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/****************************************************************************
**
** 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()
{
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
|
