qt5base-lts/tests/auto/selftests/benchlibtickcounter/tst_benchlibtickcounter.cpp

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#include <QtCore>
#include <QtTest/QtTest>

#include <private/cycle_p.h>

class tst_BenchlibTickCounter: public QObject
{
    Q_OBJECT

private slots:
    void threeBillionTicks();
};

void tst_BenchlibTickCounter::threeBillionTicks()
{
#ifndef HAVE_TICK_COUNTER
    QSKIP("Tick counter not available on this platform", SkipAll);
#else
    QBENCHMARK {
        CycleCounterTicks start = getticks();
        double el = 0.;
        double max = el;
        while (el < 3000000000.) {
            /* Verify that elapsed time never decreases */
            QVERIFY2(el >= max, qPrintable(
                QString("Tick counter is not monotonic\nElapsed moved from %1 to %2")
                    .arg(max).arg(el)
            ));
            max = el;
            el = elapsed(getticks(), start);
        }
    }
#endif
}

QTEST_MAIN(tst_BenchlibTickCounter)

#include "tst_benchlibtickcounter.moc"