[14] | 1 | /**CFile*********************************************************************** |
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| 2 | |
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| 3 | FileName [partFine.c] |
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| 4 | |
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| 5 | PackageName [part] |
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| 6 | |
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| 7 | Synopsis [Implements the partition of the network with respect to a |
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| 8 | list of nodes provided by the user.] |
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| 9 | |
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| 10 | Description [The network is composed of an arbitrary set of nodes, each of |
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| 11 | them implementing some function. This partitioning method will produce a |
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| 12 | graph representing the network in which the nodes specified in a list will be |
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| 13 | preserved in the graph structure. Different heuristics will control the |
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| 14 | structure of the rest of the partition.] |
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| 15 | |
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| 16 | SeeAlso [partInOut.c partTotal.c] |
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| 17 | |
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| 18 | Author [HoonSang Jin] |
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| 19 | |
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| 20 | Copyright [This file was created at the University of Colorado at |
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| 21 | Boulder. The University of Colorado at Boulder makes no warranty |
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| 22 | about the suitability of this software for any purpose. It is |
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| 23 | presented on an AS IS basis.] |
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| 24 | |
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| 25 | ******************************************************************************/ |
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| 26 | |
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| 27 | #include "partInt.h" |
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| 28 | |
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| 29 | static char rcsid[] UNUSED = "$Id: partFine.c,v 1.5 2005/04/30 04:00:38 fabio Exp $"; |
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| 30 | |
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| 31 | /*---------------------------------------------------------------------------*/ |
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| 32 | /* Constant declarations */ |
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| 33 | /*---------------------------------------------------------------------------*/ |
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| 34 | |
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| 35 | |
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| 36 | /*---------------------------------------------------------------------------*/ |
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| 37 | /* Structure declarations */ |
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| 38 | /*---------------------------------------------------------------------------*/ |
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| 39 | |
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| 40 | |
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| 41 | /*---------------------------------------------------------------------------*/ |
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| 42 | /* Type declarations */ |
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| 43 | /*---------------------------------------------------------------------------*/ |
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| 44 | |
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| 45 | |
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| 46 | /*---------------------------------------------------------------------------*/ |
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| 47 | /* Variable declarations */ |
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| 48 | /*---------------------------------------------------------------------------*/ |
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| 49 | |
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| 50 | |
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| 51 | /*---------------------------------------------------------------------------*/ |
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| 52 | /* Macro declarations */ |
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| 53 | /*---------------------------------------------------------------------------*/ |
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| 54 | |
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| 55 | #define PartVertexReadGeneric(vPtr) ((PartVertexInfo_t *)(vPtr)->user_data)->generic |
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| 56 | #define PartVertexReadGeneric1(vPtr) ((PartVertexInfo_t *)(vPtr)->user_data)->generic1 |
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| 57 | #define BASIC_PARTITION_UNIT 15 |
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| 58 | |
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| 59 | /**AutomaticStart*************************************************************/ |
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| 60 | |
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| 61 | /*---------------------------------------------------------------------------*/ |
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| 62 | /* Static function prototypes */ |
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| 63 | /*---------------------------------------------------------------------------*/ |
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| 64 | |
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| 65 | static int Part_IsFanoutInverter(Ntk_Node_t *node); |
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| 66 | |
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| 67 | /**AutomaticEnd***************************************************************/ |
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| 68 | |
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| 69 | |
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| 70 | /*---------------------------------------------------------------------------*/ |
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| 71 | /* Definition of exported functions */ |
