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Logical And

SWF Action
Action Category: 
Logical and Bitwise
Action Details: 
0
Action Identifier: 
16
Action Structure: 
<n.a.>
Action Length: 
0 byte(s)
Action Stack: 
pop 2 (b), push 1 (b)
Action Operation: 
b1 := pop();
b2 := pop();
r := b2 && b1;
push(r);
Action Flash Version: 
4

Pop two values, compute the Logical AND and put the Boolean result back on the stack.

b1 b2 Result
false false false
true false false
false true false
true true true
Logical AND table

IMPORTANT NOTE

If b2 is the result of a function call and b1 is false, then that function should not be called. With this action, however, b1 and b2 are just Boolean values on the stack. So to properly implement a Logical AND in your compiler you want to do something like this:

call f1       // b1 does not need to come from a function call
duplicate
logical not
branch if true, skip
call f2
logical and   // we could also pop just before calling f2
label skip:

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