int get_c_from_a (int a)
{
	struct s tmp;
	tmp = get_some_values(a);
	return tmp.c;
}

======

get_c_from_a:

; prolog - setup the local frame
push ebp
mov ebp, esp

sub esp, 0xc   ; make room on the stack for tmp (3 * 4-byte ints)

mov eax, [ebp+8]  ; eax = arg1 to get_c_from_a = a
push eax          ; pushing it as arg1 to get_some_values

lea eax, [ebp-0xc] ; eax = &tmp
push eax           ; push &tmp (we only push a return value pointer for complex return objects)

call get_some_values

; our struct now looks like
; [ebp-c]:  tmp.a = a + 1
; [ebp-8]:  tmp.b = a + 2
; [ebp-4]:  tmp.c = a + 3

; and we want to return tmp.c in eax
mov eax, [ebp-4]

; epilog - restores esp and ebp to their entry values, cleaning up our stack usage
mov esp, ebp
pop ebp
ret