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Diffstat (limited to '')
| -rw-r--r-- | src/rapidjson/test/perftest/misctest.cpp | 974 |
1 files changed, 974 insertions, 0 deletions
diff --git a/src/rapidjson/test/perftest/misctest.cpp b/src/rapidjson/test/perftest/misctest.cpp new file mode 100644 index 000000000..aac847784 --- /dev/null +++ b/src/rapidjson/test/perftest/misctest.cpp @@ -0,0 +1,974 @@ +// Tencent is pleased to support the open source community by making RapidJSON available. +// +// Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip. All rights reserved. +// +// Licensed under the MIT License (the "License"); you may not use this file except +// in compliance with the License. You may obtain a copy of the License at +// +// http://opensource.org/licenses/MIT +// +// Unless required by applicable law or agreed to in writing, software distributed +// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR +// CONDITIONS OF ANY KIND, either express or implied. See the License for the +// specific language governing permissions and limitations under the License. + +#include "perftest.h" + +#if TEST_MISC + +#define __STDC_FORMAT_MACROS +#include "rapidjson/stringbuffer.h" + +#define protected public +#include "rapidjson/writer.h" +#undef private + +class Misc : public PerfTest { +}; + +// Copyright (c) 2008-2010 Bjoern Hoehrmann <bjoern@hoehrmann.de> +// See http://bjoern.hoehrmann.de/utf-8/decoder/dfa/ for details. + +#define UTF8_ACCEPT 0 +#define UTF8_REJECT 12 + +static const unsigned char utf8d[] = { + // The first part of the table maps bytes to character classes that + // to reduce the size of the transition table and create bitmasks. + 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, + 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, + 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, + 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, + 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, + 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, + 8,8,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, + 10,3,3,3,3,3,3,3,3,3,3,3,3,4,3,3, 11,6,6,6,5,8,8,8,8,8,8,8,8,8,8,8, + + // The second part is a transition table that maps a combination + // of a state of the automaton and a character class to a state. + 0,12,24,36,60,96,84,12,12,12,48,72, 12,12,12,12,12,12,12,12,12,12,12,12, + 12, 0,12,12,12,12,12, 0,12, 0,12,12, 12,24,12,12,12,12,12,24,12,24,12,12, + 12,12,12,12,12,12,12,24,12,12,12,12, 12,24,12,12,12,12,12,12,12,24,12,12, + 12,12,12,12,12,12,12,36,12,36,12,12, 12,36,12,12,12,12,12,36,12,36,12,12, + 12,36,12,12,12,12,12,12,12,12,12,12, +}; + +static unsigned inline decode(unsigned* state, unsigned* codep, unsigned byte) { + unsigned type = utf8d[byte]; + + *codep = (*state != UTF8_ACCEPT) ? + (byte & 0x3fu) | (*codep << 6) : + (0xff >> type) & (byte); + + *state = utf8d[256 + *state + type]; + return *state; +} + +static bool IsUTF8(unsigned char* s) { + unsigned codepoint, state = 0; + + while (*s) + decode(&state, &codepoint, *s++); + + return state == UTF8_ACCEPT; +} + +TEST_F(Misc, Hoehrmann_IsUTF8) { + for (size_t i = 0; i < kTrialCount; i++) { + EXPECT_TRUE(IsUTF8((unsigned char*)json_)); + } +} + +//////////////////////////////////////////////////////////////////////////////// +// CountDecimalDigit: Count number of decimal places + +inline unsigned CountDecimalDigit_naive(unsigned n) { + unsigned count = 1; + while (n >= 10) { + n /= 10; + count++; + } + return count; +} + +inline unsigned CountDecimalDigit_enroll4(unsigned n) { + unsigned count = 1; + while (n >= 10000) { + n /= 10000u; + count += 4; + } + if (n < 10) return count; + if (n < 100) return count + 1; + if (n < 1000) return count + 2; + return count + 3; +} + +inline unsigned CountDecimalDigit64_enroll4(uint64_t n) { + unsigned count = 1; + while (n >= 10000) { + n /= 10000u; + count += 4; + } + if (n < 10) return count; + if (n < 100) return count + 1; + if (n < 1000) return count + 2; + return count + 3; +} + +inline unsigned CountDecimalDigit_fast(unsigned