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abc/src/opt/sfm/sfmLib.c

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/**CFile****************************************************************
FileName [sfmLib.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [SAT-based optimization using internal don't-cares.]
Synopsis [Preprocessing genlib library.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: sfmLib.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "sfmInt.h"
#include "misc/st/st.h"
#include "map/mio/mio.h"
#include "misc/vec/vecMem.h"
#include "misc/util/utilTruth.h"
#include "misc/extra/extra.h"
#include "map/mio/exp.h"
#include "opt/dau/dau.h"
#include "base/main/main.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
struct Sfm_Fun_t_
{
int Next; // next function in the list
int Area; // area of this function
char pFansT[8]; // top gate ID, followed by fanin perm
char pFansB[8]; // bottom gate ID, followed by fanin perm
};
struct Sfm_Lib_t_
{
Mio_Cell2_t * pCells; // library gates
int nCells; // library gate count
int nObjs; // object count
int nObjsAlloc; // object count
Sfm_Fun_t * pObjs; // objects
Vec_Mem_t * vTtMem; // truth tables
Vec_Int_t vLists; // lists of funcs for each truth table
Vec_Int_t vCounts; // counters of functions for each truth table
};
static inline Sfm_Fun_t * Sfm_LibFun( Sfm_Lib_t * p, int i ) { return i == -1 ? NULL : p->pObjs + i; }
#define Sfm_LibForEachSuper( p, pObj, Func ) \
for ( pObj = Sfm_LibFun(p, Vec_IntEntry(&p->vLists, Func)); pObj; pObj = Sfm_LibFun(p, pObj->Next) )
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Sfm_DecCreateCnf( Vec_Int_t * vGateSizes, Vec_Wrd_t * vGateFuncs, Vec_Wec_t * vGateCnfs )
{
Vec_Str_t * vCnf, * vCnfBase;
Vec_Int_t * vCover;
word uTruth;
int i, nCubes;
vCnf = Vec_StrAlloc( 100 );
vCover = Vec_IntAlloc( 100 );
Vec_WrdForEachEntry( vGateFuncs, uTruth, i )
{
nCubes = Sfm_TruthToCnf( uTruth, Vec_IntEntry(vGateSizes, i), vCover, vCnf );
vCnfBase = (Vec_Str_t *)Vec_WecEntry( vGateCnfs, i );
Vec_StrGrow( vCnfBase, Vec_StrSize(vCnf) );
memcpy( Vec_StrArray(vCnfBase), Vec_StrArray(vCnf), Vec_StrSize(vCnf) );
vCnfBase->nSize = Vec_StrSize(vCnf);
}
Vec_IntFree( vCover );
Vec_StrFree( vCnf );
}
/**Function*************************************************************
Synopsis [Preprocess the library.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Sfm_LibPreprocess( Mio_Library_t * pLib, Vec_Int_t * vGateSizes, Vec_Wrd_t * vGateFuncs, Vec_Wec_t * vGateCnfs, Vec_Ptr_t * vGateHands )
{
Mio_Gate_t * pGate;
int nGates = Mio_LibraryReadGateNum(pLib);
Vec_IntGrow( vGateSizes, nGates );
Vec_WrdGrow( vGateFuncs, nGates );
Vec_WecInit( vGateCnfs, nGates );
Vec_PtrGrow( vGateHands, nGates );
Mio_LibraryForEachGate( pLib, pGate )
{
Vec_IntPush( vGateSizes, Mio_GateReadPinNum(pGate) );
Vec_WrdPush( vGateFuncs, Mio_GateReadTruth(pGate) );
Mio_GateSetValue( pGate, Vec_PtrSize(vGateHands) );
Vec_PtrPush( vGateHands, pGate );
}
Sfm_DecCreateCnf( vGateSizes, vGateFuncs, vGateCnfs );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Sfm_LibFindComplInputGate( Vec_Wrd_t * vFuncs, int iGate, int nFanins, int iFanin, int * piFaninNew )
{
word uTruthGate = Vec_WrdEntry(vFuncs, iGate);
word uTruth, uTruthNew = Abc_Tt6Flip( uTruthGate, iFanin );
