Serious performance regression -- some tree optimizer questions

[Mircea Namolaru]

>> IBM Haifa has some patches waiting for GCC 4.1 to address sign
>> extension problems.
>
> Zdenek's latest patch addressed all sign-extension problems
> I've been seeing with my test case -- are the Haifa patches
> concerned with the same issues or different ones?

Regarding our intended patch you can look at:

- The overview of the algorithm:
http://gcc.gnu.org/ml/gcc/2004-06/msg00472.html

- The RFC for the implementation:
http://gcc.gnu.org/ml/gcc/2004-09/msg00377.html

Mircea