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Diffstat (limited to 'src/corelib/arch/qatomic_armv6.h')
-rw-r--r-- | src/corelib/arch/qatomic_armv6.h | 833 |
1 files changed, 0 insertions, 833 deletions
diff --git a/src/corelib/arch/qatomic_armv6.h b/src/corelib/arch/qatomic_armv6.h deleted file mode 100644 index b2ea85ada2..0000000000 --- a/src/corelib/arch/qatomic_armv6.h +++ /dev/null @@ -1,833 +0,0 @@ -/**************************************************************************** -** -** Copyright (C) 2015 The Qt Company Ltd. -** Copyright (C) 2011 Thiago Macieira <thiago@kde.org> -** Contact: http://www.qt.io/licensing/ -** -** This file is part of the QtCore module of the Qt Toolkit. -** -** $QT_BEGIN_LICENSE:LGPL21$ -** Commercial License Usage -** Licensees holding valid commercial Qt licenses may use this file in -** accordance with the commercial license agreement provided with the -** Software or, alternatively, in accordance with the terms contained in -** a written agreement between you and The Qt Company. For licensing terms -** and conditions see http://www.qt.io/terms-conditions. For further -** information use the contact form at http://www.qt.io/contact-us. -** -** 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 or version 3 as published by the Free -** Software Foundation and appearing in the file LICENSE.LGPLv21 and -** LICENSE.LGPLv3 included in the packaging of this file. Please review the -** following information to ensure the GNU Lesser General Public License -** requirements will be met: https://www.gnu.org/licenses/lgpl.html and -** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. -** -** As a special exception, The Qt Company gives you certain additional -** rights. These rights are described in The Qt Company LGPL Exception -** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. -** -** $QT_END_LICENSE$ -** -****************************************************************************/ - -#ifndef QATOMIC_ARMV6_H -#define QATOMIC_ARMV6_H - -#include <QtCore/qgenericatomic.h> - -QT_BEGIN_NAMESPACE - -#if 0 -// silence syncqt warnings -QT_END_NAMESPACE -#pragma qt_sync_skip_header_check -#pragma qt_sync_stop_processing -#endif - -#define Q_ATOMIC_INT_REFERENCE_COUNTING_IS_ALWAYS_NATIVE -#define Q_ATOMIC_INT_TEST_AND_SET_IS_ALWAYS_NATIVE -#define Q_ATOMIC_INT_FETCH_AND_STORE_IS_ALWAYS_NATIVE -#define Q_ATOMIC_INT_FETCH_AND_ADD_IS_ALWAYS_NATIVE - -#define Q_ATOMIC_INT32_IS_SUPPORTED -#define Q_ATOMIC_INT32_REFERENCE_COUNTING_IS_ALWAYS_NATIVE -#define Q_ATOMIC_INT32_TEST_AND_SET_IS_ALWAYS_NATIVE -#define Q_ATOMIC_INT32_FETCH_AND_STORE_IS_ALWAYS_NATIVE -#define Q_ATOMIC_INT32_FETCH_AND_ADD_IS_ALWAYS_NATIVE - -#define Q_ATOMIC_POINTER_TEST_AND_SET_IS_ALWAYS_NATIVE -#define Q_ATOMIC_POINTER_FETCH_AND_STORE_IS_ALWAYS_NATIVE -#define Q_ATOMIC_POINTER_FETCH_AND_ADD_IS_ALWAYS_NATIVE - -template <int size> struct QBasicAtomicOps: QGenericAtomicOps<QBasicAtomicOps<size> > -{ - template <typename T> - static void orderedMemoryFence(const T &) Q_DECL_NOTHROW; - - static inline Q_DECL_CONSTEXPR bool isReferenceCountingNative() Q_DECL_NOTHROW { return true; } - template <typename T> static bool ref(T &_q_value) Q_DECL_NOTHROW; - template <typename T> static bool deref(T &_q_value) Q_DECL_NOTHROW; - - static inline Q_DECL_CONSTEXPR bool isTestAndSetNative() Q_DECL_NOTHROW { return true; } - static inline Q_DECL_CONSTEXPR bool isTestAndSetWaitFree() Q_DECL_NOTHROW { return false; } - template <typename T> static bool testAndSetRelaxed(T &_q_value, T expectedValue, T newValue) Q_DECL_NOTHROW; - template <typename T> static bool testAndSetRelaxed(T &_q_value, T expectedValue, - T newValue, T *currentValue) Q_DECL_NOTHROW; - - static inline Q_DECL_CONSTEXPR bool isFetchAndStoreNative() Q_DECL_NOTHROW { return true; } - template <typename T> static T fetchAndStoreRelaxed(T &_q_value, T newValue) Q_DECL_NOTHROW; - - static inline Q_DECL_CONSTEXPR bool isFetchAndAddNative() Q_DECL_NOTHROW { return true; } - template <typename T> static - T fetchAndAddRelaxed(T &_q_value, typename QAtomicAdditiveType<T>::AdditiveT valueToAdd) Q_DECL_NOTHROW; - -private: - template <typename T> static inline T shrinkFrom32Bit(T value); - template <typename T> static inline T extendTo32Bit(T value); -}; - -template <typename T> struct QAtomicOps : QBasicAtomicOps<sizeof(T)> -{ - // this is GCC or GCC-like, so we can use extensions: - // force the alignment to be the size of the type, as on some ABIs the alignment - // of 64-bit types is 32-bit. We need proper alignment for LDREX / STREX. - typedef __attribute__((__aligned__(sizeof(T)))) T Type; -}; - -#ifndef Q_CC_RVCT - -#ifndef Q_DATA_MEMORY_BARRIER -# define Q_DATA_MEMORY_BARRIER asm volatile("mcr p15, 0, r0, c7, c10, 5":::"memory") -#endif -#ifndef Q_COMPILER_MEMORY_BARRIER -# define Q_COMPILER_MEMORY_BARRIER asm volatile("":::"memory") -#endif - -template<> template<typename T> inline -bool QBasicAtomicOps<4>::ref(T &_q_value) Q_DECL_NOTHROW -{ - T newValue; - int result; - asm volatile("0:\n" - "ldrex %[newValue], [%[_q_value]]\n" - "add %[newValue], %[newValue], #1\n" - "strex %[result], %[newValue], [%[_q_value]]\n" - "teq %[result], #0\n" - "bne 0b\n" - : [newValue] "=&r" (newValue), - [result] "=&r" (result), - "+m" (_q_value) - : [_q_value] "r" (&_q_value) - : "cc", "memory"); - return newValue != 0; -} - -template<> template <typename T> inline -bool QBasicAtomicOps<4>::deref(T &_q_value) Q_DECL_NOTHROW -{ - T newValue; - int result; - asm volatile("0:\n" - "ldrex %[newValue], [%[_q_value]]\n" - "sub %[newValue], %[newValue], #1\n" - "strex %[result], %[newValue], [%[_q_value]]\n" - "teq %[result], #0\n" - "bne 0b\n" - : [newValue] "=&r" (newValue), - [result] "=&r" (result), - "+m" (_q_value) - : [_q_value] "r" (&_q_value) - : "cc", "memory"); - return newValue != 0; -} - -template<> template <typename T> inline -bool QBasicAtomicOps<4>::testAndSetRelaxed(T &_q_value, T expectedValue, T newValue) Q_DECL_NOTHROW -{ - int result; - asm volatile("0:\n" - "ldrex %[result], [%[_q_value]]\n" - "eors %[result], %[result], %[expectedValue]\n" - "itt eq\n" - "strexeq %[result], %[newValue], [%[_q_value]]\n" - "teqeq %[result], #1\n" - "beq 