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bench_constexpr_map_with_fieldName_cache.cpp
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#include <benchmark/benchmark.h>
#include <iostream>
#include <array>
#include <string_view>
#include <algorithm>
#include <cstring>
#include <functional>
#include <random>
#include <string>
#include <map>
using namespace std::literals::string_view_literals;
auto generate_random_alphanumeric_string(std::size_t len) -> std::string {
static constexpr auto chars =
"0123456789"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz";
std::random_device rd; //Will be used to obtain a seed for the random number engine
std::mt19937 gen(rd()); //Standard mersenne_twister_engine seeded with rd()
auto dist = std::uniform_int_distribution{{}, std::strlen(chars) - 1};
auto result = std::string(len, '\0');
std::generate_n(begin(result), len, [&]() { return chars[dist(gen)]; });
return result;
}
auto makeVector(std::size_t len) -> std::vector<std::string> {
std::vector<std::string> vectorOfStrings(len);
auto genString = []() {
std::random_device rd;
std::mt19937 gen(rd());
std::uniform_int_distribution<> dist(1, 20);
return generate_random_alphanumeric_string(dist(gen));
};
std::generate(vectorOfStrings.begin(), vectorOfStrings.end(), genString);
vectorOfStrings[0] = "a";
vectorOfStrings[1] = "b";
vectorOfStrings[2] = "c";
vectorOfStrings[3] = "d";
vectorOfStrings[4] = "e";
vectorOfStrings[5] = "f";
vectorOfStrings[6] = "g";
vectorOfStrings[7] = "h";
vectorOfStrings[8] = "i";
vectorOfStrings[9] = "j";
vectorOfStrings[10] = "A";
vectorOfStrings[11] = "X";
vectorOfStrings[55] = "u";
vectorOfStrings[56] = "l";
return vectorOfStrings;
}
static void NoCache(benchmark::State& state) {
std::vector<std::string> vectorOfStrings = makeVector(100);
for (auto _ : state) {
constexpr size_t manualFixSize = 52;
static constexpr std::array<std::pair<std::string_view, std::string_view>, manualFixSize > manualFixPairs {
{
{"a"sv, "A"sv},
{"b"sv, "B"sv},
{"c"sv, "C"sv},
{"d"sv, "C"sv},
{"e"sv, "C"sv},
{"f"sv, "C"sv},
{"g"sv, "C"sv},
{"h"sv, "C"sv},
{"i"sv, "C"sv},
{"j"sv, "C"sv},
{"k"sv, "C"sv},
{"l"sv, "C"sv},
{"m"sv, "C"sv},
{"n"sv, "C"sv},
{"o"sv, "C"sv},
{"p"sv, "C"sv},
{"q"sv, "C"sv},
{"r"sv, "C"sv},
{"s"sv, "C"sv},
{"t"sv, "C"sv},
{"u"sv, "C"sv},
{"v"sv, "C"sv},
{"w"sv, "C"sv},
{"x"sv, "C"sv},
{"y"sv, "C"sv},
{"z"sv, "C"sv},
{"A"sv, "A"sv},
{"B"sv, "B"sv},
{"C"sv, "C"sv},
{"D"sv, "C"sv},
{"E"sv, "C"sv},
{"F"sv, "C"sv},
{"G"sv, "C"sv},
{"H"sv, "C"sv},
{"I"sv, "C"sv},
{"J"sv, "C"sv},
{"K"sv, "C"sv},
{"L"sv, "C"sv},
{"M"sv, "C"sv},
{"N"sv, "C"sv},
{"O"sv, "C"sv},
{"P"sv, "C"sv},
{"Q"sv, "C"sv},
{"R"sv, "C"sv},
{"S"sv, "C"sv},
{"T"sv, "C"sv},
{"U"sv, "C"sv},
{"V"sv, "C"sv},
{"W"sv, "C"sv},
{"X"sv, "C"sv},
{"Y"sv, "C"sv},
{"Z"sv, "C"sv}
}
};
std::map<std::string, std::string> fieldNames;
for (const auto& fieldNameInput: vectorOfStrings) {
std::string myval;
if (const auto& cached_value = fieldNames.find(fieldNameInput); cached_value != fieldNames.end()) {
myval = cached_value->second;
continue;
}
const auto cache_value = [&](const auto& input, const auto& value) -> const auto& {
return fieldNames.emplace(input, value).first->second;
};
auto it = std::find_if(manualFixPairs.cbegin(), manualFixPairs.cend(), [&fieldNameInput](const auto& p) { return p.first == fieldNameInput; });
if (it != manualFixPairs.cend()) {
myval = cache_value(fieldNameInput, it->second);
continue;
}
myval = cache_value(fieldNameInput, fieldNameInput);
benchmark::DoNotOptimize(myval);
}
}
}
// Register the function as a benchmark
BENCHMARK(NoCache);
static void WithCache(benchmark::State& state) {
std::vector<std::string> vectorOfStrings = makeVector(100);
