If you are wanting to run in AM64 and use 32 bit constants, that is
certainly possible.  You will then be limited to incrementing
registers by 4GiB or less.  Just establishing addressability will need
to set all 64 bits.

On Thu, Apr 4, 2019 at 2:40 PM Paul Edwards <mutazi...@gmail.com> wrote:
>
> On Thu, 4 Apr 2019 19:32:01 +0000, Martin Packer <martin_pac...@uk.ibm.com> 
> wrote:
>
> >They will be (running 64-bit). However, apart from Db2*, much of their
> >virtual storage components can't tolerate being above the bar.
>
> Which virtual storage components can't tolerate
> being above the bar, and why is that and what
> would need to change?
>
> Thanks. Paul.
>
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-- 
Mike A Schwab, Springfield IL USA
Where do Forest Rangers go to get away from it all?

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