new register allocator and HARD_REGNO_CALL_PART_CLOBBERED

[Dale Johannesen]

On Wednesday, May 14, 2003, at 05:05  AM, Michael Matz wrote:
> On Wed, 14 May 2003, Joern Rennecke wrote:
>
>>>  2) this set can change for each call, i.e. depends on the actual 
>>> call.
>>
>> It's not really the call that might be different, but if a different 
>> pseudo
>> is tracked across a different call, you have to consider the mode of 
>> that
>> other pseudo.
>
> Sure sure.  I just wanted to know if the set of forbidden regs could
> possibly also depend on the call in question.

I think some ports have this, for example there are a number of libcalls
in HPUX (IIRC) that use nonstandard calling conventions.  Don't know how
gcc deals with these (or if it does), or whether this can occur in
combination with HARD_REGNO_CALL_PART_CLOBBERED.