On 2014-01-21 15:42, John Gilmore wrote:
This thread has been curiously silent about one characteristic of
routines/instructions executed above the bar. Unsurprisingly, they
are measurably faster than their analogues executed below it.
z/Architecture is 64-bit architecture
One caveat to that statement is as follows, from the POps:
"The performance of CDSG on some models may
be significantly slower than that of CSG. WHEN
QUADWORD CONSISTENCY IS NOT REQUIRED BY THE PROGRAM,
alternate code sequences should be used."
(my caps)
There are situations where serializing updates to data areas in 64-bit
storage do require quadword consistency, while the same algorithm using
31-bit storage would only require doubleword consistency.
Having said that, the OP did not mention any need to update his tables.
--
Regards, Gord Tomlin
Action Software International
(a division of Mazda Computer Corporation)
Tel: (905) 470-7113, Fax: (905) 470-6507
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