From 94f6bfef8d40c15bb386cde279203991f2d6c3dd Mon Sep 17 00:00:00 2001
From: Alan Mishchenko <alanmi@berkeley.edu>
Date: Wed, 1 Aug 2018 18:51:42 -0800
Subject: Experiments with function enumeration.

---
 src/opt/dau/dauNpn.c    | 267 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/opt/dau/module.make |   1 +
 2 files changed, 268 insertions(+)
 create mode 100644 src/opt/dau/dauNpn.c

(limited to 'src/opt')

diff --git a/src/opt/dau/dauNpn.c b/src/opt/dau/dauNpn.c
new file mode 100644
index 00000000..9adf5655
--- /dev/null
+++ b/src/opt/dau/dauNpn.c
@@ -0,0 +1,267 @@
+/**CFile****************************************************************
+
+  FileName    [dau.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [DAG-aware unmapping.]
+
+  Synopsis    []
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 20, 2005.]
+
+  Revision    [$Id: dau.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "dauInt.h"
+#include "misc/util/utilTruth.h"
+#include "misc/extra/extra.h"
+
+ABC_NAMESPACE_IMPL_START
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+//#define USE4VARS 1
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+ 
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Dau_TruthEnum()
+{
+    int fUseTable = 1;
+    abctime clk = Abc_Clock();
+#ifdef USE4VARS
+    int nVars   = 4;
+    int nSizeW  = 1 << 14;
+    char * pFileName = "tableW14.data";
+#else
+    int nVars   = 5;
+    int nSizeW  = 1 << 30;
+    char * pFileName = "tableW30.data";
+#endif
+    int nPerms  = Extra_Factorial( nVars );
+    int nMints  = 1 << nVars;
+    int * pPerm = Extra_PermSchedule( nVars );
+    int * pComp = Extra_GreyCodeSchedule( nVars );
+    word nFuncs = ((word)1 << (((word)1 << nVars)-1));
+    word * pPres = ABC_CALLOC( word, 1 << ((1<<nVars)-7) );
+    unsigned * pTable = fUseTable ? (unsigned *)ABC_CALLOC(word, nSizeW) : NULL;
+    Vec_Int_t * vNpns = Vec_IntAlloc( 1000 );
+    word tMask = Abc_Tt6Mask( 1 << nVars );
+    word tTemp, tCur;
+    int i, k;
+    if ( pPres == NULL )
+    {
+        printf( "Cannot alloc memory for marks.\n" );
+        return;
+    }
+    if ( pTable == NULL )
+        printf( "Cannot alloc memory for table.\n" );
+    for ( tCur = 0; tCur < nFuncs; tCur++ )
+    {
+        if ( (tCur & 0xFFFFFF) == 0 )
+            printf( "Finished %08x\n", tCur );
+        if ( Abc_TtGetBit(pPres, (int)tCur) )
+            continue;
+        //Extra_PrintBinary( stdout, (unsigned *)&tCur, 16 ); printf( " %04x\n", (int)tCur );
+        //Dau_DsdPrintFromTruth( &tCur, 4 ); printf( "\n" );
+        Vec_IntPush( vNpns, (int)tCur );
+        tTemp = tCur;
+        for ( i = 0; i < nPerms; i++ )
+        {
+            for ( k = 0; k < nMints; k++ )
+            {
+                if ( tCur < nFuncs )
+                {
+                    if ( pTable ) pTable[(int)tCur] = tTemp;
+                    Abc_TtSetBit( pPres, (int)tCur );
+                }
+                if ( (tMask & ~tCur) < nFuncs )
+                {
+                    if ( pTable ) pTable[(int)(tMask & ~tCur)] = tTemp;
+                    Abc_TtSetBit( pPres, (int)(tMask & ~tCur) );
+                }
+                tCur = Abc_Tt6Flip( tCur, pComp[k] );
+            }
+            tCur = Abc_Tt6SwapAdjacent( tCur, pPerm[i] );
+        }
+        assert( tTemp == tCur );
+    }
+    printf( "Computed %d NPN classes of %d variables.  ", Vec_IntSize(vNpns), nVars );
+    Abc_PrintTime( 1, "Time", Abc_Clock() - clk );
+    Vec_IntFree( vNpns );
+    ABC_FREE( pPres );
+    ABC_FREE( pPerm );
+    ABC_FREE( pComp );
+    // write into file
+    if ( pTable )
+    {
+        FILE * pFile = fopen( pFileName, "wb" );
+        fwrite( pTable, 8, nSizeW, pFile );
+        fclose( pFile );
+        ABC_FREE( pTable );
+    }
+}
+
+ 
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+unsigned * Dau_ReadFile( char * pFileName, int nSizeW )
+{
+    FILE * pFile = fopen( pFileName, "rb" );
+    unsigned * p = (unsigned *)ABC_CALLOC(word, nSizeW);
+    fread( p, sizeof(word), nSizeW, pFile );
+    fclose( pFile );
+    return p;
+}
+void Dau_AddFunction( word tCur, int nVars, unsigned * pTable, Vec_Int_t * vNpns )
+{
+    int Digit  = (1 << nVars)-1;
+    word tMask = Abc_Tt6Mask( 1 << nVars );
+    word tNorm = (tCur >> Digit) & 1 ? ~tCur : tCur;
+    unsigned t = (unsigned)tNorm & tMask;
+    unsigned tRep  = pTable[t];
+    unsigned tRep2 = pTable[tRep & tMask];
+    assert( ((tNorm >> Digit) & 1) == 0 );
+    assert( (tRep & tMask) == (tRep2 & tMask) );
+    if ( (tRep2 >> 31) == 0 ) // first time
+    {
+        Vec_IntPush( vNpns, tRep2 );
+        pTable[tRep2] |= (1 << 31);
