SSA usage question

[Richard Henderson]

On Sun, Jun 06, 2004 at 07:05:42PM -0400, Richard Kenner wrote:
>     What we will NOT do is have implicit variable references.
>     Of any kind.  This is not open to discussion.
> 
> Of course it's open for discussion!

Implicit references cannot be put into SSA form, and thus cannot
be put through the tree optimizer at all.  QED.

> It's simply not an acceptable approach to throw away all typing, aliasing and
> array structure implementation just because there's a variable size, lower
> bound, or position involved.

That's what rtl did.  I don't see that we're really doing anything
different.  Yes, we could do *better* if we figured out *some other*
representation that preserved information longer, but I really don't
believe we'll do significantly worse in the mean time.


r~