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| 72 | /*---------------------------------------------------------------------------*/ |
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| 73 | |
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| 74 | |
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| 75 | /*---------------------------------------------------------------------------*/ |
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| 76 | /* Definition of internal functions */ |
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| 77 | /*---------------------------------------------------------------------------*/ |
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| 78 | |
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| 79 | |
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| 80 | /**Function******************************************************************** |
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| 81 | |
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| 82 | Synopsis [Implements the partition with respect to the given list of |
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| 83 | nodes.] |
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| 84 | |
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| 85 | Description [] |
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| 86 | |
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| 87 | SideEffects [] |
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| 88 | |
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| 89 | SeeAlso [PartPartitionTotal PartPartitionInputsOutputs] |
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| 90 | |
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| 91 | ******************************************************************************/ |
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| 92 | void |
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| 93 | PartPartitionFineGrain( |
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| 94 | Ntk_Network_t *network, |
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| 95 | graph_t *partition, |
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| 96 | mdd_t *careSet) |
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| 97 | { |
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| 98 | Ntk_Node_t *node; /* Pointer to iterate over nodes */ |
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| 99 | Mvf_Function_t *mddFunction; /* Pointer to a MDD */ |
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| 100 | mdd_manager *manager; /* Mdd manager in the partition */ |
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| 101 | st_table *tableOfLeaves; /* To store the leaves of the graph */ |
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| 102 | st_table *mddIdToNodeName; /* For quick lookup of node's name */ |
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| 103 | array_t *arrayOfMvf; /* To store the next state functions */ |
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| 104 | array_t *arrayOfRoots; /* To store the roots of the graph */ |
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| 105 | lsList sinkList; /* Vertices representing comb. outputs */ |
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| 106 | lsGen gen; /* To iterate over lists */ |
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| 107 | vertex_t *toVertex; /* Will hold the current function vertex */ |
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| 108 | int i; /* Index for loops */ |
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| 109 | long mddId; /* Will hold the mddId being processed */ |
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| 110 | st_table *mddSupport; /* To store the support of the Mvf_Function */ |
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| 111 | st_generator *stGen; /* To iterate over the MddIds of the support */ |
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| 112 | vertex_t *fromVertex; /* Will hold the current vertex in the support */ |
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| 113 | array_t *singletonMvfArray; |
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| 114 | array_t *singletonArrayOfRoots; |
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| 115 | array_t *tmpArrayOfMvf; |
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| 116 | Mvf_Function_t *nodeMvf; |
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| 117 | lsList sortedListOfNodes; |
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| 118 | array_t *sortedArrayOfPartitionNodes; |
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| 119 | array_t *unsortedArrayOfPartitionNodes; |
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| 120 | st_table *tableOfPartitionNodes; |
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| 121 | Ntk_Node_t *fanin, *fanout; |
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| 122 | |
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| 123 | manager = PartPartitionReadMddManager(partition); |
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| 124 | |
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| 125 | /* Make the combinational input nodes into leaves */ |
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| 126 | tableOfLeaves = st_init_table(st_ptrcmp, st_ptrhash); |
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| 127 | mddIdToNodeName = st_init_table(st_numcmp, st_numhash); |
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| 128 | Ntk_NetworkForEachCombInput(network, gen, node) { |
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| 129 | if(Ntk_NodeReadMddId(node) == NTK_UNASSIGNED_MDD_ID) |
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| 130 | Ord_NetworkAssignMddIdForNode(network, node); |
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| 131 | st_insert(tableOfLeaves, (char *)node, (char *) (long) (-1) ); |
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| 132 | st_insert(mddIdToNodeName, (char *) (long)Ntk_NodeReadMddId(node), |
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| 133 | Ntk_NodeReadName(node)); |
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| 134 | } |
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| 135 | |
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| 136 | unsortedArrayOfPartitionNodes = array_alloc(Ntk_Node_t *, 0); |
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| 137 | tableOfPartitionNodes = st_init_table(st_ptrcmp, st_ptrhash); |
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| 138 | /* Make the target node list for partition */ |
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| 139 | Ntk_NetworkForEachNode(network, gen, node) { |
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| 140 | if(Ntk_NodeTestIsShadow(node)) continue; |
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| 141 | else if(Ntk_NodeTestIsCombInput(node)) continue; |
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| 142 | else if(Ntk_NodeTestIsCombOutput(node)) continue; |
