John Dravnieks wrote:
Ed
One small correction - the long displacement instructions were retrofitted
to the z900 machines so they are available on all z/Architecture machines.
The caveat is that on the z900/z800 machines, the performance of these
instructions is SLOW.
John, Thanks for clarifying that point!
I have been aware of the millicode implementation of the long
displacement instructions since they were first retrofitted to
z800/z900, but I don't take them seriously. That retrofit occurred just
so the DB2 V8 developers could code/test with those instructions on
pre-T-Rex hardware. I doubt any serious software developer would
actually want to make heavy use of them knowing how slowly they execute
on z800/z900. Nevertheless, I should have made that point clear...
--
Edward E Jaffe
Phoenix Software International, Inc
5200 W Century Blvd, Suite 800
Los Angeles, CA 90045
310-338-0400 x318
[EMAIL PROTECTED]
http://www.phoenixsoftware.com/
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