On 2013-10-24 09:35, David Cole wrote:
The reason that this useful is that this quirk can be exploited to
create, for example, a MAX or MIN function that is evaluated at
assembly time. (Maybe this has changed, but the last time I looked,
the Assembler did not offer native MAX and MIN
From: glen herrmannsfeldt g...@ugcs.caltech.edu
Sent: Thursday, October 24, 2013 4:22 PM
From C28-6514-5 on bitsavers, on page 16:
What manual is that; for what system, and what date?
Division by zero is permitted and yields a zero result.
After that, (and presumably also earlier) it has
Ask someone for a web browser and type google.com ;-) OS assembler
language; 360, and december 1967
Many moons ago, a friend (who went to math school) showed me his scars and
explained that it were evil that compilers could optimize in such a way
that an attempt to divide by zero would go
From: Rob van der Heij rvdh...@gmail.com
Sent: Thursday, October 24, 2013 9:35 PM
Ask someone for a web browser and type google.com ;-) OS assembler
language; 360, and december 1967
I have better things to do than do other people's research.
, October 24, 2013 5:35:32 AM
Subject: Re: Why is division by zero permitted?
Ask someone for a web browser and type google.com ;-) OS assembler
language; 360, and december 1967
Many moons ago, a friend (who went to math school) showed me his scars and
explained that it were evil
Robin,
What manual is that; for what system, and what date?
that was your question.
I have better things to do than do other people's research.
So you are not interested in any answer to your question I guess.
--
Martin
Pi_cap_CPU - all you ever need around MWLC/SCRT/CMT in z/VSE
more at
From: DASDBILL2 dasdbi...@comcast.net
Sent: Thursday, October 24, 2013 10:44 PM
The Assembler language book does not describe how processor instructions work.
Mine does. And most assembler langage books do also.
Processor instructions never have allowed division by zero.
Some early
Paul Gilmartin said HLASM (not S360). The standard divide instructions get S0C9
when dividing by 0. Is it floating point that allows divide by 0? Is it the
macro assembler SETA that allows it?
Jon Perryman.
- Original Message -
From: Rob van der Heij rvdh...@gmail.com
Ask someone
Let us stipulate that z/Architecture divide instructions, all of them,
throw exceptions when a zero divisor is detected.
That said, things then get more complicated. These exceptions cannot
be disabled using SPM. There is no program-mask bit available for for
doing so. They can, however, be
At 10/23/2013 08:30 PM, Paul Gilmartin wrote:
OK. Pure HLASM. I've long wondered why division by zero is permitted
in arithmetic expressions when otherwise overflows (even in division)
are reported as errors.
The only rationale I can think of (and a poor one) is that it was
initially
On 2013-10-24, at 04:35, Rob van der Heij wrote:
Ask someone for a web browser and type google.com ;-) OS assembler
language; 360, and december 1967
... which seems to take me to a bitsavers page, already discussed here.
Many moons ago, a friend (who went to math school) showed me his
24, 2013 00:22
To: ASSEMBLER-LIST@LISTSERV.UGA.EDU
Subject: Re: Why is division by zero permitted?
From C28-6514-5 on bitsavers, on page 16:
Division by zero is permitted and yields a zero result.
After that, (and presumably also earlier) it has to stay that way as code
(macros) might depend
On 2013-10-23 17:54, Kurt LeBesco wrote:
I've been reading quietly and wondering how the dialog drifted off to rexx
and pl1 land. Can we get back on topic? Thanks
OK. Pure HLASM. I've long wondered why division by zero is permitted
in arithmetic expressions when otherwise overflows (even
From: Paul Gilmartin paulgboul...@aim.com
Sent: Thursday, October 24, 2013 11:30 AM
OK. Pure HLASM. I've long wondered why division by zero is permitted
It is? According to my manual, the operation is suppressed,
and an exception occurs.
in arithmetic expressions when otherwise
permitted?
On 2013-10-23 17:54, Kurt LeBesco wrote:
I've been reading quietly and wondering how the dialog drifted off to
rexx and pl1 land. Can we get back on topic? Thanks
OK. Pure HLASM. I've long wondered why division by zero is permitted in
arithmetic expressions when otherwise overflows (even
What arithmetic expression allows divide by 0?
Jon Perryman.
From: Paul Gilmartin paulgboul...@aim.com
OK. Pure HLASM. I've long wondered why division by zero is permitted
in arithmetic expressions when otherwise overflows (even in division)
are reported
From C28-6514-5 on bitsavers, on page 16:
Division by zero is permitted and yields a zero result.
After that, (and presumably also earlier) it has to stay that
way as code (macros) might depend on that.
There is no reason given.
-- glen
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