On 1/22/2014 12:57 AM, Itschak Mugzach wrote:
64 bit addressing execution is faster if less access to real memory is
required to fetch the next instruction. This is what quadword promise,
is'It? the "performance gain" is also depend on the logic of the program
(if commands sequenced well with less brunch instructions).
ITschak
Yes, I can see where brunch would slow things down. Almost makes
one sleepy now ... :-)
-Steve
On Wed, Jan 22, 2014 at 5:30 AM, Jim Mulder <d10j...@us.ibm.com> wrote:
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)
CDSG was implemented in millicode on the z900, z800, z990, z890,
and z9 machines. It was moved to hardware on the z10 and later
machines.
Jim Mulder z/OS System Test IBM Corp. Poughkeepsie, NY
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