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| 143 | else if(Ntk_NodeReadNumFanouts(node) == 1) { |
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| 144 | fanout = Part_GetFanoutFreeLogic(node); |
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| 145 | if(Ntk_NodeTestIsCombOutput(fanout)); |
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| 146 | else if(Ntk_NodeReadNumFanins(node) > 10); |
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| 147 | else if(Ntk_NodeReadNumFanins(fanout) == 1) continue; |
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| 148 | else if(!Part_CheckLeafNodeCondition(node, tableOfPartitionNodes, 5, 10)) { |
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| 149 | if(Ntk_NodeReadNumFanins(node) == 1) { |
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| 150 | fanin = Part_GetFaninFreeLogic(node); |
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| 151 | if(!fanin) continue; |
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| 152 | if(Ntk_NodeTestIsCombInput(fanin)) continue; |
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| 153 | } |
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| 154 | continue; |
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| 155 | } |
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| 156 | /** |
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| 157 | if(Part_IsFanoutInverter(node)) continue; |
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| 158 | if(Ntk_NodeReadNumFanins(node) == 1) continue; |
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| 159 | **/ |
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| 160 | } |
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| 161 | /** |
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| 162 | else if(Ntk_NodeReadNumFanins(node) == 1) { |
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| 163 | fanin = Part_GetFaninFreeLogic(node); |
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| 164 | if(!fanin) continue; |
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| 165 | if(Ntk_NodeTestIsCombInput(fanin)) continue; |
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| 166 | } |
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| 167 | **/ |
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| 168 | |
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| 169 | array_insert_last(Ntk_Node_t *, unsortedArrayOfPartitionNodes, node); |
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| 170 | st_insert(tableOfPartitionNodes, (char *) node, (char *) (long) (-1)); |
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| 171 | } |
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| 172 | |
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| 173 | /* create sorted array of partition nodes */ |
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| 174 | sortedListOfNodes = Ntk_NetworkComputeTopologicalOrder(network, |
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| 175 | unsortedArrayOfPartitionNodes, tableOfLeaves); |
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| 176 | |
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| 177 | sortedArrayOfPartitionNodes = array_alloc(Ntk_Node_t *, 0); |
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| 178 | lsForEachItem(sortedListOfNodes, gen, node){ |
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| 179 | /* sortedListOfNodes includes many internal nodes, need to filter them out */ |
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| 180 | if(st_is_member(tableOfPartitionNodes, (char *) node)){ |
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| 181 | array_insert_last(Ntk_Node_t *, sortedArrayOfPartitionNodes, node); |
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| 182 | if(Ntk_NodeReadMddId(node) == NTK_UNASSIGNED_MDD_ID) |
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| 183 | Ord_NetworkAssignMddIdForNode(network, node); |
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| 184 | } |
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| 185 | } |
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| 186 | array_free(unsortedArrayOfPartitionNodes); |
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| 187 | lsDestroy(sortedListOfNodes, (void (*)(lsGeneric))0); |
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| 188 | st_free_table(tableOfPartitionNodes); |
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| 189 | |
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| 190 | |
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| 191 | tmpArrayOfMvf = array_alloc(Mvf_Function_t *, 0); |
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| 192 | for(i=0; i < array_n(sortedArrayOfPartitionNodes); i++){ |
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| 193 | node = array_fetch(Ntk_Node_t *, sortedArrayOfPartitionNodes, i); |
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| 194 | singletonArrayOfRoots = array_alloc(Ntk_Node_t *, 0); |
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| 195 | array_insert_last(Ntk_Node_t *, singletonArrayOfRoots, node); |
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| 196 | singletonMvfArray = Ntm_NetworkBuildMvfs(network, singletonArrayOfRoots, |
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| 197 | tableOfLeaves, careSet); |
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| 198 | nodeMvf = array_fetch(Mvf_Function_t *, singletonMvfArray, 0); |
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| 199 | array_insert_last(Mvf_Function_t *, tmpArrayOfMvf, nodeMvf); |
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| 200 | array_free(singletonMvfArray); |
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| 201 | array_free(singletonArrayOfRoots); |
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| 202 | |
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| 203 | if(Ntk_NodeReadMddId(node) == NTK_UNASSIGNED_MDD_ID){ |
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| 204 | Ord_NetworkAssignMddIdForNode(network, node); |
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| 205 | } |
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| 206 | st_insert(tableOfLeaves, (char *)node, (char *) (long) (-1) ); |
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| 207 | st_insert(mddIdToNodeName, (char *) (long)Ntk_NodeReadMddId(node), |
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| 208 | Ntk_NodeReadName(node)); |
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| 209 | |
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| 210 | } |
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| 211 | |
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| 212 | |
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| 213 | arrayOfRoots = array_alloc(Ntk_Node_t *, 0); |
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| 214 | Ntk_NetworkForEachCombOutput(network, gen, node) { |
