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+/**CFile****************************************************************
+
+ FileName [ivyDsd.c]
+
+ SystemName [ABC: Logic synthesis and verification system.]
+
+ PackageName [And-Inverter Graph package.]
+
+ Synopsis [Disjoint-support decomposition.]
+
+ Author [Alan Mishchenko]
+
+ Affiliation [UC Berkeley]
+
+ Date [Ver. 1.0. Started - May 11, 2006.]
+
+ Revision [$Id: ivyDsd.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "ivy.h"
+
+////////////////////////////////////////////////////////////////////////
+/// DECLARATIONS ///
+////////////////////////////////////////////////////////////////////////
+
+// decomposition types
+typedef enum {
+ IVY_DEC_PI, // 0: var
+ IVY_DEC_CONST1, // 1: CONST1
+ IVY_DEC_BUF, // 2: BUF
+ IVY_DEC_AND, // 3: AND
+ IVY_DEC_EXOR, // 4: EXOR
+ IVY_DEC_MUX, // 5: MUX
+ IVY_DEC_MAJ, // 6: MAJ
+ IVY_DEC_PRIME // 7: undecomposable
+} Ivy_DecType_t;
+
+typedef struct Ivy_Dec_t_ Ivy_Dec_t;
+struct Ivy_Dec_t_
+{
+ unsigned Type : 4; // the node type (PI, CONST1, AND, EXOR, MUX, PRIME)
+ unsigned fCompl : 1; // shows if node is complemented (root node only)
+ unsigned nFans : 3; // the number of fanins
+ unsigned Fan0 : 4; // fanin 0
+ unsigned Fan1 : 4; // fanin 1
+ unsigned Fan2 : 4; // fanin 2
+ unsigned Fan3 : 4; // fanin 3
+ unsigned Fan4 : 4; // fanin 4
+ unsigned Fan5 : 4; // fanin 5
+};
+
+static inline int Ivy_DecToInt( Ivy_Dec_t Node ) { return *((int *)&Node); }
+static inline Ivy_Dec_t Ivy_IntToDec( int Node ) { return *((Ivy_Dec_t *)&Node); }
+static inline void Ivy_DecClear( Ivy_Dec_t * pNode ) { *((int *)pNode) = 0; }
+
+
+static unsigned s_Masks[6][2] = {
+ { 0x55555555, 0xAAAAAAAA },
+ { 0x33333333, 0xCCCCCCCC },
+ { 0x0F0F0F0F, 0xF0F0F0F0 },
+ { 0x00FF00FF, 0xFF00FF00 },
+ { 0x0000FFFF, 0xFFFF0000 },
+ { 0x00000000, 0xFFFFFFFF }
+};
+
+static inline int Ivy_TruthWordCountOnes( unsigned uWord )
+{
+ uWord = (uWord & 0x55555555) + ((uWord>>1) & 0x55555555);
+ uWord = (uWord & 0x33333333) + ((uWord>>2) & 0x33333333);
+ uWord = (uWord & 0x0F0F0F0F) + ((uWord>>4) & 0x0F0F0F0F);
+ uWord = (uWord & 0x00FF00FF) + ((uWord>>8) & 0x00FF00FF);
+ return (uWord & 0x0000FFFF) + (uWord>>16);
+}
+
+static inline int Ivy_TruthCofactorIsConst( unsigned uTruth, int Var, int Cof, int Const )
+{
+ if ( Const == 0 )
+ return (uTruth & s_Masks[Var][Cof]) == 0;
+ else
+ return (uTruth & s_Masks[Var][Cof]) == s_Masks[Var][Cof];
+}
+
+static inline int Ivy_TruthCofactorIsOne( unsigned uTruth, int Var )
+{
+ return (uTruth & s_Masks[Var][0]) == 0;
+}
+
+static inline unsigned Ivy_TruthCofactor( unsigned uTruth, int Var )
+{
+ unsigned uCofactor = uTruth & s_Masks[Var >> 1][(Var & 1) == 0];
+ int Shift = (1 << (Var >> 1));
+ if ( Var & 1 )
+ return uCofactor | (uCofactor << Shift);
+ return uCofactor | (uCofactor >> Shift);
+}
+
+static inline unsigned Ivy_TruthCofactor2( unsigned uTruth, int Var0, int Var1 )
+{
