Andrew Pinski writes:
>
> On Jun 20, 2006, at 7:20 AM, Andrew Haley wrote:
>
> > Does using fields of auto variables of union type generate code that
> > is less efficient than it would be using scalars?
>
> If it is only one used field at a time (and the address is not taken),
> then FRE will resolve them.
>
> Take:
> int f(int t, int t1)
> {
>
> union f
> {
> int n;
> float n1;
> } f1, f2;
> f1.n = t;
> f2.n1 = t1;
> int t2 = f1.n;
> f1.n1 = t2;
> return f1.n1 + f2.n1 * f1.n1;
> }
>
> in final_cleanup, we get:
> D.1522 = (float) t;
> return (int) (D.1522 + (float) t1 * D.1522);
OK, thanks.
Andrew.
