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/**CFile****************************************************************
FileName [acecPolyn.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [CEC for arithmetic circuits.]
Synopsis [Polynomial extraction.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: acecPolyn.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "acecInt.h"
#include "misc/vec/vecWec.h"
#include "misc/vec/vecHsh.h"
#include "misc/vec/vecQue.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
/*
!a -> 1 - a
a & b -> ab
a | b -> a + b - ab
a ^ b -> a + b - 2ab
MUX(a, b, c) -> ab | (1 - a)c = ab + (1-a)c - ab(1-a)c = ab + c - ac
!a & b -> (1 - a)b = b - ab
a & !b -> a(1 - b) = a - ab
!a & !b -> 1 - a - b + ab
*/
typedef struct Pln_Man_t_ Pln_Man_t;
struct Pln_Man_t_
{
Gia_Man_t * pGia; // AIG manager
Hsh_VecMan_t * pHashC; // hash table for constants
Hsh_VecMan_t * pHashM; // hash table for monomials
Vec_Que_t * vQue; // queue by largest node
Vec_Flt_t * vCounts; // largest node
Vec_Int_t * vCoefs; // coefficients for each monomial
Vec_Int_t * vTempC[2]; // polynomial representation
Vec_Int_t * vTempM[4]; // polynomial representation
Vec_Int_t * vOrder; // order of collapsing
int nBuilds; // builds
};
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Int_t * Pln_ManSimpleOrder( Gia_Man_t * p )
{
Vec_Int_t * vOrder; int Id;
vOrder = Vec_IntStart( Gia_ManObjNum(p) );
Gia_ManForEachAndId( p, Id )
Vec_IntWriteEntry( vOrder, Id, Id );
return vOrder;
}
/**Function*************************************************************
Synopsis [Computation manager.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Pln_Man_t * Pln_ManAlloc( Gia_Man_t * pGia, Vec_Int_t * vOrder )
{
Pln_Man_t * p = ABC_CALLOC( Pln_Man_t, 1 );
p->pGia = pGia;
p->pHashC = Hsh_VecManStart( 1000 );
p->pHashM = Hsh_VecManStart( 1000 );
p->vQue = Vec_QueAlloc( 1000 );
p->vCounts = Vec_FltAlloc( 1000 );
p->vCoefs = Vec_IntAlloc( 1000 );
p->vTempC[0] = Vec_IntAlloc( 100 );
p->vTempC[1] = Vec_IntAlloc( 100 );
p->vTempM[0] = Vec_IntAlloc( 100 );
p->vTempM[1] = Vec_IntAlloc( 100 );
p->vTempM[2] = Vec_IntAlloc( 100 );
p->vTempM[3] = Vec_IntAlloc( 100 );
p->vOrder = vOrder ? vOrder : Vec_IntStartNatural( Gia_ManObjNum(pGia) );
assert( Vec_IntSize(p->vOrder) == Gia_ManObjNum(pGia) );
Vec_QueSetPriority( p->vQue, Vec_FltArrayP(p->vCounts) );
// add 0-constant and 1-monomial
Hsh_VecManAdd( p->pHashC, p->vTempC[0] );
Hsh_VecManAdd( p->pHashM, p->vTempM[0] );
Vec_FltPush( p->vCounts, 0 );
Vec_IntPush( p->vCoefs, 0 );
return p;
}
void Pln_ManStop( Pln_Man_t * p )
{
Hsh_VecManStop( p->pHashC );
Hsh_VecManStop( p->pHashM );
Vec_QueFree( p->vQue );
Vec_FltFree( p->vCounts );
Vec_IntFree( p->vCoefs );
Vec_IntFree( p->vTempC[0] );
Vec_IntFree( p->vTempC[1] );
Vec_IntFree( p->vTempM[0] );
Vec_IntFree( p->vTempM[1] );
Vec_IntFree( p->vTempM[2] );
Vec_IntFree( p->vTempM[3] );
//Vec_IntFree( p->vOrder );
ABC_FREE( p );
}
void Pln_ManPrintFinal( Pln_Man_t * p, int fVerbose, int fVeryVerbose )
{
Vec_Int_t * vArray;
int k, Entry, iMono, iConst, Count = 0;
Vec_IntForEachEntry( p->vCoefs, iConst, iMono )
{
if ( iConst == 0 )
continue;
Count++;
if ( !fVeryVerbose )
continue;
vArray = Hsh_VecReadEntry( p->pHashC, iConst );
Vec_IntForEachEntry( vArray, Entry, k )
printf( "%s%d", Entry < 0 ? "-" : "+", (1 << (Abc_AbsInt(Entry)-1)) );