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| 215 | array_insert_last(Ntk_Node_t *, arrayOfRoots, node); |
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| 216 | } |
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| 217 | arrayOfMvf = Ntm_NetworkBuildMvfs(network, arrayOfRoots, tableOfLeaves, |
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| 218 | careSet); |
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| 219 | |
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| 220 | array_append(arrayOfRoots, sortedArrayOfPartitionNodes); |
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| 221 | array_append(arrayOfMvf, tmpArrayOfMvf); |
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| 222 | array_free(sortedArrayOfPartitionNodes); |
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| 223 | array_free(tmpArrayOfMvf); |
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| 224 | |
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| 225 | |
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| 226 | /* Create one vertex for every component of arrayOfMvf */ |
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| 227 | for (i=0; i < array_n(arrayOfRoots); i++) { |
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| 228 | node = array_fetch(Ntk_Node_t *, arrayOfRoots, i); |
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| 229 | mddId = Ntk_NodeReadMddId(node); |
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| 230 | |
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| 231 | /* obtain the function attached to the node */ |
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| 232 | mddFunction = array_fetch(Mvf_Function_t *, arrayOfMvf, i); |
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| 233 | |
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| 234 | |
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| 235 | toVertex = g_add_vertex(partition); |
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| 236 | |
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| 237 | /* Update the look-up tables in the graph */ |
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| 238 | st_insert(PartPartitionReadNameToVertex(partition), |
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| 239 | Ntk_NodeReadName(node), (char *)toVertex); |
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| 240 | if (mddId != -1) { |
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| 241 | st_insert(PartPartitionReadMddIdToVertex(partition), |
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| 242 | (char *)(long) mddId, (char *)toVertex); |
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| 243 | } |
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| 244 | toVertex->user_data = |
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| 245 | (gGeneric)PartVertexInfoCreateSingle(Ntk_NodeReadName(node), |
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| 246 | mddFunction, |
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| 247 | mddId); |
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| 248 | } |
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| 249 | |
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| 250 | /* Read the list of vertices on the graph */ |
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| 251 | sinkList = lsCopy(g_get_vertices(partition), (lsGeneric (*)(lsGeneric))0); |
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| 252 | |
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| 253 | /* |
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| 254 | * For every function on every combinational output, compute the |
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| 255 | * support and create vertices in the graph when needed |
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| 256 | */ |
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| 257 | lsForEachItem(sinkList, gen, toVertex) { |
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| 258 | mddFunction = PartVertexReadFunction(toVertex); |
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| 259 | mddSupport = PartCreateFunctionSupportTable(mddFunction); |
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| 260 | |
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| 261 | /* |
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| 262 | * Create one edge (and one vertex if necessary) for every element |
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| 263 | * in mddSupport |
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| 264 | */ |
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| 265 | st_foreach_item(mddSupport, stGen, &mddId, NULL) { |
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| 266 | char *name; |
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| 267 | |
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| 268 | /* Create vertex with the information if needed */ |
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| 269 | if (st_lookup(PartPartitionReadMddIdToVertex(partition), |
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| 270 | (char *)(long) mddId, &fromVertex) == 0) { |
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| 271 | fromVertex = g_add_vertex(partition); |
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| 272 | |
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| 273 | st_lookup(mddIdToNodeName, (char *)(long) mddId, &name); |
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| 274 | |
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| 275 | /* Update the look-up tables in the graph */ |
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| 276 | st_insert(PartPartitionReadNameToVertex(partition), |
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| 277 | name, (char *)fromVertex); |
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| 278 | st_insert(PartPartitionReadMddIdToVertex(partition), |
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| 279 | (char *)(long) mddId, (char *)fromVertex); |
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| 280 | |
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| 281 | /* Create vertex data */ |
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| 282 | fromVertex->user_data = |
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| 283 | (gGeneric)PartVertexInfoCreateSingle(name, |
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| 284 | Mvf_FunctionCreateFromVariable(manager,mddId), |
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| 285 | mddId); |
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| 286 | } |
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| 287 | |
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| 288 | /* |
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| 289 | * Add the edge to the graph. Make sure a self loop is not added. The |
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| 290 | * self loop may be produced by a mdd that has in its support the same |
