汇编中的高级if语句

Question

How to write a logical operator if statement in Assembly? For example in C we have the AND and OR logical functions, let's say:

Written in C

if((A >= B) && ( C < D)) {
   A = A+1;
   C = C*C;
 }else
C = C - 1;
A = C;

I don't know if it's correct but in assembly i translate it in this way:

Translated in Assembly

if:   cmp RA,RB
      jl else
      cmp RC,RD
      jge else
      inc RA
      mul RC,RC
      jmp endif
else: dec RC
      mov RA,RC
endif:

I need your help, what if I have if((A >= B) || ( C < D))?, an OR function, which changes will be applied? I saw that assembly also has logical operators(AND, OR, XOR), is it possible to us them in this case? Could you describe an example of both cases?

Answer 1

what if I have if((A >= B) || ( C < D))

You can follow the same approach as your original code after applying De Morgan's law :

if(!((A < B) && ( C >= D)))

I saw that assembly also has logical operators(AND, OR, XOR), is it possible to us them in this case?

In this case, you could. However, it would no longer be equivalent to your C code, because || and && operators use short-circuit evaluation .