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Commit c3ab7843 by Alan Mishchenko
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Backward reachability using circuit cofactoring.

parent 99cc6ae9
Showing with 12 additions and 13 deletions
src/aig/gia/giaCCof.c
......@@ -149,19 +149,21 @@ static inline int Gia_Obj1Copy( Vec_Int_t * vCopies, Gia_Man_t * pGia, Gia_Obj_t
SeeAlso []
***********************************************************************/
void Gia_ManCofOneDerive_rec( Ccf_Man_t * p, Gia_Obj_t * pObj )
void Gia_ManCofOneDerive_rec( Ccf_Man_t * p, int Id )
{
int Res, Id = Gia_ObjId( p->pFrames, pObj );
Gia_Obj_t * pObj;
int Res;
if ( Vec_IntEntry(p->vCopies, Id) != -1 )
return;
pObj = Gia_ManObj(p->pFrames, Id);
assert( Gia_ObjIsCi(pObj) || Gia_ObjIsAnd(pObj) );
if ( Gia_ObjIsAnd(pObj) )
{
Gia_ManCofOneDerive_rec( p, Gia_ObjFanin0(pObj) );
Gia_ManCofOneDerive_rec( p, Gia_ObjFanin1(pObj) );
Gia_ManCofOneDerive_rec( p, Gia_ObjFaninId0p(p->pFrames, Gia_ManObj(p->pFrames, Id)) );
Gia_ManCofOneDerive_rec( p, Gia_ObjFaninId1p(p->pFrames, Gia_ManObj(p->pFrames, Id)) );
Res = Gia_ManHashAnd( p->pFrames,
Gia_Obj0Copy(p->vCopies, p->pFrames, pObj),
Gia_Obj1Copy(p->vCopies, p->pFrames, pObj) );
Gia_Obj0Copy(p->vCopies, p->pFrames, Gia_ManObj(p->pFrames, Id)),
Gia_Obj1Copy(p->vCopies, p->pFrames, Gia_ManObj(p->pFrames, Id)) );
}
else if ( Gia_ObjCioId(pObj) >= Gia_ManRegNum(p->pGia) ) // PI
Res = sat_solver_var_value( p->pSat, Id );
......@@ -183,15 +185,12 @@ void Gia_ManCofOneDerive_rec( Ccf_Man_t * p, Gia_Obj_t * pObj )
***********************************************************************/
int Gia_ManCofOneDerive( Ccf_Man_t * p, int LitProp )
{
Gia_Obj_t * pObj;
int LitOut;
// get the property node
pObj = Gia_ManObj( p->pFrames, Gia_Lit2Var(LitProp) );
// derive the cofactor
// derive the cofactor of the property node
Vec_IntFill( p->vCopies, Gia_ManObjNum(p->pFrames), -1 );
Gia_ManCofOneDerive_rec( p, pObj );
LitOut = Vec_IntEntry(p->vCopies, Gia_Lit2Var(LitProp));
LitOut = Gia_LitNotCond(LitOut, Gia_LitIsCompl(LitProp));
Gia_ManCofOneDerive_rec( p, Gia_Lit2Var(LitProp) );
LitOut = Vec_IntEntry( p->vCopies, Gia_Lit2Var(LitProp) );
LitOut = Gia_LitNotCond( LitOut, Gia_LitIsCompl(LitProp) );
// add new PO for the cofactor
Gia_ManAppendCo( p->pFrames, LitOut );
// add SAT clauses
......
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