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diff --git a/src/sat/xsat/xsatUtils.h b/src/sat/xsat/xsatUtils.h
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+/**CFile****************************************************************
+
+  FileName    [xsatUtils.h]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [xSAT - A SAT solver written in C.
+               Read the license file for more info.]
+
+  Synopsis    [Utility functions used in xSAT]
+
+  Author      [Bruno Schmitt <boschmitt@inf.ufrgs.br>]
+
+  Affiliation [UC Berkeley / UFRGS]
+
+  Date        [Ver. 1.0. Started - November 10, 2016.]
+
+  Revision    []
+
+***********************************************************************/
+#ifndef ABC__sat__xSAT__xsatUtils_h
+#define ABC__sat__xSAT__xsatUtils_h
+
+////////////////////////////////////////////////////////////////////////
+///                          INCLUDES                                ///
+////////////////////////////////////////////////////////////////////////
+#include "misc/util/abc_global.h"
+
+ABC_NAMESPACE_HEADER_START
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline void xSAT_UtilSelectSort( void** pArray, int nSize, int(* CompFnct )( const void *, const void * ) )
+{
+    int i, j, iBest;
+    void* pTmp;
+
+    for ( i = 0; i < ( nSize - 1 ); i++ )
+    {
+        iBest = i;
+        for ( j = i + 1; j < nSize; j++ )
+        {
+            if ( CompFnct( pArray[j], pArray[iBest] ) )
+                iBest = j;
+        }
+        pTmp = pArray[i];
+        pArray[i] = pArray[iBest];
+        pArray[iBest] = pTmp;
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static void xSAT_UtilSort( void** pArray, int nSize, int(* CompFnct )( const void *, const void *) )
+{
+    if ( nSize <= 15 )
+        xSAT_UtilSelectSort( pArray, nSize, CompFnct );
+    else
+    {
+        void* pPivot = pArray[nSize / 2];
+        void* pTmp;
+        int i = -1;
+        int j = nSize;
+
+        for(;;)
+        {
+            do i++; while( CompFnct( pArray[i], pPivot ) );
+            do j--; while( CompFnct( pPivot, pArray[j] ) );
+
+            if ( i >= j )
+                break;
+
+            pTmp = pArray[i];
+            pArray[i] = pArray[j];
+            pArray[j] = pTmp;
+        }
+
+        xSAT_UtilSort( pArray, i, CompFnct );
+        xSAT_UtilSort( pArray + i, ( nSize - i ), CompFnct );
+    }
+}
+
+ABC_NAMESPACE_HEADER_END
+
+#endif
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////