Re: Prioritize Performance over Correctness

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From	Tim Rentsch <tr.17687@z991.linuxsc.com>
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Subject	Re: Prioritize Performance over Correctness
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Keith Thompson <Keith.S.Thompson+u@gmail.com> writes:

> Tim Rentsch <tr.17687@z991.linuxsc.com> writes:
>
>> Keith Thompson <Keith.S.Thompson+u@gmail.com> writes:
>>
>>> The standard doesn't say that function pointers can be converted to
>>> object pointer types or vice versa -- no does it say that they can't.
>>> My conclusion is that the behavior of such a conversion is undefined
>>> by omission.
>>
>> This understanding isn't right, or at best incomplete.
>
> [snip]
>
> I disagree.

Well, let's explore that.  Here is the context that was snipped:

> Keith Thompson <Keith.S.Thompson+u@gmail.com> writes:
> 
>> The standard doesn't say that function pointers can be converted to
>> object pointer types or vice versa -- no does it say that they can't.
>> My conclusion is that the behavior of such a conversion is undefined
>> by omission.
> 
> This understanding isn't right, or at best incomplete.  A statement
> like "a pointer to an object type may be converted to a pointer to a
> different object type" is not a definition of behavior but a statement
> about what is part of the C language.  The C standard lists all cases
> where a conversion may be done to or from a pointer type;  for
> pointers, any case where there is not an explicit allowance is not
> part of the C language.  Because there is no explicit allowance, an
> implementation is free to reject any translation unit that calls for
> such a conversion.  Because there is no requirement for a diagnostic,
> an implementation is free to accept programs that do call for such a
> conversion.  Certainly if an implementation accepts a program that
> converts an object pointer to a function pointer, or vice versa, then
> the behavior of any such construct is undefined;  but implementations
> are not obliged to accept any program whose source indicates any such
> conversion.

We start with a simple program:

   // file integer.c

   int
   main( void ){
      return  0;
   }

   void *
   integer_to_pointer( long x ){
      return  (void*) x;
   }

There is no problem with this program.  It is in fact strictly
conforming.  The cast to (void*) would have potential undefined
behavior if it were executed but since the function is never called
of course that doesn't happen.  We can compile and execute it:

   gcc   -std=c99 -pedantic -o integer-gcc integer.c
   ./integer-gcc ; echo $?
   0

   clang -std=c99 -pedantic -o integer-clang integer.c
   ./integer-clang ; echo $?
   0

To continue the exploration, we consider a slightly different
program:

   // file floating.c

   int
   main( void ){
      return  0;
   }

   void *
   floating_to_pointer( double x ){
      return  (void*) x;
   }

The only difference (not counting the change in function name)
between floating.c and integer.c is the type of the function
parameter, which has a real floating type rather than an integer
type.  How does that difference affect program semantics?  An easy
way to investigate that question is to try compiling and running it
(one long line of output was wrapped):

   gcc   -std=c99 -pedantic -o floating-gcc floating.c
   floating.c: In function 'floating_to_pointer':
   floating.c:10:4: error: cannot convert to a pointer type
       return  (void*) x;
       ^~~~~~
   {no executable was produced}

   clang -std=c99 -pedantic -o floating-clang floating.c
   floating.c:10:20: error: operand of type 'double' cannot be cast
    {wrapped here} to a pointer type
      return  (void*) x;
		      ^
   1 error generated.
   {no executable was produced}

Both gcc and clang consider floating.c to have a fatal error, caused
by trying to convert the double parameter x to (void*).  The
reasoning underlying this decision is fairly straightforward.  The C
standard says an integer may be converted to any pointer type;  in
contrast, the standard does not say floating values may be converted
to any kind of pointer type.  Because the standard does not include
any such provision, floating.c is attempting to use a feature not
specified in the C standard.  Because floating.c is trying to use a
feature not specified, it is not strictly conforming.  Because
floating.c is not strictly conforming, the standard does not require
it to be accepted.  Because there is no requirement that floating.c
be accepted, both gcc and clang choose to give an error and reject
it.  I don't see any other chain of reasoning that would allow these
compilers to summarily dismiss floating.c.  So I think we can feel
fairly confident that the reasoning above explains the rationale for
these compilers to not allow floating.c.

