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Diffstat (limited to 'src/sat/msat/msatActivity.c')
-rw-r--r-- | src/sat/msat/msatActivity.c | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/src/sat/msat/msatActivity.c b/src/sat/msat/msatActivity.c new file mode 100644 index 00000000..1cd795bd --- /dev/null +++ b/src/sat/msat/msatActivity.c @@ -0,0 +1,160 @@ +/**CFile**************************************************************** + + FileName [msatActivity.c] + + PackageName [A C version of SAT solver MINISAT, originally developed + in C++ by Niklas Een and Niklas Sorensson, Chalmers University of + Technology, Sweden: http://www.cs.chalmers.se/~een/Satzoo.] + + Synopsis [Procedures controlling activity of variables and clauses.] + + Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>] + + Affiliation [UC Berkeley] + + Date [Ver. 1.0. Started - January 1, 2004.] + + Revision [$Id: msatActivity.c,v 1.0 2004/01/01 1:00:00 alanmi Exp $] + +***********************************************************************/ + +#include "msatInt.h" + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_SolverVarBumpActivity( Msat_Solver_t * p, Msat_Lit_t Lit ) +{ + Msat_Var_t Var; + if ( p->dVarDecay < 0 ) // (negative decay means static variable order -- don't bump) + return; + Var = MSAT_LIT2VAR(Lit); + p->pdActivity[Var] += p->dVarInc; +// p->pdActivity[Var] += p->dVarInc * p->pFactors[Var]; + if ( p->pdActivity[Var] > 1e100 ) + Msat_SolverVarRescaleActivity( p ); + Msat_OrderUpdate( p->pOrder, Var ); +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_SolverVarDecayActivity( Msat_Solver_t * p ) +{ + if ( p->dVarDecay >= 0 ) + p->dVarInc *= p->dVarDecay; +} + +/**Function************************************************************* + + Synopsis [Divide all variable activities by 1e100.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_SolverVarRescaleActivity( Msat_Solver_t * p ) +{ + int i; + for ( i = 0; i < p->nVars; i++ ) + p->pdActivity[i] *= 1e-100; + p->dVarInc *= 1e-100; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_SolverClaBumpActivity( Msat_Solver_t * p, Msat_Clause_t * pC ) +{ + float Activ; + Activ = Msat_ClauseReadActivity(pC); + if ( Activ + p->dClaInc > 1e20 ) + { + Msat_SolverClaRescaleActivity( p ); + Activ = Msat_ClauseReadActivity( pC ); + } + Msat_ClauseWriteActivity( pC, Activ + (float)p->dClaInc ); +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_SolverClaDecayActivity( Msat_Solver_t * p ) +{ + p->dClaInc *= p->dClaDecay; +} + +/**Function************************************************************* + + Synopsis [Divide all constraint activities by 1e20.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_SolverClaRescaleActivity( Msat_Solver_t * p ) +{ + Msat_Clause_t ** pLearned; + int nLearned, i; + float Activ; + nLearned = Msat_ClauseVecReadSize( p->vLearned ); + pLearned = Msat_ClauseVecReadArray( p->vLearned ); + for ( i = 0; i < nLearned; i++ ) + { + Activ = Msat_ClauseReadActivity( pLearned[i] ); + Msat_ClauseWriteActivity( pLearned[i], Activ * (float)1e-20 ); + } + p->dClaInc *= 1e-20; +} + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + + |