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; 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

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

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

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