[14] | 1 | /**CFile*********************************************************************** |
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| 2 | |
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| 3 | FileName [synthOpt.c] |
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| 4 | |
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| 5 | PackageName [synth] |
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| 6 | |
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| 7 | Synopsis [Multilevel optimization functions.] |
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| 8 | |
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| 9 | Author [In-Ho Moon, Balakrishna Kumthekar] |
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| 10 | |
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| 11 | Copyright [This file was created at the University of Colorado at Boulder. |
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| 12 | The University of Colorado at Boulder makes no warranty about the suitability |
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| 13 | of this software for any purpose. It is presented on an AS IS basis.] |
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| 14 | |
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| 15 | ******************************************************************************/ |
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| 16 | |
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| 17 | #include "synthInt.h" |
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| 18 | |
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| 19 | static char rcsid[] UNUSED = "$Id: synthOpt.c,v 1.53 2005/05/11 20:18:25 hhhan Exp $"; |
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| 20 | |
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| 21 | /*---------------------------------------------------------------------------*/ |
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| 22 | /* Constant declarations */ |
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| 23 | /*---------------------------------------------------------------------------*/ |
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| 24 | |
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| 25 | |
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| 26 | /*---------------------------------------------------------------------------*/ |
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| 27 | /* Type declarations */ |
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| 28 | /*---------------------------------------------------------------------------*/ |
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| 29 | |
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| 30 | |
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| 31 | /*---------------------------------------------------------------------------*/ |
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| 32 | /* Structure 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 | /* Variable declarations */ |
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| 38 | /*---------------------------------------------------------------------------*/ |
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| 39 | |
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| 40 | int OutputOrdering = 1; /* |
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| 41 | ** 0 : just use VIS's order |
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| 42 | ** 1 : smaller first in terms of support |
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| 43 | ** 2 : smaller first in terms of bdd size |
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| 44 | */ |
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| 45 | |
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| 46 | static int UseFuncDivisor = 1; |
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| 47 | static float SuppFactor = 10.0; |
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| 48 | static float ProbFactor = 10.0; |
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| 49 | static int *SupportCount; |
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| 50 | static float *Probability; |
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| 51 | static char **outputNames; |
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| 52 | |
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| 53 | extern int TryNodeSharing; |
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| 54 | extern int noMemoryFlag; |
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| 55 | extern int VerifyTreeMode; |
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| 56 | |
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| 57 | /**AutomaticStart*************************************************************/ |
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| 58 | |
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| 59 | /*---------------------------------------------------------------------------*/ |
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| 60 | /* Static function prototypes */ |
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| 61 | /*---------------------------------------------------------------------------*/ |
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| 62 | |
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| 63 | static void GetOutputOrder(bdd_manager *dd, bdd_node **ofuncs, int no, int *order, int verbosity); |
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| 64 | static int IsSubsetOfSupportForOneWord(unsigned int mask1, unsigned int mask2); |
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| 65 | static int IsNullSupport(int size, unsigned int *mask); |
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| 66 | static void PrintSupportMask(int n, int size, unsigned int *mask); |
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| 67 | static int GetNumberOfSupport(int n, int size, unsigned int *mask); |
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| 68 | static int factorizeNetwork(Ntk_Network_t *net, bdd_manager *dd, bdd_node **ofuncs, MlTree **tree, int no, int *out_order, st_table *table, char **combOutNames, int divisor, MlTree *(* factoring_func)(bdd_manager *, st_table *, bdd_node *, int, int *, MlTree *, int, MlTree *, int), int verbosity); |
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| 69 | |
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| 70 | /**AutomaticEnd***************************************************************/ |
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| 71 | |
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| 72 | |
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| 73 | /*---------------------------------------------------------------------------*/ |
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| 74 | /* Definition of exported functions */ |
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| 75 | /*---------------------------------------------------------------------------*/ |
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| 76 | |
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| 77 | |
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| 78 | /*---------------------------------------------------------------------------*/ |
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| 79 | /* Definition of internal functions */ |
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| 80 | /*---------------------------------------------------------------------------*/ |
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| 81 | |
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| 82 | /**Function******************************************************************** |