n) { + static const uint32_t powers_of_10[] = { + 0, + 10, + 100, + 1000, + 10000, + 100000, + 1000000, + 10000000, + 100000000, + 1000000000 + }; + +#if defined(_M_IX86) || defined(_M_X64) + unsigned long i = 0; + _BitScanReverse(&i, n | 1); + uint32_t t = (i + 1) * 1233 >> 12; +#elif defined(__GNUC__) + uint32_t t = (32 - __builtin_clz(n | 1)) * 1233 >> 12; +#else +#error +#endif + return t - (n < powers_of_10[t]) + 1; +} + +inline unsigned CountDecimalDigit64_fast(uint64_t n) { + static const uint64_t powers_of_10[] = { + 0, + 10, + 100, + 1000, + 10000, + 100000, + 1000000, + 10000000, + 100000000, + 1000000000, + 10000000000, + 100000000000, + 1000000000000, + 10000000000000, + 100000000000000, + 1000000000000000, + 10000000000000000, + 100000000000000000, + 1000000000000000000, + 10000000000000000000U + }; + +#if defined(_M_IX86) + uint64_t m = n | 1; + unsigned long i = 0; + if (_BitScanReverse(&i, m >> 32)) + i += 32; + else + _BitScanReverse(&i, m & 0xFFFFFFFF); + uint32_t t = (i + 1) * 1233 >> 12; +#elif defined(_M_X64) + unsigned long i = 0; + _BitScanReverse64(&i, n | 1); + uint32_t t = (i + 1) * 1233 >> 12; +#elif defined(__GNUC__) + uint32_t t = (64 - __builtin_clzll(n | 1)) * 1233 >> 12; +#else +#error +#endif + + return t - (n < powers_of_10[t]) + 1; +} + +#if 0 +// Exhaustive, very slow +TEST_F(Misc, CountDecimalDigit_Verify) { + unsigned i = 0; + do { + if (i % (65536 * 256) == 0) + printf("%u\n", i); + ASSERT_EQ(CountDecimalDigit_enroll4(i), CountDecimalDigit_fast(i)); + i++; + } while (i != 0); +} + +static const unsigned kDigits10Trial = 1000000000u; +TEST_F(Misc, CountDecimalDigit_naive) { + unsigned sum = 0; + for (unsigned i = 0; i < kDigits10Trial; i++) + sum += CountDecimalDigit_naive(i); + printf("%u\n", sum); +} + +TEST_F(Misc, CountDecimalDigit_enroll4) { + unsigned sum = 0; + for (unsigned i = 0; i < kDigits10Trial; i++) + sum += CountDecimalDigit_enroll4(i); + printf("%u\n", sum); +} + +TEST_F(Misc, CountDecimalDigit_fast) { + unsigned sum = 0; + for (unsigned i = 0; i < kDigits10Trial; i++) + sum += CountDecimalDigit_fast(i); + printf("%u\n", sum); +} +#endif + +TEST_F(Misc, CountDecimalDigit64_VerifyFast) { + uint64_t i = 1, j; + do { + //printf("%" PRIu64 "\n", i); + ASSERT_EQ(CountDecimalDigit64_enroll4(i), CountDecimalDigit64_fast(i)); + j = i; + i *= 3; + } while (j < i); +} + +//////////////////////////////////////////////////////////////////////////////// +// integer-to-string conversion + +// https://gist.github.com/anonymous/7179097 +static const int randval[] ={ + 936116, 369532, 453755, -72860, 209713, 268347, 435278, -360266, -416287, -182064, + -644712, 944969, 640463, -366588, 471577, -69401, -744294, -505829, 923883, 831785, + -601136, -636767, -437054, 591718, 100758, 231907, -719038, 973540, -605220, 506659, + -871653, 462533, 764843, -919138, 404305, -630931, -288711, -751454, -173726, -718208, + 432689, -281157, 360737, 659827, 19174, -376450, 769984, -858198, 439127, 734703, + -683426, 7, 386135, 186997, -643900, -744422, -604708, -629545, 42313, -933592, + -635566, 182308, 439024, -367219, -73924, -516649, 421935, -470515, 413507, -78952, + -427917, -561158, 737176, 94538, 572322, 405217, 709266, -357278, -908099, -425447, + 601119, 750712, -862285, -177869, 900102, 384877, 157859, -641680, 503738, -702558, + 278225, 463290, 268378, -212840, 580090, 347346, -473985, -950968, -114547, -839893, + -738032, -789424, 409540, 493495, 432099, 119755, 905004, -174834, 338266, 234298, + 74641, -965136, -754593, 685273, 466924, 920560, 385062, 796402, -67229, 994864, + 376974, 299869, -647540, -128724, 469890, -163167, -547803, -743363, 486463, -621028, + 612288, 27459, -514224, 126342, -66612, 803409, -777155, -336453, -284002, 472451, + 342390, -163630, 908356, -456147, -825607, 268092, -974715, 287227, 227890, -524101, + 616370, -782456, 922098, -624001, -813690, 171605, -192962, 796151, 707183, -95696, + -23163, -721260, 508892, 430715, 791331, 482048, -996102, 863274, 275406, -8279, + -556239, -902076, 268647, -818565, 