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Update 2026-02-07

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Doncho N. Gunchev 2026-02-07 15:41:27 +02:00
parent b6930e02c5
commit 6526f7ae04
6 changed files with 125 additions and 38 deletions
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41
src/transform.cpp
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@ -3,13 +3,16 @@
#include <benchmark/benchmark.h>
#include <string>
#include <sysexits.h>
#include <cstring>
const char* data = "Hello world, to be or not to be a long string, that is the question!";
static void algorithm_lowercase_my(benchmark::State& state) {
std::string name;
name.reserve(strlen(data));
for (auto _ : state) { // Code inside this loop is measured repeatedly
std::string name = data;
name = data;
std::transform(name.cbegin(), name.cend(), name.begin(), [](char c) noexcept {
return (c >= 'a' && c <= 'z') ? c = c - 'a' + 'A' : c;
});
@ -19,8 +22,10 @@ static void algorithm_lowercase_my(benchmark::State& state) {
BENCHMARK(algorithm_lowercase_my); // Register the function as a benchmark
static void loop_lowercase_my(benchmark::State& state) {
std::string name;
name.reserve(strlen(data));
for (auto _ : state) { // Code before the loop is not measured
std::string name = data;
name = data;
for (char& c : name) {
if (c >= 'a' && c <= 'z') {
c = c - 'a' + 'A';
@ -33,8 +38,10 @@ BENCHMARK(loop_lowercase_my); // Register the function as a benchmark
static void algorithm_lowercase_toupper(benchmark::State& state) {
std::string name;
name.reserve(strlen(data));
for (auto _ : state) { // Code inside this loop is measured repeatedly
std::string name = data;
name = data;
std::transform(name.cbegin(), name.cend(), name.begin(), [](char c) noexcept {
return std::toupper(static_cast<unsigned char>(c));
});
@ -44,6 +51,21 @@ static void algorithm_lowercase_toupper(benchmark::State& state) {
BENCHMARK(algorithm_lowercase_toupper); // Register the function as a benchmark
static void loop_lowercase_toupper(benchmark::State& state) {
std::string name;
name.reserve(strlen(data));
for (auto _ : state) { // Code inside this loop is measured repeatedly
name = data;
for (char& c : name) {
if (c >= 'a' && c <= 'z') {
c = static_cast<char>(std::toupper(c));
}
}
benchmark::DoNotOptimize(name); // Make sure the variable is not optimized away by compiler
}
}
BENCHMARK(loop_lowercase_toupper); // Register the function as a benchmark
int main(int argc, char** argv) {
benchmark::Initialize(&argc, argv);
if (benchmark::ReportUnrecognizedArguments(argc, argv)) {
@ -53,16 +75,3 @@ int main(int argc, char** argv) {
benchmark::RunSpecifiedBenchmarks();
return EX_OK;
}
static void loop_lowercase_toupper(benchmark::State& state) {
for (auto _ : state) { // Code inside this loop is measured repeatedly
std::string name = data;
for (char& c : name) {
if (c >= 'a' && c <= 'z') {
c = static_cast<char>(std::toupper(c));
}
}
benchmark::DoNotOptimize(name); // Make sure the variable is not optimized away by compiler
}
}
BENCHMARK(loop_lowercase_toupper); // Register the function as a benchmark