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Special Values for Dogelog Player (Re: Full Multiply in Railgun CLP)

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Dogelog Player is a novel Prolog system
for the JavaScript, Python and Java target.
It is unique in that most of its core is written
in 100% Prolog itself. While it might not be as
posh as other Prolog system, the addition of
special values gives it nevertheless an
eclectic shoe shine.

Our introduction of positive infinity 0rInf
and negative infinity -0rInf is rather surgical.
We didn’t touch the basic arithmetic like (+)/2,
(-)/2, (*)/2, etc.. or trigonometric functions
like sin/2, cos/2, etc.. But they are now
understood by min/2 and max/2, and
arithmetic comparison as well.

See also:

Special Values for Dogelog Player
https://medium.com/2989/8cced7f3d3e7

Mild Shock schrieb:
> 
> Railgun CLP is a portable constraint solver
> library, developed in connection with Dogelog
> Player. It requires nothing more than ISO core
> standard Prolog and shows an amazing performance.
> We added full multiply.
> 
> We discussed full multiply which can extend the
> constraint solver from positive intervals, to
> negative and zero centered intervals. The realized
> compilation scheme does incure a small penality
> and in examples such as Pythago and Euler we still
> see a 5x to 15x speed-up against SWI-Prolog.
> 
> See also:
> 
> Full Multiply in Railgun CLP
> https://medium.com/2989/26eb4445e5b1
> 
> Mild Shock schrieb:
>> Dear All,
>>
>> We are happy to announce a new edition
>> of the Dogelog Player:
>>
>> - Enhanced library(compat):
>> We introduced a new built-in occurs_check/2.
>> The predicate could be bootstrapped from
>> unify_with_occurs_check/2 via occurs_check(V,T)
>> :- \+ unify_with_occurs_check(V, T). But
>> tapping into the native check gives better performance.
>>
>> - Enhanced library(math):
>> We introduced sqrtrem/3 and isqrt/2 built-ins,
>> for integer square root. The former is a predicate
>> that also computes a reminder, and the later is
>> an evaluable predicate, that suppresses the reminder.
>>
>> - New Railgun CLP:
>> What began as a sport in December 2025 to explore
>> a constraint solver that only uses ISO core
>> standard Prolog. Is now a full project with
>> iterative milestones. In this release we provide
>> the basic vocabulary of CLP(FD), and an enhanced
>> solver that uses min/max based partial consistency.
>>
>> Have Fun!
>>
>> Jan Burse, https://www.herbrand.ai/ , 22.01.2026
> 

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Special Values for Dogelog Player (Re: Full Multiply in Railgun CLP) Mild Shock <janburse@fastmail.fm> - 2026-02-18 00:01 +0100

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