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* src/tgba/tgbabddconcretefactory.cc:

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(tgba_bdd_concrete_factory::tgba_bdd_concrete_factory): New.
(tgba_bdd_concrete_factory::create_state): Update now_to_next_.
(tgba_bdd_concrete_factory::finish): Constraint Next variables
in the relation.
* src/tgba/tgbabddconcretefactory.hh
(tgba_bdd_concrete_factory::now_to_next_): New variable.
This commit is contained in:
Alexandre Duret-Lutz 2003-06-30 08:15:06 +00:00
parent cf136e84bd
commit 12f66a3b18
3 changed files with 18 additions and 3 deletions
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15
src/tgba/tgbabddconcretefactory.cc
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@ -3,6 +3,11 @@
#include "tgbabddconcretefactory.hh" #include "tgbabddconcretefactory.hh"
namespace spot namespace spot
{ {
tgba_bdd_concrete_factory::tgba_bdd_concrete_factory()
: now_to_next_(bdd_newpair())
{
}
tgba_bdd_concrete_factory::~tgba_bdd_concrete_factory() tgba_bdd_concrete_factory::~tgba_bdd_concrete_factory()
{ {
acc_map_::iterator ai; acc_map_::iterator ai;
@ -27,6 +32,7 @@ namespace spot
// Record that num+1 should be renamed as num when // Record that num+1 should be renamed as num when
// the next state becomes current. // the next state becomes current.
bdd_setpair(data_.next_to_now, num + 1, num); bdd_setpair(data_.next_to_now, num + 1, num);
bdd_setpair(now_to_next_, num, num + 1);
// Keep track of all "Now" variables for easy // Keep track of all "Now" variables for easy
// existential quantification. // existential quantification.
@ -100,6 +106,15 @@ namespace spot
// of this accepting set. // of this accepting set.
data_.accepting_conditions |= ai->second & acc; data_.accepting_conditions |= ai->second & acc;
} }
// Any constraint between Now variables also exist between Next
// variables. Doing this limits the quantity of useless
// successors we will have to explore. (By "useless successors"
// I mean a combination of Next variables that represent a cul de sac
// state: the combination exists but won't allow further exploration
// because it fails the constraints.)
data_.relation &= bdd_replace(bdd_exist(data_.relation, data_.notnow_set),
now_to_next_);
} }
const tgba_bdd_core_data& const tgba_bdd_core_data&