diff options
Diffstat (limited to 'src/base/acb')
-rw-r--r-- | src/base/acb/acb.h | 53 | ||||
-rw-r--r-- | src/base/acb/acbMfs.c | 12 | ||||
-rw-r--r-- | src/base/acb/acbPush.c | 310 |
3 files changed, 326 insertions, 49 deletions
diff --git a/src/base/acb/acb.h b/src/base/acb/acb.h index 7c228acb..baecd161 100644 --- a/src/base/acb/acb.h +++ b/src/base/acb/acb.h @@ -256,7 +256,8 @@ static inline int * Acb_ObjFanins( Acb_Ntk_t * p, int i ) static inline int Acb_ObjFanin( Acb_Ntk_t * p, int i, int k ) { return Acb_ObjFanins(p, i)[k+1]; } static inline int Acb_ObjFaninNum( Acb_Ntk_t * p, int i ) { return Acb_ObjFanins(p, i)[0]; } static inline int Acb_ObjFanoutNum( Acb_Ntk_t * p, int i ) { return Vec_IntSize( Vec_WecEntry(&p->vFanouts, i) ); } -static inline Vec_Int_t * Acb_ObjFanoutVec( Acb_Ntk_t * p, int i ) { return Vec_WecEntry( &p->vFanouts, i ); } +static inline Vec_Int_t * Acb_ObjFanoutVec( Acb_Ntk_t * p, int i ) { assert(i>0); return Vec_WecEntry( &p->vFanouts, i ); } +static inline int Acb_ObjFanout( Acb_Ntk_t * p, int i, int k ) { return Vec_IntEntry( Acb_ObjFanoutVec(p, i), k ); } static inline int Acb_ObjFanin0( Acb_Ntk_t * p, int i ) { return Acb_ObjFanins(p, i)[1]; } static inline int Acb_ObjCioId( Acb_Ntk_t * p, int i ) { return Acb_ObjFanins(p, i)[2]; } @@ -276,7 +277,6 @@ static inline int Acb_ObjLevelR( Acb_Ntk_t * p, int i ) static inline int Acb_ObjPathD( Acb_Ntk_t * p, int i ) { assert(i>0); return Vec_IntEntry(&p->vPathD, i); } static inline int Acb_ObjPathR( Acb_Ntk_t * p, int i ) { assert(i>0); return Vec_IntEntry(&p->vPathR, i); } static inline float Acb_ObjCounts( Acb_Ntk_t * p, int i ) { assert(i>0); return Vec_FltEntry(&p->vCounts, i); } -static inline Vec_Int_t * Acb_ObjFanout( Acb_Ntk_t * p, int i ) { assert(i>0); return Vec_WecEntry(&p->vFanouts, i); } static inline Vec_Str_t * Acb_ObjCnfs( Acb_Ntk_t * p, int i ) { assert(i>0); return (Vec_Str_t *)Vec_WecEntry(&p->vCnfs, i); } static inline void Acb_ObjSetCopy( Acb_Ntk_t * p, int i, int x ) { assert(Acb_ObjCopy(p, i) == -1); Vec_IntWriteEntry( &p->vObjCopy, i, x ); } @@ -361,6 +361,8 @@ static inline void Acb_NtkIncTravId( Acb_Ntk_t * p ) for ( i = Vec_StrSize(&p->vObjType)-1; i > 0; i-- ) if ( !Acb_ObjType(p, i) ) {} else #define Acb_NtkForEachNode( p, i ) \ for ( i = 1; i < Vec_StrSize(&p->vObjType); i++ ) if ( !Acb_ObjType(p, i) || Acb_ObjIsCio(p, i) ) {} else +#define Acb_NtkForEachNodeSupp( p, i, nSuppSize ) \ + for ( i = 1; i < Vec_StrSize(&p->vObjType); i++ ) if ( !Acb_ObjType(p, i) || Acb_ObjIsCio(p, i) || Acb_ObjFaninNum(p, i) != nSuppSize ) {} else #define Acb_NtkForEachNodeReverse( p, i ) \ for ( i = Vec_StrSize(&p->vObjType)-1; i > 0; i-- ) if ( !Acb_ObjType(p, i) || Acb_ObjIsCio(p, i) ) {} else #define Acb_NtkForEachObjType( p, Type, i ) \ @@ -403,12 +405,35 @@ static inline int Acb_ObjFonNum( Acb_Ntk_t * p, int iObj ) Count++; return Count; } +static inline int Acb_ObjWhatFanin( Acb_Ntk_t * p, int iObj, int iFaninGiven ) +{ + int k, iFanin, * pFanins; + Acb_ObjForEachFaninFast( p, iObj, pFanins, iFanin, k ) + if ( iFanin == iFaninGiven ) + return k; + return -1; +} static inline void Acb_ObjAddFanin( Acb_Ntk_t * p, int iObj, int iFanin ) { int * pFanins = Acb_ObjFanins( p, iObj ); assert( pFanins[ 1 + pFanins[0] ] == -1 ); pFanins[ 1 + pFanins[0]++ ] = iFanin; } +static inline void Acb_ObjDeleteFaninIndex( Acb_Ntk_t * p, int iObj, int iFaninIndex ) +{ + int i, * pFanins = Acb_ObjFanins( p, iObj ); + pFanins[0]--; + for ( i = iFaninIndex; i < pFanins[0]; i++ ) + pFanins[ 1 + i ] = pFanins[ 2 + i ]; + pFanins[ 1 + pFanins[0] ] = -1; +} +static inline void Acb_ObjDeleteFanin( Acb_Ntk_t * p, int iObj, int iFanin ) +{ + int * pFanins = Acb_ObjFanins( p, iObj ); + int iFaninIndex = Acb_ObjWhatFanin( p, iObj, iFanin ); + assert( pFanins[ 1 + iFaninIndex ] == iFanin ); + Acb_ObjDeleteFaninIndex( p, iObj, iFaninIndex ); +} static inline void Acb_ObjAddFanins( Acb_Ntk_t * p, int iObj, Vec_Int_t * vFanins ) { int i, iFanin; @@ -495,12 +520,23 @@ static inline void Acb_ObjDelete( Acb_Ntk_t * p, int iObj ) Acb_ObjForEachFon( p, iObj, i ) Acb_ObjCleanType( p, i ); } +static inline void Acb_ObjAddFaninFanoutOne( Acb_Ntk_t * p, int iObj, int iFanin ) +{ + Vec_IntPush( Vec_WecEntry(&p->vFanouts, iFanin), iObj ); + Acb_ObjAddFanin( p, iObj, iFanin ); +} static inline void Acb_ObjAddFaninFanout( Acb_Ntk_t * p, int iObj ) { int k, iFanin, * pFanins; Acb_ObjForEachFaninFast( p, iObj, pFanins, iFanin, k ) Vec_IntPush( Vec_WecEntry(&p->vFanouts, iFanin), iObj ); } +static inline void Acb_ObjRemoveFaninFanoutOne( Acb_Ntk_t * p, int iObj, int iFanin ) +{ + int RetValue = Vec_IntRemove( Vec_WecEntry(&p->vFanouts, iFanin), iObj ); + assert( RetValue ); + Acb_ObjDeleteFanin( p, iObj, iFanin ); +} static inline void Acb_ObjRemoveFaninFanout( Acb_Ntk_t * p, int iObj ) { int k, iFanin, * pFanins; @@ -510,6 +546,19 @@ static inline void Acb_ObjRemoveFaninFanout( Acb_Ntk_t * p, int iObj ) assert( RetValue ); } } +static inline void Acb_ObjPatchFanin( Acb_Ntk_t * p, int iObj, int iFanin, int iFaninNew ) +{ + int i, RetValue, * pFanins = Acb_ObjFanins( p, iObj ); + assert( iFanin != iFaninNew ); + for ( i = 0; i < pFanins[0]; i++ ) + if ( pFanins[ 1 + i ] == iFanin ) + pFanins[ 1 + i ] = iFaninNew; + if ( !Acb_NtkHasObjFanout(p) ) + return; + RetValue = Vec_IntRemove( Vec_WecEntry(&p->vFanouts, iFanin), iObj ); + assert( RetValue ); + Vec_IntPush( Vec_WecEntry(&p->vFanouts, iFaninNew), iObj ); +} static