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
273
274
275
276
277
278
279
280
281
282
283
284
285
286
|
/**CFile****************************************************************
FileName [lpkMux.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [Fast Boolean matching for LUT structures.]
Synopsis []
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - April 28, 2007.]
Revision [$Id: lpkMux.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
***********************************************************************/
#include "lpkInt.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Find the best cofactoring variable.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Lpk_MapTreeBestCofVar( Lpk_Man_t * p, unsigned * pTruth, int nVars, unsigned * pCof0, unsigned * pCof1 )
{
int i, iBestVar, nSuppSizeCur0, nSuppSizeCur1, nSuppSizeCur, nSuppSizeMin;
// iterate through variables
iBestVar = -1;
nSuppSizeMin = KIT_INFINITY;
for ( i = 0; i < nVars; i++ )
{
// cofactor the functiona and get support sizes
Kit_TruthCofactor0New( pCof0, pTruth, nVars, i );
Kit_TruthCofactor1New( pCof1, pTruth, nVars, i );
nSuppSizeCur0 = Kit_TruthSupportSize( pCof0, nVars );
nSuppSizeCur1 = Kit_TruthSupportSize( pCof1, nVars );
nSuppSizeCur = nSuppSizeCur0 + nSuppSizeCur1;
// skip cofactoring that goes above the limit
if ( nSuppSizeCur0 > p->pPars->nLutSize || nSuppSizeCur1 > p->pPars->nLutSize )
continue;
// compare this variable with other variables
if ( nSuppSizeMin > nSuppSizeCur )
{
nSuppSizeMin = nSuppSizeCur;
iBestVar = i;
}
}
// cofactor w.r.t. this variable
if ( iBestVar != -1 )
{
Kit_TruthCofactor0New( pCof0, pTruth, nVars, iBestVar );
Kit_TruthCofactor1New( pCof1, pTruth, nVars, iBestVar );
}
return iBestVar;
}
/**Function*************************************************************
Synopsis [Maps the function by the best cofactoring.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
If_Obj_t * Lpk_MapTreeMux_rec( Lpk_Man_t * p, unsigned * pTruth, int nVars, If_Obj_t ** ppLeaves )
{
unsigned * pCof0 = (unsigned *)Vec_PtrEntry( p->vTtNodes, 0 );
unsigned * pCof1 = (unsigned *)Vec_PtrEntry( p->vTtNodes, 1 );
If_Obj_t * pObj0, * pObj1;
Kit_DsdNtk_t * ppNtks[2];
int iBestVar;
assert( nVars > 3 );
p->fCalledOnce = 1;
// cofactor w.r.t. the best variable
iBestVar = Lpk_MapTreeBestCofVar( p, pTruth, nVars, pCof0, pCof1 );
if ( iBestVar == -1 )
return NULL;
// decompose the functions
ppNtks[0] = Kit_DsdDecompose( pCof0, nVars );
ppNtks[1] = Kit_DsdDecompose( pCof1, nVars );
if ( p->pPars->fVeryVerbose )
{
printf( "Cofactoring w.r.t. var %c (%d -> %d+%d supp vars):\n",
'a'+iBestVar, nVars, Kit_TruthSupportSize(pCof0, nVars), Kit_TruthSupportSize(pCof1, nVars) );
Kit_DsdPrintExpanded( ppNtks[0] );
Kit_DsdPrintExpanded( ppNtks[1] );
}
// map the DSD structures
