libcxx/test/benchmarks/GenerateInput.h

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #ifndef BENCHMARK_GENERATE_INPUT_H
  10 #define BENCHMARK_GENERATE_INPUT_H
  11
  12 #include <algorithm>
  13 #include <climits>
  14 #include <cstddef>
  15 #include <random>
  16 #include <string>
  17 #include <vector>
  18
  19 static const char Letters[] = {
  20     '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K',
  21     'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
  22     'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'};
  23 static const std::size_t LettersSize = sizeof(Letters);
  24
  25 inline std::default_random_engine& getRandomEngine() {
  26   static std::default_random_engine RandEngine(std::random_device{}());
  27   return RandEngine;
  28 }
  29
  30 inline char getRandomChar() {
  31   std::uniform_int_distribution<> LettersDist(0, LettersSize - 1);
  32   return Letters[LettersDist(getRandomEngine())];
  33 }
  34
  35 template <class IntT>
  36 inline IntT getRandomInteger(IntT Min, IntT Max) {
  37   std::uniform_int_distribution<unsigned long long> dist(Min, Max);
  38   return static_cast<IntT>(dist(getRandomEngine()));
  39 }
  40
  41 inline std::string getRandomString(std::size_t Len) {
  42   std::string str(Len, 0);
  43   std::generate_n(str.begin(), Len, &getRandomChar);
  44   return str;
  45 }
  46
  47 template <class IntT>
  48 inline std::vector<IntT> getDuplicateIntegerInputs(std::size_t N) {
  49   std::vector<IntT> inputs(N, static_cast<IntT>(-1));
  50   return inputs;
  51 }
  52
  53 template <class IntT>
  54 inline std::vector<IntT> getSortedIntegerInputs(std::size_t N) {
  55   std::vector<IntT> inputs;
  56   inputs.reserve(N);
  57   for (std::size_t i = 0; i < N; i += 1)
  58     inputs.push_back(i);
  59   return inputs;
  60 }
  61
  62 template <class IntT>
  63 std::vector<IntT> getSortedLargeIntegerInputs(std::size_t N) {
  64   std::vector<IntT> inputs;
  65   inputs.reserve(N);
  66   for (std::size_t i = 0; i < N; ++i)
  67     inputs.push_back(i + N);
  68   return inputs;
  69 }
  70
  71 template <class IntT>
  72 std::vector<IntT> getSortedTopBitsIntegerInputs(std::size_t N) {
  73   std::vector<IntT> inputs = getSortedIntegerInputs<IntT>(N);
  74   for (auto& E : inputs)
  75     E <<= ((sizeof(IntT) / 2) * CHAR_BIT);
  76   return inputs;
  77 }
  78
  79 template <class IntT>
  80 inline std::vector<IntT> getReverseSortedIntegerInputs(std::size_t N) {
  81   std::vector<IntT> inputs;
  82   inputs.reserve(N);
  83   std::size_t i = N;
  84   while (i > 0) {
  85     --i;
  86     inputs.push_back(i);
  87   }
  88   return inputs;
  89 }
  90
  91 template <class IntT>
  92 std::vector<IntT> getPipeOrganIntegerInputs(std::size_t N) {
  93   std::vector<IntT> v;
  94   v.reserve(N);
  95   for (std::size_t i = 0; i < N / 2; ++i)
  96     v.push_back(i);
  97   for (std::size_t i = N / 2; i < N; ++i)
  98     v.push_back(N - i);
  99   return v;
 100 }
 101
 102 template <class IntT>
 103 std::vector<IntT> getRandomIntegerInputs(std::size_t N) {
 104   std::vector<IntT> inputs;
 105   inputs.reserve(N);
 106   for (std::size_t i = 0; i < N; ++i)
 107     inputs.push_back(getRandomInteger<IntT>(0, std::numeric_limits<IntT>::max()));
 108   return inputs;
 109 }
 110
 111 inline std::vector<std::string> getDuplicateStringInputs(std::size_t N) {
 112   std::vector<std::string> inputs(N, getRandomString(1024));
 113   return inputs;
 114 }
 115
 116 inline std::vector<std::string> getRandomStringInputs(std::size_t N) {
 117   std::vector<std::string> inputs;
 118   inputs.reserve(N);
 119   for (std::size_t i = 0; i < N; ++i)
 120     inputs.push_back(getRandomString(1024));
 121   return inputs;
 122 }
 123
 124 inline std::vector<std::string> getPrefixedRandomStringInputs(std::size_t N) {
 125   std::vector<std::string> inputs;
 126   inputs.reserve(N);
 127   constexpr int kSuffixLength = 32;
 128   const std::string prefix    = getRandomString(1024 - kSuffixLength);
 129   for (std::size_t i = 0; i < N; ++i)
 130     inputs.push_back(prefix + getRandomString(kSuffixLength));
 131   return inputs;
 132 }
 133
 134 inline std::vector<std::string> getSortedStringInputs(std::size_t N) {
 135   std::vector<std::string> inputs = getRandomStringInputs(N);
 136   std::sort(inputs.begin(), inputs.end());
 137   return inputs;
 138 }
 139
 140 inline std::vector<std::string> getReverseSortedStringInputs(std::size_t N) {
 141   std::vector<std::string> inputs = getSortedStringInputs(N);
 142   std::reverse(inputs.begin(), inputs.end());
 143   return inputs;
 144 }
 145
 146 inline std::vector<const char*> getRandomCStringInputs(std::size_t N) {
 147   static std::vector<std::string> inputs = getRandomStringInputs(N);
 148   std::vector<const char*> cinputs;
 149   for (auto const& str : inputs)
 150     cinputs.push_back(str.c_str());
 151   return cinputs;
 152 }
 153
 154 #endif // BENCHMARK_GENERATE_INPUT_H