RE: 64-bit

[Buck Calabro <Buck.Calabro@xxxxxxxxxxxx>]

In the spirit of the "hardware is willing but the software is weak," the
V5R1 CRTPGM has a parameter for STGMDL that allows traditional *SNGLVL (the
default) or the new *TERASPACE model.  CRTSRVPGM gets an additional option:
*INHERIT.  Be aware that using the teraspace model entails a new variety of
activation group that can't readily mix with a single level storage
activation group.

See the Ile Concepts V5R1 manual chapter 4 for the complications that arise
trying to use teraspace.

I think that teraspace is trying to emulate one of the many C memory models
by limiting pointers to 8 bytes instead of the single store's 16 bytes.

The ILE Concepts mumbles something about Effective Address Overflows, where
address calculation on a 16 byte pointer crosses a 16MB boundary.  Must have
been an interesting architectural discussion trading off segment size vs.
performance on those slow S/38's.

  --buck

"Thousands of geniuses live and die undiscovered --
 either by themselves or by others." -Mark Twain