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| 83 | |
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| 84 | Synopsis [Optimizes a network by factorizing.] |
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| 85 | |
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| 86 | Description [Optimizes a network by factorizing.] |
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| 87 | |
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| 88 | SideEffects [] |
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| 89 | |
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| 90 | SeeAlso [] |
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| 91 | |
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| 92 | ******************************************************************************/ |
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| 93 | void |
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| 94 | SynthMultiLevelOptimize(Ntk_Network_t *network, |
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| 95 | bdd_node **combOutBdds, |
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| 96 | bdd_node **combUpperBdds, |
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| 97 | char **combOutNames, |
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| 98 | int *initStates, |
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| 99 | Synth_InfoData_t *synthInfo, |
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| 100 | int verbosity) |
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| 101 | { |
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| 102 | bdd_manager *dd = (bdd_manager *)Ntk_NetworkReadMddManager(network); |
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| 103 | bdd_node *top; |
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| 104 | bdd_node **ofuncs; |
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| 105 | int i, no; |
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| 106 | int factoring, divisor; |
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| 107 | char *filename; |
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| 108 | char *filehead; |
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| 109 | MlTree **tree; |
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| 110 | bdd_node *zdd_I; |
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| 111 | st_table *table; |
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| 112 | int nml, tml; |
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| 113 | int *out_order; |
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| 114 | FILE *feqn; |
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| 115 | MlTree *(* factoring_func)(bdd_manager *, st_table *, |
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| 116 | bdd_node *, int, int *, MlTree *, |
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| 117 | int, MlTree *, int); |
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| 118 | int autoDyn, autoDynZ; |
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| 119 | bdd_reorder_type_t method, methodZ; |
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| 120 | int error; |
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| 121 | |
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| 122 | factoring = synthInfo->factoring; |
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| 123 | divisor = synthInfo->divisor; |
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| 124 | filehead = synthInfo->filehead; |
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| 125 | TryNodeSharing = synthInfo->trySharing; |
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| 126 | SynthSetInternalNodePrefix(synthInfo->prefix); |
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| 127 | |
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| 128 | /* Save reordering status and set reordering mode specific to |
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| 129 | * synthesis. |
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| 130 | */ |
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| 131 | autoDyn = bdd_reordering_status(dd, &method); |
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| 132 | autoDynZ = bdd_reordering_zdd_status(dd, &methodZ); |
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| 133 | |
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| 134 | switch (synthInfo->reordering) { |
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| 135 | case 0 : |
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| 136 | bdd_dynamic_reordering_disable(dd); |
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| 137 | bdd_dynamic_reordering_zdd_disable(dd); |
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| 138 | break; |
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| 139 | case 1 : |
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| 140 | bdd_dynamic_reordering(dd, method, BDD_REORDER_VERBOSITY_DEFAULT); |
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| 141 | bdd_dynamic_reordering_zdd_disable(dd); |
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| 142 | break; |
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| 143 | case 2 : |
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| 144 | bdd_dynamic_reordering_disable(dd); |
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| 145 | bdd_dynamic_reordering_zdd(dd, methodZ, BDD_REORDER_VERBOSITY_DEFAULT); |
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| 146 | break; |
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| 147 | case 3 : |
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| 148 | bdd_dynamic_reordering(dd, method, BDD_REORDER_VERBOSITY_DEFAULT); |
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| 149 | bdd_dynamic_reordering_zdd(dd, methodZ, BDD_REORDER_VERBOSITY_DEFAULT); |
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| 150 | break; |
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| 151 | default : |
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| 152 | bdd_dynamic_reordering_disable(dd); |
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| 153 | bdd_dynamic_reordering_zdd_disable(dd); |
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| 154 | break; |
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| 155 | } |
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| 156 | |
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| 157 | if (factoring == 0) |
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| 158 | factoring_func = SynthSimpleFactorTree; |
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| 159 | else |
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| 160 | factoring_func = SynthGenericFactorTree; |
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| 161 | |
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| 162 | /* outputNames is a static global variable for this file. */ |
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| 163 | outputNames = combOutNames; |
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| 164 | |
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| 165 | /* Initialize the node-tree table and other factoring-related variables. |
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| 166 | * The table contains pairs of a ZDD node and the corresponding multi-level |
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| 167 | * tree. |
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| 168 | */ |
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| 169 | table = st_init_table(st_ptrcmp, st_ptrhash); |
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| 170 | SynthInitMlTable(); |
