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A 32-bit vector can be viewed as containing 4 bytes (bits [31:24], [23:16], etc.). Build a circuit that will reverse the byte ordering of the 4-byte word. 一个32位向量可被视为包含4个字节（位[31:24]、[23:16]等）。构建一个电路，将4字节字的字节顺序反转。
AaaaaaaaBbbbbbbbCcccccccDddddddd => DdddddddCcccccccBbbbbbbbAaaaaaaa
This operation is often used when the endianness of a piece of data needs to be swapped, for example between little-endian x86 systems and the big-endian formats used in many Internet protocols. 当需要交换一段数据的字节序时，通常会使用此操作，例如在小端序的 x86 系统与许多互联网协议中使用的大端序格式之间进行转换。
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