Gpc June 2010

gpc@gnu.de

8 participants
7 discussions

Inefficiency of `mod'
by Emil Jerabek 25 Oct '10

25 Oct '10

Hi, during some debugging I noticed that GPC generates very hairy code for the `mod' operator with signed arguments. A closer look revealed that the code contains a lot of branching on conditions which can be determined on compile time, and most surprisingly, the value of X mod Y is recomputed _twice_, if X is negative. (I've attached a commented assembler dump.) This may be partially a back-end problem (CSE?), but I feel there's something wrong in the relevant code in gpc-common.c (… [View More]

10 16

Re: close(file); always necessary??
by samiam＠moorecad.com 19 Jun '10

19 Jun '10

Hence the reference count stuffs. I did a paper analysis once, I decided that: 1. To do true automated storage recycling, you have to track each pointer leaving scope, which means that you have to know where every pointer is. 2. Be ready to reference count each pointer, that is, each copy operation increments the reference count, and each dynamic entry gets a reference counter that is initially one for the pointer that is returned. 3. Decrement the reference counter each time any pointer … [View More]

2 1

Re: close(file); always necessary??
by samiam＠moorecad.com 18 Jun '10

18 Jun '10

2 1

Re: close(file); always necessary??
by samiam＠moorecad.com 15 Jun '10

15 Jun '10

2 1

close(file); always necessary??
by Rugxulo 15 Jun '10

15 Jun '10

Hey, In non-standard Pascal mode, does it matter if I explicitly close the file or not? E.g., "close(file);", is that done automatically or is it implementation defined? (I'm 99% sure DOS always closes files upon exit.) I'm just wondering if that's a fair assumption for Linux, etc. (though I kinda doubt it).

3 2

3 points
by spir 14 Jun '10

14 Jun '10

Hello, I'm am amateur programmer, new to gpc and rather new to Pascal as well. I wonder whether this list is a proper place to find help in learning the language, and in using it for a few projects of mine. If yes, then below is a first series of diverse questions. I will have some more as I discover the language (including some stupid ones, certainly ;-). [Note: I have a candidate answer to the questions, but ask anyway to be sure, and stop wondering.] -1- writing arrays & records What … [View More]

4 5

mixed comments
by Rugxulo 06 Jun '10

06 Jun '10

With apologies if this has already been mentioned. (I don't feel like searching the mailing list archives right now, and I haven't checked the test suite.) I just thought it was funny / interesting. ;-) { using GPC 20070904 / GCC 3.4.4 via DJGPP (gpc.info) : "GPC's default behaviour is (like BP) not to allow mixed comments" ... except that it allows it by ignoring it, not reporting an error (which is what was implied, or so I thought!) } { $ extended-pascal} { says "Hello, … [View More]

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Gpc June 2010