The semantics of Javascript require that all variables declared in a
function have the scope of the entire function. The compiler
implements this by allocating a register for every variable
declaration in a function on function entry. So, you can put your
`var`s wherever you like, the compiler has to emit the same code.
[I don't know how the Flash VM implements its registers, but my
educated guess is that VM registers are just slots in a stack so
there is no overhead to saving/restoring registers other than
adjusting the stack pointer.]
On 1 Dec 2005, at 20:59, Adam Wolff wrote:
If I have this:
function func1(){
var a, b;
a=1;
func2();
b=2;
return a+b;
}
Question for the compiler folks: I assume that a and b are register
variables. Is the compiler smart enough to know that I haven't
assigned a
value to b before the call to func2, so that its value does not
need to be
preserved on the stack when the call is made? If not, if I moved
the var b
declaration below the function call, would that help?
A
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