dynamic PIC register?

[David Edelsohn]

>>>>> dalej  writes:

Dale> On the Darwin powerpc target, it would be better not to have 
Dale> PIC_OFFSET_TABLE_REGNUM be a fixed register.  In particular, it should be 
Dale> a register saved over calls in a non-leaf function, and a register not 
Dale> saved over calls in a leaf function.  I could  do this by changing the 
Dale> fixed register at the last minute in the target-dependent prolog/epilog 
Dale> generation (which is what we did in the 2.95 version currently shipping).  
Dale> But it seems to me a cleaner solution that also applies to other targets 
Dale> might be useful.  Is this so, and how might I go about it?

	I thought that Geoff and/or Franz explored this for the 32-bit
PowerPC SVR4 GOT register and found this was not practical, but I don't
remember the details.  Maybe the impediment no longer exists.

David