For Pete's sake, Tom was poking the bear for our amusement. And it's amusing to see who is willing to get back to beating on this old dead horse.
sas On Tue, Aug 8, 2023 at 8:31 AM Seymour J Metz <sme...@gmu.edu> 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. > > > > > > ---------------------------------------------------------------------- > > > For IBM-MAIN subscribe / signoff / archive access instructions, > > > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > > > > > > > > > > > > > > > ---------------------------------------------------------------------- > > > For IBM-MAIN subscribe / signoff / archive access instructions, > > > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > > > > > > > > > > ---------------------------------------------------------------------- > > For IBM-MAIN subscribe / signoff / archive access instructions, > > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > > > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