260069, -798232, -172924, -566311, -806503, -885992, + 813969, -78468, 956632, 304288, 494867, -508784, 381751, 151264, 762953, 76352, + 594902, 375424, 271700, -743062, 390176, 924237, 772574, 676610, 435752, -153847, + 3959, -971937, -294181, -538049, -344620, -170136, 19120, -703157, 868152, -657961, + -818631, 219015, -872729, -940001, -956570, 880727, -345910, 942913, -942271, -788115, + 225294, 701108, -517736, -416071, 281940, 488730, 942698, 711494, 838382, -892302, + -533028, 103052, 528823, 901515, 949577, 159364, 718227, -241814, -733661, -462928, + -495829, 165170, 513580, -629188, -509571, -459083, 198437, 77198, -644612, 811276, + -422298, -860842, -52584, 920369, 686424, -530667, -243476, 49763, 345866, -411960, + -114863, 470810, -302860, 683007, -509080, 2, -174981, -772163, -48697, 447770, + -268246, 213268, 269215, 78810, -236340, -639140, -864323, 505113, -986569, -325215, + 541859, 163070, -819998, -645161, -583336, 573414, 696417, -132375, 3, -294501, + 320435, 682591, 840008, 351740, 426951, 609354, 898154, -943254, 227321, -859793, + -727993, 44137, -497965, -782239, 14955, -746080, -243366, 9837, -233083, 606507, + -995864, -615287, -994307, 602715, 770771, -315040, 610860, 446102, -307120, 710728, + -590392, -230474, -762625, -637525, 134963, -202700, -766902, -985541, 218163, 682009, + 926051, 525156, -61195, 403211, -810098, 245539, -431733, 179998, -806533, 745943, + 447597, 131973, -187130, 826019, 286107, -937230, -577419, 20254, 681802, -340500, + 323080, 266283, -667617, 309656, 416386, 611863, 759991, -534257, 523112, -634892, + -169913, -204905, -909867, -882185, -944908, 741811, -717675, 967007, -317396, 407230, + -412805, 792905, 994873, 744793, -456797, 713493, 355232, 116900, -945199, 880539, + 342505, -580824, -262273, 982968, -349497, -735488, 311767, -455191, 570918, 389734, + -958386, 10262, -99267, 155481, 304210, 204724, 704367, -144893, -233664, -671441, + 896849, 408613, 762236, 322697, 981321, 688476, 13663, -970704, -379507, 896412, + 977084, 348869, 875948, 341348, 318710, 512081, 6163, 669044, 833295, 811883, + 708756, -802534, -536057, 608413, -389625, -694603, 541106, -110037, 720322, -540581, + 645420, 32980, 62442, 510157, -981870, -87093, -325960, -500494, -718291, -67889, + 991501, 374804, 769026, -978869, 294747, 714623, 413327, -199164, 671368, 804789, + -362507, 798196, -170790, -568895, -869379, 62020, -316693, -837793, 644994, -39341, + -417504, -243068, -957756, 99072, 622234, -739992, 225668, 8863, -505910, 82483, + -559244, 241572, 1315, -36175, -54990, 376813, -11, 162647, -688204, -486163, + -54934, -197470, 744223, -762707, 732540, 996618, 351561, -445933, -898491, 486531, + 456151, 15276, 290186, -817110, -52995, 313046, -452533, -96267, 94470, -500176, + -818026, -398071, -810548, -143325, -819741, 1338, -897676, -101577, -855445, 37309, + 285742, 953804, -777927, -926962, -811217, -936744, -952245, -802300, -490188, -964953, + -552279, 329142, -570048, -505756, 682898, -381089, -14352, 175138, 152390, -582268, + -485137, 717035, 805329, 239572, -730409, 209643, -184403, -385864, 675086, 819648, + 629058, -527109, -488666, -171981, 532788, 552441, 174666, 984921, 766514, 758787, + 716309, 338801, -978004, -412163, 876079, -734212, 789557, -160491, -522719, 56644, + -991, -286038, -53983, 663740, 809812, 919889, -717502, -137704, 220511, 184396, + -825740, -588447, 430870, 124309, 135956, 558662, -307087, -788055, -451328, 812260, + 931601, 324347, -482989, -117858, -278861, 189068, -172774, 929057, 293787, 198161, + -342386, -47173, 906555, -759955, -12779, 777604, -97869, 899320, 927486, -25284, + -848550, 259450, -485856, -17820, 88, 171400, 235492, -326783, -340793, 886886, + 112428, -246280, 5979, 648444, -114982, 991013, -56489, -9497, 419706, 632820, + -341664, 393926, -848977, -22538, 257307, 773731, -905319, 491153, 734883, -868212, + -951053, 644458, -580758, 764735, 584316, 297077, 28852, -397710, -953669, 201772, + 879050, -198237, -588468, 448102, -116837, 770007, -231812, 642906, -582166, -885828, + 