+ return Ivy_TruthCofactor( Ivy_TruthCofactor(uTruth, Var0), Var1 );
+}
+
+// returns 1 if the truth table depends on this var (var is regular interger var)
+static inline int Ivy_TruthDepends( unsigned uTruth, int Var )
+{
+ return Ivy_TruthCofactor(uTruth, Var << 1) != Ivy_TruthCofactor(uTruth, (Var << 1) | 1);
+}
+
+static inline void Ivy_DecSetVar( Ivy_Dec_t * pNode, int iNum, unsigned Var )
+{
+ assert( iNum >= 0 && iNum <= 5 );
+ switch( iNum )
+ {
+ case 0: pNode->Fan0 = Var; break;
+ case 1: pNode->Fan1 = Var; break;
+ case 2: pNode->Fan2 = Var; break;
+ case 3: pNode->Fan3 = Var; break;
+ case 4: pNode->Fan4 = Var; break;
+ case 5: pNode->Fan5 = Var; break;
+ }
+}
+
+static inline unsigned Ivy_DecGetVar( Ivy_Dec_t * pNode, int iNum )
+{
+ assert( iNum >= 0 && iNum <= 5 );
+ switch( iNum )
+ {
+ case 0: return pNode->Fan0;
+ case 1: return pNode->Fan1;
+ case 2: return pNode->Fan2;
+ case 3: return pNode->Fan3;
+ case 4: return pNode->Fan4;
+ case 5: return pNode->Fan5;
+ }
+ return ~0;
+}
+
+static int Ivy_TruthDecompose_rec( unsigned uTruth, Vec_Int_t * vTree );
+static int Ivy_TruthRecognizeMuxMaj( unsigned uTruth, int * pSupp, int nSupp, Vec_Int_t * vTree );
+
+//int nTruthDsd;
+
+////////////////////////////////////////////////////////////////////////
+/// FUNCTION DEFINITIONS ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+ Synopsis [Computes DSD of truth table of 5 variables or less.]
+
+ Description [Returns 1 if the function is a constant or is fully
+ DSD decomposable using AND/EXOR/MUX gates.]
+
+ SideEffects []
+
+ SeeAlso []
+
+***********************************************************************/
+int Ivy_TruthDsd( unsigned uTruth, Vec_Int_t * vTree )
+{
+ Ivy_Dec_t Node;
+ int i, RetValue;
+ // set the PI variables
+ Vec_IntClear( vTree );
+ for ( i = 0; i < 5; i++ )
+ Vec_IntPush( vTree, 0 );
+ // check if it is a constant
+ if ( uTruth == 0 || ~uTruth == 0 )
+ {
+ Ivy_DecClear( &Node );
+ Node.Type = IVY_DEC_CONST1;
+ Node.fCompl = (uTruth == 0);
+ Vec_IntPush( vTree, Ivy_DecToInt(Node) );
+ return 1;
+ }
+ // perform the decomposition
+ RetValue = Ivy_TruthDecompose_rec( uTruth, vTree );
+ if ( RetValue == -1 )
+ return 0;
+ // get the topmost node
+ if ( (RetValue >> 1) < 5 )
+ { // add buffer
+ Ivy_DecClear( &Node );
+ Node.Type = IVY_DEC_BUF;
+ Node.fCompl = (RetValue & 1);
+ Node.Fan0 = ((RetValue >> 1) << 1);
+ Vec_IntPush( vTree, Ivy_DecToInt(Node) );
+ }
+ else if ( RetValue & 1 )
+ { // check if the topmost node has to be complemented
+ Node = Ivy_IntToDec( Vec_IntPop(vTree) );
+ assert( Node.fCompl == 0 );
+ Node.fCompl = (RetValue & 1);
+ Vec_IntPush( vTree, Ivy_DecToInt(Node) );
+ }
+ if ( uTruth != Ivy_TruthDsdCompute(vTree) )
+ printf( "Verification failed.\n" );
+ return 1;
+}
+
+/**Function*************************************************************
+
+ Synopsis [Computes DSD of truth table.]
+
+ Description [Returns the number of topmost decomposition node.]