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| 171 | |
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| 172 | /* Create ZDD variables for the positive and negative literals. */ |
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| 173 | bdd_zdd_vars_from_bdd_vars(dd, 2); |
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| 174 | |
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| 175 | /* Since we currently support only blif files, the number of |
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| 176 | * functions to synthesize should not include the initial |
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| 177 | * inputs of latches in case of sequential ckts. |
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| 178 | */ |
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| 179 | no = Ntk_NetworkReadNumCombOutputs(network) - |
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| 180 | Ntk_NetworkReadNumLatches(network); |
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| 181 | |
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| 182 | /* Compute two-level covers for all the functions to be synthesized. */ |
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| 183 | ofuncs = ALLOC(bdd_node *, no); |
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| 184 | for (i = 0; i < no; i++) { |
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| 185 | if (verbosity) { |
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| 186 | (void)fprintf(vis_stdout, "** synth info: Synthesizing output [%d(%s)]\n", |
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| 187 | i, combOutNames[i]); |
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| 188 | } |
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| 189 | bdd_ref(top = bdd_zdd_isop(dd, combOutBdds[i], combUpperBdds[i], |
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| 190 | &zdd_I)); |
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| 191 | bdd_ref(zdd_I); |
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| 192 | bdd_recursive_deref(dd, top); |
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| 193 | ofuncs[i] = zdd_I; |
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| 194 | } |
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| 195 | |
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| 196 | if (VerifyTreeMode == 2) |
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| 197 | SynthDumpBlif(network, dd, no, ofuncs, combOutNames, initStates, filehead); |
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| 198 | |
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| 199 | /* Initialize array of factoring trees and determine the order in |
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| 200 | * which the functions will be processed. Then proceed to factor. |
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| 201 | */ |
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| 202 | tree = ALLOC(MlTree *, no); |
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| 203 | (void)memset((void *)tree, 0, no * sizeof(MlTree *)); |
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| 204 | out_order = ALLOC(int, no); |
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| 205 | GetOutputOrder(dd, ofuncs, no, out_order, verbosity); |
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| 206 | error = factorizeNetwork(network, dd, ofuncs, tree, no, out_order, |
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| 207 | table, combOutNames, divisor, factoring_func, verbosity); |
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| 208 | FREE(out_order); |
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| 209 | |
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| 210 | if (error) { |
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| 211 | (void)fprintf(vis_stderr, |
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| 212 | "** synth error: synthesize_network has finished abnormally"); |
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| 213 | if (noMemoryFlag) |
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| 214 | (void)fprintf(vis_stderr, " due to lack of memory\n"); |
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| 215 | else |
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| 216 | (void)fprintf(vis_stderr, " for some reason\n"); |
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| 217 | goto cleanup; |
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| 218 | } |
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| 219 | |
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| 220 | /* Count total number of literals in multi-level network. */ |
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| 221 | tml = 0; |
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| 222 | for (i = 0; i < no; i++) { |
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| 223 | if (tree[i]) { |
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| 224 | nml = SynthCountMlLiteral(dd, tree[i], 1); |
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| 225 | tml += nml; |
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| 226 | } |
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| 227 | } |
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| 228 | (void)fprintf(vis_stdout, |
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| 229 | "** synth info: Total number of literals = %d\n", tml); |
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| 230 | |
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| 231 | /* Write network in eqn and blif formats. */ |
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| 232 | SynthSetupNodeNameTable(network); |
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| 233 | filename = ALLOC(char, strlen(filehead) + 9); |
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| 234 | if (synthInfo->eqn) { |
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| 235 | sprintf(filename, "%s.eqn", filehead); |
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| 236 | feqn = Cmd_FileOpen(filename, "w", NIL(char *), 0); |
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| 237 | if (feqn) { |
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| 238 | fprintf(feqn, "** synth info: Total number of literals = %d\n", tml); |
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| 239 | SynthWriteEqnHeader(feqn, network, dd); |
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| 240 | for (i = 0; i < no; i++) { |
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| 241 | if (tree[i]) |
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| 242 | SynthWriteEqn(feqn, network, dd, tree[i], ofuncs, combOutNames[i], 1); |
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| 243 | } |
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| 244 | fclose(feqn); |
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| 245 | } else { |
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| 246 | (void)fprintf(vis_stdout, |
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| 247 | "** synth error: Error in opening file [%s]\n", filename); |
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| 248 | } |
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| 249 | } |
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| 250 | sprintf(filename, "%s.ml.blif", filehead); |
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| 251 | SynthWriteBlifFile(network, dd, tree, filename, no, ofuncs, initStates, |
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| 252 | 0, verbosity); |
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| 253 | FREE(filename); |
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| 254 | SynthFreeNodeNameTable(); |
