Sometimes, you can get by with a simple verification point, but sometimes you need conditionals, and sometimes you need to add a delay or a loop.
有时,您需要一个简单的验证点,但是有时您需要条件语句,还有时您需要添加一个延迟或者循环。
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For example, a compiler may choose to optimize a loop index variable by storing it in a register, or the cache may delay flushing a new value of a variable to main memory until a more opportune time.