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When destination and input registers match, a redundant MOV instruction can be eliminated. Before: 8B C7 mov eax,edi 8B F8 mov edi,eax C1 EF 1F shr edi,1Fh 03 F8 add edi,eax D1 FF sar edi,1 After: 8B C7 mov eax,edi C1 EF 1F shr edi,1Fh 03 F8 add edi,eax D1 FF sar edi,1