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| 255 | |
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| 256 | cleanup: |
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| 257 | /* Clean up. */ |
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| 258 | for (i = 0; i < no; i++) { |
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| 259 | if (!tree[i]) |
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| 260 | continue; |
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| 261 | bdd_recursive_deref_zdd(dd, tree[i]->node); |
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| 262 | /* frees some trees not in node-tree table */ |
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| 263 | if (tree[i]->ref) |
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| 264 | SynthFreeMlTree(tree[i], 0); |
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| 265 | } |
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| 266 | |
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| 267 | SynthClearMlTable(dd, table); |
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| 268 | st_free_table(table); |
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| 269 | FREE(tree); |
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| 270 | |
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| 271 | for (i = 0; i < no; i++) { |
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| 272 | if (!ofuncs[i]) |
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| 273 | continue; |
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| 274 | bdd_recursive_deref_zdd(dd, ofuncs[i]); |
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| 275 | } |
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| 276 | |
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| 277 | FREE(ofuncs); |
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| 278 | |
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| 279 | /* Restore reordering status. */ |
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| 280 | if (autoDyn) |
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| 281 | bdd_dynamic_reordering(dd, method, BDD_REORDER_VERBOSITY_DEFAULT); |
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| 282 | else |
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| 283 | bdd_dynamic_reordering_disable(dd); |
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| 284 | if (autoDynZ) |
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| 285 | bdd_dynamic_reordering_zdd(dd, methodZ, BDD_REORDER_VERBOSITY_DEFAULT); |
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| 286 | else |
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| 287 | bdd_dynamic_reordering_zdd_disable(dd); |
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| 288 | } |
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| 289 | |
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| 290 | |
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| 291 | /**Function******************************************************************** |
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| 292 | |
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| 293 | Synopsis [Sets the optional variable UseFuncDivisor.] |
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| 294 | |
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| 295 | Description [Sets the optional variable UseFuncDivisor. Currently |
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| 296 | UseFuncDivisor has always the initial value of 1, this is because it |
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| 297 | seems does better almost always than 0.] |
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| 298 | |
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| 299 | SideEffects [] |
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| 300 | |
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| 301 | SeeAlso [] |
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| 302 | |
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| 303 | ******************************************************************************/ |
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| 304 | void |
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| 305 | SynthSetUseFuncDivisor(int mode) |
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| 306 | { |
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| 307 | UseFuncDivisor = mode; |
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| 308 | } |
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| 309 | |
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| 310 | |
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| 311 | /**Function******************************************************************** |
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| 312 | |
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| 313 | Synopsis [Sets the optional variable OutputOrdering.] |
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| 314 | |
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| 315 | Description [Sets the optional variable OutputOrdering.] |
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| 316 | |
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| 317 | SideEffects [] |
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| 318 | |
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| 319 | SeeAlso [] |
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| 320 | |
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| 321 | ******************************************************************************/ |
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| 322 | void |
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| 323 | SynthSetOutputOrdering(int mode) |
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| 324 | { |
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| 325 | OutputOrdering = mode; |
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| 326 | } |
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| 327 | |
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| 328 | |
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| 329 | /**Function******************************************************************** |
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| 330 | |
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| 331 | Synopsis [Sets the cost factors to get a divisor for low power.] |
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| 332 | |
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| 333 | Description [Sets the cost factors to get a divisor for low power.] |
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| 334 | |
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| 335 | SideEffects [] |
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| 336 | |
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| 337 | SeeAlso [] |
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| 338 | |
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| 339 | ******************************************************************************/ |
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| 340 | void |
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| 341 | SynthSetCostFactors(float supp, |
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| 342 | float prob) |
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| 343 | { |
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| 344 | SuppFactor = supp; |
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| 345 | ProbFactor = prob; |
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| 346 | } |
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| 347 | |
