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Merged
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Sep 25, 2025
Merged

Improve existing vector<bool> benchmarks #5732

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8 changes: 8 additions & 0 deletions benchmarks/inc/utility.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -26,3 +26,11 @@ std::vector<Contained, Alloc<Contained>> random_vector(size_t n) {

return res;
}

std::vector<bool> random_bool_vector(const size_t size) {
std::mt19937 gen;
std::bernoulli_distribution dist{0.5};
std::vector<bool> result(size);
std::generate(result.begin(), result.end(), [&] { return dist(gen); });
return result;
}
45 changes: 27 additions & 18 deletions benchmarks/src/vector_bool_copy.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -8,84 +8,93 @@
#include <random>
#include <vector>

using namespace std;
#include "utility.hpp"

vector<bool> createRandomVector(const size_t size) {
static mt19937 gen;
vector<bool> result(size);
generate_n(result.begin(), size, [] { return bernoulli_distribution{0.5}(gen); });
return result;
}
using namespace std;

void copy_block_aligned(benchmark::State& state) {
const auto size = static_cast<size_t>(state.range(0));
const vector<bool> source = createRandomVector(size);
const auto size = static_cast<size_t>(state.range(0));
vector<bool> source = random_bool_vector(size);
vector<bool> dest(size, false);

for (auto _ : state) {
benchmark::DoNotOptimize(source);
copy(source.cbegin(), source.cend(), dest.begin());
benchmark::DoNotOptimize(dest);
}
}

void copy_source_misaligned(benchmark::State& state) {
const auto size = static_cast<size_t>(state.range(0));
const vector<bool> source = createRandomVector(size);
const auto size = static_cast<size_t>(state.range(0));
vector<bool> source = random_bool_vector(size);
vector<bool> dest(size, false);

for (auto _ : state) {
benchmark::DoNotOptimize(source);
copy(source.cbegin() + 1, source.cend(), dest.begin());
benchmark::DoNotOptimize(dest);
}
}

void copy_dest_misaligned(benchmark::State& state) {
const auto size = static_cast<size_t>(state.range(0));
const vector<bool> source = createRandomVector(size);
const auto size = static_cast<size_t>(state.range(0));
vector<bool> source = random_bool_vector(size);
vector<bool> dest(size, false);

for (auto _ : state) {
benchmark::DoNotOptimize(source);
copy(source.cbegin(), source.cend() - 1, dest.begin() + 1);
benchmark::DoNotOptimize(dest);
}
}

// Special benchmark for matching char alignment
void copy_matching_alignment(benchmark::State& state) {
const auto size = static_cast<size_t>(state.range(0));
const vector<bool> source = createRandomVector(size);
const auto size = static_cast<size_t>(state.range(0));
vector<bool> source = random_bool_vector(size);
vector<bool> dest(size, false);

for (auto _ : state) {
benchmark::DoNotOptimize(source);
copy(source.cbegin() + 5, source.cend(), dest.begin() + 5);
benchmark::DoNotOptimize(dest);
}
}

// Special benchmarks for single block corner case
void copy_both_single_blocks(benchmark::State& state) {
const vector<bool> source = createRandomVector(50);
vector<bool> source = random_bool_vector(50);
vector<bool> dest(50, false);

const size_t length = 20;
for (auto _ : state) {
benchmark::DoNotOptimize(source);
copy(source.cbegin() + 5, source.cbegin() + 5 + length, dest.begin() + 5);
benchmark::DoNotOptimize(dest);
}
}

void copy_source_single_block(benchmark::State& state) {
const vector<bool> source = createRandomVector(50);
vector<bool> source = random_bool_vector(50);
vector<bool> dest(50, false);

const size_t length = 20;
for (auto _ : state) {
benchmark::DoNotOptimize(source);
copy(source.cbegin() + 5, source.cbegin() + 5 + length, dest.begin() + 25);
benchmark::DoNotOptimize(dest);
}
}

void copy_dest_single_block(benchmark::State& state) {
const vector<bool> source = createRandomVector(50);
vector<bool> source = random_bool_vector(50);
vector<bool> dest(50, false);

const size_t length = 20;
for (auto _ : state) {
benchmark::DoNotOptimize(source);
copy(source.cbegin() + 25, source.cbegin() + 25 + length, dest.begin() + 5);
benchmark::DoNotOptimize(dest);
}
}