+    }
+}
+void Dau_NetworkEnum()
+{
+    abctime clk = Abc_Clock();
+#ifdef USE4VARS
+    int nVars = 4;
+    int nSizeW  = 1 << 14;
+    char * pFileName = "tableW14.data";
+#else
+    int nVars = 5;
+    int nSizeW  = 1 << 30;
+    char * pFileName = "tableW30.data";
+#endif
+    unsigned * pTable = Dau_ReadFile( pFileName, nSizeW );
+    Vec_Int_t * vNpns = Vec_IntAlloc( 1000 );
+    int i, v, g, k, m, Entry, Count = 1, iPrev = 0, iLast = 1;
+    unsigned Inv = (unsigned)Abc_Tt6Mask(1 << (nVars-1));
+    pTable[0]   |= (1 << 31);
+    pTable[Inv] |= (1 << 31);
+    Vec_IntPushTwo( vNpns, 0, Inv );
+    Vec_IntForEachEntryStart( vNpns, Entry, i, 1 )
+    {
+        word uTruth = (((word)Entry) << 32) | (word)Entry;
+        int nSupp = Abc_TtSupportSize( &uTruth, nVars );
+        //printf( "Exploring function %4d with %d vars: ", i, nSupp );
+        //printf( " %04x\n", (int)uTruth );
+        //Dau_DsdPrintFromTruth( &uTruth, 4 );
+        for ( v = 0; v < nSupp; v++ )
+        {
+            word Cof0 = Abc_Tt6Cofactor0( uTruth, nVars-1-v );
+            word Cof1 = Abc_Tt6Cofactor1( uTruth, nVars-1-v );
+            for ( g = 0; g < 2; g++ )
+            {
+                if ( nSupp < nVars )
+                {
+                    word tGate = g ? s_Truths6[nVars-1-v] ^ s_Truths6[nVars-1-nSupp] : s_Truths6[nVars-1-v] & s_Truths6[nVars-1-nSupp];
+                    word tCur  = (tGate & Cof1) | (~tGate & Cof0);
+                    Dau_AddFunction( tCur, nVars, pTable, vNpns );
+                }
+            }
+            for ( g = 0; g < 2; g++ )
+            {
+                // add one cross bar
+                for ( k = 0; k < nSupp; k++ ) if ( k != v )
+                {
+                    word tGate = g ? s_Truths6[nVars-1-v] ^ s_Truths6[nVars-1-k] : s_Truths6[nVars-1-v] & s_Truths6[nVars-1-k];
+                    word tCur  = (tGate & Cof1) | (~tGate & Cof0);
+                    Dau_AddFunction( tCur, nVars, pTable, vNpns );
+                    if ( g == 0 ) // skip XOR
+                    {
+                        word tGate = s_Truths6[nVars-1-v] & ~s_Truths6[nVars-1-k];
+                        word tCur  = (tGate & Cof1) | (~tGate & Cof0);
+                        Dau_AddFunction( tCur, nVars, pTable, vNpns );
+                    }
+                }
+            }
+            for ( g = 0; g < 2; g++ )
+            {
+                // add two cross bars
+                for ( k = 0;   k < nSupp; k++ ) if ( k != v )
+                for ( m = k+1; m < nSupp; m++ ) if ( m != v )
+                {
+                    word tGate = g ? s_Truths6[nVars-1-m] ^ s_Truths6[nVars-1-k] : s_Truths6[nVars-1-m] & s_Truths6[nVars-1-k];
+                    word tCur  = (tGate & Cof1) | (~tGate & Cof0);
+                    Dau_AddFunction( tCur, nVars, pTable, vNpns );
+                    if ( g == 0 ) // skip XOR
+                    {
+                        tGate =  s_Truths6[nVars-1-m] & ~s_Truths6[nVars-1-k];
+                        tCur  = (tGate & Cof1) | (~tGate & Cof0);
+                        Dau_AddFunction( tCur, nVars, pTable, vNpns );
+
+                        tGate = ~s_Truths6[nVars-1-m] &  s_Truths6[nVars-1-k];
+                        tCur  = (tGate & Cof1) | (~tGate & Cof0);
+                        Dau_AddFunction( tCur, nVars, pTable, vNpns );
+
+                        tGate = ~s_Truths6[nVars-1-m] & ~s_Truths6[nVars-1-k];
+                        tCur  = (tGate & Cof1) | (~tGate & Cof0);
+                        Dau_AddFunction( tCur, nVars, pTable, vNpns );
+                    }
+                }
+            }
+        }
+        if ( i == iLast )
+        {
+            //printf("Finished %d nodes with %d functions.\n", Count++, Vec_IntSize(vNpns) );
+            iPrev = iLast;
+            iLast = Vec_IntSize(vNpns)-1;
+            printf("Finished %d nodes with %d functions.\n", Count++, iLast - iPrev );
+        }
+    }
+    Vec_IntFree( vNpns );
+    ABC_FREE( pTable );
+    Abc_PrintTime( 1, "Time", Abc_Clock() - clk );
+}
+void Dau_NetworkEnumTest()
+{
+    Dau_TruthEnum();
+    Dau_NetworkEnum();
+}
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
+ABC_NAMESPACE_IMPL_END
+
diff --git a/src/opt/dau/module.make b/src/opt/dau/module.make
index 9e89d732..efc34a17 100644
--- a/src/opt/dau/module.make
+++ b/src/opt/dau/module.make
@@ -7,4 +7,5 @@ SRC +=    src/opt/dau/dauCanon.c \
     src/opt/dau/dauGia.c \
     src/opt/dau/dauMerge.c \
     src/opt/dau/dauNonDsd.c \
+    src/opt/dau/dauNpn.c \
     src/opt/dau/dauTree.c
-- 
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