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| 348 | |
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| 349 | /**Function******************************************************************** |
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| 350 | |
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| 351 | Synopsis [Sets the variable SupportCount.] |
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| 352 | |
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| 353 | Description [Sets the variable SupportCount.] |
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| 354 | |
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| 355 | SideEffects [] |
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| 356 | |
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| 357 | SeeAlso [] |
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| 358 | |
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| 359 | ******************************************************************************/ |
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| 360 | void |
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| 361 | SynthSetSupportCount(int *count) |
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| 362 | { |
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| 363 | SupportCount = count; |
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| 364 | } |
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| 365 | |
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| 366 | |
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| 367 | /**Function******************************************************************** |
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| 368 | |
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| 369 | Synopsis [Sets the variable Probability.] |
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| 370 | |
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| 371 | Description [Sets the variable Probability.] |
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| 372 | |
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| 373 | SideEffects [] |
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| 374 | |
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| 375 | SeeAlso [] |
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| 376 | |
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| 377 | ******************************************************************************/ |
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| 378 | void |
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| 379 | SynthSetProbability(float *prob) |
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| 380 | { |
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| 381 | Probability = prob; |
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| 382 | } |
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| 383 | |
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| 384 | |
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| 385 | /**Function******************************************************************** |
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| 386 | |
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| 387 | Synopsis [Finds a good divisor for low power.] |
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| 388 | |
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| 389 | Description [Finds a good divisor for low power.] |
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| 390 | |
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| 391 | SideEffects [] |
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| 392 | |
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| 393 | SeeAlso [] |
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| 394 | |
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| 395 | ******************************************************************************/ |
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| 396 | int |
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| 397 | SynthFindDivisorForLowPower(int *count, |
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| 398 | int nvars, |
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| 399 | int min_count, |
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| 400 | int min_pos) |
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| 401 | { |
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| 402 | int i, v; |
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| 403 | float cost, best; |
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| 404 | |
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| 405 | if ((!SupportCount) || (!Probability)) |
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| 406 | return(-1); |
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| 407 | |
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| 408 | v = min_pos; |
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| 409 | if (SuppFactor == 0.0 && ProbFactor == 0.0) |
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| 410 | best = (float)SupportCount[min_pos] * Probability[min_pos]; |
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| 411 | else { |
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| 412 | best = (float)SupportCount[min_pos] * SuppFactor + |
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| 413 | Probability[min_pos] * ProbFactor; |
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| 414 | } |
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| 415 | |
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| 416 | for (i = min_pos + 1; i < nvars; i++) { |
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| 417 | if (count[i] == min_count) { |
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| 418 | if (SuppFactor == 0.0 && ProbFactor == 0.0) |
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| 419 | cost = (float)SupportCount[i] * Probability[i]; |
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| 420 | else { |
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| 421 | cost = (float)SupportCount[i] * SuppFactor + |
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| 422 | Probability[i] * ProbFactor; |
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| 423 | } |
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| 424 | if (cost > best) { |
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| 425 | best = cost; |
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| 426 | v = i; |
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| 427 | } |
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| 428 | } |
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| 429 | } |
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| 430 | |
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| 431 | return(v); |
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| 432 | } |
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| 433 | |
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| 434 | |
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| 435 | /**Function******************************************************************** |
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| 436 | |
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| 437 | Synopsis [Returns the i-th output name.] |
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| 438 | |
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| 439 | Description [Returns the i-th output name.] |
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| 440 | |
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| 441 | SideEffects [] |
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| 442 | |
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| 443 | SeeAlso [] |