Now let's look at converting a pointer-to-function to an object
pointer type.  Here is a program to help investigate that:

   // file pointers.c

   int
   main( void ){
      return  0;
   }

   void *
   function_pointer_to_object_pointer( void x(void) ){
      return  (void*) x;
   }

The relationship between floating types and pointer types is
analogous to the relationship beween function pointer types and
object pointer types:  the C standard explicitly allows some
conversions of these types, but the standard does not say that a
function pointer type may be converted to an object pointer type,
just as it does not say that a floating type may be converted to a
pointer type.  What may we expect for the semantics of pointers.c?
As before, we try compiling (two long lines of output wrapped):

   gcc   -std=c99 -pedantic -o pointers-gcc-warnings pointers.c
   pointers.c: In function 'function_pointer_to_object_pointer':
   pointers.c:10:12: warning: ISO C forbids conversion of function pointer
    {wrapped here} to object pointer type [-Wpedantic]
       return  (void*) x;
	       ^
   ./pointers-gcc-warnings ; echo $?
   0

   gcc   -std=c99 -pedantic-errors -o pointers-gcc-errors pointers.c
   pointers.c: In function 'function_pointer_to_object_pointer':
   pointers.c:10:12: error: ISO C forbids conversion of function pointer
    {wrapped here} to object pointer type [-Wpedantic]
       return  (void*) x;
	       ^
   {no executable was produced}

   clang -std=c99 -pedantic -o pointers-clang pointers.c
   ./pointers-clang ; echo $?
   0

(Here we have run gcc twice, first giving option -pedantic and next
giving option -pedantic-errors.)  The behaviors of gcc and clang are
different:  clang compiles pointers.c without giving any diagnostics,
but gcc gives a diagnostic saying "ISO C forbids conversion of
function pointer to object pointer type [-Wpedantic]", which is only
a warning under -pedantic but an error under -pedantic-errors.

In both cases how the compilers behave is consistent with the C
standard.  There is no requirement to accept pointers.c, using the
same reasoning explained above, and gcc makes that choice, rejecting
pointers.c when -pedantic-errors is in force.  At the same time
though there is no requirement /not/ to accept pointers.c, and clang
chooses to accept it without complaint.  (Of course diagnostics may
be given whether a program is accepted or not.)

Note that if converting a floating type or a function pointer type
to a (void*) were only undefined behavior, and not more than that,
then all of these programs would be strictly conforming, and so
would have to be accepted.  But that doesn't match how the compilers
behave.

Note also that the behaviors of gcc and clang are consistent with
what I said before, which was given in the re-inserted excerpt
above.

Considering all that, what is your current assessment?  Is it your
position that your understanding of the C standard is somehow better
than not only how I read it but also how it is understood by both
gcc developers and clang developers?  Or have you changed your
views?

