快速的寄存器内字节排序? [英] Fast in-register sort of bytes?

问题描述

鉴于一个4字节的寄存器(对于SIMD，则为16)，必须有一种有效的方法来用几条指令对寄存器中的字节进行排序.

Given a register of 4 bytes (or 16 for SIMD), there has to be an efficient way to sort the bytes in-register with a few instructions.

谢谢.

推荐答案

查找有效的分拣网络 N =您关心的字节数(4或16).将其转换为比较和交换指令序列. (不过，对于N = 16，这将大于几个".)

Look up an efficient sorting network for N = the number of bytes you care about (4 or 16). Convert that to a sequence of compare and exchange instructions. (For N=16 that'll be more than 'a few', though.)

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