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|
/**CFile****************************************************************
FileName [extraUtilEnum.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [extra]
Synopsis [Function enumeration.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: extraUtilEnum.c,v 1.0 2003/02/01 00:00:00 alanmi Exp $]
***********************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "misc/vec/vec.h"
#include "misc/vec/vecHsh.h"
#include "bool/kit/kit.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Abc_GetFirst( int * pnVars, int * pnMints, int * pnFuncs, unsigned * pVars, unsigned * pMints, unsigned * pFuncs )
{
int nVars = 8;
int nMints = 16;
int nFuncs = 8;
char * pMintStrs[16] = {
"1-1-1-1-",
"1-1--11-",
"1-1-1--1",
"1-1--1-1",
"-11-1-1-",
"-11--11-",
"-11-1--1",
"-11--1-1",
"1--11-1-",
"1--1-11-",
"1--11--1",
"1--1-1-1",
"-1-11-1-",
"-1-1-11-",
"-1-11--1",
"-1-1-1-1"
};
char * pFuncStrs[8] = {
"1111101011111010",
"0000010100000101",
"1111110010101001",
"0000001101010110",
"1111111111001101",
"0000000000110010",
"1111111111111110",
"0000000000000001",
};
int i, k;
*pnVars = nVars;
*pnMints = nMints;
*pnFuncs = nFuncs;
// extract mints
for ( i = 0; i < nMints; i++ )
for ( k = 0; k < nVars; k++ )
if ( pMintStrs[i][k] == '1' )
pMints[i] |= (1 << k), pVars[k] |= (1 << i);
// extract funcs
for ( i = 0; i < nFuncs; i++ )
for ( k = 0; k < nMints; k++ )
if ( pFuncStrs[i][k] == '1' )
pFuncs[i] |= (1 << k);
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Abc_GetSecond( int * pnVars, int * pnMints, int * pnFuncs, unsigned * pVars, unsigned * pMints, unsigned * pFuncs )
{
int nVars = 10;
int nMints = 32;
int nFuncs = 7;
char * pMintStrs[32] = {
"1-1---1---",
"1-1----1--",
"1-1-----1-",
"1-1------1",
"1--1--1---",
"1--1---1--",
"1--1----1-",
"1--1-----1",
"1---1-1---",
"1---1--1--",
"1---1---1-",
"1---1----1",
"1----11---",
"1----1-1--",
"1----1--1-",
"1----1---1",
"-11---1---",
"-11----1--",
"-11-----1-",
"-11------1",
"-1-1--1---",
"-1-1---1--",
"-1-1----1-",
"-1-1-----1",
"-1--1-1---",
"-1--1--1--",
"-1--1---1-",
"-1--1----1",
"-1---11---",
"-1---1-1--",
"-1---1--1-",
"-1---1---1"
};
char * pFuncStrs[7] = {
"11111110110010001110110010000000",
"00000001001101110001001101111111",
"10000001001001000001001001001000",
"01001000000100101000000100100100",
"00100100100000010100100000010010",
"00010010010010000010010010000001",
"11111111111111111111000000000000"
};
int i, k;
*pnVars = nVars;
*pnMints = nMints;
*pnFuncs = nFuncs;
// extract mints
for ( i = 0; i < nMints; i++ )
for ( k = 0; k < nVars; k++ )
if ( pMintStrs[i][k] == '1' )
pMints[i] |= (1 << k), pVars[k] |= (1 << i);
// extract funcs
for ( i = 0; i < nFuncs; i++ )
for ( k = 0; k < nMints; k++ )
if ( pFuncStrs[i][k] == '1' )
pFuncs[i] |= (1 << k);
