blob: 0b3b24f9f12d290769c9ed5445f6b38faf2abde4 [file] [log] [blame]
// 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, 100);
// 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);
} // namespace