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OR allows for a more compact representation for constants that can be represented by a signed 8-bit integer, while MOV does not. By letting MOV handle the larger constants we can occasionally save a byte. Before: 45 8B F5 mov r14d,r13d 41 81 CE 00 80 01 00 or r14d,18000h After: 41 BE 00 80 01 00 mov r14d,18000h 45 0B F5 or r14d,r13d