通常这些指令称为循环开销（Loop Overhead）。在ARM7或ARM9处理器上，加法指令需要1个周期，条件分支指令需要3个周期，这样每个循环就需要4个周期的开销。
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zero overhead loop 零耗循环 ; 零开销循环
Code that spends most of its time making library calls is just not going to benefit that much from Pyrex speeding up incidental loop overhead.
花费大部分时间在库函数调用上的代码不会像那些简单循环任务一样使用Pyrex可以获得明显的加速。
Code generated for Silicon Labs single-cell C80519XXF by a non-OCG compiler results in an average of 108 cycles to execute the interrupt service routine and main loop overhead for each sample of data.
非ocg编译器针对Silicon Labs单电池供电c 80519 XXF所产生的代码，每次数据采样平均会有108个周期来执行中断服务程序和主循环。
This saves time by reducing the number of overhead instructions that the computer has to execute in a loop.
通过减少循环中计算机需要执行的指令，节省了执行时间。
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