From: janburse@fastmail.fm   
      
   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 basic indexicals.   
      
   To compare our basic indexicals solutions we use 3   
   magic square problems against the Z3 SMT solver and   
   the Gecode solver. It turns out that Railgun v11 was   
   6-7x times faster than Z3 and 2x times slower than   
   Gecode. As a 100% Prolog solution we still have some   
      
   headroom, for example we could realize a native between/3.   
      
   See also:   
      
   Basic Indexicals for Railgun CLP(Z)   
   https://qiita.com/j4n_bur53/items/ddda3ba5186acddae91b   
      
   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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