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Abc_GetThird( int * pnVars, int * pnMints, int * pnFuncs, unsigned * pVars, unsigned * pMints, unsigned * pFuncs )
{
int nVars = 8;
int nMints = 16;
int nFuncs = 7;
char * pMintStrs[16] = {
"1---1---",
"1----1--",
"1-----1-",
"1------1",
"-1--1---",
"-1---1--",
"-1----1-",
"-1-----1",
"--1-1---",
"--1--1--",
"--1---1-",
"--1----1",
"---11---",
"---1-1--",
"---1--1-",
"---1---1"
};
char * pFuncStrs[7] = {
"1111111011001000",
"0000000100110111",
"1000000100100100",
"0100100000010010",
"0010010010000001",
"0001001001001000",
"1111111111111111"
};
int i, k;
*pnVars = nVars;
*pnMints = nMints;
*pnFuncs = nFuncs;
// extract mints
for ( i = 0; i < nMints; i++ )
for ( k = 0; k < nVars; k++ )
if ( pMintStrs[i][k] == '1' )
pMints[i] |= (1 << k), pVars[k] |= (1 << i);
// extract funcs
for ( i = 0; i < nFuncs; i++ )
for ( k = 0; k < nMints; k++ )
if ( pFuncStrs[i][k] == '1' )
pFuncs[i] |= (1 << k);
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Abc_EnumPrint_rec( Vec_Int_t * vGates, int i, int nVars )
{
int Fan0 = Vec_IntEntry(vGates, 2*i);
int Fan1 = Vec_IntEntry(vGates, 2*i+1);
char * pOper = (char*)(Fan0 < Fan1 ? "" : "+");
if ( Fan0 > Fan1 )
ABC_SWAP( int, Fan0, Fan1 );
if ( Fan0 < nVars )
printf( "%c", 'a'+Fan0 );
else
{
printf( "(" );
Abc_EnumPrint_rec( vGates, Fan0, nVars );
printf( ")" );
}
printf( "%s", pOper );
if ( Fan1 < nVars )
printf( "%c", 'a'+Fan1 );
else
{
printf( "(" );
Abc_EnumPrint_rec( vGates, Fan1, nVars );
printf( ")" );
}
}
void Abc_EnumPrint( Vec_Int_t * vGates, int i, int nVars )
{
assert( 2*i < Vec_IntSize(vGates) );
Abc_EnumPrint_rec( vGates, i, nVars );
printf( "\n" );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline int Abc_DataHasBit( word * p, word i ) { return (p[(i)>>6] & (((word)1)<<((i) & 63))) > 0; }
static inline void Abc_DataXorBit( word * p, word i ) { p[(i)>>6] ^= (((word)1)<<((i) & 63)); }
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Abc_EnumerateFunctions( int nDecMax )
{
int nVars;
int nMints;
int nFuncs;
unsigned pVars[100] = {0};
unsigned pMints[100] = {0};
unsigned pFuncs[100] = {0};
unsigned Truth;
int FuncDone[100] = {0}, nFuncDone = 0;
int GateCount[100] = {0};
int i, k, n, a, b, v;
abctime clk = Abc_Clock();
Vec_Int_t * vGates = Vec_IntAlloc( 100000 );
Vec_Int_t * vTruths = Vec_IntAlloc( 100000 );
// Vec_Int_t * vHash = Vec_IntStartFull( 1 << 16 );
word * pHash;
// extract data
// Abc_GetFirst( &nVars, &nMints, &nFuncs, pVars, pMints, pFuncs );
Abc_GetSecond( &nVars, &nMints, &nFuncs, pVars, pMints, pFuncs );
// Abc_GetThird( &nVars, &nMints, &nFuncs, pVars, pMints, pFuncs );
// create hash table
assert( nMints == 16 || nMints == 32 );
pHash = (word *)ABC_CALLOC( char, 1 << (nMints-3) );
// create elementary gates
for ( k = 0; k < nVars; k++ )
{
// Vec_IntWriteEntry( vHash, pVars[k], k );
Abc_DataXorBit( pHash, pVars[k] );
Vec_IntPush( vTruths, pVars[k] );
