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Power-of-two divisors can be done more elegantly, so handle them separately. - Division by 4 Before: 41 BD 04 00 00 00 mov r13d,4 41 8B C0 mov eax,r8d 45 85 ED test r13d,r13d 74 0D je overflow 3D 00 00 00 80 cmp eax,80000000h 75 0E jne normal_path 41 83 FD FF cmp r13d,0FFFFFFFFh 75 08 jne normal_path overflow: C1 F8 1F sar eax,1Fh 44 8B E8 mov r13d,eax EB 07 jmp done normal_path: 99 cdq 41 F7 FD idiv eax,r13d 44 8B E8 mov r13d,eax done: After: 45 85 C0 test r8d,r8d 45 8D 68 03 lea r13d,[r8+3] 45 0F 49 E8 cmovns r13d,r8d 41 C1 FD 02 sar r13d,2