diff options
Diffstat (limited to 'js/src/jit/mips-shared/AtomicOperations-mips-shared.h')
| -rw-r--r-- | js/src/jit/mips-shared/AtomicOperations-mips-shared.h | 76 |
1 files changed, 0 insertions, 76 deletions
diff --git a/js/src/jit/mips-shared/AtomicOperations-mips-shared.h b/js/src/jit/mips-shared/AtomicOperations-mips-shared.h index dee9302300..7441a27e87 100644 --- a/js/src/jit/mips-shared/AtomicOperations-mips-shared.h +++ b/js/src/jit/mips-shared/AtomicOperations-mips-shared.h @@ -13,22 +13,9 @@ #if defined(__clang__) || defined(__GNUC__) -// The default implementation tactic for gcc/clang is to use the newer -// __atomic intrinsics added for use in C++11 <atomic>. Where that -// isn't available, we use GCC's older __sync functions instead. -// -// ATOMICS_IMPLEMENTED_WITH_SYNC_INTRINSICS is kept as a backward -// compatible option for older compilers: enable this to use GCC's old -// __sync functions instead of the newer __atomic functions. This -// will be required for GCC 4.6.x and earlier, and probably for Clang -// 3.1, should we need to use those versions. - -//#define ATOMICS_IMPLEMENTED_WITH_SYNC_INTRINSICS - inline bool js::jit::AtomicOperations::isLockfree8() { -# ifndef ATOMICS_IMPLEMENTED_WITH_SYNC_INTRINSICS MOZ_ASSERT(__atomic_always_lock_free(sizeof(int8_t), 0)); MOZ_ASSERT(__atomic_always_lock_free(sizeof(int16_t), 0)); MOZ_ASSERT(__atomic_always_lock_free(sizeof(int32_t), 0)); @@ -36,19 +23,12 @@ js::jit::AtomicOperations::isLockfree8() MOZ_ASSERT(__atomic_always_lock_free(sizeof(int64_t), 0)); # endif return true; -# else - return false; -# endif } inline void js::jit::AtomicOperations::fenceSeqCst() { -# ifdef ATOMICS_IMPLEMENTED_WITH_SYNC_INTRINSICS - __sync_synchronize(); -# else __atomic_thread_fence(__ATOMIC_SEQ_CST); -# endif } template<typename T> @@ -56,14 +36,8 @@ inline T js::jit::AtomicOperations::loadSeqCst(T* addr) { MOZ_ASSERT(sizeof(T) < 8 || isLockfree8()); -# ifdef ATOMICS_IMPLEMENTED_WITH_SYNC_INTRINSICS - __sync_synchronize(); - T v = *addr; - __sync_synchronize(); -# else T v; __atomic_load(addr, &v, __ATOMIC_SEQ_CST); -# endif return v; } @@ -72,13 +46,7 @@ inline void js::jit::AtomicOperations::storeSeqCst(T* addr, T val) { MOZ_ASSERT(sizeof(T) < 8 || isLockfree8()); -# ifdef ATOMICS_IMPLEMENTED_WITH_SYNC_INTRINSICS - __sync_synchronize(); - *addr = val; - __sync_synchronize(); -# else __atomic_store(addr, &val, __ATOMIC_SEQ_CST); -# endif } template<typename T> @@ -86,12 +54,8 @@ inline T js::jit::AtomicOperations::compareExchangeSeqCst(T* addr, T oldval, T newval) { MOZ_ASSERT(sizeof(T) < 8 || isLockfree8()); -# ifdef ATOMICS_IMPLEMENTED_WITH_SYNC_INTRINSICS - return __sync_val_compare_and_swap(addr, oldval, newval); -# else __atomic_compare_exchange(addr, &oldval, &newval, false, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST); return oldval; -# endif } template<typename T> @@ -99,11 +63,7 @@ inline T js::jit::AtomicOperations::fetchAddSeqCst(T* addr, T