Re: goto: it's conceded
Kat wrote:
>
> Jason Gade wrote:
> >
> > Kat wrote:
> > >
> > > Derek Parnell wrote:
> > > >
> > > > Kat wrote:
> > > >
> > > > > What is the depth limit to nested for/while loops in Eu?
> > > >
> > > > I think it is only limited by available memory. There is no hard-coded
> > > > limit.
> > >
> > > When you say "available memory", would that be 1Kbytes local stack space
> > > per
> > > procedure, or 64k global stack space, or the 2 gigabytes the OS will let
> > > the
> > > program have? Or somewhere in between that's undefined?
> > >
> > > Yes, real world, i hit TurboPascal's stack limit with nested loops.
> > >
> > > Kat
> >
> > Hmm. Not sure where the 1K and the 64k numbers came from, but I don't think
> > that Euphoria's loops, at least in the interpreter, rely upon the machine
> > stack.
> >
> > So I choose what's behind door number three -- the total process memory.
> >
> > I thought I had seen the 262144 number in some build files, but I couldn't
> > find
> > it when researching your answer. I definitely saw the numbers 49152 and
> > 131072
> > in there though...
>
> Everyone who has done machine coding on a C-64 knows 49152 is a warm reboot,
> so that's bad, and it's how much ram in a C-128..... and 131072 is how many
> processors in a Blue Gene/L superputer.. I don't know, perhaps Euphoria was
> meant to run on these computers too, and it's being withheld from us?
>
> Kat
Heh.
Actually, 49152 was RAM masked by ROM that could be switched in and out and was
therefore a popular location for user machine code. You had to diddle locations 0
and 1 to switch the I/O registers correctly.
(Edit: looked it up -- 49152 - 53247 was RAM. It was 40960 to 49152 which was
BASIC ROM mapped over RAM.)
How much ram in a C-128 was 131072 but I think it was banked (memory fails now!)
Plus it had an 8502 and a Z80 processor! Man, I was so envious of my friends who
had one.
I still remember poke 53280,0 poke 53281,0 to change my background to black on
the C64.
Of course, the C64's stack was only 256 bytes, stored from locations 256-511
(backwards, of course!)
Another popular location for small machine language programs was from 828 to
1019 which was the cassette tape buffer.
But yeah, now that I think about it, I think I remember that sys 49152 did a
warm reset unless that location was over-written.
Ah, those were the days!
(Yes, I had too look up some things to jog my memory).
--
A complex system that works is invariably found to have evolved from a simple
system that works.
--John Gall's 15th law of Systemantics.
"Premature optimization is the root of all evil in programming."
--C.A.R. Hoare
j.
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