Thread

Prioritize Performance over Correctness Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2026-07-22 01:38 +0200
  Re: Prioritize Performance over Correctness Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-07-21 17:26 -0700
    Re: Prioritize Performance over Correctness cross@spitfire.i.gajendra.net (Dan Cross) - 2026-07-22 01:50 +0000
      Re: Prioritize Performance over Correctness Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-07-21 20:25 -0700
        Re: Prioritize Performance over Correctness cross@spitfire.i.gajendra.net (Dan Cross) - 2026-07-22 17:37 +0000
      Re: Prioritize Performance over Correctness "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-07-22 13:26 -0700
    Re: Prioritize Performance over Correctness Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2026-07-22 07:33 +0200
      Re: Prioritize Performance over Correctness David Brown <david.brown@hesbynett.no> - 2026-07-22 10:41 +0200
        Re: Prioritize Performance over Correctness BGB <cr88192@gmail.com> - 2026-07-22 18:08 -0500
          Re: Prioritize Performance over Correctness David Brown <david.brown@hesbynett.no> - 2026-07-23 10:31 +0200
            Re: Prioritize Performance over Correctness Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-07-23 14:31 -0700
              Re: Prioritize Performance over Correctness Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-07-23 14:48 -0700
                Re: Prioritize Performance over Correctness Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-07-23 15:11 -0700
                Re: Prioritize Performance over Correctness David Brown <david.brown@hesbynett.no> - 2026-07-24 09:23 +0200
                Re: Prioritize Performance over Correctness Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-07-24 03:14 -0700
                Re: Prioritize Performance over Correctness scott@slp53.sl.home (Scott Lurndal) - 2026-07-24 14:56 +0000
                Re: Prioritize Performance over Correctness antispam@fricas.org (Waldek Hebisch) - 2026-07-25 16:30 +0000
                Re: Prioritize Performance over Correctness James Kuyper <jameskuyper@alumni.caltech.edu> - 2026-07-27 09:33 -0400
                Re: Prioritize Performance over Correctness Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-07-28 00:22 +0800
                Re: Prioritize Performance over Correctness Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-07-27 12:58 -0700
                Re: Prioritize Performance over Correctness BGB <cr88192@gmail.com> - 2026-07-27 15:37 -0500
                Re: Prioritize Performance over Correctness James Kuyper <jameskuyper@alumni.caltech.edu> - 2026-07-27 17:13 -0400
                Re: Prioritize Performance over Correctness Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-07-27 15:17 -0700
                Re: Prioritize Performance over Correctness scott@slp53.sl.home (Scott Lurndal) - 2026-07-28 01:18 +0000
                Re: Prioritize Performance over Correctness Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-07-28 15:40 +0800
                Re: Prioritize Performance over Correctness cross@spitfire.i.gajendra.net (Dan Cross) - 2026-07-28 14:18 +0000
                Multics( Re: Prioritize Performance over Correctness) Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-07-28 22:48 +0800
                Re: Multics( Re: Prioritize Performance over Correctness) scott@slp53.sl.home (Scott Lurndal) - 2026-07-28 15:08 +0000
                Re: Multics( Re: Prioritize Performance over Correctness) Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-07-28 23:30 +0800
                Re: Multics( Re: Prioritize Performance over Correctness) cross@spitfire.i.gajendra.net (Dan Cross) - 2026-07-28 19:08 +0000
                Re: Multics( Re: Prioritize Performance over Correctness) Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-07-29 04:08 +0800
                Re: Multics( Re: Prioritize Performance over Correctness) cross@spitfire.i.gajendra.net (Dan Cross) - 2026-07-28 22:15 +0000
                Re: Multics( Re: Prioritize Performance over Correctness) cross@spitfire.i.gajendra.net (Dan Cross) - 2026-07-28 22:26 +0000
                Re: Multics( Re: Prioritize Performance over Correctness) Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-07-29 06:41 +0800
                Re: Multics( Re: Prioritize Performance over Correctness) cross@spitfire.i.gajendra.net (Dan Cross) - 2026-07-28 23:23 +0000
                Picture of Organicks' book Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-07-29 16:01 +0800
                Re: Picture of Organicks' book cross@spitfire.i.gajendra.net (Dan Cross) - 2026-07-29 13:46 +0000
                Re: Picture of Organicks' book R Kym Horsell <kymhorsell@gmail.com> - 2026-07-29 16:54 +0000
                Re: Multics( Re: Prioritize Performance over Correctness) Cóilín Nioclásín Glostéir <thanks-to@Taf.com> - 2026-07-29 23:22 +0000
                Re: Multics( Re: Prioritize Performance over Correctness) Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-08-15 15:55 -0700