+
+ SideEffects []
+
+ SeeAlso []
+
+***********************************************************************/
+int Ivy_TruthDecompose_rec( unsigned uTruth, Vec_Int_t * vTree )
+{
+ Ivy_Dec_t Node;
+ int Supp[5], Vars0[5], Vars1[5], Vars2[5], * pVars;
+ int nSupp, Count0, Count1, Count2, nVars, RetValue, fCompl, i;
+ unsigned uTruthCof, uCof0, uCof1;
+
+ // get constant confactors
+ Count0 = Count1 = Count2 = nSupp = 0;
+ for ( i = 0; i < 5; i++ )
+ {
+ if ( Ivy_TruthCofactorIsConst(uTruth, i, 0, 0) )
+ Vars0[Count0++] = (i << 1) | 0;
+ else if ( Ivy_TruthCofactorIsConst(uTruth, i, 1, 0) )
+ Vars0[Count0++] = (i << 1) | 1;
+ else if ( Ivy_TruthCofactorIsConst(uTruth, i, 0, 1) )
+ Vars1[Count1++] = (i << 1) | 0;
+ else if ( Ivy_TruthCofactorIsConst(uTruth, i, 1, 1) )
+ Vars1[Count1++] = (i << 1) | 1;
+ else
+ {
+ uCof0 = Ivy_TruthCofactor( uTruth, (i << 1) | 1 );
+ uCof1 = Ivy_TruthCofactor( uTruth, (i << 1) | 0 );
+ if ( uCof0 == ~uCof1 )
+ Vars2[Count2++] = (i << 1) | 0;
+ else if ( uCof0 != uCof1 )
+ Supp[nSupp++] = i;
+ }
+ }
+ assert( Count0 == 0 || Count1 == 0 );
+ assert( Count0 == 0 || Count2 == 0 );
+ assert( Count1 == 0 || Count2 == 0 );
+
+ // consider the case of a single variable
+ if ( Count0 == 1 && nSupp == 0 )
+ return Vars0[0];
+
+ // consider more complex decompositions
+ if ( Count0 == 0 && Count1 == 0 && Count2 == 0 )
+ return Ivy_TruthRecognizeMuxMaj( uTruth, Supp, nSupp, vTree );
+
+ // extract the nodes
+ Ivy_DecClear( &Node );
+ if ( Count0 > 0 )
+ nVars = Count0, pVars = Vars0, Node.Type = IVY_DEC_AND, fCompl = 0;
+ else if ( Count1 > 0 )
+ nVars = Count1, pVars = Vars1, Node.Type = IVY_DEC_AND, fCompl = 1, uTruth = ~uTruth;
+ else if ( Count2 > 0 )
+ nVars = Count2, pVars = Vars2, Node.Type = IVY_DEC_EXOR, fCompl = 0;
+ else
+ assert( 0 );
+ Node.nFans = nVars+(nSupp>0);
+
+ // compute cofactor
+ uTruthCof = uTruth;
+ for ( i = 0; i < nVars; i++ )
+ {
+ uTruthCof = Ivy_TruthCofactor( uTruthCof, pVars[i] );
+ Ivy_DecSetVar( &Node, i, pVars[i] );
+ }
+
+ if ( Node.Type == IVY_DEC_EXOR )
+ fCompl ^= ((Node.nFans & 1) == 0);
+
+ if ( nSupp > 0 )
+ {
+ assert( uTruthCof != 0 && ~uTruthCof != 0 );
+ // call recursively
+ RetValue = Ivy_TruthDecompose_rec( uTruthCof, vTree );
+ // quit if non-decomposable
+ if ( RetValue == -1 )
+ return -1;
+ // remove the complement from the child if the node is EXOR
+ if ( Node.Type == IVY_DEC_EXOR && (RetValue & 1) )
+ {
+ fCompl ^= 1;
+ RetValue ^= 1;
+ }
+ // set the new decomposition
+ Ivy_DecSetVar( &Node, nVars, RetValue );
+ }
+ else if ( Node.Type == IVY_DEC_EXOR )
+ fCompl ^= (uTruthCof == 0);
+
+ Vec_IntPush( vTree, Ivy_DecToInt(Node) );
+ return ((Vec_IntSize(vTree)-1) << 1) | fCompl;
+}
+
+/**Function*************************************************************
+
+ Synopsis [Returns a non-negative number if the truth table is a MUX.]