9, 305082, -996577, 303559, 75008, -772956, -447960, 599825, -295552, 870739, + -386278, -950300, 485359, -457081, 629461, -850276, 550496, -451755, -620841, -11766, + -950137, 832337, 28711, -273398, -507197, 91921, -271360, -705991, -753220, -388968, + 967945, 340434, -320883, -662793, -554617, -574568, 477946, -6148, -129519, 689217, + 920020, -656315, -974523, -212525, 80921, -612532, 645096, 545655, 655713, -591631, + -307385, -816688, -618823, -113713, 526430, 673063, 735916, -809095, -850417, 639004, + 432281, -388185, 270708, 860146, -39902, -786157, -258180, -246169, -966720, -264957, + 548072, -306010, -57367, -635665, 933824, 70553, -989936, -488741, 72411, -452509, + 529831, 956277, 449019, -577850, -360986, -803418, 48833, 296073, 203430, 609591, + 715483, 470964, 658106, -718254, -96424, 790163, 334739, 181070, -373578, 5, + -435088, 329841, 330939, -256602, 394355, 912412, 231910, 927278, -661933, 788539, + -769664, -893274, -96856, 298205, 901043, -608122, -527430, 183618, -553963, -35246, + -393924, 948832, -483198, 594501, 35460, -407007, 93494, -336881, -634072, 984205, + -812161, 944664, -31062, 753872, 823933, -69566, 50445, 290147, 85134, 34706, + 551902, 405202, -991246, -84642, 154341, 316432, -695101, -651588, -5030, 137564, + -294665, 332541, 528307, -90572, -344923, 523766, -758498, -968047, 339028, 494578, + 593129, -725773, 31834, -718406, -208638, 159665, -2043, 673344, -442767, 75816, + 755442, 769257, -158730, -410272, 691688, 589550, -878398, -184121, 460679, 346312, + 294163, -544602, 653308, 254167, -276979, 52073, -892684, 887653, -41222, 983065, + -68258, -408799, -99069, -674069, -863635, -32890, 622757, -743862, 40872, -4837, + -967228, 522370, -903951, -818669, 524459, 514702, 925801, 20007, -299229, 579348, + 626021, 430089, 348139, -562692, -607728, -130606, -928451, -424793, -458647, -448892, + -312230, 143337, 109746, 880042, -339658, -785614, 938995, 540916, 118429, 661351, + -402967, 404729, -40918, -976535, 743230, 713110, 440182, -381314, -499252, 74613, + 193652, 912717, 491323, 583633, 324691, 459397, 281253, 195540, -2764, -888651, + 892449, 132663, -478373, -430002, -314551, 527826, 247165, 557966, 554778, 481531, + -946634, 431685, -769059, -348371, 174046, 184597, -354867, 584422, 227390, -850397, + -542924, -849093, -737769, 325359, 736314, 269101, 767940, 674809, 81413, -447458, + 445076, 189072, 906218, 502688, -718476, -863827, -731381, 100660, 623249, 710008, + 572060, 922203, 685740, 55096, 263394, -243695, -353910, -516788, 388471, 455165, + 844103, -643772, 363976, 268875, -899450, 104470, 104029, -238874, -274659, 732969, + -676443, 953291, -916289, -861849, -242344, 958083, -479593, -970395, 799831, 277841, + -243236, -283462, -201510, 166263, -259105, -575706, 878926, 891064, 895297, 655262, + -34807, -809833, -89281, 342585, 554920, 1, 902141, -333425, 139703, 852318, + -618438, 329498, -932596, -692836, -513372, 733656, -523411, 85779, 500478, -682697, + -502836, 138776, 156341, -420037, -557964, -556378, 710993, -50383, -877159, 916334, + 132996, 583516, -603392, -111615, -12288, -780214, 476780, 123327, 137607, 519956, + 745837, 17358, -158581, -53490 +}; +static const size_t randvalCount = sizeof(randval) / sizeof(randval[0]); +static const size_t kItoaTrialCount = 10000; + +static const char digits[201] = +"0001020304050607080910111213141516171819" +"2021222324252627282930313233343536373839" +"4041424344454647484950515253545556575859" +"6061626364656667686970717273747576777879" +"8081828384858687888990919293949596979899"; + +// Prevent code being optimized out +//#define OUTPUT_LENGTH(length) printf("", length) +#define OUTPUT_LENGTH(length) printf("%u\n", (unsigned)length) + +template<typename OutputStream> +class Writer1 { +public: + Writer1() : os_() {} + Writer1(OutputStream& os) : os_(&os) {} + + void Reset(OutputStream& os) { + os_ = &os; + } + + bool WriteInt(int i) { + if (i < 0) { + os_->Put('-'); + i = -i; + } + return WriteUint((unsigned)i); + } + + bool WriteUint(unsigned u) { + char