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c++ Programming Glossary: a.storeDoes the semantics of `std::memory_order_acquire` requires processor instructions on x86/x86_64? http://stackoverflow.com/questions/18576986/does-the-semantics-of-stdmemory-order-acquire-requires-processor-instruction confirms this for store MSVS2012 x86_64 std atomic int a a.store 0 std memory_order_relaxed 000000013F931A0D mov dword ptr a.. memory_order_relaxed 000000013F931A0D mov dword ptr a 0 a.store 1 std memory_order_release 000000013F931A15 mov dword ptr a.. mov 0x30 rsp edx Disassembler GCC 4.8.1 x86_64 GDB store a.store temp std memory_order_relaxed a.store temp std memory_order_release..
Why GCC does not use LOAD(without fence) and STORE+SFENCE for std::memory_order_seq_cst? http://stackoverflow.com/questions/19047327/why-gcc-does-not-use-loadwithout-fence-and-storesfence-for-stdmemory-order without fence and STORE MFENCE std atomic int a int temp 0 a.store temp std memory_order_seq_cst 0x4613e8 0x0058 mov 0x38 rsp eax.. int a char b 64 void seq movl 0 a rip mfence int temp 0 a.store temp std memory_order_seq_cst void rel movl 0 a rip int temp.. std memory_order_seq_cst void rel movl 0 a rip int temp 0 a.store temp std memory_order_relaxed With respect to the atomic variable..
Memory model ordering and visibility? http://stackoverflow.com/questions/7461484/memory-model-ordering-and-visibility by atomic_thread_fence memory_order_acquire . Similarly a.store x memory_order_release is equivalent to a call to atomic_thread_fence.. atomic_thread_fence memory_order_release before a call to a.store x memory_order_relaxed . memory_order_consume is a special case.. example it would act as a release fence for a subsequent a.store x memory_order_relaxed . 3 Fences and atomic operations do not..
How to use std::atomic efficiently http://stackoverflow.com/questions/8749038/how-to-use-stdatomic-efficiently unsigned variable a a.load std memory_order_acquire and a.store new_value std memory_order_release are no more expensive than..
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