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Re: [COFF] [TUHS] History of popularity of C

by Dan Cross

[-TUHS, +COFF as per wkt's request] On Sun, Jun 7, 2020 at 8:26 PM Bram Wyllie <bramwyllie(a)gmail.com> wrote: > Dependent types aren't needed for sum types though, which is what you'd > normally use for an array that carries its size, correct? > No, I don't think so. I've never heard of the dimensionality of an array in such a context described in terms of a sum type, but have often heard of it described in terms of a dependent type. However, I'm no type theorist. - Dan C.

4 years, 6 months

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Re: [COFF] Comparative languages

by Warren Toomey

All, as the discussion on C has moved on to other languages, we might move the followups to COFF. Thanks, Warren

4 years, 6 months

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Re: [COFF] was [TUHS] - History of popularity of C

by Clem Cole

Moving to COFF where this discussion really belongs ... On Sun, Jun 7, 2020 at 2:51 PM Nemo Nusquam <cym224(a)gmail.com> wrote: > On 06/07/20 11:26, Clem Cole wrote (in part): > > Neither language is used for anything in production in our world at this > point. > > They seem to be used in some worlds: https://blog.golang.org/10years and > https://www.rust-lang.org/production Nemo, That was probably not my clearest wording. I did not mean to imply either Go or Rust was not being used by any imagination. My point was that in SW development environments that I reside (HPC, some startups here in New England and the Bay Area, as well as Intel in general) -- Go and Rust both have smaller use cases compared to C and C++ (much less Python and Java for that matter). And I know of really no 'money' project that relies yet on either. That does not mean I know of no one using either; as I know of projects using both (including a couple of my own), but no one that had done anything production or deployed 'mission-critical' SW with one or the other. Nor does that mean it has not happened, it just means I have not seen been exposed. I also am saying that in my own personal opinion, I expect it too, in particular in Go in userspace code - possibly having a chance to push out Java and hopefully pushing out C++ a bit. My response was to an earlier comment about C's popularity WRT to C++. I answered with my experience and I widened it to suggest that maybe C++ was not the guaranteed incumbent as the winner for production. What I did not say then, but I alluded too was the particularly since nothing in nearly 70 years has displaced Fortran, which >>is<< still the #1 language for production codes (as you saw with the Archer statistics I pointed out). Reality time ... Intel, IBM, *et al,* spend a lot of money making sure that there are >>production quality<< Fortran compilers easily available. Today's modern society is from Weather prediction to energy, to param, chemistry, and physics. As I have here and in other places, over my career, Fortran has paid me and my peeps salary. It is the production enabler and without a solid answer to having a Fortran solution, you are unlikely to make too much progress, certainly in the HPC space. Let me take this in a slightly different direction. I tend to use the 'follow the money' as a way to root out what people care about. Where firms spend money to create or purchase tools to help their staff? The answer is in tools that give them return that they can measure. So using that rule: What programming languages have the largest ecosystems for tools that help find performance and operation issues? Fortran, C, C++ have the largest that I know. My guess would be Java and maybe JavaScript/PHP would be next, but I don't know of any. If I look at Intel, were do we spend money on the development tools: C/C++ and Fortran (which all use a common backend) are #1. Then we invest in other versions of the same (GCC/LLVM) for particularly things we care about. After that, it's Python and used to be Java and maybe some JavaScript. Why? because ensuring that those ecosystems are solid on devices that we make is good for us, even it means we help some of our competitors' devices also. But our investment helps us and Fortran, C/C++ is where people use our devices (and our most profitable versions in particular), so it's our own best interest to make sure there are tools to bring out the best. BTW: I might suggest you take a peek at where other firms do the same thing, and I think you'll find the follow the money rule is helpful to understand what people care the most about.

