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