At 08:41 -0600 on 02/19/2014, Paul Gilmartin wrote about Re: assembler:
On Wed, 19 Feb 2014 12:51:33 +0000, DASDBILL2 wrote:
Since virtual storage is now so much less expensive and so much
more available than storage [1] was 50 years ago, why not be
really extravagant and use one whole byte per store? If the byte
contains 0, then the store number is not valid, or something like
that, and if the byte contains anything other than 0, then the
store number is valid. This should result in much simpler code to
access this table.
Locality of reference.
And Paging of the table. A one store per byte makes a much larger table.
[1] In those days, there was no virtual or real storage available
on IBM's mainframes. There was only "storage".
-- gil
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [email protected] with the message: INFO IBM-MAIN
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [email protected] with the message: INFO IBM-MAIN
