diff options
Diffstat (limited to 'src/sat/fraig/fraigSat.c')
| -rw-r--r-- | src/sat/fraig/fraigSat.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/src/sat/fraig/fraigSat.c b/src/sat/fraig/fraigSat.c index da9e8e2b..17201e58 100644 --- a/src/sat/fraig/fraigSat.c +++ b/src/sat/fraig/fraigSat.c @@ -122,11 +122,23 @@ void Fraig_ManProveMiter( Fraig_Man_t * p ) ***********************************************************************/ int Fraig_ManCheckMiter( Fraig_Man_t * p ) { - if ( p->vOutputs->pArray[0] == Fraig_Not(p->pConst1) ) + Fraig_Node_t * pNode; + FREE( p->pModel ); + // get the output node (it can be complemented!) + pNode = p->vOutputs->pArray[0]; + // if the miter is constant 0, the problem is UNSAT + if ( pNode == Fraig_Not(p->pConst1) ) return 1; + // consider the special case when the miter is constant 1 + if ( pNode == p->pConst1 ) + { + // in this case, any counter example will do to distinquish it from constant 0 + // here we pick the counter example composed of all zeros + p->pModel = Fraig_ManAllocCounterExample( p ); + return 0; + } // save the counter example - FREE( p->pModel ); - p->pModel = Fraig_ManSaveCounterExample( p, Fraig_Regular(p->vOutputs->pArray[0]) ); + p->pModel = Fraig_ManSaveCounterExample( p, pNode ); // if the model is not found, return undecided if ( p->pModel == NULL ) return -1; |