Some data movement instructions re?order the sequence of bits that comprise the data elements they are moving. Why?
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Sometimes data is packed; that is, several variables are stored in a single 32?bit value. If you can change the order of the bytes when you move data, you can make the information easier to access. Sometimes there are endian problems (e.g., in the interface between different types of processor with different endian conventions; that is, big vs. small). Changing the bytes order as words are moved can be helpful. The 68K uses byte rearranging to deal with 8?bit peripherals that are connected to a 16?bit data bus (that is, only odd or even bytes are accessed).
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