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expolit/benchmarks/benchmark.cc
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benchmark.cc
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/**
* @file benchmark.cc
* @author Lucas Frérot <lucas.frerot@epfl.ch>
* @date Thu Mar 3 2016
*/
#include <expolit/expolit>
#include <benchmark/benchmark.h>
#include <random>
using namespace expolit;
constexpr Polynomial<Real, 1> z({0, 1});
using lin = std::remove_cv_t<decltype(z)>;
static void compact_integral(benchmark::State& state) {
std::random_device rd;
std::mt19937 gen(rd());
std::uniform_real_distribution<> dis(1, 2);
Real q = dis(gen);
std::pair<Real, Real> bounds(-1, 1);
for (auto _ : state) {
auto integrant = exp(q * z) * ((1 + z) * 0.5);
auto value = definite_integral(bounds, integrant);
benchmark::DoNotOptimize(value);
}
}
static void constexpr_integral(benchmark::State& state) {
std::random_device rd;
std::mt19937 gen(rd());
std::uniform_real_distribution<> dis(1, 2);
Real q = dis(gen);
constexpr auto expo = integrate(exp(z));
constexpr auto xexpo = integrate(z * exp(z));
auto factor = 1 / q;
for (auto _ : state) {
std::pair<Real, Real> bounds(-q, q);
auto value = 0.5 * (expo(bounds.second) - expo(bounds.first)) +
0.5 * factor * (xexpo(bounds.second) - xexpo(bounds.first));
benchmark::DoNotOptimize(value);
}
}
using Q = Litteral<struct Q_>;
static void substitution_integral(benchmark::State& state) {
std::random_device rd;
std::mt19937 gen(rd());
std::uniform_real_distribution<> dis(1, 2);
Real q = dis(gen);
constexpr Q qv;
constexpr auto integral = integrate(exp(qv * z) * ((1 + z) * 0.5));
for (auto _ : state) {
auto f = substitute<Q::tag>(Constant<Real>({q}), integral);
auto value = f(1) - f(-1);
benchmark::DoNotOptimize(value);
}
}
BENCHMARK(compact_integral);
BENCHMARK(constexpr_integral);
BENCHMARK(substitution_integral);
BENCHMARK_MAIN();
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