What to do with new-ra for GCC 4.0

[Daniel Berlin]

>    happen to replace or significantly rewrite reload[1].
>
> I disagree that one needs to do significant work to reload in order to get
> better register allocation.

You haven't actually disagreed with me.
Fact: Reload ends up replacing most of your spill code with more spill 
code anyway, as it currently stands.

You have simply stated that if the register allocator did more constraint 
handling, this would not happen.
I don't disagree with this.  In fact, i violently agree. However, the 
part you've missed is that as it stands, because of how the compiler is 
structured, this would require  moving a significant amount of reload to 
before register allocation.

Thus, you'd have to significantly rewrite reload into a pre-ra reload.

This is what pre-reload does on new-ra, but it ends up looking just like 
reload.