org/blink/trunk

Patch Set: Created 7 years, 8 months ago

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1 // Copyright 2006-2008 the V8 project authors. All rights reserved.

2 // Redistribution and use in source and binary forms, with or without

3 // modification, are permitted provided that the following conditions are

4 // met:

5 //

6 // * Redistributions of source code must retain the above copyright

7 // notice, this list of conditions and the following disclaimer.

8 // * Redistributions in binary form must reproduce the above

9 // copyright notice, this list of conditions and the following

10 // disclaimer in the documentation and/or other materials provided

11 // with the distribution.

12 // * Neither the name of Google Inc. nor the names of its

13 // contributors may be used to endorse or promote products derived

14 // from this software without specific prior written permission.

15 //

16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

27

28 #include "config.h"

29

30 #include <stdarg.h>

31 #include <limits.h>

32 #include <math.h>

33

34 #include "UnusedParam.h"

35 #include "utils.h"

36 #include "cached-powers.h"

37

38 namespace WTF {

39

40 namespace double_conversion {

41

42 struct CachedPower {

43 uint64_t significand;

44 int16_t binary_exponent;

45 int16_t decimal_exponent;

46 };

47

48 static int kCachedPowersLength = 1;

49 static int kCachedPowersOffset = 1;

50 static const double kD_1_LOG2_10 = 0.30102999566398114; // 1 / lg(10)

51 static CachedPower* kCachedPowers = 0;

52

53 int PowersOfTenCache::kDecimalExponentDistance = 1;

54 int PowersOfTenCache::kMinDecimalExponent = 1;

55 int PowersOfTenCache::kMaxDecimalExponent = 1;

56

57 void initialize() {

58 if (kCachedPowers)

59 return;