0b\n" - : [result] "=&r" (result), - "+m" (_q_value) - : [expectedValue] "r" (expectedValue), - [newValue] "r" (newValue), - [_q_value] "r" (&_q_value) - : "cc"); - return result == 0; -} - -template<> template <typename T> inline -bool QBasicAtomicOps<4>::testAndSetRelaxed(T &_q_value, T expectedValue, T newValue, T *currentValue) Q_DECL_NOTHROW -{ - T tempValue; - int result; - asm volatile("0:\n" - "ldrex %[tempValue], [%[_q_value]]\n" - "eors %[result], %[tempValue], %[expectedValue]\n" - "itt eq\n" - "strexeq %[result], %[newValue], [%[_q_value]]\n" - "teqeq %[result], #1\n" - "beq 0b\n" - : [result] "=&r" (result), - [tempValue] "=&r" (tempValue), - "+m" (_q_value) - : [expectedValue] "r" (expectedValue), - [newValue] "r" (newValue), - [_q_value] "r" (&_q_value) - : "cc"); - *currentValue = tempValue; - return result == 0; -} - -template<> template <typename T> inline -T QBasicAtomicOps<4>::fetchAndStoreRelaxed(T &_q_value, T newValue) Q_DECL_NOTHROW -{ - T originalValue; - int result; - asm volatile("0:\n" - "ldrex %[originalValue], [%[_q_value]]\n" - "strex %[result], %[newValue], [%[_q_value]]\n" - "teq %[result], #0\n" - "bne 0b\n" - : [originalValue] "=&r" (originalValue), - [result] "=&r" (result), - "+m" (_q_value) - : [newValue] "r" (newValue), - [_q_value] "r" (&_q_value) - : "cc"); - return originalValue; -} - -template<> template <typename T> inline -T QBasicAtomicOps<4>::fetchAndAddRelaxed(T &_q_value, typename QAtomicAdditiveType<T>::AdditiveT valueToAdd) Q_DECL_NOTHROW -{ - T originalValue; - T newValue; - int result; - asm volatile("0:\n" - "ldrex %[originalValue], [%[_q_value]]\n" - "add %[newValue], %[originalValue], %[valueToAdd]\n" - "strex %[result], %[newValue], [%[_q_value]]\n" - "teq %[result], #0\n" - "bne 0b\n" - : [originalValue] "=&r" (originalValue), - [newValue] "=&r" (newValue), - [result] "=&r" (result), - "+m" (_q_value) - : [valueToAdd] "r" (valueToAdd * QAtomicAdditiveType<T>::AddScale), - [_q_value] "r" (&_q_value) - : "cc"); - return originalValue; -} - -#if defined(__ARM_ARCH_7__) \ - || defined(__ARM_ARCH_7A__) \ - || defined(__ARM_ARCH_7R__) \ - || defined(__ARM_ARCH_7M__) \ - || defined(__ARM_ARCH_6K__) -// LDREXB, LDREXH and LDREXD are available on ARMv6K or higher - -template<> struct QAtomicOpsSupport<1> { enum { IsSupported = 1 }; }; -template<> struct QAtomicOpsSupport<2> { enum { IsSupported = 1 }; }; -template<> struct QAtomicOpsSupport<8> { enum { IsSupported = 1 }; }; - -#define Q_ATOMIC_INT8_IS_SUPPORTED -#define Q_ATOMIC_INT8_REFERENCE_COUNTING_IS_ALWAYS_NATIVE -#define Q_ATOMIC_INT8_TEST_AND_SET_IS_ALWAYS_NATIVE -#define Q_ATOMIC_INT8_FETCH_AND_STORE_IS_ALWAYS_NATIVE -#define Q_ATOMIC_INT8_FETCH_AND_ADD_IS_ALWAYS_NATIVE - -#define Q_ATOMIC_INT16_IS_SUPPORTED -#define Q_ATOMIC_INT16_REFERENCE_COUNTING_IS_ALWAYS_NATIVE -#define Q_ATOMIC_INT16_TEST_AND_SET_IS_ALWAYS_NATIVE -#define Q_ATOMIC_INT16_FETCH_AND_STORE_IS_ALWAYS_NATIVE -#define Q_ATOMIC_INT16_FETCH_AND_ADD_IS_ALWAYS_NATIVE - -#define Q_ATOMIC_INT64_IS_SUPPORTED -#define Q_ATOMIC_INT64_REFERENCE_COUNTING_IS_ALWAYS_NATIVE -#define Q_ATOMIC_INT64_TEST_AND_SET_IS_ALWAYS_NATIVE -#define