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Memory ordering : ウィキペディア英語版
Memory ordering
Memory ordering describes the order of accesses to computer memory by a CPU. The term can refer either to the memory ordering generated by the compiler during compile time, or to the memory ordering generated by a CPU during runtime.
In modern microprocessors, memory ordering characterizes the CPUs ability to reorder memory operations - it is a type of out-of-order execution. Memory reordering can be used to fully utilize the bus-bandwidth of different types of memory such as caches and memory banks.
On most modern uniprocessors memory operations are not executed in the order specified by the program code. In single threaded programs all operations appear to have been executed in the order specified, with all out-of-order execution hidden to the programmer – however in multi-threaded environments (or when interfacing with other hardware via memory buses) this can lead to problems. To avoid problems memory barriers can be used in these cases.
== Compile-time memory ordering ==
The compiler has some freedom to resort the order of operations during compile time. However this can lead to problems if the order of memory accesses is of importance.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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