for (auto _ : state) {
constexpr size_t manualFixSize = 52;
static constexpr std::array<std::pair<std::string_view, std::string_view>, manualFixSize > manualFixPairs {
{
{"a"sv, "A"sv},
{"b"sv, "B"sv},
{"c"sv, "C"sv},
{"d"sv, "C"sv},
{"e"sv, "C"sv},
{"f"sv, "C"sv},
{"g"sv, "C"sv},
{"h"sv, "C"sv},
{"i"sv, "C"sv},
{"j"sv, "C"sv},
{"k"sv, "C"sv},
{"l"sv, "C"sv},
{"m"sv, "C"sv},
{"n"sv, "C"sv},
{"o"sv, "C"sv},
{"p"sv, "C"sv},
{"q"sv, "C"sv},
{"r"sv, "C"sv},
{"t"sv, "C"sv},
{"u"sv, "C"sv},
{"v"sv, "C"sv},
{"w"sv, "C"sv},
{"x"sv, "C"sv},
{"y"sv, "C"sv},
{"z"sv, "C"sv},
{"A"sv, "A"sv},
{"B"sv, "B"sv},
{"C"sv, "C"sv},
{"D"sv, "C"sv},
{"E"sv, "C"sv},
{"F"sv, "C"sv},
{"G"sv, "C"sv},
{"H"sv, "C"sv},
{"I"sv, "C"sv},
{"J"sv, "C"sv},
{"K"sv, "C"sv},
{"L"sv, "C"sv},
{"M"sv, "C"sv},
{"N"sv, "C"sv},
{"O"sv, "C"sv},
{"P"sv, "C"sv},
{"Q"sv, "C"sv},
{"R"sv, "C"sv},
{"S"sv, "C"sv},
{"T"sv, "C"sv},
{"U"sv, "C"sv},
{"V"sv, "C"sv},
{"W"sv, "C"sv},
{"X"sv, "C"sv},
{"Y"sv, "C"sv},
{"Z"sv, "C"sv}
}
};
std::array<bool, manualFixSize> alreadyDones;
alreadyDones.fill(false);
std::map<std::string, std::string> fieldNames;
for (const auto& fieldNameInput: vectorOfStrings) {
std::string myval;
if (const auto& cached_value = fieldNames.find(fieldNameInput); cached_value != fieldNames.end()) {
myval = cached_value->second;
continue;
}
const auto cache_value = [&](const auto& input, const auto& value) -> const auto& {
return fieldNames.emplace(input, value).first->second;
};
auto it = std::find_if(manualFixPairs.cbegin(), manualFixPairs.cend(),
[&fieldNameInput, &alreadyDones, idx = 0](const auto& p) mutable {
int i = idx++;
if (!alreadyDones[i] && (p.first == fieldNameInput)) {
alreadyDones[i] = true;
return true;
}
return false;
});
if (it != manualFixPairs.cend()) {
myval = cache_value(fieldNameInput, it->second);
continue;
}
myval = cache_value(fieldNameInput, fieldNameInput);
benchmark::DoNotOptimize(myval);
}
}
}
// Register the function as a benchmark
BENCHMARK(WithCache);
static void NotConstexpr(benchmark::State& state) {
std::vector<std::string> vectorOfStrings = makeVector(100);
for (auto _ : state) {
std::map<std::string_view, std::string_view> manualFixPairs
{
{"a"sv, "A"sv},
{"b"sv, "B"sv},
{"c"sv, "C"sv},
{"d"sv, "C"sv},
{"e"sv, "C"sv},
{"f"sv, "C"sv},
{"g"sv, "C"sv},
{"h"sv, "C"sv},
{"i"sv, "C"sv},
{"j"sv, "C"sv},
{"k"sv, "C"sv},
{"l"sv, "C"sv},
{"m"sv, "C"sv},
{"n"sv, "C"sv},
{"o"sv, "C"sv},
{"p"sv, "C"sv},
{"q"sv, "C"sv},
{"r"sv, "C"sv},
{"s"sv, "C"sv},
{"t"sv, "C"sv},
{"u"sv, "C"sv},
{"v"sv, "C"sv},
{"w"sv, "C"sv},
{"x"sv, "C"sv},
{"y"sv, "C"sv},
{"z"sv, "C"sv},
{"A"sv, "A"sv},
{"B"sv, "B"sv},
{"C"sv, "C"sv},
{"D"sv, "C"sv},
{"E"sv, "C"sv},
{"F"sv, "C"sv},
{"G"sv, "C"sv},
{"H"sv, "C"sv},
{"I"sv, "C"sv},
{"J"sv, "C"sv},
{"K"sv, "C"sv},
{"L"sv, "C"sv},
{"M"sv, "C"sv},
{"N"sv, "C"sv},
{"O"sv, "C"sv},
{"P"sv, "C"sv},
{"Q"sv, "C"sv},
{"R"sv, "C"sv},
{"S"sv, "C"sv},
{"T"sv, "C"sv},
{"U"sv, "C"sv},
{"V"sv, "C"sv},
{"W"sv, "C"sv},
{"X"sv, "C"sv},
{"Y"sv, "C"sv},
{"Z"sv, "C"sv}
};
std::map<std::string, std::string> fieldNames;
for (const auto& fieldNameInput: vectorOfStrings) {
std::string myval;
if (const auto& cached_value = fieldNames.find(fieldNameInput); cached_value != fieldNames.end()) {
myval = cached_value->second;
continue;
}
const auto cache_value = [&](const auto& input, const auto& value) -> const auto& {
return fieldNames.emplace(input, value).first->second;
};
auto it = manualFixPairs.find(fieldNameInput);
if (it != manualFixPairs.end()) {
myval = it->second;
manualFixPairs.erase(it);
continue;
}
myval = cache_value(fieldNameInput, fieldNameInput);
benchmark::DoNotOptimize(myval);
}
}
}
// Register the function as a benchmark
BENCHMARK(NotConstexpr);