1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
|
/**CFile****************************************************************
FileName [ivyTable.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [And-Inverter Graph package.]
Synopsis [Structural hashing table.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - May 11, 2006. ]
Revision [$Id: ivyTable.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
***********************************************************************/
#include "ivy.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
// hashing the node
static unsigned Ivy_Hash( Ivy_Obj_t * pObj, int TableSize )
{
unsigned Key = Ivy_ObjIsExor(pObj) * 1699;
Key ^= Ivy_ObjFaninId0(pObj) * 7937;
Key ^= Ivy_ObjFaninId1(pObj) * 2971;
Key ^= Ivy_ObjFaninC0(pObj) * 911;
Key ^= Ivy_ObjFaninC1(pObj) * 353;
Key ^= Ivy_ObjInit(pObj) * 911;
return Key % TableSize;
}
// returns the place where this node is stored (or should be stored)
static int * Ivy_TableFind( Ivy_Man_t * p, Ivy_Obj_t * pObj )
{
int i;
assert( Ivy_ObjIsHash(pObj) );
for ( i = Ivy_Hash(pObj, p->nTableSize); p->pTable[i]; i = (i+1) % p->nTableSize )
if ( p->pTable[i] == pObj->Id )
break;
return p->pTable + i;
}
static void Ivy_TableResize( Ivy_Man_t * p );
static unsigned int Cudd_PrimeAig( unsigned int p );
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Checks if node with the given attributes is in the hash table.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Ivy_Obj_t * Ivy_TableLookup( Ivy_Man_t * p, Ivy_Obj_t * pObj )
{
Ivy_Obj_t * pEntry;
int i;
assert( !Ivy_IsComplement(pObj) );
if ( !Ivy_ObjIsHash(pObj) )
return NULL;
assert( Ivy_ObjIsLatch(pObj) || Ivy_ObjFaninId0(pObj) > 0 );
assert( Ivy_ObjFaninId1(pObj) == 0 || Ivy_ObjFaninId0(pObj) < Ivy_ObjFaninId1(pObj) );
if ( Ivy_ObjFanin0(pObj)->nRefs == 0 || (Ivy_ObjChild1(pObj) && Ivy_ObjFanin1(pObj)->nRefs == 0) )
return NULL;
for ( i = Ivy_Hash(pObj, p->nTableSize); p->pTable[i]; i = (i+1) % p->nTableSize )
{
pEntry = Ivy_ManObj( p, p->pTable[i] );
if ( Ivy_ObjChild0(pEntry) == Ivy_ObjChild0(pObj) &&
Ivy_ObjChild1(pEntry) == Ivy_ObjChild1(pObj) &&
Ivy_ObjInit(pEntry) == Ivy_ObjInit(pObj) &&
Ivy_ObjType(pEntry) == Ivy_ObjType(pObj) )
return pEntry;
}
return NULL;
}
/**Function*************************************************************
Synopsis [Adds the node to the hash table.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Ivy_TableInsert( Ivy_Man_t * p, Ivy_Obj_t * pObj )
{
int * pPlace;
assert( !Ivy_IsComplement(pObj) );
if ( !Ivy_ObjIsHash(pObj) )
return;
if ( (pObj->Id & 63) == 0 )
{
if ( p->nTableSize < 2 * Ivy_ManHashObjNum(p) )
Ivy_TableResize( p );
}
pPlace = Ivy_TableFind( p, pObj );
assert( *pPlace == 0 );
*pPlace = pObj->Id;
}
/**Function*************************************************************
Synopsis [Deletes the node from the hash table.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Ivy_TableDelete( Ivy_Man_t * p, Ivy_Obj_t * pObj )
{
Ivy_Obj_t * pEntry;
int i, * pPlace;
assert( !Ivy_IsComplement(pObj) );
if ( !Ivy_ObjIsHash(pObj) )
return;
pPlace = Ivy_TableFind( p, pObj );
assert( *pPlace == pObj->Id ); // node should be in the table
*pPlace = 0;
// rehash the adjacent entries
i = pPlace - p->pTable;
for ( i = (i+1) % p->nTableSize; p->pTable[i]; i = (i+1) % p->nTableSize )
{
pEntry = Ivy_ManObj( p, p->pTable[i] );
p->pTable[i] = 0;
Ivy_TableInsert( p, pEntry );
}
}
/**Function*************************************************************
Synopsis [Updates the table to point to the new node.]
Description [If the old node (pObj) is in the table, updates the table
to point to an object with different ID (ObjIdNew). The table should
not contain an object with ObjIdNew (this is currently not checked).]
SideEffects []
SeeAlso []
***********************************************************************/
void Ivy_TableUpdate( Ivy_Man_t * p, Ivy_Obj_t * pObj, int ObjIdNew )
{
int * pPlace;
assert( !Ivy_IsComplement(pObj) );
if ( !Ivy_ObjIsHash(pObj) )
return;
pPlace = Ivy_TableFind( p, pObj );
assert( *pPlace == pObj->Id ); // node should be in the table
*pPlace = ObjIdNew;
}
/**Function*************************************************************
Synopsis [Count the number of nodes in the table.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Ivy_TableCountEntries( Ivy_Man_t * p )
{
int i, Counter = 0;
for ( i = 0; i < p->nTableSize; i++ )
Counter += (p->pTable[i] != 0);
return Counter;
}
/**Function*************************************************************
Synopsis [Resizes the table.]
Description [Typically this procedure should not be called.]
SideEffects []
SeeAlso []
***********************************************************************/
void Ivy_TableResize( Ivy_Man_t * p )
{
int * pTableOld, * pPlace;
int nTableSizeOld, Counter, nEntries, e;
clock_t clk;
clk = clock();
// save the old table
pTableOld = p->pTable;
nTableSizeOld = p->nTableSize;
// get the new table
p->nTableSize = Abc_PrimeCudd( 5 * Ivy_ManHashObjNum(p) );
p->pTable = ABC_ALLOC( int, p->nTableSize );
memset( p->pTable, 0, sizeof(int) * p->nTableSize );
// rehash the entries from the old table
Counter = 0;
for ( e = 0; e < nTableSizeOld; e++ )
{
if ( pTableOld[e] == 0 )
continue;
Counter++;
// get the place where this entry goes in the table table
pPlace = Ivy_TableFind( p, Ivy_ManObj(p, pTableOld[e]) );
assert( *pPlace == 0 ); // should not be in the table
*pPlace = pTableOld[e];
}
nEntries = Ivy_ManHashObjNum(p);
// assert( Counter == nEntries );
// printf( "Increasing the structural table size from %6d to %6d. ", nTableSizeOld, p->nTableSize );
// ABC_PRT( "Time", clock() - clk );
// replace the table and the parameters
ABC_FREE( pTableOld );
}
/**Function********************************************************************
Synopsis [Profiles the hash table.]
Description []
SideEffects []
SeeAlso []
******************************************************************************/
void Ivy_TableProfile( Ivy_Man_t * p )
{
int i, Counter = 0;
for ( i = 0; i < p->nTableSize; i++ )
{
if ( p->pTable[i] )
Counter++;
else if ( Counter )
{
printf( "%d ", Counter );
Counter = 0;
}
}
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
|
