Regression due to tree loop opt / expand weirdness

[Ulrich Weigand]

Richard Kenner wrote:
> 
>     First of all, the above change is provably a no-op on ia64 since
>     the valid_pointer_mode implementation on ia64 is the default one,
>     which is exactly (mode != Pmode && mode != ptr_mode).
> 
> Please read what I wrote.  On some ia64 systems (e.g., VMS), Pmode and
> ptr_mode are both DImode but you need to support 32-bit pointers.  On
> those ia64 systems, target.valid_pointer_mode is overridden to allow both
> SImode and DImode.

I could not find any such ia64 system in current GCC CVS, are you talking
about an out-of-tree port?

In any case, as I said, s390x/TPF is in exactly this situation (Pmode ==
ptr_mode == DImode, valid_pointer_mode overridden to allow both SImode
and DImode); and this case is exactly the one that my patch fixes.

Bye,
Ulrich

-- 
  Dr. Ulrich Weigand
  weigand@informatik.uni-erlangen.de