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-rw-r--r--src/proof/cec/cecSolve.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/proof/cec/cecSolve.c b/src/proof/cec/cecSolve.c
index 5e108ae5..41053cf0 100644
--- a/src/proof/cec/cecSolve.c
+++ b/src/proof/cec/cecSolve.c
@@ -383,8 +383,8 @@ void Cec_ManSatSolverRecycle( Cec_ManSat_t * p )
p->nSatVars = 1;
// p->nSatVars = 0;
Lit = toLitCond( p->nSatVars, 1 );
- if ( p->pPars->fPolarFlip )
- Lit = lit_neg( Lit );
+// if ( p->pPars->fPolarFlip ) // no need to normalize const0 node (bug fix by SS on 9/17/2012)
+// Lit = lit_neg( Lit );
sat_solver_addclause( p->pSat, &Lit, &Lit + 1 );
Cec_ObjSetSatNum( p, Gia_ManConst0(p->pAig), p->nSatVars++ );