inline void Acb_NtkCreateFanout( Acb_Ntk_t * p ) { int iObj; diff --git a/src/base/acb/acbMfs.c b/src/base/acb/acbMfs.c index d8c6fb16..9fce00f8 100644 --- a/src/base/acb/acbMfs.c +++ b/src/base/acb/acbMfs.c @@ -1576,7 +1576,7 @@ cleanup: void Acb_NtkOpt( Acb_Ntk_t * pNtk, Acb_Par_t * pPars ) { Acb_Mfs_t * pMan = Acb_MfsStart( pNtk, pPars ); - //if ( pPars->fVerbose ) + if ( pPars->fVerbose ) printf( "%s-optimization parameters: TfiLev(I) = %d TfoLev(O) = %d WinMax(W) = %d LutSize = %d\n", pMan->pPars->fArea ? "Area" : "Delay", pMan->pPars->nTfiLevMax, pMan->pPars->nTfoLevMax, pMan->pPars->nWinNodeMax, pMan->pPars->nLutSize ); Acb_NtkCreateFanout( pNtk ); // fanout data structure @@ -1592,8 +1592,8 @@ void Acb_NtkOpt( Acb_Ntk_t * pNtk, Acb_Par_t * pPars ) if ( iObj < nNodes && !Vec_BitEntry(vVisited, iObj) && Acb_NtkObjMffcEstimate(pNtk, iObj) >= n ) { pMan->nNodes++; - if ( iObj != 103 ) - continue; + //if ( iObj != 103 ) + // continue; //Acb_NtkOptNode( pMan, iObj ); while ( (RetValue = Acb_NtkOptNode(pMan, iObj)) && Acb_ObjFaninNum(pNtk, iObj) ); Vec_BitWriteEntry( vVisited, iObj, 1 ); @@ -1609,13 +1609,13 @@ void Acb_NtkOpt( Acb_Ntk_t * pNtk, Acb_Par_t * pPars ) int iObj = Vec_QuePop(pNtk->vQue); if ( !Acb_ObjType(pNtk, iObj) ) continue; - if ( iObj != 103 ) - continue; + //if ( iObj != 103 ) + // continue; //printf( "Trying node %4d (%4d) ", iObj, Value ); Acb_NtkOptNode( pMan, iObj ); } } - //if ( pPars->fVerbose ) + if ( pPars->fVerbose ) { pMan->timeTotal = Abc_Clock() - pMan->timeTotal; printf( "Node = %d Win = %d (Ave = %d) DivAve = %d Change = %d C = %d N1 = %d N2 = %d N3 = %d Over = %d Str = %d 2Node = %d.\n", diff --git a/src/base/acb/acbPush.c b/src/base/acb/acbPush.c index 08edc4d1..7ede912f 100644 --- a/src/base/acb/acbPush.c +++ b/src/base/acb/acbPush.c @@ -33,7 +33,105 @@ ABC_NAMESPACE_IMPL_START /**Function************************************************************* - Synopsis [Check if the node can have its logic pushed.] + Synopsis [Pushing logic to the fanout.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Acb_ObjPushToFanout( Acb_Ntk_t * p, int iObj, int iFaninIndex, int iFanout ) +{ + word c0, uTruthObjNew, uTruthObj = Acb_ObjTruth( p, iObj ), Gate; + word c1, uTruthFanNew, uTruthFan = Acb_ObjTruth( p, iFanout ); + int DecType = Abc_TtCheckOutAnd( uTruthObj, iFaninIndex, &uTruthObjNew ); + int iFanin = Acb_ObjFanin( p, iObj, iFaninIndex ); + int iFanoutObjIndex = Acb_ObjWhatFanin( p, iFanout, iObj ); + int iFanoutFaninIndex = Acb_ObjWhatFanin( p, iFanout, iFanin ); + if ( iFanoutFaninIndex == -1 ) + iFanoutFaninIndex = Acb_ObjFaninNum(p, iFanout); + assert( !Acb_ObjIsCio(p, iObj) ); + assert( !Acb_ObjIsCio(p, iFanout) ); + assert( iFanoutFaninIndex >= 0 ); + assert( iFaninIndex < Acb_ObjFaninNum(p, iObj) ); + assert( Acb_ObjFanoutNum(p, iObj) == 1 ); + // compute new function of the fanout + c0 = Abc_Tt6Cofactor0( uTruthFan, iFanoutObjIndex ); + c1 = Abc_Tt6Cofactor1( uTruthFan, iFanoutObjIndex ); + if ( DecType == 0 ) // F = i * G + Gate = s_Truths6[iFanoutFaninIndex] & s_Truths6[iFanoutObjIndex]; + else if ( DecType == 1 ) // F = ~i * G + Gate = ~s_Truths6[iFanoutFaninIndex] & s_Truths6[iFanoutObjIndex]; + else if ( DecType == 2 ) // F = ~i + G + Gate = ~s_Truths6[iFanoutFaninIndex] | s_Truths6[iFanoutObjIndex]; + else if ( DecType == 3 ) // F = i + G + Gate = s_Truths6[iFanoutFaninIndex] | s_Truths6[iFanoutObjIndex]; + else if ( DecType == 4 ) // F = i # G + Gate = s_Truths6[iFanoutFaninIndex] ^ s_Truths6[iFanoutObjIndex]; + else assert( 0 ); + uTruthFanNew = (~Gate & c0) | (Gate & c1); + // update functions + Vec_WrdWriteEntry( &p->vObjTruth, iObj, Abc_Tt6RemoveVar(uTruthObjNew, iFaninIndex) ); + Vec_WrdWriteEntry( &p->vObjTruth, iFanout, uTruthFanNew ); + // update fanins + Acb_ObjRemoveFaninFanoutOne( p, iObj, iFanin ); + if ( iFanoutFaninIndex == Acb_ObjFaninNum(p, iFanout) ) // adding new + Acb_ObjAddFaninFanoutOne( p, iFanout, iFanin ); +} + +/**Function************************************************************* + + Synopsis [Pushing logic to the fanin.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Acb_ObjPushToFanin( Acb_Ntk_t * p, int iObj, int iFaninIndex2, int iFanin ) +{ + word uTruthObjNew, uTruthObj = Acb_ObjTruth( p, iObj ); + word uTruthFanNew, uTruthFan = Acb_ObjTruth( p, iFanin ); + int iFaninIndex = Acb_ObjWhatFanin( p, iObj, iFanin ); + int DecType = Abc_TtCheckDsdAnd( uTruthObj, iFaninIndex, iFaninIndex2, &uTruthObjNew ); + int iFanin2 = Acb_ObjFanin( p, iObj, iFaninIndex2 ); + int iFaninFaninIndex = Acb_ObjWhatFanin( p, iFanin, iFanin2 ); + if ( iFaninFaninIndex == -1 ) + iFaninFaninIndex = Acb_ObjFaninNum(p, iFanin); + assert( !Acb_ObjIsCio(p, iObj) ); + assert( !Acb_ObjIsCio(p, iFanin) ); + assert( iFaninIndex < Acb_ObjFaninNum(p, iObj) ); + assert( iFaninIndex2 < Acb_ObjFaninNum(p, iObj) ); + assert( iFaninIndex != iFaninIndex2 ); + assert( Acb_ObjFanoutNum(p, iFanin) == 1 ); + // compute new function of the fanout + if ( DecType == 0 ) // i * j + uTruthFanNew = uTruthFan & s_Truths6[iFaninFaninIndex]; + else if ( DecType == 1 ) // i * !j + uTruthFanNew = ~uTruthFan & s_Truths6[iFaninFaninIndex]; + else if ( DecType == 2 ) // !i * j + uTruthFanNew = uTruthFan & ~s_Truths6[iFaninFaninIndex]; + else if ( DecType == 3 ) // !i * !j + uTruthFanNew = ~uTruthFan & ~s_Truths6[iFaninFaninIndex]; + else if ( DecType == 4 ) // i # j + uTruthFanNew = uTruthFan ^ s_Truths6[iFaninFaninIndex]; + else assert( 0 ); + // update functions + Vec_WrdWriteEntry( &p->vObjTruth, iObj, Abc_Tt6RemoveVar(uTruthObjNew, iFaninIndex2) ); + Vec_WrdWriteEntry( &p->vObjTruth, iFanin, uTruthFanNew ); + // update fanins + Acb_ObjRemoveFaninFanoutOne( p, iObj, iFanin2 ); + if ( iFaninFaninIndex == Acb_ObjFaninNum(p, iFanin) ) // adding new + Acb_ObjAddFaninFanoutOne( p, iFanin, iFanin2 ); +} + +/**Function************************************************************* + + Synopsis [Removing constants, buffers, duplicated fanins.] Description [] @@ -42,50 +140,155 @@ ABC_NAMESPACE_IMPL_START SeeAlso [] ***********************************************************************/ -int Acb_ObjCheckFaninDsd( Acb_Ntk_t * p, int iObj, int iFanIndex ) +static inline int Acb_ObjFindNodeFanout( Acb_Ntk_t * p, int iObj ) +{ + int i, iFanout; + Acb_ObjForEachFanout( p, iObj, iFanout, i ) + if ( !Acb_ObjIsCio(p, iFanout) ) + return iFanout; + return -1; +} +int Acb_ObjSuppMin_int( Acb_Ntk_t * p, int iObj ) { int k, iFanin, * pFanins; + word uTruth = Acb_ObjTruth( p, iObj ); Acb_ObjForEachFaninFast( p, iObj, pFanins, iFanin, k ) - if ( Abc_TtCheckDsdAnd(Acb_ObjTruth(p, iObj), iFanIndex, k, NULL) >= 0 ) - return 1; + { + if ( Abc_Tt6HasVar(uTruth, k) ) + continue; + Acb_ObjDeleteFaninIndex( p, iObj, k ); + Vec_IntRemove( Vec_WecEntry(&p->vFanouts, iFanin), iObj ); + Vec_WrdWriteEntry( &p->vObjTruth, iObj, Abc_Tt6RemoveVar(uTruth, k) ); + return 1; + } return 0; } -int Acb_ObjCountFaninAbsorb( Acb_Ntk_t * p, int iObj, int iFanin, int iFanIndex, int nLutSize ) +void Acb_ObjSuppMin( Acb_Ntk_t * p, int iObj ) { - if ( Acb_ObjSetTravIdCur(p, iFanin) ) - return 0; - if ( Acb_ObjIsCi(p, iFanin) ) - return 0; - if ( Acb_ObjFanoutNum(p, iFanin) > 1 ) - return 0; - if ( !Acb_ObjCheckFaninDsd(p, iObj, iFanIndex) ) - return 0; - if ( Acb_ObjFaninNum(p, iFanin) == nLutSize ) - return 0; - return 1; + while ( Acb_ObjSuppMin_int(p, iObj) ); } -int Acb_NtkObjPushEstimate( Acb_Ntk_t * p, int iObj, int nLutSize ) +void Acb_ObjRemoveDup( Acb_Ntk_t * p, int iObj, int i, int j ) { - int k, iFanin, * pFanins; - int Count = Acb_ObjFaninNum(p, iObj); - Acb_NtkIncTravId( p ); - Acb_ObjForEachFaninFast( p, iObj, pFanins, iFanin, k ) + word c00, c11, uTruthNew, uTruth = Acb_ObjTruth( p, iObj ); + assert( !Acb_ObjIsCio(p, iObj) ); + assert( Acb_ObjFanin(p, iObj, i) == Acb_ObjFanin(p, iObj, j) ); + c00 = Abc_Tt6Cofactor0( Abc_Tt6Cofactor0(uTruth, i), j ); + c11 = Abc_Tt6Cofactor1( Abc_Tt6Cofactor1(uTruth, i), j ); + uTruthNew = (~s_Truths6[i] & c00) | (s_Truths6[i] & c11); + Vec_WrdWriteEntry( &p->vObjTruth, iObj, Abc_Tt6RemoveVar(uTruthNew, j) ); + Acb_ObjDeleteFaninIndex( p, iObj, j ); + Vec_IntRemove( Vec_WecEntry(&p->vFanouts, iObj), Acb_ObjFanin(p, iObj, j) ); + Acb_ObjSuppMin( p, iObj ); +} +int Acb_ObjRemoveDupFanins_int( Acb_Ntk_t * p, int iObj ) +{ + int i, k, * pFanins = Acb_ObjFanins( p, iObj ); + for ( i = 0; i < pFanins[0]; i++ ) + for ( k = i+1; k < pFanins[0]; k++ ) { - Count -= Acb_ObjCountFaninAbsorb( p, iObj, iFanin, k, nLutSize ); - if ( Count <= 0 ) - return 1; + if ( pFanins[1+i] != pFanins[1+k] ) + continue; + Acb_ObjRemoveDup( p, iObj, i, k ); + return 1; } - if ( Acb_ObjFanoutNum(p, iObj) > 1 ) - return 0; + return 0; +} +void Acb_ObjRemoveDupFanins( Acb_Ntk_t * p, int iObj ) +{ + assert( !Acb_ObjIsCio(p, iObj) ); + while ( Acb_ObjRemoveDupFanins_int(p, iObj) ); +} +void Acb_ObjRemoveConst( Acb_Ntk_t * p, int iObj ) +{ + int iFanout; + word uTruth = Acb_ObjTruth( p, iObj ); + assert( !Acb_ObjIsCio(p, iObj) ); + assert( Acb_ObjFaninNum(p, iObj) == 0 ); + assert( uTruth == 0 || ~uTruth == 0 ); + while ( (iFanout = Acb_ObjFindNodeFanout(p, iObj)) >= 0 ) + { + int iObjIndex = Acb_ObjWhatFanin( p, iFanout, iObj ); + word uTruthF = Acb_ObjTruth( p, iFanout ); + Acb_ObjRemoveFaninFanoutOne( p, iFanout, iObj ); + uTruthF = (uTruth & 1) ? Abc_Tt6Cofactor1(uTruthF, iObjIndex) : Abc_Tt6Cofactor0(uTruthF, iObjIndex); + Vec_WrdWriteEntry( &p->vObjTruth, iFanout, Abc_Tt6RemoveVar(uTruthF, iObjIndex) ); + Acb_ObjSuppMin( p, iFanout ); + } + if ( Acb_ObjFanoutNum(p, iObj) == 0 ) + Acb_ObjCleanType( p, iObj ); +} +void Acb_ObjRemoveBufInv( Acb_Ntk_t * p, int iObj ) +{ + int iFanout; + word uTruth = Acb_ObjTruth( p, iObj ); + assert( !Acb_ObjIsCio(p, iObj) ); + assert( Acb_ObjFaninNum(p, iObj) == 1 ); + assert( uTruth == s_Truths6[0] || ~uTruth == s_Truths6[0] ); + while ( (iFanout = Acb_ObjFindNodeFanout(p, iObj)) >= 0 ) + { + int iFanin = Acb_ObjFanin( p, iObj, 0 ); + int iObjIndex = Acb_ObjWhatFanin( p, iFanout, iObj ); + Acb_ObjPatchFanin( p, iFanout, iObj, iFanin ); + if ( uTruth & 1 ) // inv + { + word uTruthF = Acb_ObjTruth( p, iFanout ); + Vec_WrdWriteEntry( &p->vObjTruth, iFanout, Abc_Tt6Flip(uTruthF, iObjIndex) ); + } + Acb_ObjRemoveDupFanins( p, iFanout ); + } + while ( (uTruth & 1) == 0 && Acb_ObjFanoutNum(p, iObj) > 0 ) + { + int iFanin = Acb_ObjFanin( p, iObj, 0 ); + int iFanout = Acb_ObjFanout( p, iObj, 0 ); + assert( Acb_ObjIsCo(p, iFanout) ); + Acb_ObjPatchFanin( p, iFanout, iObj, iFanin ); + } + if ( Acb_ObjFanoutNum(p, iObj) == 0 ) + { + Acb_ObjRemoveFaninFanout( p, iObj ); + Acb_ObjRemoveFanins( p, iObj ); + Acb_ObjCleanType( p, iObj ); + } +} + +/**Function************************************************************* + + Synopsis [Check if the node can have its logic pushed.