Implementing a flow “(1) if {…} else if {…} … (2)” in Assembly

Question

I have the following flow in C:

// some stuff1
//................


if (something1) {
    func1();
    func2();
} else if (something2) {
    func3();
    func4()         


        

Answer 1

I would say that it largely depends on how much code you have in these {...} blocks.
If there's limited code in them use:

    cmp  [some_struc], SOME_CONST
    jne  Else
    {...}
    jmp  EndIf
Else:
    cmp  [some_struc], SOME_CONST2
    jne  EndIf
    {...}
EndIf:
    cmp  rax, 0

If there's more code:

    cmp  [some_struc], SOME_CONST
    jne  Else
    call Part1
    jmp  EndIf
Else:
    cmp  [some_struc], SOME_CONST2
    jne  EndIf
    call Part2
EndIf:
    cmp  rax, 0

Part1:
    {...}
    ret
Part2:
    {...}
    ret

Best use call. I would not advice to jump to Part1 or Part2 and then jump back to EndIf.
This creates spaghetti code. Less readable and quickly becomes less maintainable.