Moves the active stack frame up.

上移活动堆栈帧。

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Moves the active stack frame down.

下移活动堆栈帧。

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Also, the constant reuse of stack regions tends to keep active stack memory in the CPU caches, speeding up access.

另外，栈的反复使用能够使栈驻留在cpu缓存(cpu caches)中，从而加快数据存取。

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