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +static inline int Acb_ObjFindPushableIndex( Acb_Ntk_t * p, int iObj, int iFanIndex ) +{ + int k, iFanin, * pFanins; Acb_ObjForEachFaninFast( p, iObj, pFanins, iFanin, k ) - if ( Abc_TtCheckOutAnd(Acb_ObjTruth(p, iObj), k, NULL) ) - break; - if ( k == Acb_ObjFaninNum(p, iFanin) ) - return 0; - iFanin = Vec_IntEntry( Acb_ObjFanout(p, iObj), 0 ); - if ( Acb_ObjFaninNum(p, iFanin) == nLutSize ) + if ( k != iFanIndex && Abc_TtCheckDsdAnd(Acb_ObjTruth(p, iObj), k, iFanIndex, NULL) >= 0 ) + return k; + return -1; +} +int Acb_ObjPushToFanins( Acb_Ntk_t * p, int iObj, int nLutSize ) +{ + int k, k2, iFanin, * pFanins; + if ( Acb_ObjFaninNum(p, iObj) < 2 ) return 0; - return 1; + Acb_ObjForEachFaninFast( p, iObj, pFanins, iFanin, k ) + { + if ( Acb_ObjIsCi(p, iFanin) ) + continue; + if ( Acb_ObjFanoutNum(p, iFanin) > 1 ) + continue; + if ( Acb_ObjFaninNum(p, iFanin) == nLutSize ) + continue; + if ( (k2 = Acb_ObjFindPushableIndex(p, iObj, k)) == -1 ) + continue; + Acb_ObjPushToFanin( p, iObj, k2, iFanin ); + return 1; + } + return 0; } /**Function************************************************************* @@ -101,18 +304,43 @@ int Acb_NtkObjPushEstimate( Acb_Ntk_t * p, int iObj, int nLutSize ) ***********************************************************************/ void Acb_NtkPushLogic( Acb_Ntk_t * p, int nLutSize, int fVerbose ) { - //Vec_Bit_t * vVisited = Vec_BitStart( Acb_NtkObjNumMax(p) ); - int n = 0, iObj, nNodes = 0; + int n = 0, iObj, nNodes = Acb_NtkNodeNum(p), nPushes = 0; Acb_NtkCreateFanout( p ); // fanout data structure + Acb_NtkForEachNodeSupp( p, iObj, 0 ) + Acb_ObjRemoveConst( p, iObj ); + Acb_NtkForEachNodeSupp( p, iObj, 1 ) + Acb_ObjRemoveBufInv( p, iObj ); for ( n = 2; n <= nLutSize; n++ ) - Acb_NtkForEachNode( p, iObj ) + Acb_NtkForEachNodeSupp( p, iObj, n ) { - if ( !Acb_NtkObjPushEstimate(p, iObj, nLutSize) ) - continue; - nNodes++; + while ( Acb_ObjPushToFanins(p, iObj, nLutSize) ) + nPushes++; + if ( Acb_ObjFaninNum(p, iObj) == 1 ) + Acb_ObjRemoveBufInv( p, iObj ); } - printf( "Performed optimization at %d nodes.\n", nNodes ); - //Vec_BitFree( vVisited ); + printf( "Saved %d nodes after %d pushes.\n", nNodes - Acb_NtkNodeNum(p), nPushes ); +} + +/**Function************************************************************* + + Synopsis [Pushing logic to the fanin.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Acb_NtkPushLogic2( Acb_Ntk_t * p, int nLutSize, int fVerbose ) +{ + int iObj; + Acb_NtkCreateFanout( p ); // fanout data structure + Acb_NtkForEachObj( p, iObj ) + if ( !Acb_ObjIsCio(p, iObj) ) + break; + Acb_ObjPushToFanout( p, iObj, Acb_ObjFaninNum(p, iObj)-1, Acb_ObjFanout(p, iObj, 0) ); +// Acb_ObjPushToFanin( p, Acb_ObjFanout(p, iObj, 0), Acb_ObjFaninNum(p, iObj)-1, iObj ); } //////////////////////////////////////////////////////////////////////// |