60 static CachedPower cachedPowers[] = {

61 {UINT64_2PART_C(0xfa8fd5a0, 081c0288), -1220, -348},

62 {UINT64_2PART_C(0xbaaee17f, a23ebf76), -1193, -340},

63 {UINT64_2PART_C(0x8b16fb20, 3055ac76), -1166, -332},

64 {UINT64_2PART_C(0xcf42894a, 5dce35ea), -1140, -324},

65 {UINT64_2PART_C(0x9a6bb0aa, 55653b2d), -1113, -316},

66 {UINT64_2PART_C(0xe61acf03, 3d1a45df), -1087, -308},

67 {UINT64_2PART_C(0xab70fe17, c79ac6ca), -1060, -300},

68 {UINT64_2PART_C(0xff77b1fc, bebcdc4f), -1034, -292},

69 {UINT64_2PART_C(0xbe5691ef, 416bd60c), -1007, -284},

70 {UINT64_2PART_C(0x8dd01fad, 907ffc3c), -980, -276},

71 {UINT64_2PART_C(0xd3515c28, 31559a83), -954, -268},

72 {UINT64_2PART_C(0x9d71ac8f, ada6c9b5), -927, -260},

73 {UINT64_2PART_C(0xea9c2277, 23ee8bcb), -901, -252},

74 {UINT64_2PART_C(0xaecc4991, 4078536d), -874, -244},

75 {UINT64_2PART_C(0x823c1279, 5db6ce57), -847, -236},

76 {UINT64_2PART_C(0xc2109436, 4dfb5637), -821, -228},

77 {UINT64_2PART_C(0x9096ea6f, 3848984f), -794, -220},

78 {UINT64_2PART_C(0xd77485cb, 25823ac7), -768, -212},

79 {UINT64_2PART_C(0xa086cfcd, 97bf97f4), -741, -204},

80 {UINT64_2PART_C(0xef340a98, 172aace5), -715, -196},

81 {UINT64_2PART_C(0xb23867fb, 2a35b28e), -688, -188},

82 {UINT64_2PART_C(0x84c8d4df, d2c63f3b), -661, -180},

83 {UINT64_2PART_C(0xc5dd4427, 1ad3cdba), -635, -172},

84 {UINT64_2PART_C(0x936b9fce, bb25c996), -608, -164},

85 {UINT64_2PART_C(0xdbac6c24, 7d62a584), -582, -156},

86 {UINT64_2PART_C(0xa3ab6658, 0d5fdaf6), -555, -148},

87 {UINT64_2PART_C(0xf3e2f893, dec3f126), -529, -140},

88 {UINT64_2PART_C(0xb5b5ada8, aaff80b8), -502, -132},

89 {UINT64_2PART_C(0x87625f05, 6c7c4a8b), -475, -124},

90 {UINT64_2PART_C(0xc9bcff60, 34c13053), -449, -116},

91 {UINT64_2PART_C(0x964e858c, 91ba2655), -422, -108},

92 {UINT64_2PART_C(0xdff97724, 70297ebd), -396, -100},

93 {UINT64_2PART_C(0xa6dfbd9f, b8e5b88f), -369, -92},

94 {UINT64_2PART_C(0xf8a95fcf, 88747d94), -343, -84},

95 {UINT64_2PART_C(0xb9447093, 8fa89bcf), -316, -76},

96 {UINT64_2PART_C(0x8a08f0f8, bf0f156b), -289, -68},

97 {UINT64_2PART_C(0xcdb02555, 653131b6), -263, -60},

98 {UINT64_2PART_C(0x993fe2c6, d07b7fac), -236, -52},

99 {UINT64_2PART_C(0xe45c10c4, 2a2b3b06), -210, -44},

100 {UINT64_2PART_C(0xaa242499, 697392d3), -183, -36},

101 {UINT64_2PART_C(0xfd87b5f2, 8300ca0e), -157, -28},

102 {UINT64_2PART_C(0xbce50864, 92111aeb), -130, -20},

103 {UINT64_2PART_C(0x8cbccc09, 6f5088cc), -103, -12},

104 {UINT64_2PART_C(0xd1b71758, e219652c), -77, -4},

105 {UINT64_2PART_C(0x9c400000, 00000000), -50, 4},

106 {UINT64_2PART_C(0xe8d4a510, 00000000), -24, 12},

107 {UINT64_2PART_C(0xad78ebc5, ac620000), 3, 20},

108 {UINT64_2PART_C(0x813f3978, f8940984), 30, 28},

109 {UINT64_2PART_C(0xc097ce7b, c90715b3), 56, 36},

110 {UINT64_2PART_C(0x8f7e32ce, 7bea5c70), 83, 44},

111 {UINT64_2PART_C(0xd5d238a4, abe98068), 109, 52},

112 {UINT64_2PART_C(0x9f4f2726, 179a2245), 136, 60},

113 {UINT64_2PART_C(0xed63a231, d4c4fb27), 162, 68},

114 {UINT64_2PART_C(0xb0de6538, 8cc8ada8), 189, 76},

115 {UINT64_2PART_C(0x83c7088e, 1aab65db), 216, 84},

116 {UINT64_2PART_C(0xc45d1df9, 42711d9a), 242, 92},

117 {UINT64_2PART_C(0x924d692c, a61be758), 269, 100},

118 {UINT64_2PART_C(0xda01ee64, 1a708dea), 295, 108},

119 {UINT64_2PART_C(0xa26da399, 9aef774a), 322, 116},

120 {UINT64_2PART_C(0xf209787b, b47d6b85), 348, 124},

121 {UINT64_2PART_C(0xb454e4a1, 79dd1877), 375, 132},

122 {UINT64_2PART_C(0x865b8692, 5b9bc5c2), 402, 140},

