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Division by a power of two can be slightly improved when the destination and dividend registers are the same. Before: 8B C6 mov eax,esi 85 C0 test eax,eax 8D 70 03 lea esi,[rax+3] 0F 49 F0 cmovns esi,eax C1 FE 02 sar esi,2 After: 85 F6 test esi,esi 8D 46 03 lea eax,[rsi+3] 0F 48 F0 cmovs esi,eax C1 FE 02 sar esi,2