                Re: Multics( Re: Prioritize Performance over Correctness) cross@spitfire.i.gajendra.net (Dan Cross) - 2026-07-28 18:58 +0000
                Re: Multics( Re: Prioritize Performance over Correctness) Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-07-29 04:10 +0800
                Re: Multics( Re: Prioritize Performance over Correctness) cross@spitfire.i.gajendra.net (Dan Cross) - 2026-07-28 22:20 +0000
                Re: Multics( Re: Prioritize Performance over Correctness) scott@slp53.sl.home (Scott Lurndal) - 2026-07-29 14:44 +0000
                Re: Multics( Re: Prioritize Performance over Correctness) cross@spitfire.i.gajendra.net (Dan Cross) - 2026-07-30 02:08 +0000
                Re: Prioritize Performance over Correctness Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-08-16 07:59 -0700
                Re: Prioritize Performance over Correctness Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-07-27 17:59 -0700
                Re: Prioritize Performance over Correctness Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-07-28 15:42 +0800
                Re: Prioritize Performance over Correctness Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-07-28 03:22 -0700
                Re: Prioritize Performance over Correctness Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-07-28 19:21 +0800
                Re: Prioritize Performance over Correctness bart <bc@freeuk.com> - 2026-07-28 13:02 +0100
                Re: Prioritize Performance over Correctness Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-07-28 20:18 +0800
                Re: Prioritize Performance over Correctness bart <bc@freeuk.com> - 2026-07-28 14:17 +0100
                Re: Prioritize Performance over Correctness BGB <cr88192@gmail.com> - 2026-07-28 16:02 -0500
                Re: Prioritize Performance over Correctness Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-07-29 16:45 +0800
                Re: Prioritize Performance over Correctness bart <bc@freeuk.com> - 2026-07-29 12:03 +0100
                Re: Prioritize Performance over Correctness Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-07-29 19:32 +0800
                Re: Prioritize Performance over Correctness bart <bc@freeuk.com> - 2026-07-29 13:42 +0100
                Re: Prioritize Performance over Correctness Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-07-29 20:49 +0800
                Re: Prioritize Performance over Correctness bart <bc@freeuk.com> - 2026-07-29 16:01 +0100
                Re: Prioritize Performance over Correctness Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-07-29 12:53 -0700
                Re: Prioritize Performance over Correctness James Kuyper <jameskuyper@alumni.caltech.edu> - 2026-07-31 14:21 -0400
                Re: Prioritize Performance over Correctness bart <bc@freeuk.com> - 2026-07-31 20:07 +0100
                Re: Prioritize Performance over Correctness Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-07-31 13:00 -0700
                Re: Prioritize Correctness Over Performance Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-08-01 02:34 +0000
                Re: Prioritize Performance over Correctness Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-07-28 16:08 -0700
                Re: Prioritize Performance over Correctness cross@spitfire.i.gajendra.net (Dan Cross) - 2026-07-28 23:28 +0000
                Re: Prioritize Performance over Correctness cross@spitfire.i.gajendra.net (Dan Cross) - 2026-07-28 14:22 +0000
                Re: Prioritize Performance over Correctness "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-07-28 13:51 -0700
                Re: Prioritize Performance over Correctness James Kuyper <jameskuyper@alumni.caltech.edu> - 2026-07-28 20:32 -0400
                Re: Prioritize Performance over Correctness cross@spitfire.i.gajendra.net (Dan Cross) - 2026-07-28 14:20 +0000
                Re: Prioritize Performance over Correctness "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-07-28 13:54 -0700
                Re: Prioritize Performance over Correctness Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-07-29 05:00 +0800
                Re: Prioritize Performance over Correctness James Kuyper <jameskuyper@alumni.caltech.edu> - 2026-07-28 20:25 -0400
                Re: Prioritize Performance over Correctness "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-07-29 14:55 -0700
                Re: Prioritize Performance over Correctness James Kuyper <jameskuyper@alumni.caltech.edu> - 2026-07-28 20:31 -0400
                Re: Prioritize Performance over Correctness Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-07-28 21:26 -0700
                Re: Prioritize Performance over Correctness "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-07-29 14:57 -0700
                Re: Prioritize Performance over Correctness Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-07-29 15:33 -0700
                Re: Prioritize Performance over Correctness "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-07-29 16:22 -0700