4 years, 6 months

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X Windows use in Nutek Mac clone

by Wesley Parish

Hi I'm wondering if anybody knows what happened with this? (Besides the fact it crashed and burnt. I mean, where are the source trees?) lowendmac.com/2016/nutek-mac-clones/ It was a Macintosh clone that reverse-engineered the Mac interface and appearance, using the X Window System as the GUI library - what in Macs of that era was locked into the Mac system BIOS. As such, it's an interesting use of the X Window System. Wesley Parish

4 years, 6 months

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Re: [COFF] [TUHS] History of popularity of C

by Dan Cross

Cc: to COFF, as this isn't so Unix-y anymore. On Tue, May 26, 2020 at 12:22 PM Christopher Browne <cbbrowne(a)gmail.com> wrote: > [snip] > The Modula family seemed like the better direction; those were still > Pascal-ish, but had nice intentional extensions so that they were not > nearly so "impotent." I recall it being quite popular, once upon a time, > to write code in Modula-2, and run it through a translator to mechanically > transform it into a compatible subset of Ada for those that needed DOD > compatibility. The Modula-2 compilers were wildly smaller and faster for > getting the code working, you'd only run the M2A part once in a while > (probably overnight!) > Wirth's languages (and books!!) are quite nice, and it always surprised and kind of saddened me that Oberon didn't catch on more. Of course Pascal was designed specifically for teaching. I learned it in high school (at the time, it was the language used for the US "AP Computer Science" course), but I was coming from C (with a little FORTRAN sprinkled in) and found it generally annoying; I missed Modula-2, but I thought Oberon was really slick. The default interface (which inspired Plan 9's 'acme') had this neat graphical sorting simulation: one could select different algorithms and vertical bars of varying height were sorted into ascending order to form a rough triangle; one could clearly see the inefficiency of e.g. Bubble sort vs Heapsort. I seem to recall there was a way to set up the (ordinarily randomized) initial conditions to trigger worst-case behavior for quick. I have a vague memory of showing it off in my high school CS class. - Dan C.

4 years, 7 months

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Pointers for maths routines in "assembly"

by Warren Toomey

Hi all, I have a strange question and I'm looking for pointers. Assume that you can multiply two 8-bit values in hardware and get a 16-bit result (e.g. ROM lookup table). It's straightforward to use this to multiply two 16-bit values: AABB * CCDD ---- PPPP = BB*DD QQQQ00 = BB*CC RRRR00 = AA*DD SSSS0000 = AA*CC -------- 32-bit result But if the hardware can only provide the low eight bits of the 8-bit by 8-bit multiply, is it still possible to do a 16-bit by 16-bit multiply? Next question, is it possible to do 16-bit division when the hardware can only do 8-bit divided by 8-bit. Ditto 16-bit modulo with only 8-bit modulo? Yes, I could sit down and nut it all out from scratch, but I assume that somewhere this has already been done and I could use the results. Thanks in advance for any pointers. Warren ** Back story. I'm designing an 8-bit TTL CPU which has 8-bit multiply, divide and modulo in a ROM table. I'd like to write subroutines to do 16-bit and 32-bit integer maths.

