From c4322a0afd740d85fe850e0811d629627a062403 Mon Sep 17 00:00:00 2001
From: Alan Mishchenko <alanmi@berkeley.edu>
Date: Wed, 6 Dec 2017 10:31:21 -0800
Subject: Switch -a to use only AND-gates in 'twoexact' and 'lutexact'.

---
 src/sat/bmc/bmcMaj2.c | 34 ++++++++++++++++++++++++++--------
 1 file changed, 26 insertions(+), 8 deletions(-)

(limited to 'src/sat/bmc/bmcMaj2.c')

diff --git a/src/sat/bmc/bmcMaj2.c b/src/sat/bmc/bmcMaj2.c
index 46f3f1f2..23b5cf41 100644
--- a/src/sat/bmc/bmcMaj2.c
+++ b/src/sat/bmc/bmcMaj2.c
@@ -538,8 +538,9 @@ static int Exa_ManMarkup( Exa_Man_t * p )
 {
     int i, k, j;
     assert( p->nObjs <= MAJ_NOBJS );
-    // assign variables for truth tables
+    // assign functionality
     p->iVar = 1 + p->nNodes * 3;
+    // assign connectivity variables
     for ( i = p->nVars; i < p->nObjs; i++ )
     {
         for ( k = 0; k < 2; k++ )
@@ -697,7 +698,7 @@ static void Exa_ManPrintSolution( Exa_Man_t * p, int fCompl )
   SeeAlso     []
 
 ***********************************************************************/
-static int Exa_ManAddCnfStart( Exa_Man_t * p )
+static int Exa_ManAddCnfStart( Exa_Man_t * p, int fOnlyAnd )
 {
     int pLits[MAJ_NOBJS], pLits2[2], i, j, k, n, m;
     // input constraints
@@ -743,6 +744,14 @@ static int Exa_ManAddCnfStart( Exa_Man_t * p )
             if ( !sat_solver_addclause( p->pSat, pLits, pLits+3 ) )
                 return 0;
         }
+        if ( fOnlyAnd )
+        {
+            pLits[0] = Abc_Var2Lit( iVarStart,   1 );
+            pLits[1] = Abc_Var2Lit( iVarStart+1, 1 );
+            pLits[2] = Abc_Var2Lit( iVarStart+2, 0 );
+            if ( !sat_solver_addclause( p->pSat, pLits, pLits+3 ) )
+                return 0;
+        }
     }
     // outputs should be used
     for ( i = 0; i < p->nObjs - 1; i++ )
@@ -809,7 +818,7 @@ static int Exa_ManAddCnf( Exa_Man_t * p, int iMint )
     p->iVar += 3*p->nNodes;
     return 1;
 }
-void Exa_ManExactSynthesis2( char * pTtStr, int nVars, int nNodes, int fVerbose )
+void Exa_ManExactSynthesis2( char * pTtStr, int nVars, int nNodes, int fOnlyAnd, int fVerbose )
 {
     int i, status, iMint = 1;
     abctime clkTotal = Abc_Clock();
@@ -818,7 +827,7 @@ void Exa_ManExactSynthesis2( char * pTtStr, int nVars, int nNodes, int fVerbose
     assert( nVars <= 10 );
     p = Exa_ManAlloc( nVars, nNodes, pTruth );
     if ( pTruth[0] & 1 ) { fCompl = 1; Abc_TtNot( pTruth, p->nWords ); }
-    status = Exa_ManAddCnfStart( p );
+    status = Exa_ManAddCnfStart( p, fOnlyAnd );
     assert( status );
     printf( "Running exact synthesis for %d-input function with %d two-input gates...\n", p->nVars, p->nNodes );
     for ( i = 0; iMint != -1; i++ )
@@ -898,8 +907,9 @@ static int Exa3_ManMarkup( Exa3_Man_t * p )
 {
     int i, k, j;
     assert( p->nObjs <= MAJ_NOBJS );
-    // assign variables for truth tables
+    // assign functionality variables
     p->iVar = 1 + p->LutMask * p->nNodes;
+    // assign connectivity variables
     for ( i = p->nVars; i < p->nObjs; i++ )
     {
         for ( k = 0; k < p->nLutSize; k++ )
@@ -1079,7 +1089,7 @@ static void Exa3_ManPrintSolution( Exa3_Man_t * p, int fCompl )
   SeeAlso     []
 
 ***********************************************************************/
-static int Exa3_ManAddCnfStart( Exa3_Man_t * p )
+static int Exa3_ManAddCnfStart( Exa3_Man_t * p, int fOnlyAnd )
 {
     int pLits[MAJ_NOBJS], pLits2[2], i, j, k, n, m;
     // input constraints
@@ -1127,6 +1137,14 @@ static int Exa3_ManAddCnfStart( Exa3_Man_t * p )
             if ( !sat_solver_addclause( p->pSat, pLits, pLits+3 ) )
                 return 0;
         }
+        if ( fOnlyAnd )
+        {
+            pLits[0] = Abc_Var2Lit( iVarStart,   1 );
+            pLits[1] = Abc_Var2Lit( iVarStart+1, 1 );
+            pLits[2] = Abc_Var2Lit( iVarStart+2, 0 );
+            if ( !sat_solver_addclause( p->pSat, pLits, pLits+3 ) )
+                return 0;
+        }
     }
     // outputs should be used
     for ( i = 0; i < p->nObjs - 1; i++ )
@@ -1196,7 +1214,7 @@ static int Exa3_ManAddCnf( Exa3_Man_t * p, int iMint )
     p->iVar += (p->nLutSize+1)*p->nNodes;
     return 1;
 }
-void Exa3_ManExactSynthesis2( char * pTtStr, int nVars, int nNodes, int nLutSize, int fVerbose )
+void Exa3_ManExactSynthesis2( char * pTtStr, int nVars, int nNodes, int nLutSize, int fOnlyAnd, int fVerbose )
 {
     int i, status, iMint = 1;
     abctime clkTotal = Abc_Clock();
@@ -1206,7 +1224,7 @@ void Exa3_ManExactSynthesis2( char * pTtStr, int nVars, int nNodes, int nLutSize
     assert( nLutSize <= 6 );
     p = Exa3_ManAlloc( nVars, nNodes, nLutSize, pTruth );
     if ( pTruth[0] & 1 ) { fCompl = 1; Abc_TtNot( pTruth, p->nWords ); }
-    status = Exa3_ManAddCnfStart( p );
+    status = Exa3_ManAddCnfStart( p, fOnlyAnd );
     assert( status );
     printf( "Running exact synthesis for %d-input function with %d %d-input LUTs...\n", p->nVars, p->nNodes, p->nLutSize );
     for ( i = 0; iMint != -1; i++ )
-- 
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