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| 444 | |
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| 445 | ******************************************************************************/ |
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| 446 | char * |
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| 447 | SynthGetIthOutputName(int i) |
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| 448 | { |
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| 449 | return outputNames[i]; |
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| 450 | } |
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| 451 | |
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| 452 | |
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| 453 | /**Function******************************************************************** |
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| 454 | |
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| 455 | Synopsis [Checks whether one support set is a subset of the other |
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| 456 | support set.] |
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| 457 | |
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| 458 | Description [Checks whether one support set is a subset of the other |
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| 459 | support set. A support set is represented by a bit-vector. If the |
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| 460 | index 0 variable of a unique table is in the support of a function, |
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| 461 | then the MSB bit is set to 1. In general, for the variable of index |
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| 462 | i, the i-th bit from the MSB is set to 1. The argument size means |
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| 463 | the number of words (word = sizeof(int)). If the sets are the same, |
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| 464 | SynthIsSubsetOfSupport returns 2. If the first set is a subset of |
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| 465 | the second, it returns 1, otherwise it returns 0.] |
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| 466 | |
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| 467 | SideEffects [] |
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| 468 | |
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| 469 | SeeAlso [IsSubsetOfSupportForOneWord IsNullSupport] |
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| 470 | |
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| 471 | ******************************************************************************/ |
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| 472 | int |
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| 473 | SynthIsSubsetOfSupport(int size, |
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| 474 | unsigned int *mask1, |
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| 475 | unsigned int *mask2) |
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| 476 | { |
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| 477 | int i, tmp, flag = 0; |
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| 478 | |
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| 479 | if (!mask2) |
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| 480 | return(1); |
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| 481 | |
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| 482 | if (IsNullSupport(size, mask1) && IsNullSupport(size, mask2)) |
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| 483 | return(0); |
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| 484 | else if (IsNullSupport(size, mask1)) |
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| 485 | return(0); |
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| 486 | else if (IsNullSupport(size, mask2)) |
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| 487 | return(1); |
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| 488 | |
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| 489 | for (i = 0; i < size; i++) { |
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| 490 | tmp = IsSubsetOfSupportForOneWord(mask1[i], mask2[i]); |
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| 491 | if (tmp == 0) |
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| 492 | return(0); |
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| 493 | flag |= tmp; |
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| 494 | } |
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| 495 | |
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| 496 | return(flag); |
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| 497 | } |
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| 498 | |
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| 499 | |
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| 500 | /*---------------------------------------------------------------------------*/ |
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| 501 | /* Definition of static functions */ |
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| 502 | /*---------------------------------------------------------------------------*/ |
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| 503 | |
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| 504 | /**Function******************************************************************** |
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| 505 | |
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| 506 | Synopsis [This function orders the output functions. With this |
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| 507 | output ordering, the lowest indexed output function is factorized |
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| 508 | first.] |
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| 509 | |
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| 510 | Description [This function orders the output functions. With this |
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| 511 | output ordering, the lowest indexed output function is factorized |
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| 512 | first. If OutputOrder is 0, the output order is just the same as the |
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| 513 | order VIS has. If OutputOrder is 1, the smallest function (in terms |
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| 514 | of the number of support variables) will be placed first in the |
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| 515 | order. In case of tie, the function with the smaller BDD is placed |
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| 516 | before the other in the order. If OutputOrder is 2, the smallest |
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| 517 | function in terms of BDD size is first.] |
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| 518 | |
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| 519 | SideEffects [] |
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| 520 | |
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| 521 | SeeAlso [SynthMultiLevelOptimize] |
---|
| 522 | |
---|
| 523 | ******************************************************************************/ |
---|
| 524 | static void |
---|
| 525 | GetOutputOrder(bdd_manager *dd, |
---|
| 526 | bdd_node **ofuncs, |
---|
| 527 | int no, |
---|
| 528 | int *order, |
---|
| 529 | int verbosity) |
---|
| 530 | { |
---|
| 531 | int i, j, k, flag; |
---|
| 532 | int *support, *bddsize; |
---|
| 533 | int size; |
---|
| 534 | unsigned int **mask; |
---|
| 535 | int word, sizeZ; |
---|
