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...and let's optimize a divisor of 2 ever so slightly for good measure. I wouldn't have bothered, but most GameCube games seem to hit this on launch. - Division by 2 Before: 41 BE 02 00 00 00 mov r14d,2 41 8B C2 mov eax,r10d 45 85 F6 test r14d,r14d 74 0D je overflow 3D 00 00 00 80 cmp eax,80000000h 75 0E jne normal_path 41 83 FE FF cmp r14d,0FFFFFFFFh 75 08 jne normal_path overflow: C1 F8 1F sar eax,1Fh 44 8B F0 mov r14d,eax EB 07 jmp done normal_path: 99 cdq 41 F7 FE idiv eax,r14d 44 8B F0 mov r14d,eax done: After: 45 8B F2 mov r14d,r10d 41 C1 EE 1F shr r14d,1Fh 45 03 F2 add r14d,r10d 41 D1 FE sar r14d,1