Move the SIMD detection from QtGui to QtCore

The SIMD instructions are useful outside painting code,
the common functions are moved to QtCore

Reviewed-by: Samuel Rødal

3 files changed, 351 insertions, 0 deletions

diff --git a/src/corelib/tools/qsimd.cpp b/src/corelib/tools/qsimd.cpp
new file mode 100644
index 0000000..331a699
--- /dev/null
+++ b/src/corelib/tools/qsimd.cpp
@@ -0,0 +1,227 @@
+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtCore 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 "qsimd_p.h"
+#include <QByteArray>
+
+QT_BEGIN_NAMESPACE
+
+uint qDetectCPUFeatures()
+{
+#if defined (Q_OS_WINCE)
+#if defined (ARM)
+    if (IsProcessorFeaturePresent(PF_ARM_INTEL_WMMX))
+        return IWMMXT;
+#elif defined(_X86_)
+    uint features = 0;
+#if defined QT_HAVE_MMX
+    if (IsProcessorFeaturePresent(PF_MMX_INSTRUCTIONS_AVAILABLE))
+        features |= MMX;
+#endif
+#if defined QT_HAVE_3DNOW
+    if (IsProcessorFeaturePresent(PF_3DNOW_INSTRUCTIONS_AVAILABLE))
+        features |= MMX3DNOW;
+#endif
+    return features;
+#endif
+    return 0;
+#elif defined(QT_HAVE_IWMMXT)
+    // runtime detection only available when running as a previlegied process
+    static const bool doIWMMXT = !qgetenv("QT_NO_IWMMXT").toInt();
+    return doIWMMXT ? IWMMXT : 0;
+#elif defined(QT_HAVE_NEON)
+    static const bool doNEON = !qgetenv("QT_NO_NEON").toInt();
+    return doNEON ? NEON : 0;
+#else
+    uint features = 0;
+#if defined(__x86_64__) || defined(Q_OS_WIN64)
+    features = MMX|SSE|SSE2|CMOV;
+#elif defined(__ia64__)
+    features = MMX|SSE|SSE2;
+#elif defined(__i386__) || defined(_M_IX86)
+    unsigned int extended_result = 0;
+    uint result = 0;
+    /* see p. 118 of amd64 instruction set manual Vol3 */
+#if defined(Q_CC_GNU)
+    asm ("push %%ebx\n"
+         "pushf\n"
+         "pop %%eax\n"
+         "mov %%eax, %%ebx\n"
+         "xor $0x00200000, %%eax\n"
+         "push %%eax\n"
+         "popf\n"
+         "pushf\n"
+         "pop %%eax\n"
+         "xor %%edx, %%edx\n"
+         "xor %%ebx, %%eax\n"
+         "jz 1f\n"
+
+         "mov $0x00000001, %%eax\n"
+         "cpuid\n"
+         "1:\n"
+         "pop %%ebx\n"
+         "mov %%edx, %0\n"
+        : "=r" (result)
+        :
+        : "%eax", "%ecx", "%edx"
+        );
+
+    asm ("push %%ebx\n"
+         "pushf\n"
+         "pop %%eax\n"
+         "mov %%eax, %%ebx\n"
+         "xor $0x00200000, %%eax\n"
+         "push %%eax\n"
+         "popf\n"
+         "pushf\n"
+         "pop %%eax\n"
+         "xor %%edx, %%edx\n"
+         "xor %%ebx, %%eax\n"
+         "jz 2f\n"
+
+         "mov $0x80000000, %%eax\n"
+         "cpuid\n"
+         "cmp $0x80000000, %%eax\n"
+         "jbe 2f\n"
+         "mov $0x80000001, %%eax\n"
+         "cpuid\n"
+         "2:\n"
+         "pop %%ebx\n"
+         "mov %%edx, %0\n"
+        : "=r" (extended_result)
+        :
+        : "%eax", "%ecx", "%edx"
+        );
+#elif defined (Q_OS_WIN)
+    _asm {
+        push eax
+        push ebx
+        push ecx
+        push edx
+        pushfd
+        pop eax
+        mov ebx, eax
+        xor eax, 00200000h
+        push eax
+        popfd
+        pushfd
+        pop eax
+        mov edx, 0
+        xor eax, ebx
+        jz skip
+
+        mov eax, 1
+        cpuid
+        mov result, edx
+    skip:
+        pop edx
+        pop ecx
+        pop ebx
+        pop eax
+    }
+
+    _asm {
+        push eax
+        push ebx
+        push ecx
+        push edx
+        pushfd
+        pop eax
+        mov ebx, eax
+        xor eax, 00200000h
+        push eax
+        popfd
+        pushfd
+        pop eax
+        mov edx, 0
+        xor eax, ebx
+        jz skip2
+
+        mov eax, 80000000h
+        cpuid
+        cmp eax, 80000000h
+        jbe skip2
+        mov eax, 80000001h
+        cpuid
