qt-everywhere-src-5.15.1/qt3d/tests/benchmarks/core/qcircularbuffer/tst_bench_qcircularbuffer.cpp

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** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
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#include <QObject>
#include <QtTest/QtTest>

#include <Qt3DCore/private/qcircularbuffer_p.h>

using namespace Qt3DCore;

class tst_QCircularBuffer : public QObject
{
    Q_OBJECT
private Q_SLOTS:
    void benchmarkAppend();
    void benchmarkAt();
};

void tst_QCircularBuffer::benchmarkAppend()
{
    QCircularBuffer<float> c;
    c.setCapacity(100000);
    volatile int confuseTheOptimizer = 90000;
    QBENCHMARK {
        const int count = confuseTheOptimizer;
        for (int i = 0; i < count; i++) {
            c.append(float(i));
        }
    }
    const int count = confuseTheOptimizer;
    volatile float f;
    for (int i = 0; i < count; i++) {
        f = c.at(i);
    }
    Q_UNUSED(f);
}

void tst_QCircularBuffer::benchmarkAt()
{
    QCircularBuffer<float> c;
    c.setCapacity(20000);
    volatile int confuseTheOptimizer = 90000;
    const int count = confuseTheOptimizer;
    for (int i = 0; i < count; i++) {
        c.append(float(i));
    }
    QCOMPARE(c.isLinearised(), false);
    QBENCHMARK {
        const int count = c.size();
        volatile float f;
        for (int i = 0; i < count; i++) {
            f = c.at(i);
        }
        Q_UNUSED(f);
    }
}

QTEST_APPLESS_MAIN(tst_QCircularBuffer)
#include "tst_bench_qcircularbuffer.moc"