assembly - Algorithm for assembly arithmetic

Question

Can someone check if my algorithm is correct

.data
    val1        BYTE        15h
    val2        WORD        8765h
    val3        DWORD   0FFFFh
    val4        WORD        7FFFh

Implement the following expression in assembly language: val3 = (-val4 + val3) – val2

movzx eax, val4
neg eax
add val3, eax
movzx ebx, val2
sub val3 ebx

Answer 1

如果假设您的 16 位变量仅包含非负值，则代码看起来是正确的。

但是，最后一条指令中缺少逗号。