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c++ Programming Glossary: xchgreason why custom loop is faster? bad compiler? unsafe custom code? luck?(lucky cache hits) http://stackoverflow.com/questions/11529778/reason-why-custom-loop-is-faster-bad-compiler-unsafe-custom-code-lucklucky adds the triple XOR swap as well as one using the CPU's xchg instruction just because that's how I'd probably write it by.. 284 time to swap using add sub 308 time to swap using xchg 155 time to swap using triple xor 233 Source Note updated source.. do_it_again2 end of loop block mov a eax mov b ebx struct xchg void operator __asm mov ecx loops mov eax a mov ebx b do_it_again3..
Is Updating double operation atomic http://stackoverflow.com/questions/1292786/is-updating-double-operation-atomic boundary. All locked instructions the implicitly locked xchg instruction and other read modify write instructions with a..
Does 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 comfirm this for load MSVS2012 x86_64 using lock cmpxchg int val a.load std memory_order_acquire 000000013F931A1D prefetchw.. a 000000013F931A26 mov edx eax 000000013F931A28 lock cmpxchg dword ptr a edx 000000013F931A2E jne main 36h 013F931A26h std.. requires processor instructions on x86 x86_64 lock cmpxchg or only a simple load instruction mov as said Anthony Williams..
Why would fclose hang / deadlock? (Windows) http://stackoverflow.com/questions/6100598/why-would-fclose-hang-deadlock-windows we would see some atomic instructions eg. lock cmpxchg xchg etc. or calls to other synchronization functions. share.. we would see some atomic instructions eg. lock cmpxchg xchg etc. or calls to other synchronization functions. share improve..
C++ Memory Barriers for Atomics http://stackoverflow.com/questions/8841738/c-memory-barriers-for-atomics On x86 and x64 MemoryBarrier is implemented with a xchg and lock or respectively and I have seen some claims that this..
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