Q_ATOMIC_INT64_FETCH_AND_STORE_IS_ALWAYS_NATIVE -#define Q_ATOMIC_INT64_FETCH_AND_ADD_IS_ALWAYS_NATIVE - -// note: if T is signed, parameters are passed sign-extended in the -// registers. However, our 8- and 16-bit operations don't do sign -// extension. So we need to clear out the input on entry and sign-extend again -// on exit. -template<int Size> template <typename T> -T QBasicAtomicOps<Size>::shrinkFrom32Bit(T value) -{ - Q_STATIC_ASSERT(Size == 1 || Size == 2); - if (T(-1) > T(0)) - return value; // unsigned, ABI will zero extend - if (Size == 1) - asm volatile("and %0, %0, %1" : "+r" (value) : "I" (0xff)); - else - asm volatile("and %0, %0, %1" : "+r" (value) : "r" (0xffff)); - return value; -} - -template<int Size> template <typename T> -T QBasicAtomicOps<Size>::extendTo32Bit(T value) -{ - Q_STATIC_ASSERT(Size == 1 || Size == 2); - if (T(-1) > T(0)) - return value; // unsigned, ABI will zero extend - if (Size == 1) - asm volatile("sxtb %0, %0" : "+r" (value)); - else - asm volatile("sxth %0, %0" : "+r" (value)); - return value; -} - -template<> template<typename T> inline -bool QBasicAtomicOps<1>::ref(T &_q_value) Q_DECL_NOTHROW -{ - T newValue; - int result; - asm volatile("0:\n" - "ldrexb %[newValue], [%[_q_value]]\n" - "add %[newValue], %[newValue], #1\n" - "strexb %[result], %[newValue], [%[_q_value]]\n" - "teq %[result], #0\n" - "bne 0b\n" - : [newValue] "=&r" (newValue), - [result] "=&r" (result), - "+m" (_q_value) - : [_q_value] "r" (&_q_value) - : "cc", "memory"); - return newValue != 0; -} - -template<> template <typename T> inline -bool QBasicAtomicOps<1>::deref(T &_q_value) Q_DECL_NOTHROW -{ - T newValue; - int result; - asm volatile("0:\n" - "ldrexb %[newValue], [%[_q_value]]\n" - "sub %[newValue], %[newValue], #1\n" - "strexb %[result], %[newValue], [%[_q_value]]\n" - "teq %[result], #0\n" - "bne 0b\n" - : [newValue] "=&r" (newValue), - [result] "=&r" (result), - "+m" (_q_value) - : [_q_value] "r" (&_q_value) - : "cc", "memory"); - return newValue != 0; -} - -template<> template <typename T> inline -bool QBasicAtomicOps<1>::testAndSetRelaxed(T &_q_value, T expectedValue, T newValue) Q_DECL_NOTHROW -{ - T result; - asm volatile("0:\n" - "ldrexb %[result], [%[_q_value]]\n" - "eors %[result], %[result], %[expectedValue]\n" - "itt eq\n" - "strexbeq %[result], %[newValue], [%[_q_value]]\n" - "teqeq %[result], #1\n" - "beq 0b\n" - : [result] "=&r" (result), - "+m" (_q_value) - : [expectedValue] "r" (shrinkFrom32Bit(expectedValue)), - [newValue] "r" (newValue), - [_q_value] "r" (&_q_value) - : "cc"); - return result == 0; -} - -template<> template <typename T> inline -bool QBasicAtomicOps<1>::testAndSetRelaxed(T &_q_value, T expectedValue, T newValue, T *currentValue) Q_DECL_NOTHROW -{ - T tempValue; - T result; - asm volatile("0:\n" - "ldrexb %[tempValue], [%[_q_value]]\n" - "eors %[result], %[tempValue], %[expectedValue]\n" - "itt eq\n" - "strexbeq %[result], %[newValue], [%[_q_value]]\n" - "teqeq %[result], #1\n" - "beq 0b\n" - : [result] "=&r" (result), - [tempValue] "=&r" (tempValue), - "+m" (_q_value) - : [expectedValue] "r" (shrinkFrom32Bit(expectedValue)), - [newValue] "r" (newValue), - [_q_value] "r" (&_q_value) - : "cc"); - *currentValue = extendTo32Bit(tempValue); - return result == 0; -} - -template<> template <typename T> inline -T QBasicAtomicOps<1>::fetchAndStoreRelaxed(T &_q_value, T newValue) Q_DECL_NOTHROW -{ - T originalValue; - int result; - asm volatile("0:\n" - "ldrexb %[originalValue], [%[_q_value]]\n" - "strexb %[result], %[newValue], [%[_q_value]]\n" - "teq %[result], #0\n" - "bne 0b\n" - : [originalValue] "=&r" (originalValue), - [result] "=&r" (result), - "+m" (_q_value) - : [newValue] "r" (newValue), - [_q_value] "r" (&_q_value) - : "cc"); - return extendTo32Bit(originalValue); -} - -template<> template <typename T> inline -T QBasicAtomicOps<1>::fetchAndAddRelaxed(T &_q_value, typename QAtomicAdditiveType<T>::AdditiveT valueToAdd) Q_DECL_NOTHROW -{ - T originalValue; - T newValue; - int result; - asm volatile("0:\n" - "ldrexb %[originalValue], [%[_q_value]]\n" - "add %[newValue], %[originalValue], %[valueToAdd]\n" - "strexb %[result], %[newValue], [%[_q_value]]\n" - "teq %[result], #0\n" - "bne 0b\n" - : [originalValue] "=&r" (originalValue), - [newValue] "=&r" (newValue), - [result] "=&r" (result), - "+m" (_q_value) - : [valueToAdd] "r" (valueToAdd * QAtomicAdditiveType<T>::AddScale), - [_q_value] "r" (&_q_value) - : "cc"); - return extendTo32Bit(originalValue); -} - -template<> template<typename T> inline -bool QBasicAtomicOps<2>::ref(T &_q_value) Q_DECL_NOTHROW -{ - T newValue; - int result; - asm volatile("0:\n" - "ldrexh %[newValue], [%[_q_value]]\n" - "add %[newValue], %[newValue], #1\n" - "strexh %[result], %[newValue], [%[_q_value]]\n" - "teq %[result], #0\n" - "bne 0b\n" - : [newValue] "=&r" (newValue), - [result] "=&r" (result), - "+m" (_q_value) - : [_q_value] "r" (&_q_value) - : "cc", "memory"); - return newValue != 0; -} - -template<> template <typename T> inline -bool QBasicAtomicOps<2>::deref(T &_q_value) Q_DECL_NOTHROW -{ - T newValue; - int result; - asm volatile("0:\n" - "ldrexh %[newValue], [%[_q_value]]\n" - "sub %[newValue], %[newValue], #1\n" - "strexh %[result], %[newValue], [%[_q_value]]\n" - "teq %[result], #0\n" - "bne 0b\n" - : [newValue] "=&r" (newValue), - [result] "=&r" (result), - "+m" (_q_value) - : [_q_value] "r" (&_q_value) - : "cc", "memory"); - return newValue != 0; -} - -template<> template <typename T> inline -bool QBasicAtomicOps<2>::testAndSetRelaxed(T &_q_value, T expectedValue, T newValue) Q_DECL_NOTHROW -{ - T result; - asm volatile("0:\n" - "ldrexh %[result], [%[_q_value]]\n" - "eors %[result], %[result], %[expectedValue]\n" - "itt eq\n" - "strexheq %[result], %[newValue], [%[_q_value]]\n" - "teqeq %[result], #1\n" - "beq 0b\n" - : [result] "=&r" (result), - "+m" (_q_value) - : [expectedValue] "r" (shrinkFrom32Bit(expectedValue)), - [newValue] "r" (newValue), - [_q_value] "r" (&_q_value) - : "cc"); - return result == 0; -} - -template<> template <typename T> inline -bool QBasicAtomicOps<2>::testAndSetRelaxed(T &_q_value, T expectedValue, T newValue, T *currentValue) Q_DECL_NOTHROW -{ - T tempValue; - T result; - asm volatile("0:\n" - "ldrexh %[tempValue], [%[_q_value]]\n" - "eors %[result], %[tempValue], %[expectedValue]\n" - "itt eq\n" - "strexheq %[result], %[newValue], [%[_q_value]]\n" - "teqeq %[result], #1\n" - "beq 0b\n" - : [result] "=&r" (result), - [tempValue] "=&r" (tempValue), - "+m" (_q_value) - : [expectedValue] "r" (shrinkFrom32Bit(expectedValue)), - [newValue] "r" (newValue), - [_q_value] "r" (&_q_value) - : "cc"); - *currentValue = extendTo32Bit(tempValue); - return result == 0; -} - -template<> template <typename T> inline -T QBasicAtomicOps<2>::fetchAndStoreRelaxed(T &_q_value, T newValue) Q_DECL_NOTHROW -{ - T originalValue; - int result; - asm volatile("0:\n" - "ldrexh %[originalValue], [%[_q_value]]\n" - "strexh %[result], %[newValue], [%[_q_value]]\n" - "teq %[result], #0\n" - "bne 0b\n" - : [originalValue] "=&r" (originalValue), - [result] "=&r" (result), - "+m" (_q_value) - : [newValue] "r" (newValue), - [_q_value] "r" (&_q_value) - : "cc"); - return extendTo32Bit(originalValue); -} - -template<> template <typename T> inline -T QBasicAtomicOps<2>::fetchAndAddRelaxed(T &_q_value, typename QAtomicAdditiveType<T>::AdditiveT valueToAdd) Q_DECL_NOTHROW -{ - T originalValue; - T newValue; - int result; - asm volatile("0:\n" - "ldrexh %[originalValue], [%[_q_value]]\n" - "add %[newValue], %[originalValue], %[valueToAdd]\n" - "strexh %[result], %[newValue], [%[_q_value]]\n" - "teq %[result], #0\n" - "bne 0b\n" - : [originalValue] "=&r" (originalValue), - [newValue] "=&r" (newValue), - [result] "=&r" (result), - "+m" (_q_value) - : [valueToAdd] "r" (valueToAdd * QAtomicAdditiveType<T>::AddScale), - [_q_value] "r" (&_q_value) - : "cc"); - return extendTo32Bit(originalValue); -} - -// Explanation from GCC's source code (config/arm/arm.c) on the modifiers below: -// Whenever you use "r" (dwordVariable), you get assigned a register pair: -// %[reg] - lower-numbered register -// %H[reg] - higher-numbered register -// %Q[reg] - low part of the value -// %R[reg] - high part of the value -// If this is a little-endian build, H and R are the same; otherwise, H and Q are the same. - -template<> template<typename T> inline -bool QBasicAtomicOps<8>::ref(T &_q_value) Q_DECL_NOTHROW -{ - T newValue; - int result; - asm volatile("0:\n" - "ldrexd %[newValue], %H[newValue], [%[_q_value]]\n" - "adds %Q[newValue], %Q[newValue], #1\n" - "adc %R[newValue], %R[newValue], #0\n" - "strexd %[result], %[newValue], %H[newValue], [%[_q_value]]\n" - "teq %[result], #0\n" - "bne 0b\n" - : [newValue] "=&r" (newValue), - [result] "=&r" (result), - "+m" (_q_value) - : [_q_value] "r" (&_q_value) - : "cc", "memory"); - return newValue != 0; -} - -template<> template <typename T> inline -bool QBasicAtomicOps<8>::deref(T &_q_value) Q_DECL_NOTHROW -{ - T newValue; - int result; - asm volatile("0:\n" - "ldrexd %[newValue], %H[newValue], [%[_q_value]]\n" - "subs %Q[newValue], %Q[newValue], #1\n" - "sbc %R[newValue], %R[newValue], #0\n" - "strexd %[result], %[newValue], %H[newValue], [%[_q_value]]\n" - "teq %[result], #0\n" - "bne 0b\n" - : [newValue] "=&r" (newValue), - [result] "=&r" (result), - "+m" (_q_value) - : [_q_value] "r" (&_q_value) - : "cc", "memory"); - return