+
+ Description [If the truth table is a MUX, returns the variable as follows:
+ first, control variable; second, positive cofactor; third, negative cofactor.]
+
+ SideEffects []
+
+ SeeAlso []
+
+***********************************************************************/
+int Ivy_TruthRecognizeMuxMaj( unsigned uTruth, int * pSupp, int nSupp, Vec_Int_t * vTree )
+{
+ Ivy_Dec_t Node;
+ int i, k, RetValue0, RetValue1;
+ unsigned uCof0, uCof1, Num;
+ char Count[3];
+ assert( nSupp >= 3 );
+ // start the node
+ Ivy_DecClear( &Node );
+ Node.Type = IVY_DEC_MUX;
+ Node.nFans = 3;
+ // try each of the variables
+ for ( i = 0; i < nSupp; i++ )
+ {
+ // get the cofactors with respect to these variables
+ uCof0 = Ivy_TruthCofactor( uTruth, (pSupp[i] << 1) | 1 );
+ uCof1 = Ivy_TruthCofactor( uTruth, pSupp[i] << 1 );
+ // go through all other variables and make sure
+ // each of them belongs to the support of one cofactor
+ for ( k = 0; k < nSupp; k++ )
+ {
+ if ( k == i )
+ continue;
+ if ( Ivy_TruthDepends(uCof0, pSupp[k]) && Ivy_TruthDepends(uCof1, pSupp[k]) )
+ break;
+ }
+ if ( k < nSupp )
+ continue;
+ // MUX decomposition exists
+ RetValue0 = Ivy_TruthDecompose_rec( uCof0, vTree );
+ if ( RetValue0 == -1 )
+ break;
+ RetValue1 = Ivy_TruthDecompose_rec( uCof1, vTree );
+ if ( RetValue1 == -1 )
+ break;
+ // both of them exist; create the node
+ Ivy_DecSetVar( &Node, 0, pSupp[i] << 1 );
+ Ivy_DecSetVar( &Node, 1, RetValue1 );
+ Ivy_DecSetVar( &Node, 2, RetValue0 );
+ Vec_IntPush( vTree, Ivy_DecToInt(Node) );
+ return ((Vec_IntSize(vTree)-1) << 1) | 0;
+ }
+ // check majority gate
+ if ( nSupp > 3 )
+ return -1;
+ if ( Ivy_TruthWordCountOnes(uTruth) != 16 )
+ return -1;
+ // this is a majority gate; determine polarity
+ Node.Type = IVY_DEC_MAJ;
+ Count[0] = Count[1] = Count[2] = 0;
+ for ( i = 0; i < 8; i++ )
+ {
+ Num = 0;
+ for ( k = 0; k < 3; k++ )
+ if ( i & (1 << k) )
+ Num |= (1 << pSupp[k]);
+ assert( Num < 32 );
+ if ( (uTruth & (1 << Num)) == 0 )
+ continue;
+ for ( k = 0; k < 3; k++ )
+ if ( i & (1 << k) )
+ Count[k]++;
+ }
+ assert( Count[0] == 1 || Count[0] == 3 );
+ assert( Count[1] == 1 || Count[1] == 3 );
+ assert( Count[2] == 1 || Count[2] == 3 );
+ Ivy_DecSetVar( &Node, 0, (pSupp[0] << 1)|(Count[0] == 1) );
+ Ivy_DecSetVar( &Node, 1, (pSupp[1] << 1)|(Count[1] == 1) );
+ Ivy_DecSetVar( &Node, 2, (pSupp[2] << 1)|(Count[2] == 1) );
+ Vec_IntPush( vTree, Ivy_DecToInt(Node) );
+ return ((Vec_IntSize(vTree)-1) << 1) | 0;
+}
+
+
+/**Function*************************************************************
+
+ Synopsis [Computes truth table of decomposition tree for verification.]
