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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>
#include <stdio.h>
#if defined(Q_OS_WINCE)
#include <windows.h>
#endif
#if defined(Q_OS_WIN64) && !defined(Q_CC_GNU)
#include <intrin.h>
#endif
#if defined(Q_OS_LINUX) && defined(__arm__)
#include "private/qcore_unix_p.h"
#include <asm/hwcap.h>
#include <linux/auxvec.h>
#endif
QT_BEGIN_NAMESPACE
#if defined (Q_OS_WINCE)
static inline uint detectProcessorFeatures()
{
#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(__arm__) || defined(__arm) || defined(QT_HAVE_IWMMXT) || defined(QT_HAVE_NEON)
static inline uint detectProcessorFeatures()
{
uint features = 0;
#if defined(Q_OS_LINUX)
int auxv = ::qt_safe_open("/proc/self/auxv", O_RDONLY);
if (auxv != -1) {
unsigned long vector[64];
int nread;
while (features == 0) {
nread = ::qt_safe_read(auxv, (char *)vector, sizeof vector);
if (nread <= 0) {
// EOF or error
break;
}
int max = nread / (sizeof vector[0]);
for (int i = 0; i < max; i += 2)
if (vector[i] == AT_HWCAP) {
if (vector[i+1] & HWCAP_IWMMXT)
features |= IWMMXT;
if (vector[i+1] & HWCAP_NEON)
features |= NEON;
break;
}
}
if (qgetenv("QT_NO_IWMMXT").toInt())
features ^= IWMMXT;
if (qgetenv("QT_NO_NEON").toInt())
features ^= NEON;
::qt_safe_close(auxv);
return features;
}
// fall back if /proc/self/auxv wasn't found
#endif
#if 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;
#elif defined(QT_HAVE_NEON)
static const bool doNEON = !qgetenv("QT_NO_NEON").toInt();
features = doNEON ? NEON : 0;
#endif
return features;
}
#elif defined(__i386__) || defined(_M_IX86)
static inline uint detectProcessorFeatures()
{
uint features = 0;
unsigned int extended_result = 0;
unsigned int feature_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"
"mov %%ecx, %1\n"
: "=r" (result), "=r" (feature_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
mov feature_result, ecx
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;
if (feature_result & (1u))
features |= SSE3;
if (feature_result & (1u << 9))
features |= SSSE3;
if (feature_result & (1u << 19))
features |= SSE4_1;
if (feature_result & (1u << 20))
features |= SSE4_2;
if (feature_result & (1u << 28))
features |= AVX;
#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;
}
#elif defined(__x86_64) || defined(Q_OS_WIN64)
static inline uint detectProcessorFeatures()
{
uint features = MMX|SSE|SSE2|CMOV;
uint feature_result = 0;
#if defined(Q_CC_GNU)
asm ("push %%rbx\n"
"pushf\n"
"pop %%rax\n"
"mov %%eax, %%ebx\n"
"xor $0x00200000, %%eax\n"
"push %%rax\n"
"popf\n"
"pushf\n"
"pop %%rax\n"
"xor %%edx, %%edx\n"
"xor %%ebx, %%eax\n"
"jz 1f\n"
"mov $0x00000001, %%eax\n"
"cpuid\n"
"1:\n"
"pop %%rbx\n"
"mov %%ecx, %0\n"
: "=r" (feature_result)
:
: "%eax", "%ecx", "%edx"
);
#elif defined (Q_OS_WIN64)
{
int info[4];
__cpuid(info, 1);
feature_result = info[2];
}
#endif
if (feature_result & (1u))
features |= SSE3;
if (feature_result & (1u << 9))
features |= SSSE3;
if (feature_result & (1u << 19))
features |= SSE4_1;
if (feature_result & (1u << 20))
features |= SSE4_2;
if (feature_result & (1u << 28))
features |= AVX;
#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
}
#elif defined(__ia64__)
static inline uint detectProcessorFeatures()
{
return MMX|SSE|SSE2;
}
#else
static inline uint detectProcessorFeatures()
{
return 0;
}
#endif
uint qDetectCPUFeatures()
{
static QBasicAtomicInt features = Q_BASIC_ATOMIC_INITIALIZER(-1);
if (features != -1)
return features;
features = detectProcessorFeatures();
return features;
}
void qDumpCPUFeatures()
{
/*
* Use kdesdk/scripts/generate_string_table.pl to update the table below.
* Here's the data:
mmx
mmxext
mmx3dnow
mmx3dnowext
sse
sse2
cmov
iwmmxt
neon
sse3
ssse3
sse4.1
sse4.2
avx
*/
static const char features_string[] =
"mmx\0"
"mmxext\0"
"mmx3dnow\0"
"mmx3dnowext\0"
"sse\0"
"sse2\0"
"cmov\0"
"iwmmxt\0"
"neon\0"
"sse3\0"
"ssse3\0"
"sse4.1\0"
"sse4.2\0"
"avx\0"
"\0";
static const int features_indices[] = {
0, 4, 11, 20, 32, 36, 41, 46,
53, 58, 63, 69, 76, 83, -1
};
const int features_count = (sizeof features_indices - 1) / (sizeof features_indices[0]);
uint features = qDetectCPUFeatures();
printf("Processor features: ");
for (int i = 0; i < features_count; ++i) {
if (features & (1 << i))
printf(" %s", features_string + features_indices[i]);
}
puts("");
}
QT_END_NAMESPACE
|