diff options
Diffstat (limited to 'tests/benchmarks/corelib/tools/qhash/outofline.cpp')
-rw-r--r-- | tests/benchmarks/corelib/tools/qhash/outofline.cpp | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/tests/benchmarks/corelib/tools/qhash/outofline.cpp b/tests/benchmarks/corelib/tools/qhash/outofline.cpp new file mode 100644 index 0000000000..0a60da29a3 --- /dev/null +++ b/tests/benchmarks/corelib/tools/qhash/outofline.cpp @@ -0,0 +1,90 @@ +/**************************************************************************** +** +** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the QtTest module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the Technology Preview License Agreement accompanying +** this package. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain additional +** rights. These rights are described in the Nokia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** If you have questions regarding the use of this file, please contact +** Nokia at qt-info@nokia.com. +** +** +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qhash_string.h" + +static void doHash(const unsigned short *p, uint &h) +{ +#if 1 + // Copied from static uint hash(const QChar *p, int n). + // Possibly not the cheapest way. + h = (h << 4) + (*p++); + h ^= (h & 0xf0000000) >> 23; + h &= 0x0fffffff; + + h = (h << 4) + (*p++); + h ^= (h & 0xf0000000) >> 23; + h &= 0x0fffffff; + + h = (h << 4) + (*p++); + h ^= (h & 0xf0000000) >> 23; + h &= 0x0fffffff; + + h = (h << 4) + (*p++); + h ^= (h & 0xf0000000) >> 23; + h &= 0x0fffffff; +#else + // Faster, but probably less spread. + h ^= *(unsigned int *)p; +#endif +} + +QT_BEGIN_NAMESPACE + +uint qHash(const String &str) +{ + const unsigned short *p = (unsigned short *)str.constData(); + const int s = str.size(); + switch (s) { + case 0: return 0; + case 1: return *p; + case 2: return *(unsigned int *)p; + case 3: return (*(unsigned int *)p) ^ *(p + 2); + //case 3: return (*p << 11) + (*(p + 1) << 22) + *(p + 2); + } + uint h = 0; + doHash(p, h); + doHash(p + s / 2 - 2, h); + doHash(p + s - 4, h); + return h; +} + +QT_END_NAMESPACE |