libcxx/benchmarks/util_smartptr.bench.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include <memory>
  10
  11 #include "benchmark/benchmark.h"
  12
  13 static void BM_SharedPtrCreateDestroy(benchmark::State& st) {
  14   while (st.KeepRunning()) {
  15     auto sp = std::make_shared<int>(42);
  16     benchmark::DoNotOptimize(sp.get());
  17   }
  18 }
  19 BENCHMARK(BM_SharedPtrCreateDestroy);
  20
  21 static void BM_SharedPtrIncDecRef(benchmark::State& st) {
  22   auto sp = std::make_shared<int>(42);
  23   benchmark::DoNotOptimize(sp.get());
  24   while (st.KeepRunning()) {
  25     std::shared_ptr<int> sp2(sp);
  26     benchmark::ClobberMemory();
  27   }
  28 }
  29 BENCHMARK(BM_SharedPtrIncDecRef);
  30
  31 static void BM_WeakPtrIncDecRef(benchmark::State& st) {
  32   auto sp = std::make_shared<int>(42);
  33   benchmark::DoNotOptimize(sp.get());
  34   while (st.KeepRunning()) {
  35     std::weak_ptr<int> wp(sp);
  36     benchmark::ClobberMemory();
  37   }
  38 }
  39 BENCHMARK(BM_WeakPtrIncDecRef);
  40
  41 BENCHMARK_MAIN();