Vec_IntPush( vGates, -1 );
Vec_IntPush( vGates, -1 );
}
// go through different number of variables
GateCount[0] = 0;
GateCount[1] = nVars;
assert( Vec_IntSize(vTruths) == nVars );
for ( n = 0; n < nDecMax && nFuncDone < nFuncs; n++ )
{
for ( a = 0; a <= n; a++ )
for ( b = a; b <= n; b++ )
if ( a + b == n )
{
printf( "Trying %d + %d + 1 = %d\n", a, b, n+1 );
for ( i = GateCount[a]; i < GateCount[a+1]; i++ )
for ( k = GateCount[b]; k < GateCount[b+1]; k++ )
if ( i < k )
{
Truth = Vec_IntEntry(vTruths, i) & Vec_IntEntry(vTruths, k);
// if ( Vec_IntEntry(vHash, Truth) == -1 )
if ( !Abc_DataHasBit(pHash, Truth) )
{
// Vec_IntWriteEntry( vHash, Truth, Vec_IntSize(vTruths) );
Abc_DataXorBit( pHash, Truth );
Vec_IntPush( vTruths, Truth );
Vec_IntPush( vGates, i );
Vec_IntPush( vGates, k );
for ( v = 0; v < nFuncs; v++ )
if ( !FuncDone[v] && Truth == pFuncs[v] )
{
printf( "Found function %d with %d gates: ", v, n+1 );
Abc_EnumPrint( vGates, Vec_IntSize(vTruths)-1, nVars );
FuncDone[v] = 1;
nFuncDone++;
}
}
Truth = Vec_IntEntry(vTruths, i) | Vec_IntEntry(vTruths, k);
// if ( Vec_IntEntry(vHash, Truth) == -1 )
if ( !Abc_DataHasBit(pHash, Truth) )
{
// Vec_IntWriteEntry( vHash, Truth, Vec_IntSize(vTruths) );
Abc_DataXorBit( pHash, Truth );
Vec_IntPush( vTruths, Truth );
Vec_IntPush( vGates, k );
Vec_IntPush( vGates, i );
for ( v = 0; v < nFuncs; v++ )
if ( !FuncDone[v] && Truth == pFuncs[v] )
{
printf( "Found function %d with %d gates: ", v, n+1 );
Abc_EnumPrint( vGates, Vec_IntSize(vTruths)-1, nVars );
FuncDone[v] = 1;
nFuncDone++;
}
}
}
}
GateCount[n+2] = Vec_IntSize(vTruths);
printf( "Finished %d gates. Truths = %10d. ", n+1, Vec_IntSize(vTruths) );
Abc_PrintTime( 1, "Time", Abc_Clock() - clk );
}
ABC_FREE( pHash );
// Vec_IntFree( vHash );
Vec_IntFree( vGates );
Vec_IntFree( vTruths );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
#define ABC_ENUM_MAX 16
static word s_Truths6[6] = {
ABC_CONST(0xAAAAAAAAAAAAAAAA),
ABC_CONST(0xCCCCCCCCCCCCCCCC),
ABC_CONST(0xF0F0F0F0F0F0F0F0),
ABC_CONST(0xFF00FF00FF00FF00),
ABC_CONST(0xFFFF0000FFFF0000),
ABC_CONST(0xFFFFFFFF00000000)
};
typedef struct Abc_EnuMan_t_ Abc_EnuMan_t;
struct Abc_EnuMan_t_
{
int nVars; // support size
int nVarsFree; // number of PIs used
int fVerbose; // verbose flag
int fUseXor; // using XOR gate
int nNodeMax; // the max number of nodes
int nNodes; // current number of gates
int nTops; // the number of fanoutless gates
int pFans0[ABC_ENUM_MAX]; // fanins
int pFans1[ABC_ENUM_MAX]; // fanins
int fCompl0[ABC_ENUM_MAX]; // complements
int fCompl1[ABC_ENUM_MAX]; // complements
int Polar[ABC_ENUM_MAX]; // polarity
int pRefs[ABC_ENUM_MAX]; // references
int pLevel[ABC_ENUM_MAX]; // level
word pTruths[ABC_ENUM_MAX]; // truth tables
word nTries; // attempts to build a gate
word nBuilds; // actually built gates
word nFinished; // finished structures
};