vArray = Hsh_VecReadEntry( p->pHashM, iMono );
Vec_IntForEachEntry( vArray, Entry, k )
printf( " * %d", Entry );
printf( "\n" );
}
printf( "HashC = %d. HashM = %d. Total = %d. Used = %d.\n", Hsh_VecSize(p->pHashC), Hsh_VecSize(p->pHashM), p->nBuilds, Count );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline void Gia_PolynMergeConstOne( Vec_Int_t * vConst, int New )
{
int i, Old;
assert( New != 0 );
Vec_IntForEachEntry( vConst, Old, i )
{
assert( Old != 0 );
if ( Old == New ) // A == B
{
Vec_IntDrop( vConst, i );
Gia_PolynMergeConstOne( vConst, New > 0 ? New + 1 : New - 1 );
return;
}
if ( Abc_AbsInt(Old) == Abc_AbsInt(New) ) // A == -B
{
Vec_IntDrop( vConst, i );
return;
}
if ( Old + New == 1 || Old + New == -1 ) // sign(A) != sign(B) && abs(abs(A)-abs(B)) == 1
{
int Value = Abc_MinInt( Abc_AbsInt(Old), Abc_AbsInt(New) );
Vec_IntDrop( vConst, i );
Gia_PolynMergeConstOne( vConst, (Old + New == 1) ? Value : -Value );
return;
}
}
Vec_IntPushUniqueOrder( vConst, New );
}
static inline void Gia_PolynMergeConst( Vec_Int_t * vConst, Pln_Man_t * p, int iConstAdd )
{
int i, New;
Vec_Int_t * vConstAdd = Hsh_VecReadEntry( p->pHashC, iConstAdd );
Vec_IntForEachEntry( vConstAdd, New, i )
{
Gia_PolynMergeConstOne( vConst, New );
vConstAdd = Hsh_VecReadEntry( p->pHashC, iConstAdd );
}
}
static inline void Gia_PolynBuildAdd( Pln_Man_t * p, Vec_Int_t * vTempC, Vec_Int_t * vTempM )
{
int iConst, iMono = vTempM ? Hsh_VecManAdd(p->pHashM, vTempM) : 0;
p->nBuilds++;
if ( iMono == Vec_IntSize(p->vCoefs) ) // new monomial
{
iConst = Hsh_VecManAdd( p->pHashC, vTempC );
Vec_IntPush( p->vCoefs, iConst );
// Vec_FltPush( p->vCounts, Vec_IntEntryLast(vTempM) );
Vec_FltPush( p->vCounts, (float)Vec_IntEntry(p->vOrder, Vec_IntEntryLast(vTempM)) );
Vec_QuePush( p->vQue, iMono );
// Vec_QueUpdate( p->vQue, iMono );
return;
}
// this monomial exists
iConst = Vec_IntEntry( p->vCoefs, iMono );
if ( iConst )
Gia_PolynMergeConst( vTempC, p, iConst );
iConst = Hsh_VecManAdd( p->pHashC, vTempC );
Vec_IntWriteEntry( p->vCoefs, iMono, iConst );
}
void Gia_PolynBuildOne( Pln_Man_t * p, int iMono )
{
Gia_Obj_t * pObj;
Vec_Int_t * vArray, * vConst;
int iFan0, iFan1;
int k, iConst, iDriver;
assert( Vec_IntSize(p->vCoefs) == Hsh_VecSize(p->pHashM) );
vArray = Hsh_VecReadEntry( p->pHashM, iMono );
iDriver = Vec_IntEntryLast( vArray );
pObj = Gia_ManObj( p->pGia, iDriver );
if ( !Gia_ObjIsAnd(pObj) )
return;
iConst = Vec_IntEntry( p->vCoefs, iMono );
if ( iConst == 0 )
return;
Vec_IntWriteEntry( p->vCoefs, iMono, 0 );
iFan0 = Gia_ObjFaninId0p(p->pGia, pObj);
iFan1 = Gia_ObjFaninId1p(p->pGia, pObj);
for ( k = 0; k < 4; k++ )
{
Vec_IntClear( p->vTempM[k] );
Vec_IntAppend( p->vTempM[k], vArray );
Vec_IntPop( p->vTempM[k] );
if ( k == 1 || k == 3 )
Vec_IntPushUniqueOrderCost( p->vTempM[k], iFan0, p->vOrder ); // x
// Vec_IntPushUniqueOrder( p->vTempM[k], iFan0 ); // x
if ( k == 2 || k == 3 )
Vec_IntPushUniqueOrderCost( p->vTempM[k], iFan1, p->vOrder ); // y
// Vec_IntPushUniqueOrder( p->vTempM[k], iFan1 ); // y
}
vConst = Hsh_VecReadEntry( p->pHashC, iConst );
for ( k = 0; k < 2; k++ )
Vec_IntAppendMinus( p->vTempC[k], vConst, k );
if ( Gia_ObjFaninC0(pObj) && Gia_ObjFaninC1(pObj) ) // C * (1 - x) * (1 - y)
{
Gia_PolynBuildAdd( p, p->vTempC[0], p->vTempM[0] ); // C * 1