| 536 | int pos, bit, bit_mask; |
---|
| 537 | int insert_flag, s1, s2; |
---|
| 538 | |
---|
| 539 | if (no == 1) { |
---|
| 540 | order[0] = 0; |
---|
| 541 | return; |
---|
| 542 | } |
---|
| 543 | |
---|
| 544 | if (OutputOrdering == 0) { |
---|
| 545 | for (i = 0; i < no; i++) |
---|
| 546 | order[i] = i; |
---|
| 547 | return; |
---|
| 548 | } |
---|
| 549 | |
---|
| 550 | bddsize = ALLOC(int, no); |
---|
| 551 | if (OutputOrdering == 2) { |
---|
| 552 | for (i = 0; i < no; i++) { |
---|
| 553 | if (!ofuncs[i]) { |
---|
| 554 | order[i] = i; |
---|
| 555 | bddsize[i] = 0; |
---|
| 556 | continue; |
---|
| 557 | } |
---|
| 558 | |
---|
| 559 | bddsize[i] = bdd_node_size(ofuncs[i]); |
---|
| 560 | |
---|
| 561 | /* Insert i-th output at the right place in the order. */ |
---|
| 562 | for (j = 0; j < i; j++) { |
---|
| 563 | if (bddsize[i] < bddsize[order[j]]) { |
---|
| 564 | for (k = i; k > j; k--) |
---|
| 565 | order[k] = order[k - 1]; |
---|
| 566 | order[j] = i; |
---|
| 567 | break; |
---|
| 568 | } |
---|
| 569 | } |
---|
| 570 | |
---|
| 571 | if (j == i) |
---|
| 572 | order[i] = i; |
---|
| 573 | } |
---|
| 574 | |
---|
| 575 | if (verbosity) { |
---|
| 576 | fprintf(vis_stdout, "output order :"); |
---|
| 577 | for (i = 0; i < no; i++) |
---|
| 578 | fprintf(vis_stdout, " %d", order[i]); |
---|
| 579 | fprintf(vis_stdout, "\n"); |
---|
| 580 | if (verbosity > 1) { |
---|
| 581 | for (i = 0; i < no; i++) |
---|
| 582 | fprintf(vis_stdout, "%d - %d", i, bddsize[i]); |
---|
| 583 | } |
---|
| 584 | } |
---|
| 585 | |
---|
| 586 | FREE(bddsize); |
---|
| 587 | return; |
---|
| 588 | } |
---|
| 589 | |
---|
| 590 | /* Here OutputOrdering should be 1. */ |
---|
| 591 | mask = ALLOC(unsigned int *, no); |
---|
| 592 | sizeZ = bdd_num_zdd_vars(dd); |
---|
| 593 | support = ALLOC(int, sizeZ); |
---|
| 594 | word = sizeof(int) * 8; |
---|
| 595 | size = sizeZ / word + 1; |
---|
| 596 | |
---|
| 597 | for (i = 0; i < no; i++) { |
---|
| 598 | if (!ofuncs[i]) { |
---|
| 599 | mask[i] = (unsigned int *)NULL; |
---|
| 600 | order[i] = i; |
---|
| 601 | bddsize[i] = 0; |
---|
| 602 | continue; |
---|
| 603 | } |
---|
| 604 | |
---|
| 605 | mask[i] = ALLOC(unsigned int, size); |
---|
| 606 | (void)memset((void *)mask[i], 0, size * sizeof(int)); |
---|
| 607 | (void)memset((void *)support, 0, sizeof(int) * sizeZ); |
---|
| 608 | SynthZddSupportStep(bdd_regular(ofuncs[i]), support); |
---|
| 609 | SynthZddClearFlag(bdd_regular(ofuncs[i])); |
---|
| 610 | /* Pack the support array into a bit vector. */ |
---|
| 611 | for (j = 0; j < sizeZ; j++) { |
---|
| 612 | if (support[j]) { |
---|
| 613 | pos = j / word; |
---|
| 614 | bit = j % word; |
---|
| 615 | bit_mask = 01 << bit; |
---|
| 616 | mask[i][pos] |= bit_mask; |
---|
| 617 | } |
---|
| 618 | } |
---|
| 619 | bddsize[i] = bdd_node_size(ofuncs[i]); |
---|
| 620 | |
---|
| 621 | for (j = 0; j < i; j++) { |
---|
| 622 | insert_flag = 0; |
---|
| 623 | flag = SynthIsSubsetOfSupport(size, mask[i], mask[order[j]]); |
---|
| 624 | if (flag == 1) |
---|
| 625 | insert_flag = 1; |
---|
| 626 | else if (flag == 2) { |
---|
| 627 | s1 = GetNumberOfSupport(sizeZ, size, mask[i]); |
---|
| 628 | s2 = GetNumberOfSupport(sizeZ, size, mask[order[j]]); |
---|
| 629 | if (s1 < s2 || (s1 == s2 && bddsize[i] < bddsize[order[j]])) |
---|
| 630 | insert_flag = 1; |
---|
| 631 | } |
---|
| 632 | if (insert_flag) { |
---|
| 633 | for (k = i; k > j; k--) |
---|
| 634 | order[k] = order[k - 1]; |
---|
| 635 | order[j] = i; |
---|
| 636 | break; |
---|
| 637 | } |
---|
| 638 | } |
---|
| 639 | |
---|
| 640 | if (j == i) |
---|
| 641 | order[i] = i; |
---|
| 642 | } |
---|
| 643 | FREE(support); |
---|
| 644 | FREE(bddsize); |
---|
| 645 | |
---|
| 646 | if (verbosity) { |
---|
| 647 | fprintf(vis_stdout, "output order :"); |
---|
| 648 | for (i = 0; i < no; i++) |
---|
| 649 | fprintf(vis_stdout, " %d", order[i]); |
---|
| 650 | fprintf(vis_stdout, "\n"); |
---|
| 651 | if (verbosity > 1) { |
---|
| 652 | for (i = 0; i < no; i++) { |
---|
| 653 | if (mask[i]) |
---|
| 654 | PrintSupportMask(sizeZ, size, mask[i]); |
---|
| 655 | } |
---|
| 656 | } |
---|
| 657 | } |
---|
| 658 | |
---|
| 659 | for (i = 0; i < no; i++) { |
---|
| 660 | if (mask[i]) |
---|
| 661 | FREE(mask[i]); |
---|
| 662 | } |
---|
| 663 | FREE(mask); |
---|
| 664 | } |
---|
| 665 | |
---|
| 666 | |
---|
| 667 | /**Function******************************************************************** |
---|
| 668 | |
---|
| 669 | Synopsis [Checks whether a set of support for one word is subset of the |
---|
| 670 | other set of support for one word.] |
---|
| 671 | |
---|
| 672 | Description [Checks whether a set of support for one word is subset of |
---|
| 673 | the other set of support for one word. SynthIsSubsetOfSupport() calls |
---|
| 674 | this function for each word.] |
---|
| 675 | |
---|
| 676 | SideEffects [] |
---|
| 677 | |
---|
| 678 | SeeAlso [SynthIsSubsetOfSupport] |
---|
| 679 | |
---|
| 680 | ******************************************************************************/ |
---|
| 681 | static int |
---|
| 682 | IsSubsetOfSupportForOneWord(unsigned int mask1, |
---|
| 683 | unsigned int mask2) |
---|
| 684 | { |
---|
| 685 | unsigned int tmp; |
---|
| 686 | |
---|
| 687 | if (mask1 == mask2) |
---|
| 688 | return(2); |
---|
| 689 | |
---|
| 690 | tmp = mask1 | mask2; |
---|
| 691 | if (tmp != mask2) |
---|
| 692 | return(0); |
---|
| 693 | return(1); |
---|
| 694 | } |
---|
| 695 | |
---|
| 696 | |
---|
| 697 | /**Function******************************************************************** |
---|
| 698 | |
---|
| 699 | Synopsis [Checks if a support set is empty.] |
---|
| 700 | |
---|
| 701 | Description [Checks if a support set is empty.] |
---|
| 702 | |
---|
| 703 | SideEffects [] |
---|
| 704 | |
---|
| 705 | SeeAlso [] |
---|
| 706 | |
---|
| 707 | ******************************************************************************/ |
---|
| 708 | static int |
---|
| 709 | IsNullSupport(int size, |
---|
| 710 | unsigned int *mask) |
---|
| 711 | { |
---|
| 712 | int i; |
---|
| 713 | |
---|
| 714 | for (i = 0; i < size; i++) { |
---|
| 715 | if (mask[i] != 0) |
---|
| 716 | return(0); |
---|
| 717 | } |
---|
| 718 | return(1); |
---|
| 719 | } |
---|
| 720 | |
---|
| 721 | |
---|
| 722 | /**Function******************************************************************** |
---|
| 723 | |
---|
| 724 | Synopsis [Prints the support of a function.] |
---|
| 725 | |
---|
| 726 | Description [Prints the support of a function. The argument n is the |
---|
| 727 | number of variables and size is the number of word and mask is the |
---|
| 728 | array of support mask. The first line shows column index by modulo 10 |
---|
| 729 | and the next line shows which variables are support by printing 1.] |
---|
| 730 | |
---|
| 731 | SideEffects [] |
---|
| 732 | |
---|
| 733 | SeeAlso [] |
---|
| 734 | |
---|
| 735 | ******************************************************************************/ |
---|
| 736 | static void |
---|
| 737 | PrintSupportMask(int n, |
---|
| 738 | int size, |
---|
| 739 | unsigned int *mask) |
---|
| 740 | { |
---|
| 741 | int i, j, pos, last; |
---|
| 742 | char *support; |
---|
| 743 | char *mark; |
---|
| 744 | int bit; |
---|
| 745 | |
---|
| 746 | support = ALLOC(char,n); |
---|
| 747 | mark = ALLOC(char,n); |
---|
| 748 | |
---|
| 749 | pos = 0; |
---|
| 750 | for (i = 0; i < size; i++) { |
---|
| 751 | if (i == (size - 1)) |
---|
| 752 | last = n % 32; |
---|
| 753 | else |
---|
| 754 | last = 32; |
---|
| 755 | bit = 01; |
---|
| 756 | for (j = 0; j < last; j++) { |
---|
| 757 | sprintf(&mark[pos], "%d", pos % 10); |
---|
| 758 | if (mask[i] & bit) |
---|
| 759 | support[pos] = '1'; |
---|
| 760 | else |
---|
| 761 | support[pos] = '0'; |
---|
| 762 | pos++; |