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| 291 | * variables that represent the mddId of the node. |
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| 292 | */ |
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| 293 | if (fromVertex != toVertex) { |
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| 294 | g_add_edge(fromVertex, toVertex); |
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| 295 | } /* End of if */ |
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| 296 | |
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| 297 | } /* End of st_foreach_item */ |
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| 298 | |
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| 299 | /* Clean the support table */ |
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| 300 | st_free_table(mddSupport); |
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| 301 | } /* End of lsForEachItem */ |
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| 302 | |
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| 303 | /* Clean up */ |
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| 304 | st_free_table(mddIdToNodeName); |
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| 305 | st_free_table(tableOfLeaves); |
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| 306 | array_free(arrayOfRoots); |
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| 307 | lsDestroy(sinkList, (void (*)(lsGeneric))0); |
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| 308 | /* |
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| 309 | * The contents of this array (array of mdds) is not deallocated because the |
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| 310 | * information has been transferred to the partition structure. All the |
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| 311 | * functions are stored now as part of the vertex information. |
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| 312 | */ |
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| 313 | array_free(arrayOfMvf); |
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| 314 | fprintf(stdout, "NOTICE : current peak memory = %ld\n", |
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| 315 | bdd_read_peak_memory(manager)); |
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| 316 | |
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| 317 | } /* End of PartPartitionCut */ |
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| 318 | |
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| 319 | |
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| 320 | /**Function******************************************************************** |
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| 321 | |
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| 322 | Synopsis [Check if the fanout of given node is inverter.] |
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| 323 | |
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| 324 | Description [ Check if the fanout of given node is inverter.] |
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| 325 | |
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| 326 | SideEffects [] |
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| 327 | |
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| 328 | SeeAlso [PartPartitionTotal PartPartitionInputsOutputs] |
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| 329 | |
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| 330 | ******************************************************************************/ |
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| 331 | int |
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| 332 | Part_IsFanoutInverter(Ntk_Node_t *node) |
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| 333 | { |
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| 334 | Ntk_Node_t *fanout; |
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| 335 | |
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| 336 | fanout = Part_GetFanoutFreeLogic(node); |
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| 337 | if(!fanout) return(1); |
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| 338 | if(Ntk_NodeReadNumFanins(fanout) == 1) return(1); |
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| 339 | else return(0); |
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| 340 | |
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| 341 | } |
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| 342 | |
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| 343 | /**Function******************************************************************** |
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| 344 | |
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| 345 | Synopsis [Check if the node can be assumed as leaf node based on given threshold.] |
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| 346 | |
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| 347 | Description [ This function identify the leaf node for fine grain partition based on threshold.] |
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| 348 | |
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| 349 | SideEffects [] |
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| 350 | |
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| 351 | SeeAlso [PartPartitionTotal PartPartitionInputsOutputs] |
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| 352 | |
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| 353 | ******************************************************************************/ |
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| 354 | int |
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| 355 | Part_CheckLeafNodeCondition(Ntk_Node_t *node, |
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| 356 | st_table *leafTable, |
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| 357 | int fanoutFreeLimit, |
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| 358 | int numVariableLimit) |
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| 359 | { |
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| 360 | int nVar, nDepth, i; |
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| 361 | Ntk_Node_t *fanout, *tnode, *tfanin; |
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| 362 | st_table *ownTable; |
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| 363 | |
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| 364 | |
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| 365 | nVar = Ntk_NodeReadNumFanins(node); |
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| 366 | nDepth = 0; |
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| 367 | fanout = node; |
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| 368 | ownTable = st_init_table(st_ptrcmp, st_ptrhash); |
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| 369 | while(1) { |