newValue != 0; -} - -template<> template <typename T> inline -bool QBasicAtomicOps<8>::testAndSetRelaxed(T &_q_value, T expectedValue, T newValue) Q_DECL_NOTHROW -{ - T result; - asm volatile("0:\n" - "ldrexd %[result], %H[result], [%[_q_value]]\n" - "eor %[result], %[result], %[expectedValue]\n" - "eor %H[result], %H[result], %H[expectedValue]\n" - "orrs %[result], %[result], %H[result]\n" - "itt eq\n" - "strexdeq %[result], %[newValue], %H[newValue], [%[_q_value]]\n" - "teqeq %[result], #1\n" - "beq 0b\n" - : [result] "=&r" (result), - "+m" (_q_value) - : [expectedValue] "r" (expectedValue), - [newValue] "r" (newValue), - [_q_value] "r" (&_q_value) - : "cc"); - return quint32(result) == 0; -} - -template<> template <typename T> inline -bool QBasicAtomicOps<8>::testAndSetRelaxed(T &_q_value, T expectedValue, T newValue, T *currentValue) Q_DECL_NOTHROW -{ - T tempValue; - T result; - asm volatile("0:\n" - "ldrexd %[tempValue], %H[tempValue], [%[_q_value]]\n" - "eor %[result], %[tempValue], %[expectedValue]\n" - "eor %H[result], %H[tempValue], %H[expectedValue]\n" - "orrs %[result], %[result], %H[result]\n" - "itt eq\n" - "strexdeq %[result], %[newValue], %H[newValue], [%[_q_value]]\n" - "teqeq %[result], #1\n" - "beq 0b\n" - : [result] "=&r" (result), - [tempValue] "=&r" (tempValue), - "+m" (_q_value) - : [expectedValue] "r" (expectedValue), - [newValue] "r" (newValue), - [_q_value] "r" (&_q_value) - : "cc"); - *currentValue = tempValue; - return quint32(result) == 0; -} - -template<> template <typename T> inline -T QBasicAtomicOps<8>::fetchAndStoreRelaxed(T &_q_value, T newValue) Q_DECL_NOTHROW -{ - T originalValue; - int result; - asm volatile("0:\n" - "ldrexd %[originalValue], %H[originalValue], [%[_q_value]]\n" - "strexd %[result], %[newValue], %H[newValue], [%[_q_value]]\n" - "teq %[result], #0\n" - "bne 0b\n" - : [originalValue] "=&r" (originalValue), - [result] "=&r" (result), - "+m" (_q_value) - : [newValue] "r" (newValue), - [_q_value] "r" (&_q_value) - : "cc"); - return originalValue; -} - -template<> template <typename T> inline -T QBasicAtomicOps<8>::fetchAndAddRelaxed(T &_q_value, typename QAtomicAdditiveType<T>::AdditiveT valueToAdd) Q_DECL_NOTHROW -{ - T originalValue; - T newValue; - int result; - asm volatile("0:\n" - "ldrexd %[originalValue], %H[originalValue], [%[_q_value]]\n" - "adds %Q[newValue], %Q[originalValue], %Q[valueToAdd]\n" - "adc %R[newValue], %R[originalValue], %R[valueToAdd]\n" - "strexd %[result], %[newValue], %H[newValue], [%[_q_value]]\n" - "teq %[result], #0\n" - "bne 0b\n" - : [originalValue] "=&r" (originalValue), - [newValue] "=&r" (newValue), - [result] "=&r" (result), - "+m" (_q_value) - : [valueToAdd] "r" (valueToAdd * QAtomicAdditiveType<T>::AddScale), - [_q_value] "r" (&_q_value) - : "cc"); - return originalValue; -} - -#endif - -#else -// This is Q_CC_RVCT - -// RVCT inline assembly documentation: -// http://www.keil.com/support/man/docs/armcc/armcc_chdcffdb.htm -// RVCT embedded assembly documentation: -// http://www.keil.com/support/man/docs/armcc/armcc_chddbeib.htm - -#if __TARGET_ARCH_THUMB-0 < 4 -// save our pragma state and switch to ARM mode (unless using Thumb2) -# pragma push -# pragma arm -#endif - -#ifndef Q_DATA_MEMORY_BARRIER -# define Q_DATA_MEMORY_BARRIER __schedule_barrier() -#endif -#ifndef Q_COMPILER_MEMORY_BARRIER -# define Q_COMPILER_MEMORY_BARRIER __schedule_barrier() -#endif - -inline bool QBasicAtomicInt::ref() Q_DECL_NOTHROW -{ - int newValue; - int result; - retry: - __asm { - ldrex newValue, [&_q_value] - add newValue, newValue, #1 - strex result, newValue, [&_q_value] - teq result, #0 - bne retry - } - return newValue != 0; -} - -inline bool QBasicAtomicInt::deref() Q_DECL_NOTHROW -{ - int newValue; - int result; - retry: - __asm { - ldrex newValue, [&_q_value] - sub newValue, newValue, #1 - strex result, newValue, [&_q_value] - teq result, #0 - bne retry - } - return newValue != 0; -} - -inline bool QBasicAtomicInt::testAndSetRelaxed(int expectedValue, int newValue) Q_DECL_NOTHROW -{ - int result; - retry: - __asm { - ldrex result, [&_q_value] - eors result, result, expectedValue - strexeq result, newValue, [&_q_value] - teqeq result, #1 - beq retry - } - return result == 0; -} - -inline int QBasicAtomicInt::fetchAndStoreRelaxed(int newValue) Q_DECL_NOTHROW -{ - int originalValue; - int result; - retry: - __asm { - ldrex originalValue, [&_q_value] - strex result, newValue, [&_q_value] - teq result, #0 - bne retry - } - return originalValue; -} - -inline int QBasicAtomicInt::fetchAndAddRelaxed(int valueToAdd) Q_DECL_NOTHROW -{ - int originalValue; - int newValue; - int result; - retry: - __asm { - ldrex originalValue, [&_q_value] - add newValue, originalValue, valueToAdd - strex result, newValue, [&_q_value] - teq result, #0 - bne retry - } - return originalValue; -} - -template <typename T> -Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::testAndSetRelaxed(T *expectedValue, T *newValue) Q_DECL_NOTHROW -{ - T *result; - retry: - __asm { - ldrex result, [&_q_value] - eors result, result, expectedValue - strexeq result, newValue, [&_q_value] - teqeq result, #1 - beq retry - } - return result == 0; -} - -template <typename T> -Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndStoreRelaxed(T *newValue) Q_DECL_NOTHROW -{ - T *originalValue; - int result; - retry: - __asm { - ldrex originalValue, [&_q_value] - strex result, newValue, [&_q_value] - teq result, #0 - bne retry - } - return originalValue; -} - -template <typename T> -Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndAddRelaxed(qptrdiff valueToAdd) Q_DECL_NOTHROW -{ - T *originalValue; - T *newValue; - int result; - retry: - __asm { - ldrex originalValue, [&_q_value] - add newValue, originalValue, valueToAdd * sizeof(T) - strex result, newValue, [&_q_value] - teq result, #0 - bne retry - } - return originalValue; -} - -#if __TARGET_ARCH_THUMB-0 < 4 -# pragma pop -#endif - -#endif - -// common code - -template <int size> template <typename T> inline -void QBasicAtomicOps<size>::orderedMemoryFence(const T &) Q_DECL_NOTHROW -{ - Q_DATA_MEMORY_BARRIER; -} - -#undef Q_DATA_MEMORY_BARRIER -#undef Q_COMPILER_MEMORY_BARRIER - -QT_END_NAMESPACE - -#endif // QATOMIC_ARMV6_H |