pObj0 = Lpk_MapTree_rec( p, ppNtks[0], ppLeaves, ppNtks[0]->Root, NULL );
pObj1 = Lpk_MapTree_rec( p, ppNtks[1], ppLeaves, ppNtks[1]->Root, NULL );
Kit_DsdNtkFree( ppNtks[0] );
Kit_DsdNtkFree( ppNtks[1] );
return If_ManCreateMux( p->pIfMan, pObj0, pObj1, ppLeaves[iBestVar] );
}
/**Function*************************************************************
Synopsis [Implements support-reducing decomposition.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
If_Obj_t * Lpk_MapSuppRedDec_rec( Lpk_Man_t * p, unsigned * pTruth, int nVars, If_Obj_t ** ppLeaves )
{
Kit_DsdNtk_t * pNtkDec, * pNtkComp, * ppNtks[2], * pTemp;
If_Obj_t * pObjNew;
unsigned * pCof0 = (unsigned *)Vec_PtrEntry( p->vTtNodes, 0 );
unsigned * pCof1 = (unsigned *)Vec_PtrEntry( p->vTtNodes, 1 );
unsigned * pDec0 = (unsigned *)Vec_PtrEntry( p->vTtNodes, 2 );
unsigned * pDec1 = (unsigned *)Vec_PtrEntry( p->vTtNodes, 3 );
unsigned * pDec = (unsigned *)Vec_PtrEntry( p->vTtNodes, 4 );
unsigned * pCo00 = (unsigned *)Vec_PtrEntry( p->vTtNodes, 5 );
unsigned * pCo01 = (unsigned *)Vec_PtrEntry( p->vTtNodes, 6 );
unsigned * pCo10 = (unsigned *)Vec_PtrEntry( p->vTtNodes, 7 );
unsigned * pCo11 = (unsigned *)Vec_PtrEntry( p->vTtNodes, 8 );
unsigned * pCo0 = (unsigned *)Vec_PtrEntry( p->vTtNodes, 9 );
unsigned * pCo1 = (unsigned *)Vec_PtrEntry( p->vTtNodes, 10 );
unsigned * pCo = (unsigned *)Vec_PtrEntry( p->vTtNodes, 11 );
int TrueMint0, TrueMint1, FalseMint0, FalseMint1;
int uSubsets, uSubset0, uSubset1, iVar, iVarReused, i;
// determine if supp-red decomposition exists
uSubsets = Lpk_MapSuppRedDecSelect( p, pTruth, nVars, &iVar, &iVarReused );
if ( uSubsets == 0 )
return NULL;
p->nCalledSRed++;
// get the cofactors
Kit_TruthCofactor0New( pCof0, pTruth, nVars, iVar );
Kit_TruthCofactor1New( pCof1, pTruth, nVars, iVar );
// get the bound sets
uSubset0 = uSubsets & 0xFFFF;
uSubset1 = uSubsets >> 16;
// compute the decomposed functions
ppNtks[0] = Kit_DsdDecompose( pCof0, nVars );
ppNtks[1] = Kit_DsdDecompose( pCof1, nVars );
ppNtks[0] = Kit_DsdExpand( pTemp = ppNtks[0] ); Kit_DsdNtkFree( pTemp );
ppNtks[1] = Kit_DsdExpand( pTemp = ppNtks[1] ); Kit_DsdNtkFree( pTemp );
Kit_DsdTruthPartial( p->pDsdMan, ppNtks[0], pDec0, uSubset0 );
Kit_DsdTruthPartial( p->pDsdMan, ppNtks[1], pDec1, uSubset1 );
// Kit_DsdTruthPartialTwo( p->pDsdMan, ppNtks[0], uSubset0, iVarReused, pCo0, pDec0 );
// Kit_DsdTruthPartialTwo( p->pDsdMan, ppNtks[1], uSubset1, iVarReused, pCo1, pDec1 );
Kit_DsdNtkFree( ppNtks[0] );
Kit_DsdNtkFree( ppNtks[1] );
//Kit_DsdPrintFromTruth( pDec0, nVars );
//Kit_DsdPrintFromTruth( pDec1, nVars );
// get the decomposed function
Kit_TruthMuxVar( pDec, pDec0, pDec1, nVars, iVar );
// find any true assignments of the decomposed functions
TrueMint0 = Kit_TruthFindFirstBit( pDec0, nVars );
TrueMint1 = Kit_TruthFindFirstBit( pDec1, nVars );
