Version abc50904

1 files changed, 90 insertions, 0 deletions

diff --git a/src/misc/mvc/mvcDivisor.c b/src/misc/mvc/mvcDivisor.c
new file mode 100644
index 00000000..e92c3a65
--- /dev/null
+++ b/src/misc/mvc/mvcDivisor.c
@@ -0,0 +1,90 @@
+/**CFile****************************************************************
+
+  FileName    [mvcDivisor.c]
+
+  PackageName [MVSIS 2.0: Multi-valued logic synthesis system.]
+
+  Synopsis    [Procedures for compute the quick divisor.]
+
+  Author      [MVSIS Group]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - February 1, 2003.]
+
+  Revision    [$Id: mvcDivisor.c,v 1.1 2003/04/03 15:34:08 alanmi Exp $]
+
+***********************************************************************/
+
+#include "mvc.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+static void  Mvc_CoverDivisorZeroKernel( Mvc_Cover_t * pCover );
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFITIONS                           ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the quick divisor of the cover.]
+
+  Description [Returns NULL, if there is not divisor other than
+  trivial.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Mvc_Cover_t * Mvc_CoverDivisor( Mvc_Cover_t * pCover )
+{
+    Mvc_Cover_t * pKernel;
+    if ( Mvc_CoverReadCubeNum(pCover) <= 1 )
+        return NULL;
+    // allocate the literal array and count literals
+    if ( Mvc_CoverAnyLiteral( pCover, NULL ) == -1 )
+        return NULL;
+    // duplicate the cover
+    pKernel = Mvc_CoverDup(pCover);
+    // perform the kerneling
+    Mvc_CoverDivisorZeroKernel( pKernel );
+    assert( Mvc_CoverReadCubeNum(pKernel) );
+    return pKernel;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes a level-zero kernel.]
+
+  Description [Modifies the cover to contain one level-zero kernel.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Mvc_CoverDivisorZeroKernel( Mvc_Cover_t * pCover )
+{
+    int iLit;
+    // find any literal that occurs at least two times
+//    iLit = Mvc_CoverAnyLiteral( pCover, NULL );
+    iLit = Mvc_CoverWorstLiteral( pCover, NULL );
+//    iLit = Mvc_CoverBestLiteral( pCover, NULL );
+    if ( iLit == -1 )
+        return;
+    // derive the cube-free quotient
+    Mvc_CoverDivideByLiteralQuo( pCover, iLit ); // the same cover
+    Mvc_CoverMakeCubeFree( pCover );             // the same cover
+    // call recursively
+    Mvc_CoverDivisorZeroKernel( pCover );              // the same cover
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+