val) { static_assert(sizeof(T) <= 4, "not available for 8-byte values yet"); -# ifdef ATOMICS_IMPLEMENTED_WITH_SYNC_INTRINSICS - return __sync_fetch_and_add(addr, val); -# else return __atomic_fetch_add(addr, val, __ATOMIC_SEQ_CST); -# endif } template<typename T> @@ -111,11 +71,7 @@ inline T js::jit::AtomicOperations::fetchSubSeqCst(T* addr, T val) { static_assert(sizeof(T) <= 4, "not available for 8-byte values yet"); -# ifdef ATOMICS_IMPLEMENTED_WITH_SYNC_INTRINSICS - return __sync_fetch_and_sub(addr, val); -# else return __atomic_fetch_sub(addr, val, __ATOMIC_SEQ_CST); -# endif } template<typename T> @@ -123,11 +79,7 @@ inline T js::jit::AtomicOperations::fetchAndSeqCst(T* addr, T val) { static_assert(sizeof(T) <= 4, "not available for 8-byte values yet"); -# ifdef ATOMICS_IMPLEMENTED_WITH_SYNC_INTRINSICS - return __sync_fetch_and_and(addr, val); -# else return __atomic_fetch_and(addr, val, __ATOMIC_SEQ_CST); -# endif } template<typename T> @@ -135,11 +87,7 @@ inline T js::jit::AtomicOperations::fetchOrSeqCst(T* addr, T val) { static_assert(sizeof(T) <= 4, "not available for 8-byte values yet"); -# ifdef ATOMICS_IMPLEMENTED_WITH_SYNC_INTRINSICS - return __sync_fetch_and_or(addr, val); -# else return __atomic_fetch_or(addr, val, __ATOMIC_SEQ_CST); -# endif } template<typename T> @@ -147,11 +95,7 @@ inline T js::jit::AtomicOperations::fetchXorSeqCst(T* addr, T val) { static_assert(sizeof(T) <= 4, "not available for 8-byte values yet"); -# ifdef ATOMICS_IMPLEMENTED_WITH_SYNC_INTRINSICS - return __sync_fetch_and_xor(addr, val); -# else return __atomic_fetch_xor(addr, val, __ATOMIC_SEQ_CST); -# endif } template<typename T> @@ -185,35 +129,21 @@ inline T js::jit::AtomicOperations::exchangeSeqCst(T* addr, T val) { MOZ_ASSERT(sizeof(T) < 8 || isLockfree8()); -# ifdef ATOMICS_IMPLEMENTED_WITH_SYNC_INTRINSICS - T v; - __sync_synchronize(); - do { - v = *addr; - } while (__sync_val_compare_and_swap(addr, v, val) != v); - return v; -# else T v; __atomic_exchange(addr, &val, &v, __ATOMIC_SEQ_CST); return v; -# endif } template<size_t nbytes> inline void js::jit::RegionLock::acquire(void* addr) { -# ifdef ATOMICS_IMPLEMENTED_WITH_SYNC_INTRINSICS - while (!__sync_bool_compare_and_swap(&spinlock, 0, 1)) - ; -# else uint32_t zero = 0; uint32_t one = 1; while (!__atomic_compare_exchange(&spinlock, &zero, &one, false, __ATOMIC_ACQUIRE, __ATOMIC_ACQUIRE)) { zero = 0; continue; } -# endif } template<size_t nbytes> @@ -221,16 +151,10 @@ inline void js::jit::RegionLock::release(void* addr) { MOZ_ASSERT(AtomicOperations::loadSeqCst(&spinlock) == 1, "releasing unlocked region lock"); -# ifdef ATOMICS_IMPLEMENTED_WITH_SYNC_INTRINSICS - __sync_sub_and_fetch(&spinlock, 1); -# else uint32_t zero = 0; __atomic_store(&spinlock, &zero, __ATOMIC_SEQ_CST); -# endif } -# undef ATOMICS_IMPLEMENTED_WITH_SYNC_INTRINSICS - #elif defined(ENABLE_SHARED_ARRAY_BUFFER) # error "Either disable JS shared memory at compile time, use GCC or Clang, or add code here" |