---|
| 763 | bit = bit << 1; |
---|
| 764 | } |
---|
| 765 | } |
---|
| 766 | mark[pos] = support[pos] = '\0'; |
---|
| 767 | |
---|
| 768 | fprintf(vis_stdout, "%s\n", mark); |
---|
| 769 | fprintf(vis_stdout, "%s\n", support); |
---|
| 770 | |
---|
| 771 | FREE(support); |
---|
| 772 | FREE(mark); |
---|
| 773 | } |
---|
| 774 | |
---|
| 775 | |
---|
| 776 | /**Function******************************************************************** |
---|
| 777 | |
---|
| 778 | Synopsis [Returns the number of support variables of a function.] |
---|
| 779 | |
---|
| 780 | Description [Returns the number of support variables of a function.] |
---|
| 781 | |
---|
| 782 | SideEffects [none] |
---|
| 783 | |
---|
| 784 | SeeAlso [] |
---|
| 785 | |
---|
| 786 | ******************************************************************************/ |
---|
| 787 | static int |
---|
| 788 | GetNumberOfSupport(int n, |
---|
| 789 | int size, |
---|
| 790 | unsigned int *mask) |
---|
| 791 | { |
---|
| 792 | int i, j, last; |
---|
| 793 | int bit; |
---|
| 794 | int count; |
---|
| 795 | |
---|
| 796 | count = 0; |
---|
| 797 | for (i = 0; i < size; i++) { |
---|
| 798 | if (i == (size - 1)) |
---|
| 799 | last = n % 32; |
---|
| 800 | else |
---|
| 801 | last = 32; |
---|
| 802 | bit = 01; |
---|
| 803 | for (j = 0; j < last; j++) { |
---|
| 804 | if (mask[i] & bit) |
---|
| 805 | count++; |
---|
| 806 | bit = bit << 1; |
---|
| 807 | } |
---|
| 808 | } |
---|
| 809 | return(count); |
---|
| 810 | } |
---|
| 811 | |
---|
| 812 | |
---|
| 813 | /**Function******************************************************************** |
---|
| 814 | |
---|
| 815 | Synopsis [Factorizes a network.] |
---|
| 816 | |
---|
| 817 | Description [Factorizes a network. If successful, it returns 0, |
---|
| 818 | otherwise it returns 1 due to lack of memory.] |
---|
| 819 | |
---|
| 820 | SideEffects [] |
---|
| 821 | |
---|
| 822 | SeeAlso [SynthMultiLevelOptimize] |
---|
| 823 | |
---|
| 824 | ******************************************************************************/ |
---|
| 825 | static int |
---|
| 826 | factorizeNetwork(Ntk_Network_t *net, |
---|
| 827 | bdd_manager *dd, |
---|
| 828 | bdd_node **ofuncs, |
---|
| 829 | MlTree **tree, |
---|
| 830 | int no, |
---|
| 831 | int *out_order, |
---|
| 832 | st_table *table, |
---|
| 833 | char **combOutNames, |
---|
| 834 | int divisor, |
---|
| 835 | MlTree *(* factoring_func)(bdd_manager *, st_table *, |
---|
| 836 | bdd_node *, int, int *, MlTree *, |
---|
| 837 | int, MlTree *, int), |
---|
| 838 | int verbosity) |
---|
| 839 | { |
---|
| 840 | int i, j, k; |
---|
| 841 | int ref; |
---|
| 842 | int nml; |
---|
| 843 | MlTree *tmp_tree; |
---|
| 844 | int flag; |
---|
| 845 | int comp_flag; |
---|
| 846 | |
---|
| 847 | SynthSetZddDivisorFunc(divisor); /* set static variable in synthFactor.c */ |
---|
| 848 | |
---|
| 849 | for (k = 0; k < no; k++) { |
---|
| 850 | i = out_order[k]; |
---|
| 851 | if (!ofuncs[i]) { |
---|
| 852 | tree[i] = NULL; |
---|
| 853 | continue; |
---|
| 854 | } |
---|
| 855 | if (verbosity) |
---|
| 856 | SynthPrintZddCoverWithName(net, dd, ofuncs[i]); |
---|
| 857 | |
---|
| 858 | tree[i] = (MlTree *)NULL; |
---|
| 859 | ref = 0; |
---|
| 860 | if (ofuncs[i] == bdd_read_one(dd) || ofuncs[i] == bdd_read_zero(dd)) { |
---|
| 861 | tree[i] = SynthFindOrCreateMlTree(table, dd, ofuncs[i], 1, 0, |
---|
| 862 | &ref, verbosity); |
---|
| 863 | if (!tree[i]) |
---|
| 864 | return(1); |
---|
| 865 | } else { |
---|
| 866 | tree[i] = SynthLookupMlTable(table, dd, ofuncs[i], 1, verbosity); |
---|
| 867 | if (tree[i]) { |
---|
| 868 | if (MlTree_IsComplement(tree[i]) || tree[i]->top) |
---|
| 869 | ref = 1; |
---|
| 870 | else |
---|
| 871 | SynthUpdateRefOfParent(tree[i]); |
---|
| 872 | } |
---|
| 873 | else if (UseFuncDivisor) { |
---|
| 874 | /* Try to divide by existing functions. The smaller |
---|
| 875 | * functions are factored first to increase the probability |
---|
| 876 | * of success of this step. Both phases of the divisor are |
---|
| 877 | * tried. |
---|
| 878 | */ |
---|
| 879 | for (j = k - 1; j >= 0; j--) { |
---|
| 880 | tree[i] = (* factoring_func)(dd, table, ofuncs[i], 0, &ref, |
---|
| 881 | tree[out_order[j]], 0, NULL, verbosity); |
---|
| 882 | if (tree[i]) { |
---|
| 883 | SynthSetSharedFlag(dd, tree[out_order[j]]); |
---|
| 884 | break; |
---|
| 885 | } else if (noMemoryFlag == 1) |
---|
| 886 | return(1); |
---|
| 887 | else { |
---|
| 888 | tree[i] = (* factoring_func)(dd, table, ofuncs[i], 0, |
---|
| 889 | &ref, tree[out_order[j]], 1, NULL, verbosity); |
---|
| 890 | if (tree[i]) { |
---|
| 891 | SynthSetSharedFlag(dd, tree[out_order[j]]); |
---|
| 892 | break; |
---|
| 893 | } else if (noMemoryFlag == 1) |
---|
| 894 | return(1); |
---|
| 895 | } |
---|
| 896 | } |
---|
| 897 | } |
---|
| 898 | } |
---|
| 899 | /* Division by other functions did not work. Find a brand-new |
---|
| 900 | * factorization. |
---|
| 901 | */ |
---|
| 902 | if (!tree[i]) { |
---|
| 903 | tree[i] = (* factoring_func)(dd, table, ofuncs[i], 0, |
---|
| 904 | &ref, NULL, 0, NULL, verbosity); |
---|
| 905 | if (!tree[i]) |
---|
| 906 | return(1); |
---|
| 907 | } |
---|
| 908 | /* Compute the complement ZDD node of ofuncs[i], if not exist. |
---|
| 909 | * This is to increase sharing. |
---|
| 910 | */ |
---|
| 911 | tmp_tree = tree[i]; |
---|
| 912 | tree[i] = SynthCheckAndMakeComplement(dd, table, tree[i], &comp_flag, |
---|
| 913 | verbosity); |
---|
| 914 | if (!tree[i]) |
---|
| 915 | return(1); |
---|
| 916 | else if (tree[i] != tmp_tree) { |
---|
| 917 | ref = 1; |
---|
| 918 | if (comp_flag) |
---|
| 919 | tree[i] = MlTree_Not(tree[i]); |
---|
| 920 | } |
---|
| 921 | |
---|
| 922 | /* When the tree already exists, create a new tree and copy all |
---|
| 923 | * contents, and set the field 'ref' to 1. This is for the |
---|
| 924 | * purpose of avoiding duplicate literal counting. |
---|
| 925 | */ |
---|
| 926 | if (ref) { |
---|
| 927 | int comp_flag; |
---|
| 928 | |
---|
| 929 | comp_flag = 0; |
---|
| 930 | if (MlTree_IsComplement(tree[i])) { |
---|
| 931 | tree[i] = MlTree_Not(tree[i]); |
---|
| 932 | comp_flag = 1; |
---|
| 933 | } |
---|
| 934 | tmp_tree = ALLOC(MlTree, sizeof(MlTree)); |
---|
| 935 | memcpy((void *)tmp_tree, (void *)tree[i], sizeof(MlTree)); |
---|
| 936 | tree[i] = tmp_tree; |
---|
| 937 | tree[i]->ref = 1; |
---|
| 938 | tree[i]->comp = comp_flag; |
---|
| 939 | } |
---|
| 940 | tree[i]->top = 1; |
---|
| 941 | bdd_ref(tree[i]->node); |
---|
| 942 | |
---|
| 943 | nml = SynthCountMlLiteral(dd, tree[i], 1); |
---|
| 944 | |
---|
| 945 | if (verbosity) { |
---|
| 946 | SynthPrintMlTreeWithName(net, dd, tree[i], "result : "); |
---|
| 947 | fprintf(vis_stdout, "**** %d (#literal = %d) ****\n", i, nml); |
---|
| 948 | if (verbosity > 1) |
---|
| 949 | SynthWriteEqn(stdout, net, dd, tree[i], ofuncs, combOutNames[i], 1); |
---|
| 950 | } |
---|
| 951 | |
---|
| 952 | if (VerifyTreeMode) { |
---|
| 953 | SynthVerifyTree(dd, tree[i], 1); |
---|
| 954 | SynthVerifyMlTable(dd, table); |
---|
| 955 | } |
---|
| 956 | } |
---|
| 957 | |
---|
| 958 | flag = SynthPostFactoring(dd, table, factoring_func, verbosity); |
---|
| 959 | |
---|
| 960 | if (VerifyTreeMode) { |
---|
| 961 | bdd_node *tmp; |
---|
| 962 | |
---|
| 963 | for (i = 0; i < no; i++) { |
---|
| 964 | if (tree[i]->comp) |
---|
| 965 | tmp = tree[i]->complement; |
---|
| 966 | else |
---|
| 967 | tmp = tree[i]->node; |
---|
| 968 | if (tmp != ofuncs[i]) { |
---|
| 969 | (void) fprintf(vis_stdout, |
---|
| 970 | "** synth error: Different zdds in [%s].\n", |
---|
| 971 | combOutNames[i]); |
---|
| 972 | } |
---|
| 973 | SynthVerifyTree(dd, tree[i], 1); |
---|
| 974 | } |
---|
| 975 | } |
---|
| 976 | |
---|
| 977 | return(flag); |
---|
| 978 | } |
---|