On 5/12/2018 2:02 PM, Ed Jaffe wrote:
On 5/6/2018 11:51 AM, Paul Edwards wrote:
Hi. I would like to submit an RFE to IBM to
Impossible.
Sorry. I misread your request.
I thought you were looking for -- in effect -- 32-bit addressing when
what you're really looking for is 64-bit addressing with storage
addresses that are guaranteed to fit into four bytes.
IMHO, your idea has merit. Doubling the size of storage pointers from
four bytes to eight bytes (as we have done on many occasions) can
require significant programming effort and can use a lot more
storage/cache. Assuming your code is already running in 64-bit mode, it
would be nice to be able to more than double the amount of storage you
can acquire without having to go through all of that hassle.
Of course, you might have to change numerous existing LLGT instructions
into LLGF instructions, but that's only a fraction of the effort needed
to widen all of your pointers.
Java uses USE2GTO32G=YES and USE2GTO64G=YES, but they LLGF/SLLG every
such pointer before using it for addressing. Implementing that technique
would require a lot of programming effort as well.
Your idea can be implemented nearly transparently. I like it...
--
Phoenix Software International
Edward E. Jaffe
831 Parkview Drive North
El Segundo, CA 90245
http://www.phoenixsoftware.com/
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