[libcxx] r277373 - Adding smart_ptr benchmark

[Ben Craig via cfe-commits]

Author: bcraig
Date: Mon Aug  1 14:56:39 2016
New Revision: 277373

URL: http://llvm.org/viewvc/llvm-project?rev=277373&view=rev
Log:
Adding smart_ptr benchmark

Initial draft here:
https://reviews.llvm.org/D22470
... though this is Eric Fiselier's rewrite to fit in with Google
Benchmark.

Added:
    libcxx/trunk/benchmarks/util_smartptr.bench.cpp

Added: libcxx/trunk/benchmarks/util_smartptr.bench.cpp
URL: http://llvm.org/viewvc/llvm-project/libcxx/trunk/benchmarks/util_smartptr.bench.cpp?rev=277373&view=auto
==============================================================================
--- libcxx/trunk/benchmarks/util_smartptr.bench.cpp (added)
+++ libcxx/trunk/benchmarks/util_smartptr.bench.cpp Mon Aug  1 14:56:39 2016
@@ -0,0 +1,42 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include <memory>
+
+#include "benchmark/benchmark_api.h"
+
+static void BM_SharedPtrCreateDestroy(benchmark::State& st) {
+  while (st.KeepRunning()) {
+    auto sp = std::make_shared<int>(42);
+    benchmark::DoNotOptimize(sp.get());
+  }
+}
+BENCHMARK(BM_SharedPtrCreateDestroy);
+
+static void BM_SharedPtrIncDecRef(benchmark::State& st) {
+  auto sp = std::make_shared<int>(42);
+  benchmark::DoNotOptimize(sp.get());
+  while (st.KeepRunning()) {
+    std::shared_ptr<int> sp2(sp);
+    benchmark::ClobberMemory();
+  }
+}
+BENCHMARK(BM_SharedPtrIncDecRef);
+
+static void BM_WeakPtrIncDecRef(benchmark::State& st) {
+  auto sp = std::make_shared<int>(42);
+  benchmark::DoNotOptimize(sp.get());
+  while (st.KeepRunning()) {
+    std::weak_ptr<int> wp(sp);
+    benchmark::ClobberMemory();
+  }
+}
+BENCHMARK(BM_WeakPtrIncDecRef);
+
+BENCHMARK_MAIN()