summaryrefslogtreecommitdiffstats
path: root/src/map/mapper/mapperFanout.c
blob: 63cdbd2aaa476ceff59ef49ed41e25a582768522 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
/**CFile****************************************************************

  FileName    [mapperFanout.c]

  PackageName [FRAIG: Functionally reduced AND-INV graphs.]

  Synopsis    [Procedures to manipulate fanouts of the FRAIG nodes.]

  Author      [Alan Mishchenko <alanmi@eecs.berkeley.edu>]
  
  Affiliation [UC Berkeley]

  Date        [Ver. 2.0. Started - June 1, 2004.]

  Revision    [$Id: mapperFanout.c,v 1.5 2005/01/23 06:59:43 alanmi Exp $]

***********************************************************************/

#include "mapperInt.h"

#ifdef MAP_ALLOCATE_FANOUT

////////////////////////////////////////////////////////////////////////
///                        DECLARATIONS                              ///
////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////
///                     FUNCTION DEFINITIONS                         ///
////////////////////////////////////////////////////////////////////////

/**Function*************************************************************

  Synopsis    [Add the fanout to the node.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
void Map_NodeAddFaninFanout( Map_Node_t * pFanin, Map_Node_t * pFanout )
{
    Map_Node_t * pPivot;

    // pFanins is a fanin of pFanout
    assert( !Map_IsComplement(pFanin) );
    assert( !Map_IsComplement(pFanout) );
    assert( Map_Regular(pFanout->p1) == pFanin || Map_Regular(pFanout->p2) == pFanin );

    pPivot = pFanin->pFanPivot;
    if ( pPivot == NULL )
    {
        pFanin->pFanPivot = pFanout;
        return;
    }

    if ( Map_Regular(pPivot->p1) == pFanin )
    {
        if ( Map_Regular(pFanout->p1) == pFanin )
        {
            pFanout->pFanFanin1 = pPivot->pFanFanin1;
            pPivot->pFanFanin1  = pFanout;
        }
        else // if ( Map_Regular(pFanout->p2) == pFanin )
        {
            pFanout->pFanFanin2 = pPivot->pFanFanin1;
            pPivot->pFanFanin1  = pFanout;
        }
    }
    else // if ( Map_Regular(pPivot->p2) == pFanin )
    {
        assert( Map_Regular(pPivot->p2) == pFanin );
        if ( Map_Regular(pFanout->p1) == pFanin )
        {
            pFanout->pFanFanin1 = pPivot->pFanFanin2;
            pPivot->pFanFanin2  = pFanout;
        }
        else // if ( Map_Regular(pFanout->p2) == pFanin )
        {
            pFanout->pFanFanin2 = pPivot->pFanFanin2;
            pPivot->pFanFanin2  = pFanout;
        }
    }
}

/**Function*************************************************************

  Synopsis    [Add the fanout to the node.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
void Map_NodeRemoveFaninFanout( Map_Node_t * pFanin, Map_Node_t * pFanoutToRemove )
{
    Map_Node_t * pFanout, * pFanout2, ** ppFanList;
    // start the linked list of fanouts
    ppFanList = &pFanin->pFanPivot; 
    // go through the fanouts
    Map_NodeForEachFanoutSafe( pFanin, pFanout, pFanout2 )
    {
        // skip the fanout-to-remove
        if ( pFanout == pFanoutToRemove )
            continue;
        // add useful fanouts to the list
        *ppFanList = pFanout;
        ppFanList = Map_NodeReadNextFanoutPlace( pFanin, pFanout );
    }
    *ppFanList = NULL;
}

/**Function*************************************************************

  Synopsis    [Returns the number of fanouts of a node.]

  Description []
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
int Map_NodeGetFanoutNum( Map_Node_t * pNode )
{
    Map_Node_t * pFanout;
    int Counter = 0;
    Map_NodeForEachFanout( pNode, pFanout )
        Counter++;
    return Counter;
}

////////////////////////////////////////////////////////////////////////
///                       END OF FILE                                ///
////////////////////////////////////////////////////////////////////////

#endif