Paul,
I thing you are just 'digging your heels in' at this point and not
listening to what people are trying to tell you. I suggest you re-read
some of the responses with a more open mind.
Tony Thigpen
Paul Edwards wrote on 05/07/2018 09:51 AM:
On Mon, 7 May 2018 08:42:00 -0500, Joel C. Ewing <[email protected]> wrote:
From the early days of S/360 the high-order bit of a full-word address
pointer has a documented function in standard subroutine linkage of
indicating the last parameter address for subroutines that accept a
variable number of parameters, so even if the architecture might not
restrict using that bit for memory addressing, long-standing software
standards for AMODE24 and AMODE31 do.
Changing the documented conventions for using the high-order bit of a
32-bit address word
This convention *already* has to change for
anyone considering moving to AM64 and
using 64-bit pointers. There's no reason why
it should be mandatory for a full 64-bit
application, but disallowed for a 32-bit program.
Updating 32-bit programs to conform to
AM64 requirements is far less onerous
than the massive changes required to
create a 64-bit application.
to create a new "AMODE32" would potentially
adversely effect too many things for minimal benefit.
Nobody is affected, and the benefit of going from
a 2 GiB address space to a 4 GiB address space
is a great improvement.
BFN. Paul.
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