+
+ Description []
+
+ SideEffects []
+
+ SeeAlso []
+
+***********************************************************************/
+unsigned Ivy_TruthDsdCompute_rec( int iNode, Vec_Int_t * vTree )
+{
+ unsigned uTruthChild, uTruthTotal;
+ int Var, i;
+ // get the node
+ Ivy_Dec_t Node = Ivy_IntToDec( Vec_IntEntry(vTree, iNode) );
+ // compute the node function
+ if ( Node.Type == IVY_DEC_CONST1 )
+ return s_Masks[5][ !Node.fCompl ];
+ if ( Node.Type == IVY_DEC_PI )
+ return s_Masks[iNode][ !Node.fCompl ];
+ if ( Node.Type == IVY_DEC_BUF )
+ {
+ uTruthTotal = Ivy_TruthDsdCompute_rec( Node.Fan0 >> 1, vTree );
+ return Node.fCompl? ~uTruthTotal : uTruthTotal;
+ }
+ if ( Node.Type == IVY_DEC_AND )
+ {
+ uTruthTotal = s_Masks[5][1];
+ for ( i = 0; i < (int)Node.nFans; i++ )
+ {
+ Var = Ivy_DecGetVar( &Node, i );
+ uTruthChild = Ivy_TruthDsdCompute_rec( Var >> 1, vTree );
+ uTruthTotal = (Var & 1)? uTruthTotal & ~uTruthChild : uTruthTotal & uTruthChild;
+ }
+ return Node.fCompl? ~uTruthTotal : uTruthTotal;
+ }
+ if ( Node.Type == IVY_DEC_EXOR )
+ {
+ uTruthTotal = 0;
+ for ( i = 0; i < (int)Node.nFans; i++ )
+ {
+ Var = Ivy_DecGetVar( &Node, i );
+ uTruthTotal ^= Ivy_TruthDsdCompute_rec( Var >> 1, vTree );
+ assert( (Var & 1) == 0 );
+ }
+ return Node.fCompl? ~uTruthTotal : uTruthTotal;
+ }
+ assert( Node.fCompl == 0 );
+ if ( Node.Type == IVY_DEC_MUX || Node.Type == IVY_DEC_MAJ )
+ {
+ unsigned uTruthChildC, uTruthChild1, uTruthChild0;
+ int VarC, Var1, Var0;
+ VarC = Ivy_DecGetVar( &Node, 0 );
+ Var1 = Ivy_DecGetVar( &Node, 1 );
+ Var0 = Ivy_DecGetVar( &Node, 2 );
+ uTruthChildC = Ivy_TruthDsdCompute_rec( VarC >> 1, vTree );
+ uTruthChild1 = Ivy_TruthDsdCompute_rec( Var1 >> 1, vTree );
+ uTruthChild0 = Ivy_TruthDsdCompute_rec( Var0 >> 1, vTree );
+ assert( Node.Type == IVY_DEC_MAJ || (VarC & 1) == 0 );
+ uTruthChildC = (VarC & 1)? ~uTruthChildC : uTruthChildC;
+ uTruthChild1 = (Var1 & 1)? ~uTruthChild1 : uTruthChild1;
+ uTruthChild0 = (Var0 & 1)? ~uTruthChild0 : uTruthChild0;
+ if ( Node.Type == IVY_DEC_MUX )
+ return (uTruthChildC & uTruthChild1) | (~uTruthChildC & uTruthChild0);
+ else
+ return (uTruthChildC & uTruthChild1) | (uTruthChildC & uTruthChild0) | (uTruthChild1 & uTruthChild0);
+ }
+ assert( 0 );
+ return 0;
+}
+
+
+/**Function*************************************************************
+
+ Synopsis [Computes truth table of decomposition tree for verification.]
+
+ Description []
+
+ SideEffects []
+
+ SeeAlso []
+
+***********************************************************************/
+unsigned Ivy_TruthDsdCompute( Vec_Int_t * vTree )
+{
+ return Ivy_TruthDsdCompute_rec( Vec_IntSize(vTree)-1, vTree );
+}
+
+/**Function*************************************************************
+
+ Synopsis [Prints the decomposition tree.]