int i;
assert( iFanin >= 0 && iFanin < nFanins );
if ( piFaninNew ) *piFaninNew = iFanin;
Vec_WrdForEachEntry( vFuncs, uTruth, i )
if ( uTruth == uTruthNew )
return i;
if ( iFanin-1 >= 0 && Abc_Tt6SwapAdjacent(uTruthGate, iFanin-1) == uTruthGate ) // symmetric with prev
{
if ( piFaninNew ) *piFaninNew = iFanin-1;
uTruthNew = Abc_Tt6Flip( uTruthGate, iFanin-1 );
Vec_WrdForEachEntry( vFuncs, uTruth, i )
if ( uTruth == uTruthNew )
return i;
}
if ( iFanin+1 < nFanins && Abc_Tt6SwapAdjacent(uTruthGate, iFanin) == uTruthGate ) // symmetric with next
{
if ( piFaninNew ) *piFaninNew = iFanin+1;
uTruthNew = Abc_Tt6Flip( uTruthGate, iFanin+1 );
Vec_WrdForEachEntry( vFuncs, uTruth, i )
if ( uTruth == uTruthNew )
return i;
}
if ( piFaninNew ) *piFaninNew = -1;
return -1;
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Sfm_Lib_t * Sfm_LibStart( int nVars )
{
Sfm_Lib_t * p = ABC_CALLOC( Sfm_Lib_t, 1 );
p->vTtMem = Vec_MemAllocForTT( nVars, 0 );
Vec_IntGrow( &p->vLists, (1 << 16) );
Vec_IntGrow( &p->vCounts, (1 << 16) );
Vec_IntFill( &p->vLists, 2, -1 );
Vec_IntFill( &p->vCounts, 2, -1 );
p->nObjsAlloc = (1 << 16);
p->pObjs = ABC_CALLOC( Sfm_Fun_t, p->nObjsAlloc );
return p;
}
void Sfm_LibStop( Sfm_Lib_t * p )
{
Vec_MemHashFree( p->vTtMem );
Vec_MemFree( p->vTtMem );
Vec_IntErase( &p->vLists );
Vec_IntErase( &p->vCounts );
ABC_FREE( p->pCells );
ABC_FREE( p->pObjs );
ABC_FREE( p );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
word Sfm_LibTruthTwo( Mio_Cell2_t * pCellBot, Mio_Cell2_t * pCellTop, int InTop )
{
word uTruthBot = Exp_Truth6( pCellBot->nFanins, pCellBot->vExpr, NULL );
word uFanins[6]; int i, k;
assert( InTop >= 0 && InTop < (int)pCellTop->nFanins );
for ( i = 0, k = pCellBot->nFanins; i < (int)pCellTop->nFanins; i++ )
if ( i == InTop )
uFanins[i] = uTruthBot;
else
uFanins[i] = s_Truths6[k++];
assert( (int)pCellBot->nFanins + (int)pCellTop->nFanins == k + 1 );
uTruthBot = Exp_Truth6( pCellTop->nFanins, pCellTop->vExpr, uFanins );
return uTruthBot;
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Sfm_LibPrepareAdd( Sfm_Lib_t * p, word uTruth, int * Perm, int nFanins, Mio_Cell2_t * pCellBot, Mio_Cell2_t * pCellTop, int InTop )
{
Sfm_Fun_t * pObj;
int InvPerm[6], Area = (int)pCellBot->Area + (pCellTop ? (int)pCellTop->Area : 0);
int i, k, iFunc = Vec_MemHashInsert( p->vTtMem, &uTruth );
if ( iFunc == Vec_IntSize(&p->vLists) )
{
Vec_IntPush( &p->vLists, -1 );
Vec_IntPush( &p->vCounts, 0 );
}
assert( pCellBot != NULL );
// iterate through the supergates of this truth table
Sfm_LibForEachSuper( p, pObj, iFunc )
{
if ( Area >= pObj->Area )
return;
}
for ( k = 0; k < nFanins; k++ )
InvPerm[Perm[k]] = k;
// create new object
if ( p->nObjs == p->nObjsAlloc )
{
int nObjsAlloc = 2 * p->nObjsAlloc;
p->pObjs = ABC_REALLOC( Sfm_Fun_t, p->pObjs, nObjsAlloc );
memset( p->pObjs + p->nObjsAlloc, 0, sizeof(Sfm_Fun_t) * p->nObjsAlloc );
p->nObjsAlloc = nObjsAlloc;
}
pObj = p->pObjs + p->nObjs;
pObj->Area = Area;
pObj->Next = Vec_IntEntry(&p->vLists, iFunc);
Vec_IntWriteEntry( &p->vLists, iFunc, p->nObjs++ );
Vec_IntAddToEntry( &p->vCounts, iFunc, 1 );
// create gate
assert( pCellBot->Id < 128 );
pObj->pFansB[0] = (char)pCellBot->Id;
for ( k = 0; k < (int)pCellBot->nFanins; k++ )
