On 6/14/2018 5:44 PM, Robin Vowels wrote:
----- Original Message ----- From: "Ed Jaffe"
<[email protected]>
Sent: Friday, June 15, 2018 5:34 AM
BY FAR the fastest way HANDS DOWN -- if you're looking for 16 or
fewer characters -- is with the vector instructions...
How many words can you fit into 16 characters?
Haha! I assume that's a joke, but this is no laughing matter. SIMD is a
"game changer" for this platform.
We use it in (E)JES for general searching of any string (the FIND
command) within (for example) spooled reports. We use VFAEB to locate
the first character of the search string. (This use case uses requires
only one of the 16 possible search characters.) Once it's located, we
then CLC on the remaining characters to see if we've found a match --
just the same as we would if we were using TRT or SRST. This technique
runs *CIRCLES* around SRST, TRT, and -- of course -- straight CLC.
Nothing else we've tried even comes close...
We also use vector instructions for bit map searches, parsing of 3270
messages (looking for up to 16 different orders), and numerous other
primitives throughout our infrastructure.
--
Phoenix Software International
Edward E. Jaffe
831 Parkview Drive North
El Segundo, CA 90245
http://www.phoenixsoftware.com/
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