+
+ Description []
+
+ SideEffects []
+
+ SeeAlso []
+
+***********************************************************************/
+void Ivy_TruthDsdPrint_rec( FILE * pFile, int iNode, Vec_Int_t * vTree )
+{
+ int Var, i;
+ // get the node
+ Ivy_Dec_t Node = Ivy_IntToDec( Vec_IntEntry(vTree, iNode) );
+ // compute the node function
+ if ( Node.Type == IVY_DEC_CONST1 )
+ fprintf( pFile, "Const1%s", (Node.fCompl? "\'" : "") );
+ else if ( Node.Type == IVY_DEC_PI )
+ fprintf( pFile, "%c%s", 'a' + iNode, (Node.fCompl? "\'" : "") );
+ else if ( Node.Type == IVY_DEC_BUF )
+ {
+ Ivy_TruthDsdPrint_rec( pFile, Node.Fan0 >> 1, vTree );
+ fprintf( pFile, "%s", (Node.fCompl? "\'" : "") );
+ }
+ else if ( Node.Type == IVY_DEC_AND )
+ {
+ fprintf( pFile, "AND(" );
+ for ( i = 0; i < (int)Node.nFans; i++ )
+ {
+ Var = Ivy_DecGetVar( &Node, i );
+ Ivy_TruthDsdPrint_rec( pFile, Var >> 1, vTree );
+ fprintf( pFile, "%s", (Var & 1)? "\'" : "" );
+ if ( i != (int)Node.nFans-1 )
+ fprintf( pFile, "," );
+ }
+ fprintf( pFile, ")%s", (Node.fCompl? "\'" : "") );
+ }
+ else if ( Node.Type == IVY_DEC_EXOR )
+ {
+ fprintf( pFile, "EXOR(" );
+ for ( i = 0; i < (int)Node.nFans; i++ )
+ {
+ Var = Ivy_DecGetVar( &Node, i );
+ Ivy_TruthDsdPrint_rec( pFile, Var >> 1, vTree );
+ if ( i != (int)Node.nFans-1 )
+ fprintf( pFile, "," );
+ assert( (Var & 1) == 0 );
+ }
+ fprintf( pFile, ")%s", (Node.fCompl? "\'" : "") );
+ }
+ else if ( Node.Type == IVY_DEC_MUX || Node.Type == IVY_DEC_MAJ )
+ {
+ int VarC, Var1, Var0;
+ assert( Node.fCompl == 0 );
+ VarC = Ivy_DecGetVar( &Node, 0 );
+ Var1 = Ivy_DecGetVar( &Node, 1 );
+ Var0 = Ivy_DecGetVar( &Node, 2 );
+ fprintf( pFile, "%s", (Node.Type == IVY_DEC_MUX)? "MUX(" : "MAJ(" );
+ Ivy_TruthDsdPrint_rec( pFile, VarC >> 1, vTree );
+ fprintf( pFile, "%s", (VarC & 1)? "\'" : "" );
+ fprintf( pFile, "," );
+ Ivy_TruthDsdPrint_rec( pFile, Var1 >> 1, vTree );
+ fprintf( pFile, "%s", (Var1 & 1)? "\'" : "" );
+ fprintf( pFile, "," );
+ Ivy_TruthDsdPrint_rec( pFile, Var0 >> 1, vTree );
+ fprintf( pFile, "%s", (Var0 & 1)? "\'" : "" );
+ fprintf( pFile, ")" );
+ }
+ else assert( 0 );
+}
+
+
+/**Function*************************************************************
+
+ Synopsis [Prints the decomposition tree.]
+
+ Description []
+
+ SideEffects []
+
+ SeeAlso []
+
+***********************************************************************/
+void Ivy_TruthDsdPrint( FILE * pFile, Vec_Int_t * vTree )
+{
+ fprintf( pFile, "F = " );
+ Ivy_TruthDsdPrint_rec( pFile, Vec_IntSize(vTree)-1, vTree );
+ fprintf( pFile, "\n" );
+}
+
+/**Function*************************************************************
+
+ Synopsis [Implement DSD in the AIG.]