123 {UINT64_2PART_C(0xc83553c5, c8965d3d), 428, 148},

124 {UINT64_2PART_C(0x952ab45c, fa97a0b3), 455, 156},

125 {UINT64_2PART_C(0xde469fbd, 99a05fe3), 481, 164},

126 {UINT64_2PART_C(0xa59bc234, db398c25), 508, 172},

127 {UINT64_2PART_C(0xf6c69a72, a3989f5c), 534, 180},

128 {UINT64_2PART_C(0xb7dcbf53, 54e9bece), 561, 188},

129 {UINT64_2PART_C(0x88fcf317, f22241e2), 588, 196},

130 {UINT64_2PART_C(0xcc20ce9b, d35c78a5), 614, 204},

131 {UINT64_2PART_C(0x98165af3, 7b2153df), 641, 212},

132 {UINT64_2PART_C(0xe2a0b5dc, 971f303a), 667, 220},

133 {UINT64_2PART_C(0xa8d9d153, 5ce3b396), 694, 228},

134 {UINT64_2PART_C(0xfb9b7cd9, a4a7443c), 720, 236},

135 {UINT64_2PART_C(0xbb764c4c, a7a44410), 747, 244},

136 {UINT64_2PART_C(0x8bab8eef, b6409c1a), 774, 252},

137 {UINT64_2PART_C(0xd01fef10, a657842c), 800, 260},

138 {UINT64_2PART_C(0x9b10a4e5, e9913129), 827, 268},

139 {UINT64_2PART_C(0xe7109bfb, a19c0c9d), 853, 276},

140 {UINT64_2PART_C(0xac2820d9, 623bf429), 880, 284},

141 {UINT64_2PART_C(0x80444b5e, 7aa7cf85), 907, 292},

142 {UINT64_2PART_C(0xbf21e440, 03acdd2d), 933, 300},

143 {UINT64_2PART_C(0x8e679c2f, 5e44ff8f), 960, 308},

144 {UINT64_2PART_C(0xd433179d, 9c8cb841), 986, 316},

145 {UINT64_2PART_C(0x9e19db92, b4e31ba9), 1013, 324},

146 {UINT64_2PART_C(0xeb96bf6e, badf77d9), 1039, 332},

147 {UINT64_2PART_C(0xaf87023b, 9bf0ee6b), 1066, 340},

148 };

149 kCachedPowers = cachedPowers;

150 kCachedPowersLength = ARRAY_SIZE(cachedPowers);

151 kCachedPowersOffset = -cachedPowers[0].decimal_exponent;

152 PowersOfTenCache::kDecimalExponentDistance = kCachedPowers[1].decimal_ex ponent - kCachedPowers[0].decimal_exponent;

153 PowersOfTenCache::kMinDecimalExponent = kCachedPowers[0].decimal_exponen t;

154 PowersOfTenCache::kMaxDecimalExponent = kCachedPowers[kCachedPowersLengt h - 1].decimal_exponent;

155 }

156

157 void PowersOfTenCache::GetCachedPowerForBinaryExponentRange(

158 int min_exponent ,

159 int max_exponent ,

160 DiyFp* power,

161 int* decimal_exp onent) {

162 UNUSED_PARAM(max_exponent);

163 int kQ = DiyFp::kSignificandSize;

164 double k = ceil((min_exponent + kQ - 1) * kD_1_LOG2_10);

165 int foo = kCachedPowersOffset;

166 int index =

167 (foo + static_cast<int>(k) - 1) / kDecimalExponentDistance + 1;

168 ASSERT(0 <= index && index < kCachedPowersLength);

169 CachedPower cached_power = kCachedPowers[index];

170 ASSERT(min_exponent <= cached_power.binary_exponent);

171 ASSERT(cached_power.binary_exponent <= max_exponent);

172 *decimal_exponent = cached_power.decimal_exponent;

173 *power = DiyFp(cached_power.significand, cached_power.binary_exponent);

174 }

175

176

177 void PowersOfTenCache::GetCachedPowerForDecimalExponent(int requested_expone nt,

178 DiyFp* power,

179 int* found_exponent) {

180 ASSERT(kMinDecimalExponent <= requested_exponent);

181 ASSERT(requested_exponent < kMaxDecimalExponent + kDecimalExponentDistan ce);

182 int index =

183 (requested_exponent + kCachedPowersOffset) / kDecimalExponentDistance;

184 CachedPower cached_power = kCachedPowers[index];

185 *power = DiyFp(cached_power.significand, cached_power.binary_exponent);

186 *found_exponent = cached_power.decimal_exponent;

187 ASSERT(*found_exponent <= requested_exponent);

188 ASSERT(requested_exponent < *found_exponent + kDecimalExponentDistance);

189 }

190

191 } // namespace double_conversion

192

193 } // namespace WTF

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