static inline void Abc_EnumRef( Abc_EnuMan_t * p, int i )
{
assert( p->pRefs[i] >= 0 );
if ( p->pRefs[i]++ == 0 )
p->nTops--;
}
static inline void Abc_EnumDeref( Abc_EnuMan_t * p, int i )
{
if ( --p->pRefs[i] == 0 )
p->nTops++;
assert( p->pRefs[i] >= 0 );
}
static inline void Abc_EnumRefNode( Abc_EnuMan_t * p, int i )
{
Abc_EnumRef( p, p->pFans0[i] );
Abc_EnumRef( p, p->pFans1[i] );
p->nTops++;
p->nNodes++;
assert( i < p->nNodes );
}
static inline void Abc_EnumDerefNode( Abc_EnuMan_t * p, int i )
{
assert( i < p->nNodes );
Abc_EnumDeref( p, p->pFans0[i] );
Abc_EnumDeref( p, p->pFans1[i] );
p->nTops--;
p->nNodes--;
}
static inline void Abc_EnumPrintOne( Abc_EnuMan_t * p )
{
int i;
Kit_DsdPrintFromTruth( (unsigned *)(p->pTruths + p->nNodes - 1), p->nVars );
for ( i = p->nVars; i < p->nNodes; i++ )
if ( p->Polar[i] == 4 )
printf( " %c=%c+%c", 'a'+i, 'a'+p->pFans0[i], 'a'+p->pFans1[i] );
else
printf( " %c=%s%c%s%c", 'a'+i, p->fCompl0[i]?"!":"", 'a'+p->pFans0[i], p->fCompl1[i]?"!":"", 'a'+p->pFans1[i] );
printf( "\n" );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline int Abc_EnumEquiv( word a, word b )
{
return a == b || a == ~b;
}
static inline int Abc_EnumerateFilter( Abc_EnuMan_t * p )
{
int fUseFull = 1;
int n = p->nNodes;
int i = p->pFans0[n];
int k = p->pFans1[n], t;
word * pTruths = p->pTruths;
word uTruth = pTruths[n];
assert( i < k );
// skip constants
if ( Abc_EnumEquiv(uTruth, 0) )
return 1;
// skip equal ones
for ( t = 0; t < n; t++ )
if ( Abc_EnumEquiv(uTruth, pTruths[t]) )
return 1;
if ( fUseFull )
{
// skip those that can be derived by any pair
int a, b;
for ( a = 0; a <= i; a++ )
for ( b = a + 1; b <= k; b++ )
{
if ( a == i && b == k )
continue;
if ( Abc_EnumEquiv(uTruth, pTruths[a] & pTruths[b]) )
return 1;
if ( Abc_EnumEquiv(uTruth, pTruths[a] & ~pTruths[b]) )
return 1;
if ( Abc_EnumEquiv(uTruth, ~pTruths[a] & pTruths[b]) )
return 1;
if ( Abc_EnumEquiv(uTruth, ~pTruths[a] & ~pTruths[b]) )
return 1;
if ( p->fUseXor && Abc_EnumEquiv(uTruth, pTruths[a] ^ pTruths[b]) )
return 1;
}
}
else
{
// skip those that can be derived by fanin and any other one in the cone
int uTruthI = p->fCompl0[n] ? ~pTruths[i] : pTruths[i];
int uTruthK = p->fCompl1[n] ? ~pTruths[k] : pTruths[k];
assert( p->fUseXor == 0 );
for ( t = 0; t < k; t++ )
if ( Abc_EnumEquiv(uTruth, pTruths[t] & uTruthI) || Abc_EnumEquiv(uTruth, ~pTruths[t] & uTruthI) )
return 1;
for ( t = 0; t < i; t++ )
if ( Abc_EnumEquiv(uTruth, pTruths[t] & uTruthK) || Abc_EnumEquiv(uTruth, ~pTruths[t] & uTruthK) )
return 1;
}
return 0;
}
void Abc_EnumerateFuncs_rec( Abc_EnuMan_t * p, int fNew, int iNode1st ) // the first node on the last level
{
if ( p->nNodes == p->nNodeMax )
{
assert( p->nTops == 1 );
if ( p->fVerbose )
Abc_EnumPrintOne( p );
p->nFinished++;
return;
}
{
int i, k, c, cLim = 4 + p->fUseXor, n = p->nNodes;
int nRefedFans = p->nNodeMax - n + 1 - p->nTops;
