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Diffstat (limited to 'src/aig/bdc/bdcDec.c')
| -rw-r--r-- | src/aig/bdc/bdcDec.c | 461 |
1 files changed, 0 insertions, 461 deletions
diff --git a/src/aig/bdc/bdcDec.c b/src/aig/bdc/bdcDec.c deleted file mode 100644 index 747fcb14..00000000 --- a/src/aig/bdc/bdcDec.c +++ /dev/null @@ -1,461 +0,0 @@ -/**CFile**************************************************************** - - FileName [bdcDec.c] - - SystemName [ABC: Logic synthesis and verification system.] - - PackageName [Truth-table-based bi-decomposition engine.] - - Synopsis [Decomposition procedures.] - - Author [Alan Mishchenko] - - Affiliation [UC Berkeley] - - Date [Ver. 1.0. Started - January 30, 2007.] - - Revision [$Id: bdcDec.c,v 1.00 2007/01/30 00:00:00 alanmi Exp $] - -***********************************************************************/ - -#include "bdcInt.h" - -//////////////////////////////////////////////////////////////////////// -/// DECLARATIONS /// -//////////////////////////////////////////////////////////////////////// - -static Bdc_Type_t Bdc_DecomposeStep( Bdc_Man_t * p, Bdc_Isf_t * pIsf, Bdc_Isf_t * pIsfL, Bdc_Isf_t * pIsfR ); -static int Bdc_DecomposeUpdateRight( Bdc_Man_t * p, Bdc_Isf_t * pIsf, Bdc_Isf_t * pIsfL, Bdc_Isf_t * pIsfR, unsigned * puTruth, Bdc_Type_t Type ); - -//////////////////////////////////////////////////////////////////////// -/// FUNCTION DEFINITIONS /// -//////////////////////////////////////////////////////////////////////// - -/**Function************************************************************* - - Synopsis [Performs one step of bi-decomposition.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -Bdc_Fun_t * Bdc_ManDecompose_rec( Bdc_Man_t * p, Bdc_Isf_t * pIsf ) -{ - Bdc_Fun_t * pFunc; - Bdc_Isf_t IsfL, * pIsfL = &IsfL; - Bdc_Isf_t IsfB, * pIsfR = &IsfB; - // check computed results - if ( pFunc = Bdc_TableLookup( p, pIsf ) ) - return pFunc; - // decide on the decomposition type - pFunc = Bdc_FunNew( p ); - if ( pFunc == NULL ) - return NULL; - pFunc->Type = Bdc_DecomposeStep( p, pIsf, pIsfL, pIsfR ); - // decompose the left branch - pFunc->pFan0 = Bdc_ManDecompose_rec( p, pIsfL ); - if ( pFunc->pFan0 == NULL ) - return NULL; - // decompose the right branch - if ( Bdc_DecomposeUpdateRight( p, pIsf, pIsfL, pIsfR, pFunc->pFan0->puFunc, pFunc->Type ) ) - { - p->nNodes--; - return pFunc->pFan0; - } - pFunc->pFan1 = Bdc_ManDecompose_rec( p, pIsfL ); - if ( pFunc->pFan1 == NULL ) - return NULL; - // compute the function of node - pFunc->puFunc = (unsigned *)Vec_IntFetch(p->vMemory, p->nWords); - if ( pFunc->Type == BDC_TYPE_AND ) - Kit_TruthAnd( pFunc->puFunc, pFunc->pFan0->puFunc, pFunc->pFan1->puFunc, p->nVars ); - else if ( pFunc->Type == BDC_TYPE_OR ) - Kit_TruthOr( pFunc->puFunc, pFunc->pFan0->puFunc, pFunc->pFan1->puFunc, p->nVars ); - else - assert( 0 ); - // verify correctness - assert( Bdc_TableCheckContainment(p, pIsf, pFunc->puFunc) ); - // convert from OR to AND - if ( pFunc->Type == BDC_TYPE_OR ) - { - pFunc->Type = BDC_TYPE_AND; - pFunc->pFan0 = Bdc_Not(pFunc->pFan0); - pFunc->pFan1 = Bdc_Not(pFunc->pFan1); - Kit_TruthNot( pFunc->puFunc, pFunc->puFunc, p->nVars ); - pFunc = Bdc_Not(pFunc); - } - Bdc_TableAdd( p, Bdc_Regular(pFunc) ); - return pFunc; -} - -/**Function************************************************************* - - Synopsis [Updates the ISF of the right after the left was decompoosed.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -int Bdc_DecomposeUpdateRight( Bdc_Man_t * p, Bdc_Isf_t * pIsf, Bdc_Isf_t * pIsfL, Bdc_Isf_t * pIsfR, unsigned * puTruth, Bdc_Type_t Type ) -{ - if ( Type == BDC_TYPE_OR ) - { -// Right.Q = bdd_appex( Q, CompSpecLeftF, bddop_diff, setRightRes ); -// Right.R = bdd_exist( R, setRightRes ); - -// if ( pR->Q ) Cudd_RecursiveDeref( dd, pR->Q ); -// if ( pR->R ) Cudd_RecursiveDeref( dd, pR->R ); -// pR->Q = Cudd_bddAndAbstract( dd, pF->Q, Cudd_Not(CompSpecF), pL->V ); Cudd_Ref( pR->Q ); -// pR->R = Cudd_bddExistAbstract( dd, pF->R, pL->V ); Cudd_Ref( pR->R ); - -// assert( pR->R != b0 ); -// return (int)( pR->Q == b0 ); - - Kit_TruthSharp( pIsfR->puOn, pIsf->puOn, puTruth, p->nVars ); - Kit_TruthExistSet( pIsfR->puOn, pIsfR->puOn, p->nVars, pIsfL->uSupp ); - Kit_TruthExistSet( pIsfR->puOff, pIsf->puOff, p->nVars, pIsfL->uSupp ); - assert( !Kit_TruthIsConst0(pIsfR->puOff, p->nVars) ); - return Kit_TruthIsConst0(pIsfR->puOn, p->nVars); - } - else if ( Type == BDC_TYPE_AND ) - { -// Right.R = bdd_appex( R, CompSpecLeftF, bddop_and, setRightRes ); -// Right.Q = bdd_exist( Q, setRightRes ); - -// if ( pR->Q ) Cudd_RecursiveDeref( dd, pR->Q ); -// if ( pR->R ) Cudd_RecursiveDeref( dd, pR->R ); -// pR->R = Cudd_bddAndAbstract( dd, pF->R, CompSpecF, pL->V ); Cudd_Ref( pR->R ); -// pR->Q = Cudd_bddExistAbstract( dd, pF->Q, pL->V ); Cudd_Ref( pR->Q ); - -// assert( pR->Q != b0 ); -// return (int)( pR->R == b0 ); - - Kit_TruthSharp( pIsfR->puOn, pIsf->puOn, puTruth, p->nVars ); - Kit_TruthExistSet( pIsfR->puOn, pIsfR->puOn, p->nVars, pIsfL->uSupp ); - Kit_TruthExistSet( pIsfR->puOff, pIsf->puOff, p->nVars, pIsfL->uSupp ); - assert( !Kit_TruthIsConst0(pIsfR->puOff, p->nVars) ); - return Kit_TruthIsConst0(pIsfR->puOn, p->nVars); - } - return 0; -} - -/**Function************************************************************* - - Synopsis [Checks existence of OR-bidecomposition.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -static inline int Bdc_DecomposeGetCost( Bdc_Man_t * p, int nLeftVars, int nRightVars ) -{ - assert( nLeftVars > 0 ); - assert( nRightVars > 0 ); - // compute the decomposition coefficient - if ( nLeftVars >= nRightVars ) - return BDC_SCALE * (p->nVars * nRightVars + nLeftVars); - else // if ( nLeftVars < nRightVars ) - return BDC_SCALE * (p->nVars * nLeftVars + nRightVars); -} - -/**Function************************************************************* - - Synopsis [Checks existence of weak OR-bidecomposition.