qt5base-lts/tests/auto/selftests/benchlibcallgrind/tst_benchlibcallgrind.cpp

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

/* This test must be explicitly enabled since there are no compile tests for valgrind.h */
#ifdef QT_BUG236484
#include <valgrind/valgrind.h>
#endif

class tst_BenchlibCallgrind: public QObject
{
    Q_OBJECT

private slots:
#ifdef QT_BUG236484
    void failInChildProcess();
#endif

    void twoHundredMillionInstructions();
};

#ifdef QT_BUG236484
void tst_BenchlibCallgrind::failInChildProcess()
{
    static double f = 1.0;
    QBENCHMARK {
        for (int i = 0; i < 1000000; ++i) {
            f *= 1.1;
            if (RUNNING_ON_VALGRIND) QFAIL("Running under valgrind!");
        }
    }
}
#endif

void tst_BenchlibCallgrind::twoHundredMillionInstructions()
{
#if !defined(__GNUC__) || !defined(__i386)
    QSKIP("This test is only defined for gcc and x86.", SkipAll);
#else
    QBENCHMARK {
        __asm__ __volatile__(
            "mov $100000000,%%eax   \n"
            "LOOPTOP:               \n"
            "dec %%eax              \n"
            "jnz LOOPTOP            \n"
            : /* no output */
            : /* no input */
            : /* clobber */ "eax"
        );
    }
#endif
}

QTEST_MAIN(tst_BenchlibCallgrind)

#include "tst_benchlibcallgrind.moc"