From aae37ffd4ce42d64677fc9ab51ad98ec3ab2aae0 Mon Sep 17 00:00:00 2001
From: Alan Mishchenko <alanmi@berkeley.edu>
Date: Wed, 6 Jun 2018 14:17:52 -0700
Subject: Experiments with path enumeration.

---
 src/misc/extra/extraUtilPath.c | 115 +++++++++++++++++++++++++++++++++++++++++
 src/misc/extra/module.make     |   1 +
 2 files changed, 116 insertions(+)
 create mode 100644 src/misc/extra/extraUtilPath.c

(limited to 'src/misc/extra')

diff --git a/src/misc/extra/extraUtilPath.c b/src/misc/extra/extraUtilPath.c
new file mode 100644
index 00000000..39819199
--- /dev/null
+++ b/src/misc/extra/extraUtilPath.c
@@ -0,0 +1,115 @@
+/**CFile****************************************************************
+
+  FileName    [extraUtilPath.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [extra]
+
+  Synopsis    [Path enumeration.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 20, 2005.]
+
+  Revision    [$Id: extraUtilPath.c,v 1.0 2003/02/01 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include "aig/gia/gia.h"
+
+ABC_NAMESPACE_IMPL_START
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Computes AIG representing the set of all paths in the graph.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Abc_NodeVarX( int nSize, int y, int x )
+{
+    return Abc_Var2Lit( nSize * y + x, 0 );
+}
+int Abc_NodeVarY( int nSize, int y, int x )
+{
+    return Abc_Var2Lit( nSize * (nSize + 1) + nSize * x + y, 0 );
+}
+
+Gia_Man_t * Abc_EnumeratePaths( int nSize )
+{
+    Gia_Man_t * pTemp, * pGia = Gia_ManStart( 10000 );
+    int * pNodes = ABC_CALLOC( int, nSize+1 );
+    int x, y, nVars = 2*nSize*(nSize+1);
+    for ( x = 0; x < nVars; x++ )
+        Gia_ManAppendCi( pGia );
+    Gia_ManHashAlloc( pGia );
+    // y = 0; x = 0;
+    pNodes[0] = 1;
+    // y = 0; x > 0 
+    for ( x = 1; x <= nSize; x++ )
+        pNodes[x] = Gia_ManHashAnd( pGia, pNodes[x-1], Abc_NodeVarX(nSize, 0, x) );
+    // y > 0; x >= 0
+    for ( y = 1; y <= nSize; y++ )
+    {
+        // y > 0; x = 0
+        pNodes[0] = Gia_ManHashAnd( pGia, pNodes[0], Abc_NodeVarY(nSize, y, 0) );
+        // y > 0; x > 0
+        for ( x = 1; x <= nSize; x++ )
+        {
+            int iHor  = Gia_ManHashAnd( pGia, pNodes[x-1], Abc_NodeVarX(nSize, y, x) );
+            int iVer  = Gia_ManHashAnd( pGia, pNodes[x],   Abc_NodeVarY(nSize, y, x) );
+            pNodes[x] = Gia_ManHashOr( pGia, iHor, iVer );
+        }
+    }
+    Gia_ManAppendCo( pGia, pNodes[nSize] );
+    pGia = Gia_ManCleanup( pTemp = pGia );
+    Gia_ManStop( pTemp );
+    ABC_FREE( pNodes );
+    return pGia;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Abc_EnumeratePathsTest()
+{
+    int nSize = 2;
+    Gia_Man_t * pGia = Abc_EnumeratePaths( nSize );
+    Gia_AigerWrite( pGia, "testpath.aig", 0, 0 );
+    Gia_ManStop( pGia );
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
+ABC_NAMESPACE_IMPL_END
+
diff --git a/src/misc/extra/module.make b/src/misc/extra/module.make
index c8d70f26..6ec0c6e5 100644
--- a/src/misc/extra/module.make
+++ b/src/misc/extra/module.make
@@ -7,6 +7,7 @@ SRC +=    src/misc/extra/extraUtilBitMatrix.c \
     src/misc/extra/extraUtilMemory.c \
     src/misc/extra/extraUtilMisc.c \
     src/misc/extra/extraUtilMult.c \
+    src/misc/extra/extraUtilPath.c \
     src/misc/extra/extraUtilPerm.c \
     src/misc/extra/extraUtilProgress.c \
     src/misc/extra/extraUtilReader.c \
-- 
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