NEON configure detection and initial blend function implementations.

Adds new NEON configure test and -no-neon configure option. NEON
implementations can also be turned off by setting the QT_NO_NEON
environment variable.

Performance improvements (in frames per second):
- Blending ARGB32 on RGB32/ARGB32, mostly opaque: 71 %
- Blending ARGB32 on RGB32/ARGB32, no opaque pixels: 108 %
- Blending ARGB32 on RGB32/ARGB32, with 0.5 opacity: 158 %
- Blending RGB32 on RGB32/ARGB32, with 0.5 opacity: 189 %

Task-number: QTBUG-6684
Reviewed-by: Gunnar Sletta
Reviewed-by: Paul Olav Tvete

2 files changed, 53 insertions, 0 deletions

diff --git a/config.tests/unix/neon/neon.cpp b/config.tests/unix/neon/neon.cpp
new file mode 100644
index 0000000..c31a9fd
--- /dev/null
+++ b/config.tests/unix/neon/neon.cpp
@@ -0,0 +1,51 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the config.tests 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 <arm_neon.h>
+
+int main(int, char**)
+{
+    int32x4_t null = vdupq_n_s32(0x0);
+
+    int result;
+    vst1q_lane_s32(&result, null, 0);
+    return result;
+}
diff --git a/config.tests/unix/neon/neon.pro b/config.tests/unix/neon/neon.pro
new file mode 100644
index 0000000..de20c4e
--- /dev/null
+++ b/config.tests/unix/neon/neon.pro
@@ -0,0 +1,2 @@
+SOURCES = neon.cpp
+CONFIG -= x11 qt