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XOR 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: 44 89 F7 mov edi,r14d 81 F7 A0 52 57 01 xor edi,15752A0h After: BF A0 52 57 01 mov edi,15752A0h 41 33 FE xor edi,r14d