It was a joke to help get us off the Truck topic.
It didn't work.

On 8/8/2023 5:30 AM, Seymour J Metz wrote:
Well, SLR, SR and XR have less of a I-cache hit then the others. What about, 
e.g., SGR, SLGR, XFR?


--
Shmuel (Seymour J.) Metz
http://mason.gmu.edu/~smetz3

________________________________________
From: IBM Mainframe Discussion List [IBM-MAIN@LISTSERV.UA.EDU] on behalf of 
Attila Fogarasi [fogar...@gmail.com]
Sent: Monday, August 7, 2023 8:19 PM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: What's the fastest way to clear a register? Was: Trucks and 
Politics

Starting with zEC12 the 4 common ways to clear a register are identical
speed: LHI/LGHI, XR, SR, SLR.  On earlier models it varied due to
differences in pipeline implementation and going way back, to limitations
in microcode.  For current machines there is a lot of capability for
implementing optimization context, so it isn't so much single instructions
being optimized but the outcome of a sequence.  Clearing a register is
recognized as a trivial special case (IBM has the patent).

On Tue, Aug 8, 2023 at 10:03 AM Tom Brennan <t...@tombrennansoftware.com>
wrote:

So what's the fastest way to clear a register?

Maybe that will get things back to mainframes, and I even know what a
mainframe is.

On 8/7/2023 4:42 PM, Bill Johnson wrote:
America should never allow trucks as large as we do. Should also not
permit doubles and even triples and all trucks should have a lower speed
limit. But we all know lives aren’t nearly as important as profits for
trucking companies. America also had an opportunity to limit the size of
regular vehicles and fossil fuels usage but failed miserably because
Americans are self centered, piggish, and environmental denialists.


Sent from Yahoo Mail for iPhone


On Monday, August 7, 2023, 7:32 PM, Bob Bridges <robhbrid...@gmail.com>
wrote:

This is off-topic, and I'll happily take it up with both Bill and Shmuel
offline if requested.  But I may as well point out that "fewer deaths" may
not be as simple as they're assuming.  It seems likely to me as well that
if we had smaller trucks going slower, fewer people would die in accidents
caused by bigger trucks going faster.  But how many people would die
because of smaller trucks going slower?  You gotta compare deaths to
deaths, not simply deaths to nothing.

Why would people die from smaller trucks going slower?  Well, a good
deal less cargo would be transported as a result, and I surmise (but it's
only surmise) that there'd be a lot more pressure on drivers, as a result,
to produce more.  Some of that pressure would translate to tired drivers.
And all of it would translate to more expensive transportation, meaning
that poorer people would have increased difficulty affording the goods that
are cheaper now.

Don't assume I'm saying that it's better as we do things now.  I'm not;
I'm just saying that "this cause of death would be reduced" is no help
unless you can estimate how many deaths would also increase.  And if anyone
thinks there'd be NO deaths owing to more expensive goods, I'll just shut
up.

---
Bob Bridges, robhbrid...@gmail.com, cell 336 382-7313

/* A good scare is worth more than good advice.  -Horace (65 BC – 8 BC)
*/

-----Original Message-----
From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On
Behalf Of Bill Johnson
Sent: Monday, August 7, 2023 18:45

For Americans here who’ve never been to Europe, trucks in Europe are
much smaller than US trucks, are required to have governors to limit their
speed, and are restricted to the right lane. The result is far fewer
traffic deaths involving trucks.

In addition, Europeans almost never drive pickups and their automobiles
are much smaller.

Their rates of deaths and serious injury are far less than America.

So for you pro life people, perhaps some road restrictions would keep
more people alive.

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