[PPL-devel] PIP and SWI-Prolog, bug?

[Fred Mesnard]

Hi there!


I am using PPL 1.0pre1 (GIT version) with SWI-Prolog  6.1.3 and I think I find a bug wrt PIP:

   Call: (8) ppl_new_PIP_Problem_from_space_dimension(6, _G10879) ? skip
   Exit: (8) ppl_new_PIP_Problem_from_space_dimension(6, 935460) ? creep

   Call: (8) ppl_PIP_Problem_add_constraints(935460, [A-B-C+D>=0, F= -A+B+E, D= -1-A+B+C]) ? creep
   Exit: (8) ppl_PIP_Problem_add_constraints(935460, []) ? 

   Call: (8) ppl_PIP_Problem_is_satisfiable(935460) ? skip
   Exit: (8) ppl_PIP_Problem_is_satisfiable(935460) ?

IMO, this last call should fail because the [A-B-C+D>=0, F= -A+B+E, D= -1-A+B+C] is not satisfiable.
Note that [A-B-C+D>=0, D= -1-A+B+C] is correctly reported as unsatisfiable.

Do you confirm it's a bug from PIP?


Thanks in advance,
Fred


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