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 "bench/bench.h"
 
#include "compat.h"
#include "prevector.h"
#include "serialize.h"
#include "streams.h"
 
#include <type_traits>
 
// GCC 4.8 is missing some C++11 type_traits,
// https://www.gnu.org/software/gcc/gcc-5/changes.html
#if defined(__GNUC__) && !defined(__clang__) && __GNUC__ < 5
#define IS_TRIVIALLY_CONSTRUCTIBLE std::has_trivial_default_constructor
#else
#define IS_TRIVIALLY_CONSTRUCTIBLE std::is_trivially_default_constructible
#endif
 
struct nontrivial_t {
    int x;
    nontrivial_t() :x(-1) {}
    SERIALIZE_METHODS(nontrivial_t, obj) { READWRITE(obj.x); }
};
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)