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| 370 | if(nDepth > fanoutFreeLimit)return(1); |
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| 371 | if(nVar > numVariableLimit) return(1); |
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| 372 | |
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| 373 | if(!st_lookup(leafTable, fanout, &tnode)) { |
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| 374 | fanout = Part_GetFanoutFreeLogic(fanout); |
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| 375 | if(fanout == 0) break; |
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| 376 | if(Ntk_NodeTestIsCombInput(fanout)) break; |
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| 377 | if(Ntk_NodeTestIsCombOutput(fanout)) break; |
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| 378 | } |
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| 379 | else break; |
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| 380 | nDepth++; |
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| 381 | if(fanout == 0) break; |
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| 382 | nVar += Img_CutCalcTransitiveFanin(leafTable, ownTable, fanout, |
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| 383 | node, numVariableLimit); |
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| 384 | if(nVar > numVariableLimit) { |
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| 385 | st_free_table(ownTable); |
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| 386 | return(1); |
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| 387 | } |
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| 388 | } |
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| 389 | |
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| 390 | Ntk_NodeForEachFanin(node, i, tfanin) { |
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| 391 | if(tfanin == 0) continue; |
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| 392 | if(Ntk_NodeReadNumFanouts(tfanin) != 1) continue; |
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| 393 | nVar += Img_CutCalcTransitiveFanin(leafTable, ownTable, tfanin, 0, numVariableLimit)-1; |
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| 394 | if(nVar > numVariableLimit) { |
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| 395 | st_free_table(ownTable); |
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| 396 | return(1); |
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| 397 | } |
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| 398 | } |
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| 399 | if(nVar > numVariableLimit) { |
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| 400 | st_free_table(ownTable); |
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| 401 | return(1); |
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| 402 | } |
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| 403 | /** |
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| 404 | fanin = node; |
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| 405 | nDepth = 0; |
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| 406 | while(1) { |
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| 407 | if(nDepth > fanoutFreeLimit)return(1); |
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| 408 | if(nVar > numVariableLimit) return(1); |
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| 409 | if(!st_lookup(leafTable, (char *)fanin, (char **)&tnode)) { |
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| 410 | |
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| 411 | Ntk_NodeForEachFanin(fanin, i, tfanin) { |
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| 412 | if(tfanin == 0) continue; |
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| 413 | if(Ntk_NodeReadNumFanouts(tfanin) != 1) continue; |
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| 414 | nVar += Ntk_NodeReadNumFanins(tfanin) - 1; |
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| 415 | } |
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| 416 | if(nVar > numVariableLimit) return(1); |
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| 417 | |
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| 418 | fanin = Part_GetFaninFreeLogic(fanin); |
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| 419 | if(fanin == 0) break; |
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| 420 | if(Ntk_NodeTestIsCombInput(fanin)) break; |
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| 421 | if(Ntk_NodeTestIsCombOutput(fanin)) break; |
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| 422 | |
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| 423 | } |
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| 424 | else break; |
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| 425 | nDepth++; |
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| 426 | |
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| 427 | } |
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| 428 | **/ |
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| 429 | return(0); |
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| 430 | } |
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| 431 | |
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| 432 | /**Function******************************************************************** |
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| 433 | |
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| 434 | Synopsis [Compute the number of support variables of given node.] |
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| 435 | |
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| 436 | Description [ Compute the number of support variables of given node.] |
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| 437 | |
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| 438 | SideEffects [] |
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| 439 | |
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| 440 | SeeAlso [PartPartitionTotal PartPartitionInputsOutputs] |
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| 441 | |
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| 442 | ******************************************************************************/ |
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| 443 | int |
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| 444 | Img_CutCalcTransitiveFanin(st_table *table, |
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| 445 | st_table *ownTable, |
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| 446 | Ntk_Node_t *node, |
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| 447 | Ntk_Node_t *fanin, |
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| 448 | int limit) |
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| 449 | { |
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| 450 | int i, nVar; |
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| 451 | Ntk_Node_t *tfanin, *tnode; |
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| 452 | |
