| // Copyright 2020 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include <perftest/perftest.h> |
| |
| namespace { |
| |
| // Execute an empty loop for the given number of iterations. |
| bool NoOpLoop(perftest::RepeatState* state, int iteration_count) { |
| while (state->KeepRunning()) { |
| for (int i = 0; i < iteration_count; ++i) { |
| // No-op that the compiler should not optimize away. |
| __asm__ volatile(""); |
| } |
| } |
| return true; |
| } |
| |
| void RegisterTests() { |
| // This is intended as a simple way to test whether regression detection |
| // is working: We can land a change that increases the iteration count |
| // here and then manually check whether a regression gets reported, or |
| // check whether the increase appears on the performance dashboard's |
| // graph. |
| perftest::RegisterTest("ExampleNoOpLoop", NoOpLoop, 1000); |
| |
| // Run these so we have reference values to compare against. |
| perftest::RegisterTest("NoOpLoop/100", NoOpLoop, 100); |
| perftest::RegisterTest("NoOpLoop/1000", NoOpLoop, 1000); |
| perftest::RegisterTest("NoOpLoop/10000", NoOpLoop, 10000); |
| } |
| PERFTEST_CTOR(RegisterTests) |
| |
| } // namespace |
