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Small improvement for mod in CLP(Z)

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notoria
2021-03-07 18:38:04 +01:00
parent fa025bcf39
commit f6d4821a68
2 changed files with 19 additions and 13 deletions
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31
src/lib/clpz.pl
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@@ -4972,19 +4972,24 @@ run_propagator(pmod(X,Y,Z), MState) -->
)
; Z =:= 0 % Multiple solutions so do nothing special.
),
( Z > 0 ->
{ fd_get(Y, YD, YPs),
YMin is Z + 1,
domain_remove_smaller_than(YD, YMin, YD1) },
fd_put(Y, YD1, YPs)
% queue_goal(Y #> Z)
; Z < 0 ->
{ fd_get(Y, YD, YPs),
YMax is Z - 1,
domain_remove_greater_than(YD, YMax, YD1) },
fd_put(Y, YD1, YPs)
% queue_goal(Y #< Z)
; true
( { fd_get(Y, _, _, n(YU), _),
YU < X, X =< 0 } -> kill(MState), Z =:= X
; { fd_get(Y, _, n(YL), _, _),
YL > X, X >= 0 } -> kill(MState), Z =:= X
; ( Z > 0 ->
{ fd_get(Y, YD, YPs),
YMin is Z + 1,
domain_remove_smaller_than(YD, YMin, YD1) },
fd_put(Y, YD1, YPs)
% queue_goal(Y #> Z)
; Z < 0 ->
{ fd_get(Y, YD, YPs),
YMax is Z - 1,
domain_remove_greater_than(YD, YMax, YD1) },
fd_put(Y, YD1, YPs)
% queue_goal(Y #< Z)
; true
)
)
; run_propagator(pmodz(X,Y,Z), MState),
run_propagator(pmody(X,Y,Z), MState),