+
+ Description []
+
+ SideEffects []
+
+ SeeAlso []
+
+***********************************************************************/
+Ivy_Obj_t * Ivy_ManDsdConstruct_rec( Ivy_Man_t * p, Vec_Int_t * vFront, int iNode, Vec_Int_t * vTree )
+{
+ Ivy_Obj_t * pResult, * pChild, * pNodes[16];
+ int Var, i;
+ // get the node
+ Ivy_Dec_t Node = Ivy_IntToDec( Vec_IntEntry(vTree, iNode) );
+ // compute the node function
+ if ( Node.Type == IVY_DEC_CONST1 )
+ return Ivy_NotCond( Ivy_ManConst1(p), Node.fCompl );
+ if ( Node.Type == IVY_DEC_PI )
+ {
+ pResult = Ivy_ManObj( p, Vec_IntEntry(vFront, iNode) );
+ return Ivy_NotCond( pResult, Node.fCompl );
+ }
+ if ( Node.Type == IVY_DEC_BUF )
+ {
+ pResult = Ivy_ManDsdConstruct_rec( p, vFront, Node.Fan0 >> 1, vTree );
+ return Ivy_NotCond( pResult, Node.fCompl );
+ }
+ if ( Node.Type == IVY_DEC_AND || Node.Type == IVY_DEC_EXOR )
+ {
+ for ( i = 0; i < (int)Node.nFans; i++ )
+ {
+ Var = Ivy_DecGetVar( &Node, i );
+ assert( Node.Type == IVY_DEC_AND || (Var & 1) == 0 );
+ pChild = Ivy_ManDsdConstruct_rec( p, vFront, Var >> 1, vTree );
+ pChild = Ivy_NotCond( pChild, (Var & 1) );
+ pNodes[i] = pChild;
+ }
+
+// Ivy_MultiEval( pNodes, Node.nFans, Node.Type == IVY_DEC_AND ? IVY_AND : IVY_EXOR );
+
+ pResult = Ivy_Multi( pNodes, Node.nFans, Node.Type == IVY_DEC_AND ? IVY_AND : IVY_EXOR );
+ return Ivy_NotCond( pResult, Node.fCompl );
+ }
+ assert( Node.fCompl == 0 );
+ if ( Node.Type == IVY_DEC_MUX || Node.Type == IVY_DEC_MAJ )
+ {
+ int VarC, Var1, Var0;
+ VarC = Ivy_DecGetVar( &Node, 0 );
+ Var1 = Ivy_DecGetVar( &Node, 1 );
+ Var0 = Ivy_DecGetVar( &Node, 2 );
+ pNodes[0] = Ivy_ManDsdConstruct_rec( p, vFront, VarC >> 1, vTree );
+ pNodes[1] = Ivy_ManDsdConstruct_rec( p, vFront, Var1 >> 1, vTree );
+ pNodes[2] = Ivy_ManDsdConstruct_rec( p, vFront, Var0 >> 1, vTree );
+ assert( Node.Type == IVY_DEC_MAJ || (VarC & 1) == 0 );
+ pNodes[0] = Ivy_NotCond( pNodes[0], (VarC & 1) );
+ pNodes[1] = Ivy_NotCond( pNodes[1], (Var1 & 1) );
+ pNodes[2] = Ivy_NotCond( pNodes[2], (Var0 & 1) );
+ if ( Node.Type == IVY_DEC_MUX )
+ return Ivy_Mux( pNodes[0], pNodes[1], pNodes[2] );
+ else
+ return Ivy_Maj( pNodes[0], pNodes[1], pNodes[2] );
+ }
+ assert( 0 );
+ return 0;
+}
+
+/**Function*************************************************************
+
+ Synopsis [Implement DSD in the AIG.]
+
+ Description []
+
+ SideEffects []
+
+ SeeAlso []
+
+***********************************************************************/
+Ivy_Obj_t * Ivy_ManDsdConstruct( Ivy_Man_t * p, Vec_Int_t * vFront, Vec_Int_t * vTree )
+{
+ int Entry, i;
+ // implement latches on the frontier (TEMPORARY!!!)