buffer[10]; + char *p = buffer; + do { + *p++ = char(u % 10) + '0'; + u /= 10; + } while (u > 0); + + do { + --p; + os_->Put(*p); + } while (p != buffer); + return true; + } + + bool WriteInt64(int64_t i64) { + if (i64 < 0) { + os_->Put('-'); + i64 = -i64; + } + WriteUint64((uint64_t)i64); + return true; + } + + bool WriteUint64(uint64_t u64) { + char buffer[20]; + char *p = buffer; + do { + *p++ = char(u64 % 10) + '0'; + u64 /= 10; + } while (u64 > 0); + + do { + --p; + os_->Put(*p); + } while (p != buffer); + return true; + } + +private: + OutputStream* os_; +}; + +template<> +bool Writer1<rapidjson::StringBuffer>::WriteUint(unsigned u) { + char buffer[10]; + char* p = buffer; + do { + *p++ = char(u % 10) + '0'; + u /= 10; + } while (u > 0); + + char* d = os_->Push(p - buffer); + do { + --p; + *d++ = *p; + } while (p != buffer); + return true; +} + +// Using digits LUT to reduce divsion/modulo +template<typename OutputStream> +class Writer2 { +public: + Writer2() : os_() {} + Writer2(OutputStream& os) : os_(&os) {} + + void Reset(OutputStream& os) { + os_ = &os; + } + + bool WriteInt(int i) { + if (i < 0) { + os_->Put('-'); + i = -i; + } + return WriteUint((unsigned)i); + } + + bool WriteUint(unsigned u) { + char buffer[10]; + char* p = buffer; + while (u >= 100) { + const unsigned i = (u % 100) << 1; + u /= 100; + *p++ = digits[i + 1]; + *p++ = digits[i]; + } + if (u < 10) + *p++ = char(u) + '0'; + else { + const unsigned i = u << 1; + *p++ = digits[i + 1]; + *p++ = digits[i]; + } + + do { + --p; + os_->Put(*p); + } while (p != buffer); + return true; + } + + bool WriteInt64(int64_t i64) { + if (i64 < 0) { + os_->Put('-'); + i64 = -i64; + } + WriteUint64((uint64_t)i64); + return true; + } + + bool WriteUint64(uint64_t u64) { + char buffer[20]; + char* p = buffer; + while (u64 >= 100) { + const unsigned i = static_cast<unsigned>(u64 % 100) << 1; + u64 /= 100; + *p++ = digits[i + 1]; + *p++ = digits[i]; + } + if (u64 < 10) + *p++ = char(u64) + '0'; + else { + const unsigned i = static_cast<unsigned>(u64) << 1; + *p++ = digits[i + 1]; + *p++ = digits[i]; + } + + do { + --p; + os_->Put(*p); + } while (p != buffer); + return true; + } + +private: + OutputStream* os_; +}; + +// First pass to count digits +template<typename OutputStream> +class Writer3 { +public: + Writer3() : os_() {} + Writer3(OutputStream& os) : os_(&os) {} + + void Reset(OutputStream& os) { + os_ = &os; + } + + bool WriteInt(int i) { + if (i < 0) { + os_->Put('-'); + i = -i; + } + return WriteUint((unsigned)i); + } + + bool WriteUint(unsigned u) { + char buffer[10]; + char *p = buffer; + do { + *p++ = char(u % 10) + '0'; + u /= 10; + } while (u > 0); + + do { + --p; + os_->Put(*p); + } while (p != buffer); + return true; + } + + bool WriteInt64(int64_t i64) { + if (i64 < 0) { + os_->Put('-'); + i64 = -i64; + } + WriteUint64((uint64_t)i64); + return true; + } + + bool WriteUint64(uint64_t u64) { + char buffer[20]; + char *p = buffer; + do { + *p++ = char(u64 % 10) + '0'; + u64 /= 10; + } while (u64 > 0); + + do { + --p; + os_->Put(*p); + } while (p != buffer); + return true; + } + +private: + void WriteUintReverse(char* d, unsigned u) { + do { + *--d = char(u % 10) + '0'; + u /= 10; + } while (u > 0); + } + + void WriteUint64Reverse(char* d, uint64_t u) { + do { + *--d = char(u % 10) + '0'; + u /= 10; + } while (u > 0); + } + + OutputStream* os_; +}; + +template<> +inline bool Writer3<rapidjson::StringBuffer>::WriteUint(unsigned u) { + unsigned digit = CountDecimalDigit_fast(u); + WriteUintReverse(os_->Push(digit) + digit, u); + return true; +} + +template<> +inline bool Writer3<rapidjson::InsituStringStream>::WriteUint(unsigned u) { + unsigned digit = CountDecimalDigit_fast(u); + WriteUintReverse(os_->Push(digit) + digit, u); + return true; +} + +template<> +inline bool Writer3<rapidjson::StringBuffer>::WriteUint64(uint64_t u) { + unsigned digit = CountDecimalDigit64_fast(u); + WriteUint64Reverse(os_->Push(digit) + digit, u); + return true; +} + +template<> +inline bool Writer3<rapidjson::InsituStringStream>::WriteUint64(uint64_t