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C++性能榨汁机之循环展开 - I'm Root lee !
source link: http://irootlee.com/juicer_loop_unrolling/?
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什么是循环展开？ 循环展开，英文中称（Loop unwinding或loop unrolling），是一种牺牲程序的尺寸来加快程序的执行速度的优化方法。可以由程序员完成，也可由编译器自动优化完成。循环展开最常用来降低循环开销，为具有多个功能单元的处理器提供指令级并行。也有利于指令流水线的调度。循环展开对程序性能的影响 我们直接以实际代码向大家展示循环展开的作用，首先看未经过循环展开优化的代码
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