+ Vec_IntForEachEntry( vFront, Entry, i )
+ Vec_IntWriteEntry( vFront, i, Ivy_LeafId(Entry) );
+ // recursively construct the tree
+ return Ivy_ManDsdConstruct_rec( p, vFront, Vec_IntSize(vTree)-1, vTree );
+}
+
+
+
+/**Function*************************************************************
+
+ Synopsis []
+
+ Description []
+
+ SideEffects []
+
+ SeeAlso []
+
+***********************************************************************/
+void Ivy_TruthDsdComputePrint( unsigned uTruth )
+{
+ static Vec_Int_t * vTree = NULL;
+ if ( vTree == NULL )
+ vTree = Vec_IntAlloc( 12 );
+ if ( Ivy_TruthDsd( uTruth, vTree ) )
+ Ivy_TruthDsdPrint( stdout, vTree );
+ else
+ printf( "Undecomposable\n" );
+}
+
+/**Function*************************************************************
+
+ Synopsis []
+
+ Description []
+
+ SideEffects []
+
+ SeeAlso []
+
+***********************************************************************/
+void Ivy_TruthTestOne( unsigned uTruth )
+{
+ static int Counter = 0;
+ static Vec_Int_t * vTree = NULL;
+ // decompose
+ if ( vTree == NULL )
+ vTree = Vec_IntAlloc( 12 );
+
+ if ( !Ivy_TruthDsd( uTruth, vTree ) )
+ {
+// printf( "Undecomposable\n" );
+ }
+ else
+ {
+// nTruthDsd++;
+ printf( "%5d : ", Counter++ );
+ Extra_PrintBinary( stdout, &uTruth, 32 );
+ printf( " " );
+ Ivy_TruthDsdPrint( stdout, vTree );
+ if ( uTruth != Ivy_TruthDsdCompute(vTree) )
+ printf( "Verification failed.\n" );
+ }
+// Vec_IntFree( vTree );
+}
+
+/**Function*************************************************************
+
+ Synopsis []
+
+ Description []
+
+ SideEffects []
+
+ SeeAlso []
+
+***********************************************************************/
+void Ivy_TruthTest()
+{
+ FILE * pFile;
+ char Buffer[100];
+ unsigned uTruth;
+ int i;
+
+ pFile = fopen( "npn4.txt", "r" );
+ for ( i = 0; i < 222; i++ )
+// pFile = fopen( "npn5.txt", "r" );
+// for ( i = 0; i < 616126; i++ )
+ {
+ fscanf( pFile, "%s", Buffer );
+ Extra_ReadHexadecimal( &uTruth, Buffer+2, 4 );
+// Extra_ReadHexadecimal( &uTruth, Buffer+2, 5 );
+ uTruth |= (uTruth << 16);
+// uTruth = ~uTruth;
+ Ivy_TruthTestOne( uTruth );
+ }
+ fclose( pFile );
+}
+
+/**Function*************************************************************
+
+ Synopsis []
+
+ Description []
+
+ SideEffects []
+
+ SeeAlso []
+
+***********************************************************************/
+void Ivy_TruthTest3()
+{
+ FILE * pFile;
+ char Buffer[100];
+ unsigned uTruth;
+ int i;
+
+ pFile = fopen( "npn3.txt", "r" );
+ for ( i = 0; i < 14; i++ )
+ {
+ fscanf( pFile, "%s", Buffer );
+ Extra_ReadHexadecimal( &uTruth, Buffer+2, 3 );
+ uTruth = uTruth | (uTruth << 8) | (uTruth << 16) | (uTruth << 24);
+ Ivy_TruthTestOne( uTruth );
+ }
+ fclose( pFile );
+}
+
+/**Function*************************************************************
+
+ Synopsis []
+
+ Description []
+
+ SideEffects []
+
+ SeeAlso []
+
+***********************************************************************/
+void Ivy_TruthTest5()
+{
+ FILE * pFile;
+ char Buffer[100];
+ unsigned uTruth;
+ int i;
+
+// pFile = fopen( "npn4.txt", "r" );
+// for ( i = 0; i < 222; i++ )
+ pFile = fopen( "npn5.txt", "r" );
+ for ( i = 0; i < 616126; i++ )
+ {
+ fscanf( pFile, "%s", Buffer );
+// Extra_ReadHexadecimal( &uTruth, Buffer+2, 4 );
+ Extra_ReadHexadecimal( &uTruth, Buffer+2, 5 );
+// uTruth |= (uTruth << 16);
+// uTruth = ~uTruth;
+ Ivy_TruthTestOne( uTruth );
+ }
+ fclose( pFile );
+}
+
+
+
+////////////////////////////////////////////////////////////////////////
+/// END OF FILE ///
+////////////////////////////////////////////////////////////////////////
+
+
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