assert( TrueMint0 >= 0 && TrueMint1 >= 0 );
// find any false assignments of the decomposed functions
FalseMint0 = Kit_TruthFindFirstZero( pDec0, nVars );
FalseMint1 = Kit_TruthFindFirstZero( pDec1, nVars );
assert( FalseMint0 >= 0 && FalseMint1 >= 0 );
// cofactor the cofactors according to these minterms
Kit_TruthCopy( pCo00, pCof0, nVars );
Kit_TruthCopy( pCo01, pCof0, nVars );
for ( i = 0; i < nVars; i++ )
if ( uSubset0 & (1 << i) )
{
if ( FalseMint0 & (1 << i) )
Kit_TruthCofactor1( pCo00, nVars, i );
else
Kit_TruthCofactor0( pCo00, nVars, i );
if ( TrueMint0 & (1 << i) )
Kit_TruthCofactor1( pCo01, nVars, i );
else
Kit_TruthCofactor0( pCo01, nVars, i );
}
Kit_TruthCopy( pCo10, pCof1, nVars );
Kit_TruthCopy( pCo11, pCof1, nVars );
for ( i = 0; i < nVars; i++ )
if ( uSubset1 & (1 << i) )
{
if ( FalseMint1 & (1 << i) )
Kit_TruthCofactor1( pCo10, nVars, i );
else
Kit_TruthCofactor0( pCo10, nVars, i );
if ( TrueMint1 & (1 << i) )
Kit_TruthCofactor1( pCo11, nVars, i );
else
Kit_TruthCofactor0( pCo11, nVars, i );
}
// derive the functions by composing them with the new variable (iVarReused)
Kit_TruthMuxVar( pCo0, pCo00, pCo01, nVars, iVarReused );
Kit_TruthMuxVar( pCo1, pCo10, pCo11, nVars, iVarReused );
//Kit_DsdPrintFromTruth( pCo0, nVars );
//Kit_DsdPrintFromTruth( pCo1, nVars );
// derive the composition function
Kit_TruthMuxVar( pCo , pCo0 , pCo1 , nVars, iVar );
// process the decomposed function
pNtkDec = Kit_DsdDecompose( pDec, nVars );
pNtkComp = Kit_DsdDecompose( pCo, nVars );
//Kit_DsdPrint( stdout, pNtkDec );
//Kit_DsdPrint( stdout, pNtkComp );
//printf( "cofactored variable %c\n", 'a' + iVar );
//printf( "reused variable %c\n", 'a' + iVarReused );
ppLeaves[iVarReused] = Lpk_MapTree_rec( p, pNtkDec, ppLeaves, pNtkDec->Root, NULL );
pObjNew = Lpk_MapTree_rec( p, pNtkComp, ppLeaves, pNtkComp->Root, NULL );
Kit_DsdNtkFree( pNtkDec );
Kit_DsdNtkFree( pNtkComp );
return pObjNew;
}
/**Function*************************************************************
Synopsis [Evaluates 4-LUT decompositions of larger functions.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Lpk_TryDec( word * pTruth, int nVars )
{
extern word If_Dec6Perform( word t, int fDerive );
extern void If_Dec6Verify( word t, word z );
//int nWords = Abc_Truth6WordNum( nVars );
assert( nVars == 8 );
printf( "%d", If_Dec6Perform(pTruth[0], 1) > 0 );
printf( "%d", If_Dec6Perform(pTruth[1], 1) > 0 );
printf( "%d", If_Dec6Perform(pTruth[2], 1) > 0 );
printf( "%d", If_Dec6Perform(pTruth[3], 1) > 0 );
printf( "\n" );
}
void Lpk_TryDecTest()
{
word t0 = ABC_CONST(0x4f1ead396f247a04);
word t1 = ABC_CONST(0x10bdb210c006eab5);
word t2 = ABC_CONST(0x68ab4bfa8acb7a13);
word t3 = ABC_CONST(0xb14ede67096c6eed);
word Truth[4] = {t0, t1, t2, t3};
Lpk_TryDec( Truth, 8 );
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
|