Gia_PolynBuildAdd( p, p->vTempC[1], p->vTempM[1] ); // -C * x
vConst = Hsh_VecReadEntry( p->pHashC, iConst );
for ( k = 0; k < 2; k++ )
Vec_IntAppendMinus( p->vTempC[k], vConst, k );
Gia_PolynBuildAdd( p, p->vTempC[1], p->vTempM[2] ); // -C * y
Gia_PolynBuildAdd( p, p->vTempC[0], p->vTempM[3] ); // C * x * y
}
else if ( Gia_ObjFaninC0(pObj) && !Gia_ObjFaninC1(pObj) ) // C * (1 - x) * y
{
Gia_PolynBuildAdd( p, p->vTempC[0], p->vTempM[2] ); // C * y
Gia_PolynBuildAdd( p, p->vTempC[1], p->vTempM[3] ); // -C * x * y
}
else if ( !Gia_ObjFaninC0(pObj) && Gia_ObjFaninC1(pObj) ) // C * x * (1 - y)
{
Gia_PolynBuildAdd( p, p->vTempC[0], p->vTempM[1] ); // C * x
Gia_PolynBuildAdd( p, p->vTempC[1], p->vTempM[3] ); // -C * x * y
}
else
Gia_PolynBuildAdd( p, p->vTempC[0], p->vTempM[3] ); // C * x * y
}
int Gia_PolyFindNext2( Pln_Man_t * p )
{
Gia_Obj_t * pObj;
Vec_Int_t * vArray;
int Max = 0, iBest = 0, iConst, iMono, iDriver;
Vec_IntForEachEntryStart( p->vCoefs, iConst, iMono, 1 )
{
if ( iConst == 0 )
continue;
vArray = Hsh_VecReadEntry( p->pHashM, iMono );
iDriver = Vec_IntEntryLast( vArray );
pObj = Gia_ManObj( p->pGia, iDriver );
if ( !Gia_ObjIsAnd(pObj) )
continue;
if ( Max < Vec_IntEntryLast(vArray) )
{
Max = Vec_IntEntryLast(vArray);
iBest = iMono;
}
}
//Vec_IntPrint( Hsh_VecReadEntry(p->pHashM, iBest) );
return iBest;
}
int Gia_PolyFindNext( Pln_Man_t * p )
{
int iBest = Vec_QueSize(p->vQue) ? Vec_QuePop(p->vQue) : 0;
//Vec_IntPrint( Hsh_VecReadEntry(p->pHashM, iBest) );
return iBest;
}
void Gia_PolynBuild( Gia_Man_t * pGia, Vec_Int_t * vOrder, int fVerbose, int fVeryVerbose )
{
abctime clk = Abc_Clock();//, clk2 = 0;
Gia_Obj_t * pObj;
Vec_Bit_t * vPres = Vec_BitStart( Gia_ManObjNum(pGia) );
int i, iMono, iDriver, LevPrev, LevCur, Iter, Line = 0;
Pln_Man_t * p = Pln_ManAlloc( pGia, vOrder );
Gia_ManForEachCoReverse( pGia, pObj, i )
{
Vec_IntFill( p->vTempC[0], 1, i+1 ); // 2^i
Vec_IntFill( p->vTempC[1], 1, -i-1 ); // -2^i
iDriver = Gia_ObjFaninId0p( pGia, pObj );
Vec_IntFill( p->vTempM[0], 1, iDriver ); // Driver
if ( Gia_ObjFaninC0(pObj) )
{
Gia_PolynBuildAdd( p, p->vTempC[0], NULL ); // C
Gia_PolynBuildAdd( p, p->vTempC[1], p->vTempM[0] ); // -C * Driver
}
else
Gia_PolynBuildAdd( p, p->vTempC[0], p->vTempM[0] ); // C * Driver
}
LevPrev = -1;
for ( Iter = 0; ; Iter++ )
{
Vec_Int_t * vTempM;
//abctime temp = Abc_Clock();
iMono = Gia_PolyFindNext(p);
if ( !iMono )
break;
// report
vTempM = Hsh_VecReadEntry( p->pHashM, iMono );
//printf( "Removing var %d\n", Vec_IntEntryLast(vTempM) );
LevCur = Vec_IntEntryLast(vTempM);
if ( !Gia_ObjIsAnd(Gia_ManObj(pGia, LevCur)) )
continue;
if ( LevPrev != LevCur )
{
if ( Vec_BitEntry( vPres, LevCur ) && fVerbose )
printf( "Repeating entry %d\n", LevCur );
else
Vec_BitSetEntry( vPres, LevCur, 1 );
if ( fVerbose )
printf( "Line%5d Iter%10d : Obj =%6d. Order =%6d. HashC =%6d. HashM =%10d. Total =%10d. Used =%6d.\n",
Line++, Iter, LevCur, Vec_IntEntry(p->vOrder, LevCur), Hsh_VecSize(p->pHashC), Hsh_VecSize(p->pHashM), p->nBuilds, -1 );
}
LevPrev = LevCur;
Gia_PolynBuildOne( p, iMono );
//clk2 += Abc_Clock() - temp;
}
Abc_PrintTime( 1, "Time", Abc_Clock() - clk );
//Abc_PrintTime( 1, "Time2", clk2 );
Pln_ManPrintFinal( p, fVerbose, fVeryVerbose );
Pln_ManStop( p );
Vec_BitFree( vPres );
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
|
