145 lines
4.3 KiB
Prolog
145 lines
4.3 KiB
Prolog
/*************************************************************************
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* *
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* YAP Prolog *
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* *
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* Yap Prolog was developed at NCCUP - Universidade do Porto *
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* *
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* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
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* *
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**************************************************************************
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* *
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* File: eval.yap *
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* Last rev: *
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* mods: *
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* comments: optimise disjunction handling *
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* *
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*************************************************************************/
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/**
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* @file eval.yap
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* @author VITOR SANTOS COSTA <vsc@VITORs-MBP-2.lan>
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* @date Thu Oct 19 11:52:48 2017
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*
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* @brief compiling expressions
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*/
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:- system_module( '$_eval', [], ['$full_clause_optimisation'/4]).
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:- use_system_module( terms, [new_variables_in_term/3,
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variables_within_term/3]).
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/**
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*
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* @defgroup CompiledExpression A Compiler for Arithmetic
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* @ingroup drectives
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*
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* @{
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*/
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:- multifile '$full_clause_optimisation'/4.
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'$add_extra_safe'('$plus'(_,_,V)) --> !, [V].
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'$add_extra_safe'('$minus'(_,_,V)) --> !, [V].
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'$add_extra_safe'('$times'(_,_,V)) --> !, [V].
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'$add_extra_safe'('$div'(_,_,V)) --> !, [V].
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'$add_extra_safe'('$and'(_,_,V)) --> !, [V].
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'$add_extra_safe'('$or'(_,_,V)) --> !, [V].
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'$add_extra_safe'('$sll'(_,_,V)) --> !, [V].
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'$add_extra_safe'('$slr'(_,_,V)) --> !, [V].
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'$add_extra_safe'(C=D,A,B) :-
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!,
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( compound(C) ->
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'$variables_in_term'(C,E,A)
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;
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E=A
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),
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( compound(D) ->
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'$variables_in_term'(D,B,E)
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;
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B=E
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).
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'$add_extra_safe'(_) --> [].
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'$gen_equals'([], [], _, O, O).
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'$gen_equals'([V|Commons],[NV|NCommons], LV0, O, NO) :- V == NV, !,
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'$gen_equals'(Commons,NCommons, LV0, O, NO).
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'$gen_equals'([V|Commons],[NV|NCommons], LV0, O, OO) :-
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'$vmember'(V,LV0),
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OO = (V=NV,'$safe'(NV),NO),
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'$gen_equals'(Commons,NCommons, LV0, O, NO).
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'$gen_equals'([V|Commons],[NV|NCommons], LV0, O, OO) :-
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OO = (V=NV,NO),
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'$gen_equals'(Commons,NCommons, LV0, O, NO).
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'$safe_guard'((A,B), M) :- !,
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'$safe_guard'(A, M),
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'$safe_guard'(B, M).
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'$safe_guard'((A;B), M) :- !,
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'$safe_guard'(A, M),
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'$safe_guard'(B, M).
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'$safe_guard'(A, M) :- !,
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'$safe_builtin'(A, M).
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'$safe_builtin'(G, Mod) :-
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'$predicate_flags'(G, Mod, Fl, Fl),
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Fl /\ 0x00008880 =\= 0.
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'$vmember'(V,[V1|_]) :- V == V1, !.
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'$vmember'(V,[_|LV0]) :-
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'$vmember'(V,LV0).
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'$localise_disj_vars'((B;B2), M, (NB ; NB2), LV, LV0, LEqs) :- !,
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'$localise_vars'(B, M, NB, LV, LV0, LEqs),
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'$localise_disj_vars'(B2, M, NB2, LV, LV0, LEqs).
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'$localise_disj_vars'(B2, M, NB, LV, LV0, LEqs) :-
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'$localise_vars'(B2, M, NB, LV, LV0, LEqs).
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'$localise_vars'((A->B), M, (A->NB), LV, LV0, LEqs) :-
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'$safe_guard'(A, M), !,
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'$variables_in_term'(A, LV, LV1),
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'$localise_vars'(B, M, NB, LV1, LV0, LEqs).
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'$localise_vars'((A;B), M, (NA;NB), LV1, LV0, LEqs) :- !,
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'$localise_vars'(A, M, NA, LV1, LV0, LEqs),
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'$localise_disj_vars'(B, M, NB, LV1, LV0, LEqs).
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'$localise_vars'(((A,B),C), M, NG, LV, LV0, LEqs) :- !,
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'$flatten_bd'((A,B),C,NB),
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'$localise_vars'(NB, M, NG, LV, LV0, LEqs).
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'$localise_vars'((!,B), M, (!,NB), LV, LV0, LEqs) :- !,
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'$localise_vars'(B, M, NB, LV, LV0, LEqs).
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'$localise_vars'((X=Y,B), M, (X=Y,NB1), LV, LV0, LEqs) :-
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var(X), var(Y), !,
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'$localise_vars'(B, M, NB1, LV, LV0, [X,Y|LEqs]).
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'$localise_vars'((G,B), M, (G,NB1), LV, LV0, LEqs) :-
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'$safe_builtin'(G, M), !,
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'$variables_in_term'(G, LV, LV1),
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'$add_extra_safe'(G, NLV0, LV0),
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'$localise_vars'(B, M, NB1, LV1, NLV0, LEqs).
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'$localise_vars'((G1,B1), _, O, LV, LV0, LEqs) :- !,
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terms:variables_within_term(LV, B1, Commons),
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terms:new_variables_in_term(LV, B1, New),
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copy_term(Commons+New+LEqs+B1, NCommons+NNew+NLEqs+NB1),
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NNew = New,
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NLEqs = LEqs,
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'$gen_equals'(Commons, NCommons, LV0, (G1,NB1), O).
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'$localise_vars'(G, _, G, _, _, _).
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'$flatten_bd'((A,B),R,NB) :- !,
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'$flatten_bd'(B,R,R1),
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'$flatten_bd'(A,R1,NB).
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'$flatten_bd'(A,R,(A,R)).
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% the idea here is to make global variables in disjunctions
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% local.
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'$localise_vars_opt'(H, M, (B1;B2), (NB1;NB2)) :-
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'$variables_in_term'(H, [], LV),
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'$localise_vars'(B1, M, NB1, LV, LV, []),
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'$localise_disj_vars'(B2, M, NB2, LV, LV, []).
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%, portray_clause((H:-BF))
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'$full_clause_optimisation'(H, M, B0, BF) :-
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'$localise_vars_opt'(H, M, B0, BF), !.
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%% @}
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