u) { + unsigned digit = CountDecimalDigit64_fast(u); + WriteUint64Reverse(os_->Push(digit) + digit, u); + return true; +} + +// Using digits LUT to reduce divsion/modulo, two passes +template<typename OutputStream> +class Writer4 { +public: + Writer4() : os_() {} + Writer4(OutputStream& os) : os_(&os) {} + + void Reset(OutputStream& os) { + os_ = &os; + } + + bool WriteInt(int i) { + if (i < 0) { + os_->Put('-'); + i = -i; + } + return WriteUint((unsigned)i); + } + + bool WriteUint(unsigned u) { + char buffer[10]; + char* p = buffer; + while (u >= 100) { + const unsigned i = (u % 100) << 1; + u /= 100; + *p++ = digits[i + 1]; + *p++ = digits[i]; + } + if (u < 10) + *p++ = char(u) + '0'; + else { + const unsigned i = u << 1; + *p++ = digits[i + 1]; + *p++ = digits[i]; + } + + do { + --p; + os_->Put(*p); + } while (p != buffer); + return true; + } + + bool WriteInt64(int64_t i64) { + if (i64 < 0) { + os_->Put('-'); + i64 = -i64; + } + WriteUint64((uint64_t)i64); + return true; + } + + bool WriteUint64(uint64_t u64) { + char buffer[20]; + char* p = buffer; + while (u64 >= 100) { + const unsigned i = static_cast<unsigned>(u64 % 100) << 1; + u64 /= 100; + *p++ = digits[i + 1]; + *p++ = digits[i]; + } + if (u64 < 10) + *p++ = char(u64) + '0'; + else { + const unsigned i = static_cast<unsigned>(u64) << 1; + *p++ = digits[i + 1]; + *p++ = digits[i]; + } + + do { + --p; + os_->Put(*p); + } while (p != buffer); + return true; + } + +private: + void WriteUintReverse(char* d, unsigned u) { + while (u >= 100) { + const unsigned i = (u % 100) << 1; + u /= 100; + *--d = digits[i + 1]; + *--d = digits[i]; + } + if (u < 10) { + *--d = char(u) + '0'; + } + else { + const unsigned i = u << 1; + *--d = digits[i + 1]; + *--d = digits[i]; + } + } + + void WriteUint64Reverse(char* d, uint64_t u) { + while (u >= 100) { + const unsigned i = (u % 100) << 1; + u /= 100; + *--d = digits[i + 1]; + *--d = digits[i]; + } + if (u < 10) { + *--d = char(u) + '0'; + } + else { + const unsigned i = u << 1; + *--d = digits[i + 1]; + *--d = digits[i]; + } + } + + OutputStream* os_; +}; + +template<> +inline bool Writer4<rapidjson::StringBuffer>::WriteUint(unsigned u) { + unsigned digit = CountDecimalDigit_fast(u); + WriteUintReverse(os_->Push(digit) + digit, u); + return true; +} + +template<> +inline bool Writer4<rapidjson::InsituStringStream>::WriteUint(unsigned u) { + unsigned digit = CountDecimalDigit_fast(u); + WriteUintReverse(os_->Push(digit) + digit, u); + return true; +} + +template<> +inline bool Writer4<rapidjson::StringBuffer>::WriteUint64(uint64_t u) { + unsigned digit = CountDecimalDigit64_fast(u); + WriteUint64Reverse(os_->Push(digit) + digit, u); + return true; +} + +template<> +inline bool Writer4<rapidjson::InsituStringStream>::WriteUint64(uint64_t u) { + unsigned digit = CountDecimalDigit64_fast(u); + WriteUint64Reverse(os_->Push(digit) + digit, u); + return true; +} + +template <typename Writer> +void itoa_Writer_StringBufferVerify() { + rapidjson::StringBuffer sb; + Writer writer(sb); + for (size_t j = 0; j < randvalCount; j++) { + char buffer[32]; + sprintf(buffer, "%d", randval[j]); + writer.WriteInt(randval[j]); + ASSERT_STREQ(buffer, sb.GetString()); + sb.Clear(); + } +} + +template <typename Writer> +void itoa_Writer_InsituStringStreamVerify() { + Writer writer; + for (size_t j = 0; j < randvalCount; j++) { + char buffer[32]; + sprintf(buffer, "%d", randval[j]); + char buffer2[32]; + rapidjson::InsituStringStream ss(buffer2); + writer.Reset(ss); + char* begin = ss.PutBegin(); + writer.WriteInt(randval[j]); + ss.Put('\0'); + ss.PutEnd(begin); + ASSERT_STREQ(buffer, buffer2); + } +} + +template <typename Writer> +void itoa_Writer_StringBuffer() { + size_t length = 0; + + rapidjson::StringBuffer sb; + Writer writer(sb); + + for (size_t i = 0; i < kItoaTrialCount; i++) { + for (size_t j = 0; j < randvalCount; j++) { + writer.WriteInt(randval[j]); + length += sb.GetSize(); + sb.Clear(); + } + } + OUTPUT_LENGTH(length); +} + +template <typename Writer> +void