Drew Derbyshire wrote:
On 4/14/20 11:32 PM, Peter Coghlan wrote:
I wonder could this have been the COBOL compiler abusing MVCL instructions
in situations where they were not the appropriate instructions to use?
Perhaps instructions such as MVCL would be expected to be "hot spots" because
they can deliver a relatively large amount of work for a single instruction?
Or is it that implementations of this instruction were sometimes poorer than
they ought to be and they were really not delivering bang for buck?
I was told back in the 1980s that for performance reasons MUSIC moved
4096 bytes of data via a series of MVC commands in place of one MVCL.
Drew,
This is very interesting given our recent discussion on the matter.
(By the way, I replied to your recent "Inquiring minds" email but I fear you
may not have seen my reply as Google tends to route anything I send these days
into their recipients spam folder or otherwise quarantine it. Apparantly
Google regards me as a notorious source of spam or something for some time now.
I also sent emails to other Google mail users both on the this list not and
these also seem to have disappeared into black holes...)
Regards,
Peter Coghlan
--
Drew Derbyshire
"All right, Mr. DeMille, I'm ready for my close-up." -- "Sunset Blvd.,"
