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author | Jonathan Wakely <jwakely@redhat.com> | 2020-12-16 11:51:42 +0000 |
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committer | Jonathan Wakely <jwakely@redhat.com> | 2020-12-16 13:36:02 +0000 |
commit | 3cee0c6562e5d8df69a9d6ad613a6f3edcfcc797 (patch) | |
tree | 91740d88b6e8b3c550c856b930c229439aa51dbf /libstdc++-v3 | |
parent | a2c2eec183acf25c9b214fa0827718e4d2fdfc93 (diff) | |
download | gcc-3cee0c6562e5d8df69a9d6ad613a6f3edcfcc797.zip gcc-3cee0c6562e5d8df69a9d6ad613a6f3edcfcc797.tar.gz gcc-3cee0c6562e5d8df69a9d6ad613a6f3edcfcc797.tar.bz2 |
libstdc++: Add performance test for atomic_flag [PR 46447]
This adds a test to compare the performance of std::atomic_flag with
similar operations on std::atomic_uchar and std::atomic_int.
libstdc++-v3/ChangeLog:
PR libstdc++/46447
* testsuite/performance/29_atomics/atomic_flag.cc: New test.
Diffstat (limited to 'libstdc++-v3')
-rw-r--r-- | libstdc++-v3/testsuite/performance/29_atomics/atomic_flag.cc | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/libstdc++-v3/testsuite/performance/29_atomics/atomic_flag.cc b/libstdc++-v3/testsuite/performance/29_atomics/atomic_flag.cc new file mode 100644 index 0000000..af1a269 --- /dev/null +++ b/libstdc++-v3/testsuite/performance/29_atomics/atomic_flag.cc @@ -0,0 +1,71 @@ +// Copyright (C) 2009-2020 Free Software Foundation, Inc. +// +// This file is part of the GNU ISO C++ Library. This library is free +// software; you can redistribute it and/or modify it under the +// terms of the GNU General Public License as published by the +// Free Software Foundation; either version 3, or (at your option) +// any later version. + +// This library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. + +// You should have received a copy of the GNU General Public License along +// with this library; see the file COPYING3. If not see +// <http://www.gnu.org/licenses/>. + + +#include <atomic> +#include <testsuite_performance.h> + +volatile std::atomic_flag af; +volatile std::atomic_uchar ac; +volatile std::atomic_int ai; + +int main() +{ + using namespace __gnu_test; + time_counter time; + resource_counter resource; + + const int n = 100000000; + + start_counters(time, resource); + for (int i = 0; i < n; ++i) + af.test_and_set(); + stop_counters(time, resource); + report_performance(__FILE__, "atomic_flag::test_and_set()", time, resource); + + start_counters(time, resource); + for (int i = 0; i < n; ++i) + af.clear(); + stop_counters(time, resource); + report_performance(__FILE__, "atomic_flag::clear()", time, resource); + + start_counters(time, resource); + for (int i = 0; i < n; ++i) + ac |= 1; + stop_counters(time, resource); + report_performance(__FILE__, "atomic_uchar::operator|=(1)", time, resource); + + start_counters(time, resource); + for (int i = 0; i < n; ++i) + ac = 0; + stop_counters(time, resource); + report_performance(__FILE__, "atomic_flag::operator=(0)", time, resource); + + start_counters(time, resource); + for (int i = 0; i < n; ++i) + ai |= 1; + stop_counters(time, resource); + report_performance(__FILE__, "atomic_int::operator|=(1)", time, resource); + + start_counters(time, resource); + for (int i = 0; i < n; ++i) + ai = 0; + stop_counters(time, resource); + report_performance(__FILE__, "atomic_int::operator=(0)", time, resource); + + return 0; +} |