itoa_Writer_InsituStringStream() { + size_t length = 0; + + char buffer[32]; + Writer writer; + for (size_t i = 0; i < kItoaTrialCount; i++) { + for (size_t j = 0; j < randvalCount; j++) { + rapidjson::InsituStringStream ss(buffer); + writer.Reset(ss); + char* begin = ss.PutBegin(); + writer.WriteInt(randval[j]); + length += ss.PutEnd(begin); + } + } + OUTPUT_LENGTH(length); +}; + +template <typename Writer> +void itoa64_Writer_StringBufferVerify() { + rapidjson::StringBuffer sb; + Writer writer(sb); + for (size_t j = 0; j < randvalCount; j++) { + char buffer[32]; + int64_t x = randval[j] * randval[j]; + sprintf(buffer, "%" PRIi64, x); + writer.WriteInt64(x); + ASSERT_STREQ(buffer, sb.GetString()); + sb.Clear(); + } +} + +template <typename Writer> +void itoa64_Writer_InsituStringStreamVerify() { + Writer writer; + for (size_t j = 0; j < randvalCount; j++) { + char buffer[32]; + int64_t x = randval[j] * randval[j]; + sprintf(buffer, "%" PRIi64, x); + char buffer2[32]; + rapidjson::InsituStringStream ss(buffer2); + writer.Reset(ss); + char* begin = ss.PutBegin(); + writer.WriteInt64(x); + ss.Put('\0'); + ss.PutEnd(begin); + ASSERT_STREQ(buffer, buffer2); + } +} + +template <typename Writer> +void itoa64_Writer_StringBuffer() { + size_t length = 0; + + rapidjson::StringBuffer sb; + Writer writer(sb); + + for (size_t i = 0; i < kItoaTrialCount; i++) { + for (size_t j = 0; j < randvalCount; j++) { + writer.WriteInt64(randval[j] * randval[j]); + length += sb.GetSize(); + sb.Clear(); + } + } + OUTPUT_LENGTH(length); +} + +template <typename Writer> +void itoa64_Writer_InsituStringStream() { + size_t length = 0; + + char buffer[32]; + Writer writer; + for (size_t i = 0; i < kItoaTrialCount; i++) { + for (size_t j = 0; j < randvalCount; j++) { + rapidjson::InsituStringStream ss(buffer); + writer.Reset(ss); + char* begin = ss.PutBegin(); + writer.WriteInt64(randval[j] * randval[j]); + length += ss.PutEnd(begin); + } + } + OUTPUT_LENGTH(length); +}; + +// Full specialization for InsituStringStream to prevent memory copying +// (normally we will not use InsituStringStream for writing, just for testing) + +namespace rapidjson { + +template<> +bool rapidjson::Writer<InsituStringStream>::WriteInt(int i) { + char *buffer = os_->Push(11); + const char* end = internal::i32toa(i, buffer); + os_->Pop(11 - (end - buffer)); + return true; +} + +template<> +bool Writer<InsituStringStream>::WriteUint(unsigned u) { + char *buffer = os_->Push(10); + const char* end = internal::u32toa(u, buffer); + os_->Pop(10 - (end - buffer)); + return true; +} + +template<> +bool Writer<InsituStringStream>::WriteInt64(int64_t i64) { + char *buffer = os_->Push(21); + const char* end = internal::i64toa(i64, buffer); + os_->Pop(21 - (end - buffer)); + return true; +} + +template<> +bool Writer<InsituStringStream>::WriteUint64(uint64_t u) { + char *buffer = os_->Push(20); + const char* end = internal::u64toa(u, buffer); + os_->Pop(20 - (end - buffer)); + return true; +} + +} // namespace rapidjson + +TEST_F(Misc, itoa_Writer_StringBufferVerify) { itoa_Writer_StringBufferVerify<rapidjson::Writer<rapidjson::StringBuffer> >(); } +TEST_F(Misc, itoa_Writer1_StringBufferVerify) { itoa_Writer_StringBufferVerify<Writer1<rapidjson::StringBuffer> >(); } +TEST_F(Misc, itoa_Writer2_StringBufferVerify) { itoa_Writer_StringBufferVerify<Writer2<rapidjson::StringBuffer> >(); } +TEST_F(Misc, itoa_Writer3_StringBufferVerify) { itoa_Writer_StringBufferVerify<Writer3<rapidjson::StringBuffer> >(); } +TEST_F(Misc, itoa_Writer4_StringBufferVerify) { itoa_Writer_StringBufferVerify<Writer4<rapidjson::StringBuffer> >(); } +TEST_F(Misc, itoa_Writer_InsituStringStreamVerify) { itoa_Writer_InsituStringStreamVerify<rapidjson::Writer<rapidjson::InsituStringStream> >(); } +TEST_F(Misc, itoa_Writer1_InsituStringStreamVerify) { itoa_Writer_InsituStringStreamVerify<Writer1<rapidjson::InsituStringStream> >(); } +TEST_F(Misc, itoa_Writer2_InsituStringStreamVerify) { itoa_Writer_InsituStringStreamVerify<Writer2<rapidjson::InsituStringStream> >(); } +TEST_F(Misc, itoa_Writer3_InsituStringStreamVerify) { itoa_Writer_InsituStringStreamVerify<Writer3<rapidjson::InsituStringStream> >(); } +TEST_F(Misc, itoa_Writer4_InsituStringStreamVerify) { itoa_Writer_InsituStringStreamVerify<Writer4<rapidjson::InsituStringStream> >(); } +TEST_F(Misc, itoa_Writer_StringBuffer) { itoa_Writer_StringBuffer<rapidjson::Writer<rapidjson::StringBuffer> >(); } +TEST_F(Misc, itoa_Writer1_StringBuffer) { itoa_Writer_StringBuffer<Writer1<rapidjson::StringBuffer> >(); } +TEST_F(Misc, itoa_Writer2_StringBuffer) { itoa_Writer_StringBuffer<Writer2<rapidjson::StringBuffer> >(); } +TEST_F(Misc, itoa_Writer3_StringBuffer) { itoa_Writer_StringBuffer<Writer3<rapidjson::StringBuffer> >(); } +TEST_F(Misc, itoa_Writer4_StringBuffer) { itoa_Writer_StringBuffer<Writer4<rapidjson::StringBuffer> >(); } +TEST_F(Misc, itoa_Writer_InsituStringStream) { itoa_Writer_InsituStringStream<rapidjson::Writer<rapidjson::InsituStringStream> >(); } +TEST_F(Misc, itoa_Writer1_InsituStringStream) { itoa_Writer_InsituStringStream<Writer1<rapidjson::InsituStringStream> >(); } +TEST_F(Misc, itoa_Writer2_InsituStringStream) { itoa_Writer_InsituStringStream<Writer2<rapidjson::InsituStringStream> >(); } +TEST_F(Misc, itoa_Writer3_InsituStringStream) { itoa_Writer_InsituStringStream<Writer3<rapidjson::InsituStringStream> >(); } +TEST_F(Misc, itoa_Writer4_InsituStringStream) { itoa_Writer_InsituStringStream<Writer4<rapidjson::InsituStringStream> >(); } + +TEST_F(Misc, itoa64_Writer_StringBufferVerify) { itoa64_Writer_StringBufferVerify<rapidjson::Writer<rapidjson::StringBuffer> >(); } +TEST_F(Misc, itoa64_Writer1_StringBufferVerify) { itoa64_Writer_StringBufferVerify<Writer1<rapidjson::StringBuffer> >(); } +TEST_F(Misc, itoa64_Writer2_StringBufferVerify) { itoa64_Writer_StringBufferVerify<Writer2<rapidjson::StringBuffer> >(); } +TEST_F(Misc, itoa64_Writer3_StringBufferVerify) { itoa64_Writer_StringBufferVerify<Writer3<rapidjson::StringBuffer> >(); } +TEST_F(Misc, itoa64_Writer4_StringBufferVerify) { itoa64_Writer_StringBufferVerify<Writer4<rapidjson::StringBuffer> >(); } +TEST_F(Misc, itoa64_Writer_InsituStringStreamVerify) { itoa64_Writer_InsituStringStreamVerify<rapidjson::Writer<rapidjson::InsituStringStream> >(); } +TEST_F(Misc, itoa64_Writer1_InsituStringStreamVerify) { itoa64_Writer_InsituStringStreamVerify<Writer1<rapidjson::InsituStringStream> >(); } +TEST_F(Misc, itoa64_Writer2_InsituStringStreamVerify) { itoa64_Writer_InsituStringStreamVerify<Writer2<rapidjson::InsituStringStream> >(); } +TEST_F(Misc, itoa64_Writer3_InsituStringStreamVerify) { itoa64_Writer_InsituStringStreamVerify<Writer3<rapidjson::InsituStringStream> >(); } +TEST_F(Misc, itoa64_Writer4_InsituStringStreamVerify) { itoa64_Writer_InsituStringStreamVerify<Writer4<rapidjson::InsituStringStream> >(); } +TEST_F(Misc, itoa64_Writer_StringBuffer) { itoa64_Writer_StringBuffer<rapidjson::Writer<rapidjson::StringBuffer> >(); } +TEST_F(Misc, itoa64_Writer1_StringBuffer) { itoa64_Writer_StringBuffer<Writer1<rapidjson::StringBuffer> >(); } +TEST_F(Misc, itoa64_Writer2_StringBuffer) { itoa64_Writer_StringBuffer<Writer2<rapidjson::StringBuffer> >(); } +TEST_F(Misc, itoa64_Writer3_StringBuffer) { itoa64_Writer_StringBuffer<Writer3<rapidjson::StringBuffer> >(); } +TEST_F(Misc, itoa64_Writer4_StringBuffer) { itoa64_Writer_StringBuffer<Writer4<rapidjson::StringBuffer> >(); } +TEST_F(Misc, itoa64_Writer_InsituStringStream) { itoa64_Writer_InsituStringStream<rapidjson::Writer<rapidjson::InsituStringStream> >(); } +TEST_F(Misc, itoa64_Writer1_InsituStringStream) { itoa64_Writer_InsituStringStream<Writer1<rapidjson::InsituStringStream> >(); } +TEST_F(Misc, itoa64_Writer2_InsituStringStream) { itoa64_Writer_InsituStringStream<Writer2<rapidjson::InsituStringStream> >(); } +TEST_F(Misc, itoa64_Writer3_InsituStringStream) { itoa64_Writer_InsituStringStream<Writer3<rapidjson::InsituStringStream> >(); } +TEST_F(Misc, itoa64_Writer4_InsituStringStream) { itoa64_Writer_InsituStringStream<Writer4<rapidjson::InsituStringStream> >(); } + +#endif // TEST_MISC |