* [committed] libstdc++: Add performance test for atomic_flag [PR 46447]
@ 2020-12-16 13:38 Jonathan Wakely
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From: Jonathan Wakely @ 2020-12-16 13:38 UTC (permalink / raw)
To: libstdc++, gcc-patches
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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.
Tested powerpc64le-linux. Committed to trunk.
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commit 3cee0c6562e5d8df69a9d6ad613a6f3edcfcc797
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Wed Dec 16 11:51:42 2020
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.
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 00000000000..af1a269a0e0
--- /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;
+}
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