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author | bunnei <bunneidev@gmail.com> | 2014-09-05 02:36:21 +0200 |
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committer | bunnei <bunneidev@gmail.com> | 2014-09-05 02:36:21 +0200 |
commit | 5d95d038a0e5d203a568223da12b57c30d048a8c (patch) | |
tree | 7aaaa7f594244f81c2fc813d40e099a5bbc1a9e8 /src/common/atomic_gcc.h | |
parent | Merge pull request #89 from archshift/X11-OSX (diff) | |
parent | Removed common/atomic, instead using std::atomic (diff) | |
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Diffstat (limited to 'src/common/atomic_gcc.h')
-rw-r--r-- | src/common/atomic_gcc.h | 110 |
1 files changed, 0 insertions, 110 deletions
diff --git a/src/common/atomic_gcc.h b/src/common/atomic_gcc.h deleted file mode 100644 index 117e342f6..000000000 --- a/src/common/atomic_gcc.h +++ /dev/null @@ -1,110 +0,0 @@ -// Copyright 2013 Dolphin Emulator Project -// Licensed under GPLv2 -// Refer to the license.txt file included. - -#pragma once - -#include "common/common.h" - -// Atomic operations are performed in a single step by the CPU. It is -// impossible for other threads to see the operation "half-done." -// -// Some atomic operations can be combined with different types of memory -// barriers called "Acquire semantics" and "Release semantics", defined below. -// -// Acquire semantics: Future memory accesses cannot be relocated to before the -// operation. -// -// Release semantics: Past memory accesses cannot be relocated to after the -// operation. -// -// These barriers affect not only the compiler, but also the CPU. - -namespace Common -{ - -inline void AtomicAdd(volatile u32& target, u32 value) { - __sync_add_and_fetch(&target, value); -} - -inline void AtomicAnd(volatile u32& target, u32 value) { - __sync_and_and_fetch(&target, value); -} - -inline void AtomicDecrement(volatile u32& target) { - __sync_add_and_fetch(&target, -1); -} - -inline void AtomicIncrement(volatile u32& target) { - __sync_add_and_fetch(&target, 1); -} - -inline u32 AtomicLoad(volatile u32& src) { - return src; // 32-bit reads are always atomic. -} -inline u32 AtomicLoadAcquire(volatile u32& src) { - //keep the compiler from caching any memory references - u32 result = src; // 32-bit reads are always atomic. - //__sync_synchronize(); // TODO: May not be necessary. - // Compiler instruction only. x86 loads always have acquire semantics. - __asm__ __volatile__ ( "":::"memory" ); - return result; -} - -inline void AtomicOr(volatile u32& target, u32 value) { - __sync_or_and_fetch(&target, value); -} - -inline void AtomicStore(volatile u32& dest, u32 value) { - dest = value; // 32-bit writes are always atomic. -} -inline void AtomicStoreRelease(volatile u32& dest, u32 value) { - __sync_lock_test_and_set(&dest, value); // TODO: Wrong! This function is has acquire semantics. -} - -} - -// Old code kept here for reference in case we need the parts with __asm__ __volatile__. -#if 0 -LONG SyncInterlockedIncrement(LONG *Dest) -{ -#if defined(__GNUC__) && defined (__GNUC_MINOR__) && ((4 < __GNUC__) || (4 == __GNUC__ && 1 <= __GNUC_MINOR__)) - return __sync_add_and_fetch(Dest, 1); -#else - register int result; - __asm__ __volatile__("lock; xadd %0,%1" - : "=r" (result), "=m" (*Dest) - : "0" (1), "m" (*Dest) - : "memory"); - return result; -#endif -} - -LONG SyncInterlockedExchangeAdd(LONG *Dest, LONG Val) -{ -#if defined(__GNUC__) && defined (__GNUC_MINOR__) && ((4 < __GNUC__) || (4 == __GNUC__ && 1 <= __GNUC_MINOR__)) - return __sync_add_and_fetch(Dest, Val); -#else - register int result; - __asm__ __volatile__("lock; xadd %0,%1" - : "=r" (result), "=m" (*Dest) - : "0" (Val), "m" (*Dest) - : "memory"); - return result; -#endif -} - -LONG SyncInterlockedExchange(LONG *Dest, LONG Val) -{ -#if defined(__GNUC__) && defined (__GNUC_MINOR__) && ((4 < __GNUC__) || (4 == __GNUC__ && 1 <= __GNUC_MINOR__)) - return __sync_lock_test_and_set(Dest, Val); -#else - register int result; - __asm__ __volatile__("lock; xchg %0,%1" - : "=r" (result), "=m" (*Dest) - : "0" (Val), "m" (*Dest) - : "memory"); - return result; -#endif -} -#endif |