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| 453 | nVar = 0; |
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| 454 | Ntk_NodeForEachFanin(node, i, tfanin) { |
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| 455 | if(tfanin == fanin) continue; |
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| 456 | if(tfanin == 0) continue; |
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| 457 | if(Ntk_NodeReadNumFanouts(tfanin) != 1){ |
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| 458 | if(!st_lookup(ownTable, tfanin, &tnode)) { |
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| 459 | st_insert(ownTable, tfanin, tfanin); |
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| 460 | nVar++; |
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| 461 | } |
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| 462 | continue; |
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| 463 | } |
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| 464 | if(Ntk_NodeTestIsCombInput(tfanin)) { |
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| 465 | if(!st_lookup(ownTable, tfanin, &tnode)) { |
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| 466 | st_insert(ownTable, tfanin, tfanin); |
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| 467 | nVar++; |
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| 468 | } |
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| 469 | continue; |
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| 470 | } |
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| 471 | if(Ntk_NodeTestIsCombOutput(tfanin)) { |
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| 472 | if(!st_lookup(ownTable, tfanin, &tnode)) { |
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| 473 | st_insert(ownTable, tfanin, tfanin); |
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| 474 | nVar++; |
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| 475 | } |
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| 476 | continue; |
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| 477 | } |
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| 478 | if(!st_lookup(table, tfanin, &tnode)) { |
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| 479 | nVar += Img_CutCalcTransitiveFanin(table, ownTable, tfanin, 0, limit); |
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| 480 | } |
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| 481 | else |
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| 482 | nVar++; |
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| 483 | if(nVar > limit) return(nVar); |
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| 484 | } |
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| 485 | return(nVar); |
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| 486 | } |
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| 487 | |
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| 488 | /**Function******************************************************************** |
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| 489 | |
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| 490 | Synopsis [Check if the fanin of given node is fanout free.] |
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| 491 | |
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| 492 | Description [Check if the fanin of given node is fanout free.] |
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| 493 | |
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| 494 | SideEffects [] |
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| 495 | |
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| 496 | SeeAlso [PartPartitionTotal PartPartitionInputsOutputs] |
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| 497 | |
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| 498 | ******************************************************************************/ |
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| 499 | Ntk_Node_t * |
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| 500 | Part_GetFaninFreeLogic(Ntk_Node_t *node) |
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| 501 | { |
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| 502 | int i; |
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| 503 | Ntk_Node_t *fanin; |
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| 504 | |
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| 505 | Ntk_NodeForEachFanin(node, i, fanin) { |
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| 506 | if(Ntk_NodeReadNumFanouts(fanin) != 1) continue; |
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| 507 | return(fanin); |
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| 508 | } |
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| 509 | return(0); |
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| 510 | } |
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| 511 | |
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| 512 | /**Function******************************************************************** |
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| 513 | |
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| 514 | Synopsis [Check if the fanout of given node is fanout free.] |
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| 515 | |
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| 516 | Description [Check if the fanout of given node is fanout free.] |
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| 517 | |
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| 518 | SideEffects [] |
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| 519 | |
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| 520 | SeeAlso [PartPartitionTotal PartPartitionInputsOutputs] |
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| 521 | |
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| 522 | ******************************************************************************/ |
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| 523 | Ntk_Node_t * |
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| 524 | Part_GetFanoutFreeLogic(Ntk_Node_t *node) |
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| 525 | { |
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| 526 | int i; |
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| 527 | Ntk_Node_t *fanout; |
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| 528 | |
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| 529 | if(Ntk_NodeReadNumFanouts(node) != 1) return(0); |
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| 530 | Ntk_NodeForEachFanout(node, i, fanout) { |
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| 531 | return(fanout); |
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| 532 | } |
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| 533 | return(0); |
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| 534 | } |
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