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45 changes: 27 additions & 18 deletions benchmarks/src/vector_bool_copy_n.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -8,84 +8,93 @@
#include <random>
#include <vector>

using namespace std;
#include "utility.hpp"

vector<bool> createRandomVector(const size_t size) {
static mt19937 gen;
vector<bool> result(size);
generate_n(result.begin(), size, [] { return bernoulli_distribution{0.5}(gen); });
return result;
}
using namespace std;

void copy_n_block_aligned(benchmark::State& state) {
const auto size = static_cast<size_t>(state.range(0));
const vector<bool> source = createRandomVector(size);
const auto size = static_cast<size_t>(state.range(0));
vector<bool> source = random_bool_vector(size);
vector<bool> dest(size, false);

for (auto _ : state) {
benchmark::DoNotOptimize(source);
copy_n(source.cbegin(), size, dest.begin());
benchmark::DoNotOptimize(dest);
}
}

void copy_n_source_misaligned(benchmark::State& state) {
const auto size = static_cast<size_t>(state.range(0));
const vector<bool> source = createRandomVector(size);
const auto size = static_cast<size_t>(state.range(0));
vector<bool> source = random_bool_vector(size);
vector<bool> dest(size, false);

for (auto _ : state) {
benchmark::DoNotOptimize(source);
copy_n(source.cbegin() + 1, size - 1, dest.begin());
benchmark::DoNotOptimize(dest);
}
}

void copy_n_dest_misaligned(benchmark::State& state) {
const auto size = static_cast<size_t>(state.range(0));
const vector<bool> source = createRandomVector(size);
const auto size = static_cast<size_t>(state.range(0));
vector<bool> source = random_bool_vector(size);
vector<bool> dest(size, false);

for (auto _ : state) {
benchmark::DoNotOptimize(source);
copy_n(source.cbegin(), size - 1, dest.begin() + 1);
benchmark::DoNotOptimize(dest);
}
}

// Special benchmark for matching char alignment
void copy_n_matching_alignment(benchmark::State& state) {
const auto size = static_cast<size_t>(state.range(0));
const vector<bool> source = createRandomVector(size);
const auto size = static_cast<size_t>(state.range(0));
vector<bool> source = random_bool_vector(size);
vector<bool> dest(size, false);

for (auto _ : state) {
benchmark::DoNotOptimize(source);
copy_n(source.cbegin() + 5, size - 5, dest.begin() + 5);
benchmark::DoNotOptimize(dest);
}
}

// Special benchmarks for single block corner case
void copy_n_both_single_blocks(benchmark::State& state) {
const vector<bool> source = createRandomVector(50);
vector<bool> source = random_bool_vector(50);
vector<bool> dest(50, false);

const size_t length = 20;
for (auto _ : state) {
benchmark::DoNotOptimize(source);
copy_n(source.cbegin() + 5, length, dest.begin() + 5);
benchmark::DoNotOptimize(dest);
}
}

void copy_n_source_single_block(benchmark::State& state) {
const vector<bool> source = createRandomVector(50);
vector<bool> source = random_bool_vector(50);
vector<bool> dest(50, false);

const size_t length = 20;
for (auto _ : state) {
benchmark::DoNotOptimize(source);
copy_n(source.cbegin() + 5, length, dest.begin() + 25);
benchmark::DoNotOptimize(dest);
}
}

void copy_n_dest_single_block(benchmark::State& state) {
const vector<bool> source = createRandomVector(50);
vector<bool> source = random_bool_vector(50);
vector<bool> dest(50, false);

const size_t length = 20;
for (auto _ : state) {
benchmark::DoNotOptimize(source);
copy_n(source.cbegin() + 25, length, dest.begin() + 5);
benchmark::DoNotOptimize(dest);
}
}

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13 changes: 3 additions & 10 deletions benchmarks/src/vector_bool_count.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -8,19 +8,13 @@
#include <random>
#include <vector>

using namespace std;
#include "utility.hpp"

vector<bool> createRandomVector(const size_t size) {
mt19937 gen;
bernoulli_distribution dist{0.5};
vector<bool> result(size);
generate(result.begin(), result.end(), [&] { return dist(gen); });
return result;
}
using namespace std;

void count_aligned(benchmark::State& state) {
const auto size = static_cast<size_t>(state.range(0));
vector<bool> v = createRandomVector(size);
vector<bool> v = random_bool_vector(size);

bool b = false;