int high0 = fNew ? iNode1st : p->pFans1[n-1];
int high1 = fNew ? n : iNode1st;
int low0 = fNew ? 0 : p->pFans0[n-1];
int c0 = fNew ? 0 : p->Polar[n-1];
int Level = p->pLevel[high0];
assert( p->nTops > 0 && p->nTops <= p->nNodeMax - n + 1 );
// go through nodes
for ( k = high0; k < high1; k++ )
{
if ( nRefedFans == 0 && p->pRefs[k] > 0 )
continue;
if ( p->pRefs[k] > 0 )
nRefedFans--;
assert( nRefedFans >= 0 );
// try second fanin
for ( i = (k == high0) ? low0 : 0; i < k; i++ )
{
if ( nRefedFans == 0 && p->pRefs[i] > 0 )
continue;
if ( Level == 0 && p->pRefs[i] == 0 && p->pRefs[k] == 0 && (i+1 != k || (i > 0 && p->pRefs[i-1] == 0)) ) // NPN
continue;
if ( p->pLevel[k] == 0 && p->pRefs[k] == 0 && p->pRefs[i] != 0 && k > 0 && p->pRefs[k-1] == 0 ) // NPN
continue;
// if ( p->pLevel[i] == 0 && p->pRefs[i] == 0 && p->pRefs[k] != 0 && i > 0 && p->pRefs[i-1] == 0 ) // NPN
// continue;
// try four polarities
for ( c = (k == high0 && i == low0 && !fNew) ? c0 + 1 : 0; c < cLim; c++ )
{
if ( p->pLevel[i] == 0 && p->pRefs[i] == 0 && (c & 1) == 1 ) // NPN
continue;
if ( p->pLevel[k] == 0 && p->pRefs[k] == 0 && (c & 2) == 2 ) // NPN
continue;
p->nTries++;
// create node
assert( i < k );
p->pFans0[n] = i;
p->pFans1[n] = k;
p->fCompl0[n] = c & 1;
p->fCompl1[n] = (c >> 1) & 1;
p->Polar[n] = c;
if ( c == 4 )
p->pTruths[n] = p->pTruths[i] ^ p->pTruths[k];
else
p->pTruths[n] = ((c & 1) ? ~p->pTruths[i] : p->pTruths[i]) & ((c & 2) ? ~p->pTruths[k] : p->pTruths[k]);
if ( Abc_EnumerateFilter(p) )
continue;
p->nBuilds++;
assert( Level == Abc_MaxInt(p->pLevel[i], p->pLevel[k]) );
p->pLevel[n] = Level + 1;
Abc_EnumRefNode( p, n );
Abc_EnumerateFuncs_rec( p, 0, fNew ? n : iNode1st );
Abc_EnumDerefNode( p, n );
assert( n == p->nNodes );
}
}
if ( p->pRefs[k] > 0 )
nRefedFans++;
}
if ( fNew )
return;
// start a new level
Abc_EnumerateFuncs_rec( p, 1, iNode1st );
}
}
void Abc_EnumerateFuncs( int nVars, int nGates, int fVerbose )
{
abctime clk = Abc_Clock();
Abc_EnuMan_t P, * p = &P;
int i;
if ( nVars > nGates + 1 )
{
printf( "The gate count %d is not enough to have functions with %d inputs.\n", nGates, nVars );
return;
}
assert( nVars >= 2 && nVars <= 6 );
assert( nGates > 0 && nVars + nGates < ABC_ENUM_MAX );
memset( p, 0, sizeof(Abc_EnuMan_t) );
p->fVerbose = fVerbose;
p->fUseXor = 0;
p->nVars = nVars;
p->nNodeMax = nVars + nGates;
p->nNodes = nVars;
p->nTops = nVars;
for ( i = 0; i < nVars; i++ )
p->pTruths[i] = s_Truths6[i];
Abc_EnumerateFuncs_rec( p, 1, 0 );
assert( p->nNodes == nVars );
assert( p->nTops == nVars );
// report statistics
printf( "Vars = %d. Gates = %d. Tries = %u. Builds = %u. Finished = %d. ",
nVars, nGates, (unsigned)p->nTries, (unsigned)p->nBuilds, (unsigned)p->nFinished );
Abc_PrintTime( 1, "Time", Abc_Clock() - clk );
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
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