                Re: Prioritize Performance over Correctness Richard Harnden <richard.nospam@gmail.invalid> - 2026-07-30 07:40 +0100
                Re: Prioritize Correctness over Performance Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-07-30 06:48 +0000
                Re: Prioritize Correctness over Performance James Kuyper <jameskuyper@alumni.caltech.edu> - 2026-07-30 06:50 -0400
                Re: Prioritize Correctness over Performance Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-07-30 03:54 -0700
                Re: Prioritize Correctness over Performance James Kuyper <jameskuyper@alumni.caltech.edu> - 2026-07-30 08:24 -0400
                Re: Prioritize Correctness over Performance Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-07-30 14:40 -0700
                Re: Prioritize Correctness over Performance "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-07-30 19:39 -0700
                Re: Prioritize Performance over Correctness James Kuyper <jameskuyper@alumni.caltech.edu> - 2026-07-30 06:44 -0400
                Re: Prioritize Performance over Correctness Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-07-30 21:00 +0000
                Re: Prioritize Performance over Correctness Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-07-30 14:38 -0700
                Re: Prioritize Performance over Correctness Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-07-30 21:53 +0000
                Re: Prioritize Performance over Correctness Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-07-30 15:10 -0700
                Re: Prioritize Performance over Correctness "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-07-30 19:40 -0700
                Re: Prioritize Performance over Correctness cross@spitfire.i.gajendra.net (Dan Cross) - 2026-07-31 02:43 +0000
                Re: Prioritize Performance over Correctness "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-07-30 19:44 -0700
                Re: Prioritize Performance over Correctness "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-07-30 19:58 -0700
                Re: Prioritize Performance over Correctness "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-08-01 01:25 -0700
                Re: Prioritize Performance over Correctness David Brown <david.brown@hesbynett.no> - 2026-08-02 23:14 +0200
                Re: Prioritize Performance over Correctness "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-08-02 14:37 -0700
                Re: Prioritize Performance over Correctness Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-08-02 22:51 +0000
                Re: Prioritize Performance over Correctness Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-08-02 16:43 -0700
                Re: Prioritize Performance over Correctness "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-08-03 12:03 -0700
                Re: Prioritize Correctness Over Performance Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-08-03 23:49 +0000
                Re: Prioritize Correctness Over Performance "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-08-03 19:35 -0700
                MS-DOS memory models (was: Re: Prioritize Performance over Correctness) Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-08-03 08:08 +0800
                Re: Prioritize Performance over Correctness David Brown <david.brown@hesbynett.no> - 2026-08-03 10:16 +0200
                Re: Prioritize Performance over Correctness Richard Harnden <richard.nospam@gmail.invalid> - 2026-08-03 10:41 +0100
                Re: Prioritize Performance over Correctness David Brown <david.brown@hesbynett.no> - 2026-08-03 12:28 +0200
                Malicious Computer Architecture (was: Re: Prioritize Performance over Correctness) Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-08-03 19:23 +0800
                Re: Malicious Computer Architecture David Brown <david.brown@hesbynett.no> - 2026-08-03 14:01 +0200
                Re: Malicious Computer Architecture Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-08-03 22:52 +0800
                Re: Malicious Computer Architecture David Brown <david.brown@hesbynett.no> - 2026-08-03 19:41 +0200
                Re: Malicious Computer Architecture "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-08-03 13:13 -0700
                Re: Malicious Computer Architecture "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-08-03 13:10 -0700
                Re: Malicious Computer Architecture (was: Re: Prioritize Performance over Correctness) scott@slp53.sl.home (Scott Lurndal) - 2026-08-03 14:29 +0000
                Johnny Depp prevention [Windows 11 etc...] (Was: Malicious Computer Architecture) Mild Shock <janburse@fastmail.fm> - 2026-08-03 18:10 +0200
                But how can you deploy. when its ROM? (Was: Johnny Depp prevention [Windows 11 etc...]) Mild Shock <janburse@fastmail.fm> - 2026-08-03 18:15 +0200
                GPU Elasticity: Collective Communications Libraries (Was: But how can you deploy. when its ROM?) Mild Shock <janburse@fastmail.fm> - 2026-08-07 14:37 +0200