Expand All @@ -33,7 +27,6 @@ void count_aligned(benchmark::State& state) {
}
}


BENCHMARK(count_aligned)->RangeMultiplier(64)->Range(64, 64 << 10);

BENCHMARK_MAIN();
45 changes: 27 additions & 18 deletions benchmarks/src/vector_bool_move.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -8,84 +8,93 @@
#include <random>
#include <vector>

using namespace std;
#include "utility.hpp"

vector<bool> createRandomVector(const size_t size) {
static mt19937 gen;
vector<bool> result(size);
generate_n(result.begin(), size, [] { return bernoulli_distribution{0.5}(gen); });
return result;
}
using namespace std;

void move_block_aligned(benchmark::State& state) {
const auto size = static_cast<size_t>(state.range(0));
const vector<bool> source = createRandomVector(size);
const auto size = static_cast<size_t>(state.range(0));
vector<bool> source = random_bool_vector(size);
vector<bool> dest(size, false);

for (auto _ : state) {
benchmark::DoNotOptimize(source);
move(source.cbegin(), source.cend(), dest.begin());
benchmark::DoNotOptimize(dest);
}
}

void move_source_misaligned(benchmark::State& state) {
const auto size = static_cast<size_t>(state.range(0));
const vector<bool> source = createRandomVector(size);
const auto size = static_cast<size_t>(state.range(0));
vector<bool> source = random_bool_vector(size);
vector<bool> dest(size, false);

for (auto _ : state) {
benchmark::DoNotOptimize(source);
move(source.cbegin() + 1, source.cend(), dest.begin());
benchmark::DoNotOptimize(dest);
}
}

void move_dest_misaligned(benchmark::State& state) {
const auto size = static_cast<size_t>(state.range(0));
const vector<bool> source = createRandomVector(size);
const auto size = static_cast<size_t>(state.range(0));
vector<bool> source = random_bool_vector(size);
vector<bool> dest(size, false);

for (auto _ : state) {
benchmark::DoNotOptimize(source);
move(source.cbegin(), source.cend() - 1, dest.begin() + 1);
benchmark::DoNotOptimize(dest);
}
}

// Special benchmark for matching char alignment
void move_matching_alignment(benchmark::State& state) {
const auto size = static_cast<size_t>(state.range(0));
const vector<bool> source = createRandomVector(size);
const auto size = static_cast<size_t>(state.range(0));
vector<bool> source = random_bool_vector(size);
vector<bool> dest(size, false);

for (auto _ : state) {
benchmark::DoNotOptimize(source);
move(source.cbegin() + 5, source.cend(), dest.begin() + 5);
benchmark::DoNotOptimize(dest);
}
}

// Special benchmarks for single block corner case
void move_both_single_blocks(benchmark::State& state) {
const vector<bool> source = createRandomVector(50);
vector<bool> source = random_bool_vector(50);
vector<bool> dest(50, false);

const size_t length = 20;
for (auto _ : state) {
benchmark::DoNotOptimize(source);
move(source.cbegin() + 5, source.cbegin() + 5 + length, dest.begin() + 5);
benchmark::DoNotOptimize(dest);
}
}

void move_source_single_block(benchmark::State& state) {
const vector<bool> source = createRandomVector(50);
vector<bool> source = random_bool_vector(50);
vector<bool> dest(50, false);

const size_t length = 20;
for (auto _ : state) {
benchmark::DoNotOptimize(source);
move(source.cbegin() + 5, source.cbegin() + 5 + length, dest.begin() + 25);
benchmark::DoNotOptimize(dest);
}
}

void move_dest_single_block(benchmark::State& state) {
const vector<bool> source = createRandomVector(50);
vector<bool> source = random_bool_vector(50);
vector<bool> dest(50, false);

const size_t length = 20;
for (auto _ : state) {
benchmark::DoNotOptimize(source);
move(source.cbegin() + 25, source.cbegin() + 25 + length, dest.begin() + 5);
benchmark::DoNotOptimize(dest);
}
}

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