; Assuming condition result is in a flag
mov eax, i
lea edx, [rax + 1]    ; edx = i + 1
cmovnz eax, edx       ; if condition != 0, eax = edx
mov i, eax

##</code><code>##

lea edx, [i + 1]
test condition, condition
cmovnz i, edx         ; conditionally move the incremented value

##</code><code>##

xor eax, eax
test condition, condition
setnz al              ; al = (condition != 0) ? 1 : 0
add i, eax            ; i += 0 or 1

##</code><code>##

; If your condition sets the carry flag:
adc i, 0              ; i += carry flag