prevector.cpp

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// Copyright (c) 2015-2017 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include <compat.h>
#include <prevector.h>

#include <bench/bench.h>

struct nontrivial_t {
    int x;
    nontrivial_t() :x(-1) {}
};
static_assert(!IS_TRIVIALLY_CONSTRUCTIBLE<nontrivial_t>::value,
              "expected nontrivial_t to not be trivially constructible");

typedef unsigned char trivial_t;
static_assert(IS_TRIVIALLY_CONSTRUCTIBLE<trivial_t>::value,
              "expected trivial_t to be trivially constructible");

template <typename T>
static void PrevectorDestructor(benchmark::State& state)
{
    while (state.KeepRunning()) {
        for (auto x = 0; x < 1000; ++x) {
            prevector<28, T> t0;
            prevector<28, T> t1;
            t0.resize(28);
            t1.resize(29);
        }
    }
}

template <typename T>
static void PrevectorClear(benchmark::State& state)
{

    while (state.KeepRunning()) {
        for (auto x = 0; x < 1000; ++x) {
            prevector<28, T> t0;
            prevector<28, T> t1;
            t0.resize(28);
            t0.clear();
            t1.resize(29);
            t0.clear();
        }
    }
}

template <typename T>
void PrevectorResize(benchmark::State& state)
{
    while (state.KeepRunning()) {
        prevector<28, T> t0;
        prevector<28, T> t1;
        for (auto x = 0; x < 1000; ++x) {
            t0.resize(28);
            t0.resize(0);
            t1.resize(29);
            t1.resize(0);
        }
    }
}

#define PREVECTOR_TEST(name, nontrivops, trivops)                       \
    static void Prevector ## name ## Nontrivial(benchmark::State& state) { \
        PrevectorResize<nontrivial_t>(state);                           \
    }                                                                   \
    BENCHMARK(Prevector ## name ## Nontrivial/*, nontrivops*/);             \
    static void Prevector ## name ## Trivial(benchmark::State& state) { \
        PrevectorResize<trivial_t>(state);                              \
    }                                                                   \
    BENCHMARK(Prevector ## name ## Trivial/*, trivops*/);

PREVECTOR_TEST(Clear, 28300, 88600)
PREVECTOR_TEST(Destructor, 28800, 88900)
PREVECTOR_TEST(Resize, 28900, 90300)

#include <vector>

typedef prevector<28, unsigned char> prevec;

static void PrevectorAssign(benchmark::State& state)
{
    prevec t;
    t.resize(28);
    std::vector<unsigned char> v;
    while (state.KeepRunning()) {
        for (int i = 0; i < 1000; ++i) {
            prevec::const_iterator b = t.begin() + 5;
            prevec::const_iterator e = b + 20;
            v.assign(b, e);
        }
    }
}

static void PrevectorAssignTo(benchmark::State& state)
{
    prevec t;
    t.resize(28);
    std::vector<unsigned char> v;
    while (state.KeepRunning()) {
        for (int i = 0; i < 1000; ++i) {
            prevec::const_iterator b = t.begin() + 5;
            prevec::const_iterator e = b + 20;
            t.assign_to(b, e, v);
        }
    }
}

BENCHMARK(PrevectorAssign)
BENCHMARK(PrevectorAssignTo)