                What are Flits and Phits? [Network on a Chip] (Re: GPU Elasticity: Collective Communications Libraries) Mild Shock <janburse@fastmail.fm> - 2026-08-07 18:07 +0200
                Cristallina: Thank you for the Beam (Re: What are Flits and Phits? [Network on a Chip]) Mild Shock <janburse@fastmail.fm> - 2026-08-09 21:22 +0200
                Loderunner Enemy AI better than SWI-Prolog? [Prolog Education Group] Mild Shock <janburse@fastmail.fm> - 2026-08-18 16:26 +0200
                How to shoot yourself in the foot (Re: Loderunner Enemy AI better than SWI-Prolog? [Prolog Education Group] Mild Shock <janburse@fastmail.fm> - 2026-08-18 16:50 +0200
                Re: How to shoot yourself in the foot (Re: Loderunner Enemy AI better than SWI-Prolog? [Prolog Education Group] Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-08-19 03:24 +0800
                Re: Loderunner Enemy AI better than SWI-Prolog? [Prolog Education Group] Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-08-19 03:21 +0800
                Re: Loderunner Enemy AI better than SWI-Prolog? [Prolog Education Group] Aidan Kehoe <kehoea@parhasard.net> - 2026-08-18 21:13 +0100
                Re: Loderunner Enemy AI better than SWI-Prolog? [Prolog Education Group] Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-08-18 22:49 +0000
                Re: Loderunner Enemy AI better than SWI-Prolog? [Prolog Education Group] Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-08-19 08:32 +0800
                Re: Loderunner Enemy AI better than SWI-Prolog? [Prolog Education Group] George Neuner <gneuner2@comcast.net> - 2026-08-21 02:08 -0400
                Re: Loderunner Enemy AI better than SWI-Prolog? [Prolog Education Group] Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-08-21 15:25 +0800
                Re: Loderunner Enemy AI better than SWI-Prolog? [Prolog Education Group] George Neuner <gneuner2@comcast.net> - 2026-08-21 16:28 -0400
                Re: Loderunner Enemy AI better than SWI-Prolog? [Prolog Education Group] Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-08-19 08:27 +0800
                William A. Howard solved all his 99 problems (Re: Loderunner Enemy AI better than SWI-Prolog?) Mild Shock <janburse@fastmail.fm> - 2026-08-23 01:48 +0200
                The Mac Neo is a Budget Monster [GPU Channels] (Re: What are Flits and Phits? [Network on a Chip]) Mild Shock <janburse@fastmail.fm> - 2026-08-11 16:27 +0200
                The luminaries of duct-tape engineering [Sweeney and Torvald] (Was: The Mac Neo is a Budget Monster [GPU Channels]) Mild Shock <janburse@fastmail.fm> - 2026-08-11 16:51 +0200
                Re: Malicious Computer Architecture Aidan Kehoe <kehoea@parhasard.net> - 2026-08-03 19:51 +0100
                Re: Malicious Computer Architecture Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-08-05 00:22 +0800
                Re: Malicious Computer Architecture Richard Harnden <richard.nospam@gmail.invalid> - 2026-08-04 19:10 +0100
                Re: Malicious Computer Architecture Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-08-05 03:21 +0800
                Re: Malicious Computer Architecture Kaz Kylheku <046-301-5902@kylheku.com> - 2026-08-06 21:55 +0000
                Re: Malicious Computer Architecture Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-08-07 06:31 +0800
                Re: Malicious Computer Architecture Aidan Kehoe <kehoea@parhasard.net> - 2026-08-06 23:01 +0100
                A Case for Impurity: The Applied Pi Calculus (Re: Malicious Computer Architecture) Mild Shock <janburse@fastmail.fm> - 2026-08-04 14:58 +0200
                The Sandcastle of Paul Taraus Interactors (Re: A Case for Impurity: The Applied Pi Calculus) Mild Shock <janburse@fastmail.fm> - 2026-08-04 15:10 +0200
                Re: Prioritize Performance over Correctness Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-08-03 05:34 -0700
                Re: Prioritize Performance over Correctness "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-08-03 13:04 -0700
                Re: Prioritize Correctness Over Performance Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-08-04 00:52 +0000
                Re: Prioritize Correctness Over Performance scott@slp53.sl.home (Scott Lurndal) - 2026-08-04 14:22 +0000
                Re: Prioritize Performance over Correctness Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-08-03 05:25 -0700
                Re: Prioritize Performance over Correctness David Brown <david.brown@hesbynett.no> - 2026-08-03 15:10 +0200
                Re: Prioritize Performance over Correctness "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-08-03 13:16 -0700
                Re: Prioritize Performance over Correctness James Kuyper <jameskuyper@alumni.caltech.edu> - 2026-08-03 20:29 -0400
                Re: Prioritize Performance over Correctness Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-08-03 17:55 -0700
                Re: Prioritize Performance over Correctness David Brown <david.brown@hesbynett.no> - 2026-08-04 09:12 +0200
