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Re: PA specifies invalid T_ADAFLAGS


In message <10204251034.AA10713@vlsi1.ultra.nyu.edu>, Richard Kenner writes:
 > Again, the -mdisable-indexing was not working around a *bug* but a 
 > fundamental problem in the PA architecture preventing virtual origins
 > from working if they are used.
 > 
 > Unless *all 8* SR's are set to consecutive memory segments, it isn't safe
 > to use the indexing forms.
More correctly, sr4-sr7 need to be set to the _same_ memory segment.

Some systems do this (Utah's BSD & OSF ports for example) and there were
some PAs without space registers (level 0 implementations, not to be confused
with PA1.0).

On systems where sr4-sr4 hit the same segment or on level 0 implementations
indexing can be done without considering the implicit space register selection
problems.


jeff


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