AuroraMiddleware/qt5base-lts
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Optimize some atomic counters

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Define the static QAtomic at file scope to avoid GCC's pessimisation with
function-static QAtomic (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79561),
and make sure the initial value is 0, so it ends up in BSS, not TEXT.

In QRhi..., don't create a static instance of the wrapper class, use a file-
static atomic, too. This turns the class into a glorified namespace.

Change-Id: I707f628e2b434330028077223071716d5704ba32
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
This commit is contained in:
Marc Mutz 2019-06-25 22:21:44 +02:00
parent 6fa34930c2
commit 8da3eea4fb
5 changed files with 11 additions and 12 deletions
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5
src/gui/rhi/qrhi.cpp
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@ -5192,10 +5192,11 @@ int QRhi::ubufAlignment() const
return d->ubufAlignment();
}
static QBasicAtomicInteger<QRhiGlobalObjectIdGenerator::Type> counter = Q_BASIC_ATOMIC_INITIALIZER(0);
QRhiGlobalObjectIdGenerator::Type QRhiGlobalObjectIdGenerator::newId()
{
static QRhiGlobalObjectIdGenerator inst;
return ++inst.counter;
return counter.fetchAndAddRelaxed(1) + 1;
}
bool QRhiPassResourceTracker::isEmpty() const

4
src/gui/rhi/qrhi_p_p.h
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@ -52,7 +52,6 @@
#include "qrhiprofiler_p_p.h"
#include <QBitArray>
#include <QAtomicInt>
#include <QAtomicInteger>
QT_BEGIN_NAMESPACE
@ -484,9 +483,6 @@ public:
using Type = quint32;
#endif
static Type newId();
private:
QAtomicInteger<Type> counter;
};
class QRhiPassResourceTracker

4
src/gui/text/qfont.cpp
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@ -2799,12 +2799,12 @@ void QFontCache::cleanup()
cache->setLocalData(0);
}
QBasicAtomicInt font_cache_id = Q_BASIC_ATOMIC_INITIALIZER(1);
static QBasicAtomicInt font_cache_id = Q_BASIC_ATOMIC_INITIALIZER(0);
QFontCache::QFontCache()
: QObject(), total_cost(0), max_cost(min_cost),
current_timestamp(0), fast(false), timer_id(-1),
m_id(font_cache_id.fetchAndAddRelaxed(1))
m_id(font_cache_id.fetchAndAddRelaxed(1) + 1)
{
}

5
src/platformsupport/fbconvenience/qfbwindow.cpp
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@ -45,11 +45,12 @@
QT_BEGIN_NAMESPACE
static QBasicAtomicInt winIdGenerator = Q_BASIC_ATOMIC_INITIALIZER(0);
QFbWindow::QFbWindow(QWindow *window)
: QPlatformWindow(window), mBackingStore(0), mWindowState(Qt::WindowNoState)
{
static QAtomicInt winIdGenerator(1);
mWindowId = winIdGenerator.fetchAndAddRelaxed(1);
mWindowId = winIdGenerator.fetchAndAddRelaxed(1) + 1;
}
QFbWindow::~QFbWindow()

5
src/plugins/platforms/android/qandroidplatformwindow.cpp
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@ -49,13 +49,14 @@
QT_BEGIN_NAMESPACE
static QBasicAtomicInt winIdGenerator = Q_BASIC_ATOMIC_INITIALIZER(0);
QAndroidPlatformWindow::QAndroidPlatformWindow(QWindow *window)
: QPlatformWindow(window)
{
m_windowFlags = Qt::Widget;
m_windowState = Qt::WindowNoState;
static QAtomicInt winIdGenerator(1);
m_windowId = winIdGenerator.fetchAndAddRelaxed(1);
m_windowId = winIdGenerator.fetchAndAddRelaxed(1) + 1;
setWindowState(window->windowStates());
}