benchmarks/util_smartptr.bench.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is dual licensed under the MIT and the University of Illinois Open
   6 // Source Licenses. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #include <memory>
  11
  12 #include "benchmark/benchmark.h"
  13
  14 static void BM_SharedPtrCreateDestroy(benchmark::State& st) {
  15   while (st.KeepRunning()) {
  16     auto sp = std::make_shared<int>(42);
  17     benchmark::DoNotOptimize(sp.get());
  18   }
  19 }
  20 BENCHMARK(BM_SharedPtrCreateDestroy);
  21
  22 static void BM_SharedPtrIncDecRef(benchmark::State& st) {
  23   auto sp = std::make_shared<int>(42);
  24   benchmark::DoNotOptimize(sp.get());
  25   while (st.KeepRunning()) {
  26     std::shared_ptr<int> sp2(sp);
  27     benchmark::ClobberMemory();
  28   }
  29 }
  30 BENCHMARK(BM_SharedPtrIncDecRef);
  31
  32 static void BM_WeakPtrIncDecRef(benchmark::State& st) {
  33   auto sp = std::make_shared<int>(42);
  34   benchmark::DoNotOptimize(sp.get());
  35   while (st.KeepRunning()) {
  36     std::weak_ptr<int> wp(sp);
  37     benchmark::ClobberMemory();
  38   }
  39 }
  40 BENCHMARK(BM_WeakPtrIncDecRef);
  41
  42 BENCHMARK_MAIN();