                Re: Prioritize Performance over Correctness Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-08-21 05:49 -0700
                Re: Prioritize Performance over Correctness Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-08-21 10:38 -0700
                Re: Prioritize Performance over Correctness scott@slp53.sl.home (Scott Lurndal) - 2026-08-21 18:25 +0000
                Re: Prioritize Performance over Correctness Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-08-24 10:15 -0700
                Re: Prioritize Performance over Correctness Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-08-02 19:01 -0700
                Re: Prioritize Performance over Correctness cross@spitfire.i.gajendra.net (Dan Cross) - 2026-08-03 19:59 +0000
                Re: Prioritize Performance over Correctness Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-07-30 03:50 -0700
                Re: Prioritize Performance over Correctness "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-07-29 15:09 -0700
                Re: Prioritize Performance over Correctness Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-07-28 08:14 +0800
                Re: Prioritize Performance over Correctness Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-07-29 05:54 +0800
                Re: Prioritize Performance over Correctness steveo@panix.com (Steven M. O'Neill) - 2026-07-31 20:34 +0000
                Re: Prioritize Performance over Correctness James Kuyper <jameskuyper@alumni.caltech.edu> - 2026-07-28 19:40 -0400
                Re: Prioritize Performance over Correctness BGB <cr88192@gmail.com> - 2026-07-27 15:36 -0500
                Re: Prioritize Performance over Correctness Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-07-29 04:56 +0800
              Re: Prioritize Performance over Correctness Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2026-07-24 14:47 +0200
                Re: Prioritize Performance over Correctness David Brown <david.brown@hesbynett.no> - 2026-07-24 16:27 +0200
                Resources for Amateur Compiler Writers Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-07-25 00:52 +0800
                Re: Resources for Amateur Compiler Writers bart <bc@freeuk.com> - 2026-07-24 23:08 +0100
                Re: Resources for Amateur Compiler Writers BGB <cr88192@gmail.com> - 2026-07-24 18:50 -0500
                Re: Resources for Amateur Compiler Writers Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-07-25 01:54 +0000
                Re: Resources for Amateur Compiler Writers Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-07-25 15:20 +0800
                Re: Resources for Amateur Compiler Writers Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-07-25 07:24 +0000
                Re: Resources for Amateur Compiler Writers Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-07-25 15:30 +0800
                Re: Resources for Amateur Compiler Writers David Brown <david.brown@hesbynett.no> - 2026-07-25 10:37 +0200
                Re: Resources for Amateur Compiler Writers Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-07-27 00:35 +0800
                Re: Resources for Amateur Compiler Writers BGB <cr88192@gmail.com> - 2026-07-26 12:39 -0500
                Re: Resources for Amateur Compiler Writers bart <bc@freeuk.com> - 2026-07-26 22:27 +0100
                Re: Resources for Amateur Compiler Writers BGB <cr88192@gmail.com> - 2026-07-26 18:02 -0500
                Re: Resources for Amateur Compiler Writers Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-07-25 22:32 +0000
                Re: Resources for Amateur Compiler Writers Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-07-25 15:58 -0700
                Re: Resources for Amateur Compiler Writers David Brown <david.brown@hesbynett.no> - 2026-07-25 10:23 +0200
                Re: Resources for Amateur Compiler Writers Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-07-24 16:29 -0700
                Re: Resources for Amateur Compiler Writers Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-07-25 15:25 +0800
                Re: Resources for Amateur Compiler Writers Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-07-25 15:33 -0700
                Re: Resources for Amateur Compiler Writers Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.invalid> - 2026-07-27 00:38 +0800
                Re: Resources for Amateur Compiler Writers Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-07-26 17:06 -0700
                Re: Resources for Amateur Compiler Writers Cóilín Nioclásín Glostéir <thanks-to@Taf.com> - 2026-07-26 17:03 +0000
                Re: Prioritize Performance over Correctness BGB <cr88192@gmail.com> - 2026-07-24 16:50 -0500
                Re: Prioritize Performance over Correctness Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-07-24 16:13 -0700
            Re: Prioritize Performance over Correctness BGB <cr88192@gmail.com> - 2026-07-26 15:26 -0500
        Re: Prioritize Performance over Correctness Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2026-07-23 11:18 +0200

csiph-web