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -int Bdc_DecomposeFindInitialVarSet( Bdc_Man_t * p, Bdc_Isf_t * pIsf, Bdc_Isf_t * pIsfL, Bdc_Isf_t * pIsfR ) -{ - char pVars[16]; - int v, nVars, Beg, End; - - assert( pIsfL->uSupp == 0 ); - assert( pIsfR->uSupp == 0 ); - - // fill in the variables - nVars = 0; - for ( v = 0; v < p->nVars; v++ ) - if ( pIsf->uSupp & (1 << v) ) - pVars[nVars++] = v; - - // try variable pairs - for ( Beg = 0; Beg < nVars; Beg++ ) - { - Kit_TruthExistNew( p->puTemp1, pIsf->puOff, p->nVars, pVars[Beg] ); - for ( End = nVars - 1; End > Beg; End-- ) - { - Kit_TruthExistNew( p->puTemp2, pIsf->puOff, p->nVars, pVars[End] ); - if ( Kit_TruthIsDisjoint3(pIsf->puOn, p->puTemp1, p->puTemp2, p->nVars) ) - { - pIsfL->uSupp = (1 << Beg); - pIsfR->uSupp = (1 << End); - pIsfL->Var = Beg; - pIsfR->Var = End; - return 1; - } - } - } - return 0; -} - -/**Function************************************************************* - - Synopsis [Checks existence of weak OR-bidecomposition.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -int Bdc_DecomposeWeakOr( Bdc_Man_t * p, Bdc_Isf_t * pIsf, Bdc_Isf_t * pIsfL, Bdc_Isf_t * pIsfR ) -{ - int v, VarCost, VarBest, Cost, VarCostBest = 0; - - for ( v = 0; v < p->nVars; v++ ) - { - Kit_TruthExistNew( p->puTemp1, pIsf->puOff, p->nVars, v ); -// if ( (Q & !bdd_exist( R, VarSetXa )) != bddfalse ) -// Exist = Cudd_bddExistAbstract( dd, pF->R, Var ); Cudd_Ref( Exist ); -// if ( Cudd_bddIteConstant( dd, pF->Q, Cudd_Not(Exist), b0 ) != b0 ) - if ( !Kit_TruthIsImply( pIsf->puOn, p->puTemp1, p->nVars ) ) - { - // measure the cost of this variable -// VarCost = bdd_satcountset( bdd_forall( Q, VarSetXa ), VarCube ); - -// Univ = Cudd_bddUnivAbstract( dd, pF->Q, Var ); Cudd_Ref( Univ ); -// VarCost = Kit_TruthCountOnes( Univ, p->nVars ); -// Cudd_RecursiveDeref( dd, Univ ); - - Kit_TruthForallNew( p->puTemp2, pIsf->puOn, p->nVars, v ); - VarCost = Kit_TruthCountOnes( p->puTemp2, p->nVars ); - if ( VarCost == 0 ) - VarCost = 1; - if ( VarCostBest < VarCost ) - { - VarCostBest = VarCost; - VarBest = v; - } - } - } - - // derive the components for weak-bi-decomposition if the variable is found - if ( VarCostBest ) - { -// funQLeftRes = Q & bdd_exist( R, setRightORweak ); - -// Temp = Cudd_bddExistAbstract( dd, pF->R, VarBest ); Cudd_Ref( Temp ); -// pL->Q = Cudd_bddAnd( dd, pF->Q, Temp ); Cudd_Ref( pL->Q ); -// Cudd_RecursiveDeref( dd, Temp ); - - Kit_TruthExistNew( p->puTemp1, pIsf->puOff, p->nVars, VarBest ); - Kit_TruthAnd( pIsfL->puOn, pIsf->puOn, p->puTemp1, p->nVars ); - -// pL->R = pF->R; Cudd_Ref( pL->R ); -// pL->V = VarBest; Cudd_Ref( pL->V ); - Kit_TruthCopy( pIsfL->puOff, pIsf->puOff, p->nVars ); - pIsfL->Var = VarBest; - -// assert( pL->Q != b0 ); -// assert( pL->R != b0 ); -// assert( Cudd_bddIteConstant( dd, pL->Q, pL->R, b0 ) == b0 ); - - // express cost in percents of the covered boolean space - Cost = VarCostBest * BDC_SCALE / (1<<p->nVars); - if ( Cost == 0 ) - Cost = 1; - return Cost; - } - return 0; -} - -/**Function************************************************************* - - Synopsis [Checks existence of OR-bidecomposition.