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Groups > comp.compilers > #1312
| From | glen herrmannsfeldt <gah@ugcs.caltech.edu> |
|---|---|
| Newsgroups | comp.compilers |
| Subject | Re: Algol history, was specifying semantics |
| Date | 2014-07-07 19:49 +0000 |
| Organization | Aioe.org NNTP Server |
| Message-ID | <14-07-022@comp.compilers> (permalink) |
| References | (7 earlier) <14-07-001@comp.compilers> <14-07-005@comp.compilers> <14-07-015@comp.compilers> <14-07-018@comp.compilers> <14-07-019@comp.compilers> |
Ivan Godard <ivan@ootbcomp.com> wrote:
>> [As far as I know, the machine readable source was lost.
>> Even with a copy of the source, you'll need a copy of PL360, the
>> Algol-flavored assembler it was written in. -John]
> IMO, PL360 was the best language work that Wirth ever did.
(snip)
> The key idea was the absence of operator precedence; expressions were
> executed in strict left-to-right order, with operations for each machine
> op and explicit register names for operands:
> r5 := r3 + r2 * r1; (PL360)
> The target register served as the accumulator for the expression.
It gets even more interesting, as I remember it, if the left side
register is also on the right. Consider:
r1:= r1 + r1 + r1;
which, in effect, multiplies r1 by four. As you note, r1 is the
accumulator for the expression, and also changes as it is being
evaluated:
LR R1,R1
AR R1,R1
AR R1,R1
Remembering from 40 years ago, I believe that one is in the manual.
-- glen
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Formatting of Language LRMs Seima Rao <seimarao@gmail.com> - 2014-06-17 16:54 +0530
Re: Formatting of Language LRMs "lpsantil@gmail.com" <lpsantil@gmail.com> - 2014-06-20 10:10 -0700
Re: Formatting of Language LRMs glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2014-08-03 04:37 +0000
Re: Formatting of Language LRMs Ivan Godard <ivan@ootbcomp.com> - 2014-06-20 12:09 -0700
Re: Formatting of Language LRMs glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2014-06-21 02:27 +0000
Re: Formatting of Language LRMs Kaz Kylheku <kaz@kylheku.com> - 2014-06-21 03:09 +0000
Re: Formatting of Language LRMs Joshua Cranmer 🐧 <Pidgeot18@verizon.net.invalid> - 2014-06-22 21:12 -0500
Re: VWG and K, was Formatting of Language LRMs Ivan Godard <ivan@ootbcomp.com> - 2014-06-22 21:47 -0700
RE: Formatting of Language LRMs "Costello, Roger L." <costello@mitre.org> - 2014-07-03 09:06 +0000
Re: Formatting of Language LRMs Ivan Godard <ivan@ootbcomp.com> - 2014-07-03 22:30 -0700
Re: syntax checkers, was Formatting of Language LRMs glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2014-07-04 17:35 +0000
Re: executable semantics, was Formatting of Language LRMs wclodius@earthlink.net (William Clodius) - 2014-07-04 15:53 -0600
Re: specifying semantics, was Formatting of Language LRMs seimarao@gmail.com - 2014-06-24 02:19 -0700
Re: specifying semantics, was Formatting of Language LRMs "lpsantil@gmail.com" <lpsantil@gmail.com> - 2014-06-24 13:12 -0700
Re: specifying semantics, was Formatting of Language LRMs George Neuner <gneuner2@comcast.net> - 2014-06-26 00:54 -0400
Re: specifying semantics, was Formatting of Language LRMs Andy Walker <news@cuboid.co.uk> - 2014-06-28 20:10 +0100
Re: specifying semantics, was Formatting of Language LRMs George Neuner <gneuner2@comcast.net> - 2014-06-28 22:43 -0400
Re: BNF, was specifying semantics wclodius@earthlink.net (William Clodius) - 2014-06-30 22:00 -0600
Re: specifying semantics, was Formatting of Language LRMs Ivan Godard <ivan@ootbcomp.com> - 2014-06-28 12:25 -0700
Re: specifying semantics, was Formatting of Language LRMs Andy Walker <news@cuboid.co.uk> - 2014-06-29 11:19 +0100
Re: specifying semantics, was Formatting of Language LRMs George Neuner <gneuner2@comcast.net> - 2014-06-29 07:56 -0400
Re: specifying semantics, was Formatting of Language LRMs Ivan Godard <ivan@ootbcomp.com> - 2014-06-29 11:49 -0700
Re: specifying semantics, was Formatting of Language LRMs Gene Wirchenko <genew@telus.net> - 2014-06-30 18:09 -0700
Re: specifying semantics, was Formatting of Language LRMs Ivan Godard <ivan@ootbcomp.com> - 2014-06-30 20:53 -0700
Re: Algol history, was specifying semantics anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-07-03 11:51 +0000
Re: Algol history, was specifying semantics Ivan Godard <ivan@ootbcomp.com> - 2014-07-03 22:20 -0700
Re: Algol history, was specifying semantics wclodius@earthlink.net (William Clodius) - 2014-07-04 15:52 -0600
Re: Algol history, was specifying semantics glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2014-07-07 05:49 +0000
Re: Algol history, was specifying semantics Ivan Godard <ivan@ootbcomp.com> - 2014-07-07 10:48 -0700
Re: Algol history, was specifying semantics glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2014-07-07 19:49 +0000
Re: Algol history, was specifying semantics glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2014-07-07 19:43 +0000
Re: specifying semantics, was Formatting of Language LRMs Gene Wirchenko <genew@telus.net> - 2014-07-03 21:44 -0700
Re: specifying semantics, was Formatting of Language LRMs anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-07-02 09:51 +0000
Re: specifying semantics, was Formatting of Language LRMs Stefan Monnier <monnier@iro.umontreal.ca> - 2014-07-03 10:15 -0400
Re: specifying semantics, was Formatting of Language LRMs glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2014-07-04 06:08 +0000
Re: specifying semantics, was Formatting of Language LRMs Hans-Peter Diettrich <DrDiettrich1@aol.com> - 2014-07-04 08:51 +0200
Re: Parsing Fortran, was specifying semantics glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2014-07-04 17:53 +0000
Re: Parsing Fortran, was specifying semantics wclodius@earthlink.net (William Clodius) - 2014-07-04 15:57 -0600
Re: Formatting of Language LRMs mertesthomas@gmail.com - 2014-06-30 12:04 -0700
Re: Formatting of Language LRMs federation2005@netzero.com - 2014-07-28 17:55 -0700
Re: Formatting of Language LRMs federation2005@netzero.com - 2014-08-01 14:58 -0700
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