4 years, 7 months

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Re: [COFF] [TUHS] v7 K&R C

by Dan Cross

On Sun, May 17, 2020 at 12:24 PM Paul Winalski <paul.winalski(a)gmail.com> wrote: > On 5/16/20, Steffen Nurpmeso <steffen(a)sdaoden.eu> wrote: > > > > Why was there no byte or "mem" type? > > These days machine architecture has settled on the 8-bit byte as the > unit for addressing, but it wasn't always the case. The PDP-10 > addressed memory in 36-bit units. The character manipulating > instructions could deal with a variety of different byte lengths: you > could store six 6-bit BCD characters per machine word, Was this perhaps a typo for 9 4-bit BCD digits? I have heard that a reason for the 36-bit word size of computers of that era was that the main competition at the time was against mechanical calculator, which had 9-digit precision. 9*4=36, so 9 BCD digits could fit into a single word, for parity with the competition. 6x6-bit data would certainly hold BAUDOT data, and I thought the Univac/CDC machines supported a 6-bit character set? Does this live on in the Unisys 1100-series machines? I see some reference to FIELDATA online. I feel like this might be drifting into COFF territory now; Cc'ing there. or five ASCII > 7-bit characters (with a bit left over), or four 8-bit characters > (ASCII plus parity, with four bits left over), or four 9-bit > characters. > > Regarding a "mem" type, take a look at BLISS. The only data type that > language has is the machine word. > > > +getfield(buf) > > +char buf[]; > > +{ > > + int j; > > + char c; > > + > > + j = 0; > > + while((c = buf[j] = getc(iobuf)) >= 0) > > + if(c==':' || c=='\n') { > > + buf[j] =0; > > + return(1); > > + } else > > + j++; > > + return(0); > > +} > > > > so here the EOF was different and char was signed 7-bit it seems. > > That makes perfect sense if you're dealing with ASCII, which is a > 7-bit character set. To bring it back slightly to Unix, when Mary Ann and I were playing around with First Edition on the emulated PDP-7 at LCM+L during the Unix50 event last USENIX, I have a vague recollection that the B routine for reading a character from stdin was either `getchar` or `getc`. I had some impression that this did some magic necessary to extract a character from half of an 18-bit word (maybe it just zeroed the upper half of a word or something). If I had to guess, I imagine that the coincidence between "character" and "byte" in C is a quirk of this history, as opposed to any special hidden meaning regarding textual vs binary data, particularly since Unix makes no real distinction between the two: files are just unstructured bags of bytes, they're called 'char' because that was just the way things had always been. - Dan C.

4 years, 7 months

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Re: [COFF] [TUHS] v7 K&R C

by Adam Thornton

On May 14, 2020, at 10:32 AM, Larry McVoy <lm(a)mcvoy.com> wrote: > I'm being a whiney grumpy old man, I’ve been one of those since I was, like, 20. I am finally growing into it. It’s kinda nice. Adam

4 years, 7 months

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Re: [COFF] [TUHS] "7th Edition UNIX TM?? Summary" => "â??7th Edition UNIX â?? Summaryâ => â?????7th Edition UNIX â?????? Summaryâ???

by Greg 'groggy' Lehey

[redirecting to COFF] On Wednesday, 15 April 2020 at 18:19:57 +1000, Dave Horsfall wrote: > On Wed, 15 Apr 2020, Don Hopkins wrote: > >> I love how in a discussion of how difficult it was to publish a book on >> Unix with the correct punctuation characters 42 years ago, we still >> can???t even quote the title of the book in a discussion about Unix >> without the punctuation characters degrading and mutating each round >> trip. > > Well, I'm not the one here using Windoze... Arguably Microsoft does it better than Unix. Most of the issues are related to the character encoding. And as Don's headers say: X-Mailer: Apple Mail (2.3608.60.0.2.5) I agree with Don. I use mutt, which has many advantages, but sane character encoding isn't one of them. Greg -- Sent from my desktop computer. Finger grog(a)lemis.com for PGP public key. See complete headers for address and phone numbers. This message is digitally signed. If your Microsoft mail program reports problems, please read http://lemis.com/broken-MUA

4 years, 8 months

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Re: [COFF] [TUHS] Plan 9 from outer space ?

by Adam Thornton

So it could be the lack of televised sports getting to me in these shelter-in-place days, but, I mean, sure, I guess I’ll throw in some bucks for a pay-per-view of a Pike/Thompson cage match. FIGHT! Followups set. > On Apr 18, 2020, at 6:28 PM, Rob Pike <robpike(a)gmail.com> wrote: > It wasn't my intention. > On Sun, Apr 19, 2020 at 11:12 AM Ken Thompson <ken(a)google.com> wrote: >> >> you shouldn't have shut down this discussion. >> On Sat, Apr 18, 2020 at 3:27 PM Rob Pike <robpike(a)gmail.com> wrote: >>> ``because''.

4 years, 8 months

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