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Suppress a broken benchmark comparing QVector to std::vector

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The test constructs an ersatz object with which to overwrite a
QVector's internals, but based it on Qt 5's memory layout. Since Qt 6
completely rearranged that memory layout, the test now crashes (or, in
a debug build, trips over an out-of-bounds assertion).

So suppress the test until those who perpetrated it and/or the
reworking of QVector's internals can work out how to fix it.
That way, QA can at least run the benchmark without crashing.

Task-number: QTBUG-95061
Pick-to: 6.2
Change-Id: I0e8c8d58f2002497f6e29d0ad25f840e207704a4
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
This commit is contained in:
Edward Welbourne 2021-07-08 15:39:41 +02:00
parent 1969a25cee
commit 406bb11a4e
2 changed files with 15 additions and 6 deletions
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20
tests/benchmarks/corelib/tools/qvector/main.cpp
View File

@ -1,6 +1,6 @@
/**************************************************************************** /****************************************************************************
** **
** Copyright (C) 2016 The Qt Company Ltd. ** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/ ** Contact: https://www.qt.io/licensing/
** **
** This file is part of the test suite of the Qt Toolkit. ** This file is part of the test suite of the Qt Toolkit.
@ -175,6 +175,16 @@ sys 0m0.008s
#define TEST_RETURN 1 #define TEST_RETURN 1
#if TEST_RETURN
/* QRawVector::mutateToVector() hacks a semblance of a Qt 5 QVector.
However, Qt 6's QVector is Qt 6's QList and completely different in internal
layout. The QTypedArrayData inside it is also completely rearranged. Until
QRawVector can be rewritten to do whatever it's supposed to do in a
Qt6-compatible way, this test is suppressed, see QTBUG-95061.
*/
#define TEST_RAW 0
#endif
// For some reason, both 'plain' and '-callgrind' create strange results // For some reason, both 'plain' and '-callgrind' create strange results
// (like varying instruction count for the same assembly code) // (like varying instruction count for the same assembly code)
@ -218,9 +228,9 @@ private slots:
void qrawvector_separator() { qWarning() << "QRawVector results: "; } void qrawvector_separator() { qWarning() << "QRawVector results: "; }
void qrawvector_const_read_access(); void qrawvector_const_read_access();
void qrawvector_mutable_read_access(); void qrawvector_mutable_read_access();
#ifdef TEST_RETURN #if TEST_RAW
void qrawvector_fill_and_return(); void qrawvector_fill_and_return();
#endif #endif
}; };
const int N = 1000000; const int N = 1000000;
@ -321,9 +331,7 @@ void tst_QVector::qvector_pop_back()
} }
} }
#if TEST_RAW
#ifdef TEST_RETURN
extern QVector<double> qrawvector_fill_and_return_helper(); extern QVector<double> qrawvector_fill_and_return_helper();
void tst_QVector::qrawvector_fill_and_return() void tst_QVector::qrawvector_fill_and_return()

1
tests/benchmarks/corelib/tools/qvector/qrawvector.h
View File

@ -217,6 +217,7 @@ private:
public: public:
QVector<T> mutateToVector() QVector<T> mutateToVector()
{ {
Q_ASSERT(!"Fix QTBUG-95061 before calling this; it is broken beyond repair");
Data *d = toBase(m_begin); Data *d = toBase(m_begin);
d->ref.initializeOwned(); d->ref.initializeOwned();
d->alloc = m_alloc; d->alloc = m_alloc;