--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/corelib/tools/qsimd.cpp Tue Jul 06 15:10:48 2010 +0300
@@ -0,0 +1,250 @@
+/****************************************************************************
+**
+** 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>
+
+#if defined(Q_OS_WINCE)
+#include <windows.h>
+#endif
+
+QT_BEGIN_NAMESPACE
+
+uint qDetectCPUFeatures()
+{
+ static uint features = 0xffffffff;
+ if (features != 0xffffffff)
+ return features;
+
+#if defined (Q_OS_WINCE)
+#if defined (ARM)
+ if (IsProcessorFeaturePresent(PF_ARM_INTEL_WMMX)) {
+ features = IWMMXT;
+ return features;
+ }
+#elif defined(_X86_)
+ 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
+ features = 0;
+ return features;
+#elif defined(QT_HAVE_IWMMXT)
+ // runtime detection only available when running as a previlegied process
+ static const bool doIWMMXT = !qgetenv("QT_NO_IWMMXT").toInt();
+ features = doIWMMXT ? IWMMXT : 0;
+ return features;
+#elif defined(QT_HAVE_NEON)
+ static const bool doNEON = !qgetenv("QT_NO_NEON").toInt();
+ features = doNEON ? NEON : 0;
+ return features;
+#else
+ 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 defined(QT_HAVE_MMX)
+ if (qgetenv("QT_NO_MMX").toInt())
+ features ^= MMX;
+#endif
+ if (qgetenv("QT_NO_MMXEXT").toInt())
+ features ^= MMXEXT;
+
+#if defined(QT_HAVE_3DNOW)
+ if (qgetenv("QT_NO_3DNOW").toInt())
+ features ^= MMX3DNOW;
+#endif
+ if (qgetenv("QT_NO_3DNOWEXT").toInt())
+ features ^= MMX3DNOWEXT;
+
+#if defined(QT_HAVE_SSE)
+ if (qgetenv("QT_NO_SSE").toInt())
+ features ^= SSE;
+#endif
+#if defined(QT_HAVE_SSE2)
+ if (qgetenv("QT_NO_SSE2").toInt())
+ features ^= SSE2;
+#endif
+
+ return features;
+#endif
+}
+
+QT_END_NAMESPACE