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -int Bdc_DecomposeOr( Bdc_Man_t * p, Bdc_Isf_t * pIsf, Bdc_Isf_t * pIsfL, Bdc_Isf_t * pIsfR ) -{ - unsigned uSuppRem; - int v, nLeftVars = 1, nRightVars = 1; - // clean the var sets - Bdc_IsfClean( pIsfL ); - Bdc_IsfClean( pIsfR ); - // find initial variable sets - if ( !Bdc_DecomposeFindInitialVarSet( p, pIsf, pIsfL, pIsfR ) ) - return Bdc_DecomposeWeakOr( p, pIsf, pIsfL, pIsfR ); - // prequantify the variables in the offset - Kit_TruthExistNew( p->puTemp1, pIsf->puOff, p->nVars, pIsfL->Var ); - Kit_TruthExistNew( p->puTemp2, pIsf->puOff, p->nVars, pIsfR->Var ); - // go through the remaining variables - uSuppRem = pIsf->uSupp & ~pIsfL->uSupp & ~pIsfR->uSupp; - assert( Kit_WordCountOnes(uSuppRem) > 0 ); - for ( v = 0; v < p->nVars; v++ ) - { - if ( (uSuppRem & (1 << v)) == 0 ) - continue; - // prequantify this variable - Kit_TruthExistNew( p->puTemp3, p->puTemp1, p->nVars, v ); - Kit_TruthExistNew( p->puTemp4, p->puTemp2, p->nVars, v ); - if ( nLeftVars < nRightVars ) - { -// if ( (Q & bdd_exist( pF->R, pL->V & VarNew ) & bdd_exist( pF->R, pR->V )) == bddfalse ) -// if ( VerifyORCondition( dd, pF->Q, pF->R, pL->V, pR->V, VarNew ) ) - if ( Kit_TruthIsDisjoint3(pIsf->puOn, p->puTemp3, p->puTemp2, p->nVars) ) - { -// pL->V &= VarNew; - pIsfL->uSupp |= (1 << v); - nLeftVars++; - } -// else if ( (Q & bdd_exist( pF->R, pR->V & VarNew ) & bdd_exist( pF->R, pL->V )) == bddfalse ) - else if ( Kit_TruthIsDisjoint3(pIsf->puOn, p->puTemp4, p->puTemp1, p->nVars) ) - { -// pR->V &= VarNew; - pIsfR->uSupp |= (1 << v); - nRightVars++; - } - } - else - { -// if ( (Q & bdd_exist( pF->R, pR->V & VarNew ) & bdd_exist( pF->R, pL->V )) == bddfalse ) - if ( Kit_TruthIsDisjoint3(pIsf->puOn, p->puTemp4, p->puTemp1, p->nVars) ) - { -// pR->V &= VarNew; - pIsfR->uSupp |= (1 << v); - nRightVars++; - } -// else if ( (Q & bdd_exist( pF->R, pL->V & VarNew ) & bdd_exist( pF->R, pR->V )) == bddfalse ) - else if ( Kit_TruthIsDisjoint3(pIsf->puOn, p->puTemp3, p->puTemp2, p->nVars) ) - { -// pL->V &= VarNew; - pIsfL->uSupp |= (1 << v); - nLeftVars++; - } - } - } - - // derive the functions Q and R for the left branch -// pL->Q = bdd_appex( pF->Q, bdd_exist( pF->R, pL->V ), bddop_and, pR->V ); -// pL->R = bdd_exist( pF->R, pR->V ); - -// Temp = Cudd_bddExistAbstract( dd, pF->R, pL->V ); Cudd_Ref( Temp ); -// pL->Q = Cudd_bddAndAbstract( dd, pF->Q, Temp, pR->V ); Cudd_Ref( pL->Q ); -// Cudd_RecursiveDeref( dd, Temp ); -// pL->R = Cudd_bddExistAbstract( dd, pF->R, pR->V ); Cudd_Ref( pL->R ); - - Kit_TruthAnd( pIsfL->puOn, pIsf->puOn, p->puTemp1, p->nVars ); - Kit_TruthExistSet( pIsfL->puOn, pIsfL->puOn, p->nVars, pIsfR->uSupp ); - Kit_TruthCopy( pIsfL->puOff, p->puTemp2, p->nVars ); - - // derive the functions Q and R for the right branch -// Temp = Cudd_bddExistAbstract( dd, pF->R, pR->V ); Cudd_Ref( Temp ); -// pR->Q = Cudd_bddAndAbstract( dd, pF->Q, Temp, pL->V ); Cudd_Ref( pR->Q ); -// Cudd_RecursiveDeref( dd, Temp ); -// pR->R = Cudd_bddExistAbstract( dd, pF->R, pL->V ); Cudd_Ref( pR->R ); - -/* - Kit_TruthAnd( pIsfR->puOn, pIsf->puOn, p->puTemp2, p->nVars ); - Kit_TruthExistSet( pIsfR->puOn, pIsfR->puOn, p->nVars, pIsfL->uSupp ); - Kit_TruthCopy( pIsfR->puOff, p->puTemp1, p->nVars ); -*/ - -// assert( pL->Q != b0 ); -// assert( pL->R != b0 ); -// assert( Cudd_bddIteConstant( dd, pL->Q, pL->R, b0 ) == b0 ); - assert( !Kit_TruthIsConst0(pIsfL->puOn, p->nVars) ); - assert( !Kit_TruthIsConst0(pIsfL->puOff, p->nVars) ); - assert( Kit_TruthIsDisjoint(pIsfL->puOn, pIsfL->puOff, p->nVars) ); - - return Bdc_DecomposeGetCost( p, nLeftVars, nRightVars ); -} - -/**Function************************************************************* - - Synopsis [Performs one step of bi-decomposition.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -Bdc_Type_t Bdc_DecomposeStep( Bdc_Man_t * p, Bdc_Isf_t * pIsf, Bdc_Isf_t * pIsfL, Bdc_Isf_t * pIsfR ) -{ - int CostOr, CostAnd, CostOrL, CostOrR, CostAndL, CostAndR; - - Bdc_IsfClean( p->pIsfOL ); - Bdc_IsfClean( p->pIsfOR ); - Bdc_IsfClean( p->pIsfAL ); - Bdc_IsfClean( p->pIsfAR ); - - // perform OR decomposition - CostOr = Bdc_DecomposeOr( p, pIsf, p->pIsfOL, p->pIsfOR ); - - // perform AND decomposition - Bdc_IsfNot( pIsf ); - CostAnd = Bdc_DecomposeOr( p, pIsf, p->pIsfAL, p->pIsfAR ); - Bdc_IsfNot( pIsf ); - Bdc_IsfNot( p->pIsfAL ); - Bdc_IsfNot( p->pIsfAR ); - - // check the hash table - Bdc_SuppMinimize( p, p->pIsfOL ); - CostOrL = (Bdc_TableLookup(p, p->pIsfOL) != NULL); - Bdc_SuppMinimize( p, p->pIsfOR ); - CostOrR = (Bdc_TableLookup(p, p->pIsfOR) != NULL); - Bdc_SuppMinimize( p, p->pIsfAL ); - CostAndL = (Bdc_TableLookup(p, p->pIsfAL) != NULL); - Bdc_SuppMinimize( p, p->pIsfAR ); - CostAndR = (Bdc_TableLookup(p, p->pIsfAR) != NULL); - - // check if there is any reuse for the components - if ( CostOrL + CostOrR < CostAndL + CostAndR ) - { - Bdc_IsfCopy( pIsfL, p->pIsfOL ); - Bdc_IsfCopy( pIsfR, p->pIsfOR ); - return BDC_TYPE_OR; - } - if ( CostOrL + CostOrR > CostAndL + CostAndR ) - { - Bdc_IsfCopy( pIsfL, p->pIsfAL ); - Bdc_IsfCopy( pIsfR, p->pIsfAR ); - return BDC_TYPE_AND; - } - - // compare the two-component costs - if ( CostOr < CostAnd ) - { - Bdc_IsfCopy( pIsfL, p->pIsfOL ); - Bdc_IsfCopy( pIsfR, p->pIsfOR ); - return BDC_TYPE_OR; - } - return BDC_TYPE_AND; -} - -//////////////////////////////////////////////////////////////////////// -/// END OF FILE /// -//////////////////////////////////////////////////////////////////////// - - |