+        mov extended_result, edx
+    skip2:
+        pop edx
+        pop ecx
+        pop ebx
+        pop eax
+    }
+#endif
+
+    // result now contains the standard feature bits
+    if (result & (1u << 15))
+        features |= CMOV;
+    if (result & (1u << 23))
+        features |= MMX;
+    if (extended_result & (1u << 22))
+        features |= MMXEXT;
+    if (extended_result & (1u << 31))
+        features |= MMX3DNOW;
+    if (extended_result & (1u << 30))
+        features |= MMX3DNOWEXT;
+    if (result & (1u << 25))
+        features |= SSE;
+    if (result & (1u << 26))
+        features |= SSE2;
+#endif // i386
+
+    if (qgetenv("QT_NO_MMX").toInt())
+        features ^= MMX;
+    if (qgetenv("QT_NO_MMXEXT").toInt())
+        features ^= MMXEXT;
+    if (qgetenv("QT_NO_3DNOW").toInt())
+        features ^= MMX3DNOW;
+    if (qgetenv("QT_NO_3DNOWEXT").toInt())
+        features ^= MMX3DNOWEXT;
+    if (qgetenv("QT_NO_SSE").toInt())
+        features ^= SSE;
+    if (qgetenv("QT_NO_SSE2").toInt())
+        features ^= SSE2;
+
+    return features;
+#endif
+}
+
+QT_END_NAMESPACE
diff --git a/src/corelib/tools/qsimd_p.h b/src/corelib/tools/qsimd_p.h
new file mode 100644
index 0000000..d535762
--- /dev/null
+++ b/src/corelib/tools/qsimd_p.h
@@ -0,0 +1,122 @@
+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtCore 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.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QSIMD_P_H
+#define QSIMD_P_H
+
+#include <qglobal.h>
+
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Core)
+
+#if defined(QT_NO_MAC_XARCH) || (defined(Q_OS_DARWIN) && (defined(__ppc__) || defined(__ppc64__)))
+// Disable MMX and SSE on Mac/PPC builds, or if the compiler
+// does not support -Xarch argument passing
+#undef QT_HAVE_SSE2
+#undef QT_HAVE_SSE
+#undef QT_HAVE_3DNOW
+#undef QT_HAVE_MMX
+#endif
+
+// SSE intrinsics
+#if defined(QT_HAVE_SSE2) || defined(QT_HAVE_SSE) || defined(QT_HAVE_MMX)
+#if defined(QT_LINUXBASE)
+/// this is an evil hack - the posix_memalign declaration in LSB
+/// is wrong - see http://bugs.linuxbase.org/show_bug.cgi?id=2431
+#  define posix_memalign _lsb_hack_posix_memalign
+#  include <emmintrin.h>
+#  undef posix_memalign
+#else
+#  include <emmintrin.h>
+#endif
+#endif
+
+// NEON intrinsics
+#if defined(QT_HAVE_NEON)
+#include <arm_neon.h>
+#endif
+
+
+// IWMMXT intrinsics
+#if defined(QT_HAVE_IWMMXT)
+#include <mmintrin.h>
+#if defined(Q_OS_WINCE)
+#  include "qplatformdefs.h"
+#endif
+#endif
+
+#if !defined(__IWMMXT__) && !defined(Q_OS_WINCE)
+#  include <xmmintrin.h>
+#elif defined(Q_OS_WINCE_STD) && defined(_X86_)
+#  pragma warning(disable: 4391)
+#  include <xmmintrin.h>
+#endif
+
+// 3D now intrinsics
+#if defined(QT_HAVE_3DNOW)
+#include <mm3dnow.h>
+#endif
+
+enum CPUFeatures {
+    None        = 0,
+    MMX         = 0x1,
+    MMXEXT      = 0x2,
+    MMX3DNOW    = 0x4,
+    MMX3DNOWEXT = 0x8,
+    SSE         = 0x10,
+    SSE2        = 0x20,
+    CMOV        = 0x40,
+    IWMMXT      = 0x80,
+    NEON        = 0x100
+};
+
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+Q_CORE_EXPORT uint qDetectCPUFeatures();
+
+#endif // QSIMD_P_H
diff --git a/src/corelib/tools/tools.pri b/src/corelib/tools/tools.pri
index 3406e41..6d64915 100644
--- a/src/corelib/tools/tools.pri
+++ b/src/corelib/tools/tools.pri
@@ -33,6 +33,7 @@ HEADERS +=  \
         tools/qsharedpointer.h \
         tools/qsharedpointer_impl.h \
         tools/qset.h \
+        tools/qsimd_p.h \
         tools/qsize.h \
         tools/qstack.h \
         tools/qstring.h \
@@ -68,6 +69,7 @@ SOURCES += \
         tools/qregexp.cpp \
         tools/qshareddata.cpp \
         tools/qsharedpointer.cpp \
+        tools/qsimd.cpp \
         tools/qsize.cpp \
         tools/qstring.cpp \
         tools/qstringbuilder.cpp \