pObj->pFansB[k+1] = InvPerm[k];
if ( pCellTop == NULL )
return;
assert( pCellTop->Id < 128 );
pObj->pFansT[0] = (char)pCellTop->Id;
for ( i = 0; i < (int)pCellTop->nFanins; i++ )
pObj->pFansT[i+1] = (char)(i == InTop ? 16 : InvPerm[k++]);
assert( k == nFanins );
}
Sfm_Lib_t * Sfm_LibPrepare( int nVars, int fTwo, int fVerbose )
{
abctime clk = Abc_Clock();
Sfm_Lib_t * p = Sfm_LibStart( nVars );
Mio_Cell2_t * pCell1, * pCell2, * pLimit;
int * pPerm[7], * Perm1, * Perm2, Perm[6];
int nPerms[7], i, f, n;
Vec_Int_t * vUseful;
word tTemp1, tCur;
char pRes[1000];
assert( nVars <= 6 );
// precompute gates
p->pCells = Mio_CollectRootsNewDefault2( nVars, &p->nCells, 0 );
pLimit = p->pCells + p->nCells;
// find useful ones
vUseful = Vec_IntStart( p->nCells );
// vUseful = Vec_IntStartFull( p->nCells );
for ( pCell1 = p->pCells + 4; pCell1 < pLimit; pCell1++ )
{
word uTruth = pCell1->uTruth;
if ( Dau_DsdDecompose(&uTruth, pCell1->nFanins, 0, 0, pRes) <= 3 )
Vec_IntWriteEntry( vUseful, pCell1 - p->pCells, 1 );
else
printf( "Skipping gate \"%s\" with non-DSD function %s\n", pCell1->pName, pRes );
}
// generate permutations
for ( i = 2; i <= nVars; i++ )
pPerm[i] = Extra_PermSchedule( i );
for ( i = 2; i <= nVars; i++ )
nPerms[i] = Extra_Factorial( i );
// add single cells
for ( pCell1 = p->pCells + 4; pCell1 < pLimit; pCell1++ )
if ( Vec_IntEntry(vUseful, pCell1 - p->pCells) )
{
int nFanins = pCell1->nFanins;
assert( nFanins >= 2 && nFanins <= 6 );
for ( i = 0; i < nFanins; i++ )
Perm[i] = i;
// permute truth table
tCur = tTemp1 = pCell1->uTruth;
for ( n = 0; n < nPerms[nFanins]; n++ )
{
Sfm_LibPrepareAdd( p, tCur, Perm, nFanins, pCell1, NULL, -1 );
// update
tCur = Abc_Tt6SwapAdjacent( tCur, pPerm[nFanins][n] );
Perm1 = Perm + pPerm[nFanins][n];
Perm2 = Perm1 + 1;
ABC_SWAP( int, *Perm1, *Perm2 );
}
assert( tTemp1 == tCur );
}
// add double cells
if ( fTwo )
for ( pCell1 = p->pCells + 4; pCell1 < pLimit; pCell1++ )
if ( Vec_IntEntry(vUseful, pCell1 - p->pCells) )
for ( pCell2 = p->pCells + 4; pCell2 < pLimit; pCell2++ )
if ( Vec_IntEntry(vUseful, pCell2 - p->pCells) )
if ( (int)pCell1->nFanins + (int)pCell2->nFanins <= nVars + 1 )
for ( f = 0; f < (int)pCell2->nFanins; f++ )
{
int nFanins = pCell1->nFanins + pCell2->nFanins - 1;
assert( nFanins >= 2 && nFanins <= nVars );
for ( i = 0; i < nFanins; i++ )
Perm[i] = i;
// permute truth table
tCur = tTemp1 = Sfm_LibTruthTwo( pCell1, pCell2, f );
for ( n = 0; n < nPerms[nFanins]; n++ )
{
Sfm_LibPrepareAdd( p, tCur, Perm, nFanins, pCell1, pCell2, f );
// update
tCur = Abc_Tt6SwapAdjacent( tCur, pPerm[nFanins][n] );
Perm1 = Perm + pPerm[nFanins][n];
Perm2 = Perm1 + 1;
ABC_SWAP( int, *Perm1, *Perm2 );
}
assert( tTemp1 == tCur );
}
// cleanup
for ( i = 2; i <= nVars; i++ )
ABC_FREE( pPerm[i] );
Vec_IntFree( vUseful );
if ( fVerbose )
{
printf( "Library processing: Var = %d. Cells = %d. Func = %6d. Obj = %8d. Ave = %8.2f ", nVars, p->nCells, Vec_MemEntryNum(p->vTtMem), p->nObjs, 1.0*p->nObjs/Vec_MemEntryNum(p->vTtMem) );
Abc_PrintTime( 1, "Time", Abc_Clock() - clk );
}
return p;
}
void Sfm_LibPrintGate( Mio_Cell2_t * pCell, char * pFanins, Mio_Cell2_t * pCell2, char * pFanins2 )
{
int k;
printf( " %s(", pCell->pName );
for ( k = 0; k < (int)pCell->nFanins; k++ )
if ( pFanins[k] == (char)16 )
