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Re: "Using" statement? -

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Allodoxaphobia <knock_yourself_out@example.net> wrote:

> On Fri,  3 Aug 2012 13:05:13 +0000 (UTC), Anonymous wrote:
> > "Michel Castelein" <arcis@advalvas.be.without.this.no.spam.tail> wrote:
> >> "Fritz Wuehler" <fritz@spamexpire-201207.rodent.frell.theremailer.net> wrote: 
> >> > JEmebius <jemebius@xs4all.nl> wrote:
> >> >
> >> >> When I knew in advance that my OS/360 module would occupy more than 8 
> >> >> Kbytes (4096 bytes) and
> >> >> certainly less than 12 Kbytes I would define registers GR12, GR11 and 
> >> >> GR10 as base registers for the
> >> >> first 4K, the second 4K and the last 4K, and load them in advance with 
> >> >> the appropriate values:
> >> >> <GR15>, <GR15> + 4096, <GR15> + 8192.
> >> >
> >> > This is unnecessary and wasteful. There isn't any reason you need more 
> >> > than
> >> > one code base register, no matter how large the program is. Break the
> >> > program into functional routines, branch-enter those as needed, and 
> >> > readjust
> >> > the base register as needed to cover only the current routine.
> >> >
> >> >> (Takes 18 bytes)
> >> >
> >> > But wastes 2 registers for no good reason.
> >> 
> >> Yep. But using a sole base register with a "variable" contents does not 
> >> facilitate debugging.
> >
> > On the contrary, it is quite helpful for debugging because you always know
> > in which routine you are, when viewing a dump. This principle is widely
> > known, indeed the vendor dump analysis products all compute the failure
> > location by differencing all the GPRs from the next instruction address in
> > the PSW.
> 
> Provided the interrupt PSW is not the result of a WAB...

No, it still helps. Think about it. Now instead of wondering where in the
whole program you took the WAB you know it was most likely from the routine
based where the base register points.  

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"Using" statement? hancock4@bbs.cpcn.com - 2012-07-06 06:52 -0700
  Re: "Using" statement? John W Kennedy <jwkenne@attglobal.net> - 2012-07-06 11:24 -0400
    Re: "Using" statement? hancock4@bbs.cpcn.com - 2012-07-06 10:15 -0700
    Re: "Using" statement? Fritz Wuehler <fritz@spamexpire-201207.rodent.frell.theremailer.net> - 2012-07-12 07:31 +0200
      Re: "Using" statement? John W Kennedy <jwkenne@attglobal.net> - 2012-07-12 22:09 -0400
    Re: "Using" statement? Pete Nelson <plnelsonoma@yahoo.com> - 2012-07-12 08:36 -0700
      Re: "Using" statement? John W Kennedy <jwkenne@attglobal.net> - 2012-07-12 22:13 -0400
        Re: "Using" statement? Fritz Wuehler <fritz@spamexpire-201207.rodent.frell.theremailer.net> - 2012-07-13 14:12 +0200
          Re: "Using" statement? John W Kennedy <jwkenne@attglobal.net> - 2012-07-13 13:57 -0400
            Re: "Using" statement? Anonymous <noreply@breaka.net> - 2012-07-15 05:54 -0400
              Re: "Using" statement? -  JEmebius <jemebius@xs4all.nl> - 2012-07-30 22:09 +0100
                Re: "Using" statement? -- JEmebius <jemebius@xs4all.nl> - 2012-07-30 22:13 +0100
                Re: "Using" statement? --- JEmebius <jemebius@xs4all.nl> - 2012-07-30 22:19 +0100
                Re: "Using" statement? --- woodag@trap.ozemail.com.au (Andy Wood) - 2012-07-31 06:22 +0000
                Re: "Using" statement? --- reply JEmebius <jemebius@xs4all.nl> - 2012-08-01 02:44 +0100
                Re: "Using" statement? - Fritz Wuehler <fritz@spamexpire-201207.rodent.frell.theremailer.net> - 2012-07-31 20:46 +0200
                Re: "Using" statement? - reply JEmebius <jemebius@xs4all.nl> - 2012-08-01 03:10 +0100
                Re: "Using" statement? - reply Fritz Wuehler <fritz@spamexpire-201208.rodent.frell.theremailer.net> - 2012-08-07 16:36 +0200
                Re: "Using" statement? - reply Nomen Nescio <nobody@dizum.com> - 2012-08-07 21:33 +0200
                Re: "Using" statement? - reply Clark F Morris <cfmpublic@ns.sympatico.ca> - 2012-08-07 18:13 -0300
                Re: "Using" statement? - "Michel Castelein" <arcis@advalvas.be.without.this.no.spam.tail> - 2012-08-03 11:13 +0200
                Re: "Using" statement? - Anonymous <nobody@remailer.paranoici.org> - 2012-08-03 13:05 +0000
                Re: "Using" statement? - Allodoxaphobia <knock_yourself_out@example.net> - 2012-08-03 13:29 +0000
                Re: "Using" statement? - WAB JEmebius <jemebius@xs4all.nl> - 2012-08-04 00:03 +0100
                Re: "Using" statement? - WAB Allodoxaphobia <knock_yourself_out@example.net> - 2012-08-04 03:14 +0000
                Re: "Using" statement? - Nomen Nescio <nobody@dizum.com> - 2012-08-06 15:15 +0200
  Re: "Using" statement? alistair.j.l.maclean@gmail.com - 2012-08-19 05:58 -0700
    Re: "Using" statement? John W Kennedy <jwkenne@attglobal.net> - 2012-08-19 13:15 -0400
      Re: "Using" statement? Nomen Nescio <nobody@dizum.com> - 2012-08-19 22:20 +0200
        Re: "Using" statement? John W Kennedy <jwkenne@attglobal.net> - 2012-08-19 18:30 -0400

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