Sfm_LibPrintGate( pCell2, pFanins2, NULL, NULL );
else
printf( " %c", 'a' + pFanins[k] );
printf( " )" );
}
void Sfm_LibPrintObj( Sfm_Lib_t * p, Sfm_Fun_t * pObj )
{
Mio_Cell2_t * pCellB = p->pCells + (int)pObj->pFansB[0];
Mio_Cell2_t * pCellT = p->pCells + (int)pObj->pFansT[0];
int nFanins = pCellB->nFanins + (pCellT == p->pCells ? 0 : pCellT->nFanins);
printf( " Area = %6.2f Fanins = %d ", MIO_NUMINV*pObj->Area, nFanins );
if ( pCellT == p->pCells )
Sfm_LibPrintGate( pCellB, pObj->pFansB + 1, NULL, NULL );
else
Sfm_LibPrintGate( pCellT, pObj->pFansT + 1, pCellB, pObj->pFansB + 1 );
printf( "\n" );
}
void Sfm_LibPrint( Sfm_Lib_t * p )
{
word * pTruth; Sfm_Fun_t * pObj; int iFunc;
Vec_MemForEachEntry( p->vTtMem, pTruth, iFunc )
{
if ( iFunc < 2 )
continue;
//if ( iFunc % 10000 )
// continue;
printf( "%d : Count = %d ", iFunc, Vec_IntEntry(&p->vCounts, iFunc) );
Dau_DsdPrintFromTruth( pTruth, Abc_TtSupportSize(pTruth, 6) );
Sfm_LibForEachSuper( p, pObj, iFunc )
Sfm_LibPrintObj( p, pObj );
}
}
void Sfm_LibTest( int nVars, int fTwo, int fVerbose )
{
Sfm_Lib_t * p = Sfm_LibPrepare( nVars, fTwo, 1 );
if ( fVerbose )
Sfm_LibPrint( p );
Sfm_LibStop( p );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Sfm_LibImplement( Sfm_Lib_t * p, word uTruth, int * pFanins, int nFanins, int AreaMffc, Vec_Int_t * vGates, Vec_Wec_t * vFanins )
{
Mio_Library_t * pLib = (Mio_Library_t *)Abc_FrameReadLibGen();
Mio_Gate_t * pGate;
Mio_Cell2_t * pCellB, * pCellT;
Vec_Int_t * vLevel;
Sfm_Fun_t * pObj, * pObjMin = NULL;
int i, iFunc;
if ( uTruth == 0 || uTruth == ~(word)0 )
{
assert( nFanins == 0 );
pGate = uTruth ? Mio_LibraryReadConst1(pLib) : Mio_LibraryReadConst0(pLib);
Vec_IntPush( vGates, Mio_GateReadValue(pGate) );
vLevel = Vec_WecPushLevel( vFanins );
return 1;
}
if ( uTruth == s_Truths6[0] || uTruth == ~s_Truths6[0] )
{
assert( nFanins == 1 );
pGate = uTruth == s_Truths6[0] ? Mio_LibraryReadBuf(pLib) : Mio_LibraryReadInv(pLib);
Vec_IntPush( vGates, Mio_GateReadValue(pGate) );
vLevel = Vec_WecPushLevel( vFanins );
Vec_IntPush( vLevel, pFanins[0] );
return 1;
}
// look for gate
iFunc = *Vec_MemHashLookup( p->vTtMem, &uTruth );
if ( iFunc == -1 )
return -1;
Sfm_LibForEachSuper( p, pObj, iFunc )
if ( !pObjMin || pObjMin->Area > pObj->Area )
pObjMin = pObj;
if ( pObjMin == NULL || pObjMin->Area >= AreaMffc )
return -1;
// get the gates
pCellB = p->pCells + (int)pObjMin->pFansB[0];
pCellT = p->pCells + (int)pObjMin->pFansT[0];
// create bottom gate
pGate = Mio_LibraryReadGateByName( pLib, pCellB->pName, NULL );
Vec_IntPush( vGates, Mio_GateReadValue(pGate) );
vLevel = Vec_WecPushLevel( vFanins );
for ( i = 0; i < (int)pCellB->nFanins; i++ )
Vec_IntPush( vLevel, pFanins[(int)pObjMin->pFansB[i+1]] );
if ( pCellT == p->pCells )
return 1;
// create top gate
pGate = Mio_LibraryReadGateByName( pLib, pCellT->pName, NULL );
Vec_IntPush( vGates, Mio_GateReadValue(pGate) );
vLevel = Vec_WecPushLevel( vFanins );
for ( i = 0; i < (int)pCellT->nFanins; i++ )
if ( pObjMin->pFansT[i+1] == (char)16 )
Vec_IntPush( vLevel, Vec_WecSize(vFanins)-2 );
else
Vec_IntPush( vLevel, pFanins[(int)pObjMin->pFansT[i+1]] );
return 2;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
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