luke
/
abc
mirror of https://github.com/YosysHQ/abc.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Version abc61210

This commit is contained in:
Alan Mishchenko 2006-12-10 08:01:00 -08:00
parent b9abf9c00c
commit ae037e4503
24 changed files with 892 additions and 485 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
abc.dsp
View File

@ -1854,10 +1854,6 @@ SOURCE=.\src\map\if\ifCut.c
# End Source File
# Begin Source File
SOURCE=.\src\map\if\ifLib.c
# End Source File
# Begin Source File
SOURCE=.\src\map\if\ifMan.c
# End Source File
# Begin Source File
@ -1878,6 +1874,10 @@ SOURCE=.\src\map\if\ifSeq.c
# End Source File
# Begin Source File
SOURCE=.\src\map\if\ifTime.c
# End Source File
# Begin Source File
SOURCE=.\src\map\if\ifTruth.c
# End Source File
# Begin Source File

1
abc.rc
View File

@ -30,6 +30,7 @@ alias fs fraig_sweep
alias fsto fraig_store
alias fres fraig_restore
alias ft fraig_trust
alias ifs if -s
alias pex print_exdc -d
alias pf print_factor
alias pfan print_fanio

4
src/base/abc/abcCheck.c
View File

@ -111,7 +111,7 @@ bool Abc_NtkDoCheck( Abc_Ntk_t * pNtk )
return 0;
}
}
/*
// check CI/CO numbers
if ( Abc_NtkPiNum(pNtk) + Abc_NtkLatchNum(pNtk) != Abc_NtkCiNum(pNtk) )
{
@ -127,7 +127,7 @@ bool Abc_NtkDoCheck( Abc_Ntk_t * pNtk )
fprintf( stdout, "in procedure Abc_NtkCreateObj() and in the user's code.\n" );
return 0;
}
*/
// check the names
if ( !Abc_NtkCheckNames( pNtk ) )
return 0;

38
src/base/abci/abc.c
View File

@ -7529,25 +7529,26 @@ int Abc_CommandIf( Abc_Frame_t * pAbc, int argc, char ** argv )
memset( pPars, 0, sizeof(If_Par_t) );
// user-controlable paramters
pPars->nLutSize = 4;
pPars->nCutsMax = 10;
pPars->nCutsMax = 8;
pPars->DelayTarget = -1;
pPars->fPreprocess = 1;
pPars->fArea = 0;
pPars->fFancy = 0;
pPars->fExpRed = 1;
pPars->fLatchPaths = 0;
pPars->fSeq = 0;
pPars->fSeqMap = 0;
pPars->fVerbose = 0;
// internal parameters
pPars->fTruth = 0;
pPars->nLatches = pNtk? Abc_NtkLatchNum(pNtk) : 0;
pPars->fLiftLeaves = 0;
pPars->pLutLib = NULL; // Abc_FrameReadLibLut();
pPars->pTimesArr = NULL;
pPars->pTimesArr = NULL;
pPars->pFuncCost = NULL;
Extra_UtilGetoptReset();
while ( ( c = Extra_UtilGetopt( argc, argv, "KCDpaflrsvh" ) ) != EOF )
while ( ( c = Extra_UtilGetopt( argc, argv, "KCDpaflrstvh" ) ) != EOF )
{
switch ( c )
{
@ -7600,7 +7601,10 @@ int Abc_CommandIf( Abc_Frame_t * pAbc, int argc, char ** argv )
pPars->fExpRed ^= 1;
break;
case 's':
pPars->fSeq ^= 1;
pPars->fSeqMap ^= 1;
break;
case 't':
pPars->fLiftLeaves ^= 1;
break;
case 'v':
pPars->fVerbose ^= 1;
@ -7616,12 +7620,18 @@ int Abc_CommandIf( Abc_Frame_t * pAbc, int argc, char ** argv )
fprintf( pErr, "Empty network.\n" );
return 1;
}
/*
if ( pPars->fSeq )
{
fprintf( pErr, "Sequential mapping is currently being implemented.\n" );
return 1;
}
*/
if ( pPars->fSeqMap && pPars->nLatches == 0 )
{
fprintf( pErr, "The network has no latches. Use combinational mapping instead of sequential.\n" );
return 1;
}
if ( pPars->nLutSize < 3 || pPars->nLutSize > IF_MAX_LUTSIZE )
{
@ -7649,13 +7659,6 @@ int Abc_CommandIf( Abc_Frame_t * pAbc, int argc, char ** argv )
return 1;
}
// set the latch paths
if ( pPars->fLatchPaths )
{
for ( c = 0; c < Abc_NtkPiNum(pNtk); c++ )
pPars->pTimesArr[c] = -ABC_INFINITY;
}
if ( !Abc_NtkIsStrash(pNtk) )
{
// strash and balance the network
@ -7679,7 +7682,7 @@ int Abc_CommandIf( Abc_Frame_t * pAbc, int argc, char ** argv )
{
Abc_NtkDelete( pNtk );
fprintf( pErr, "FPGA mapping has failed.\n" );
return 1;
return 0;
}
Abc_NtkDelete( pNtk );
}
@ -7690,7 +7693,7 @@ int Abc_CommandIf( Abc_Frame_t * pAbc, int argc, char ** argv )
if ( pNtkRes == NULL )
{
fprintf( pErr, "FPGA mapping has failed.\n" );
return 1;
return 0;
}
}
// replace the current network
@ -7706,17 +7709,18 @@ usage:
sprintf( LutSize, "library" );
else
sprintf( LutSize, "%d", pPars->nLutSize );
fprintf( pErr, "usage: if [-K num] [-C num] [-D float] [-pafrsvh]\n" );
fprintf( pErr, "usage: if [-K num] [-C num] [-D float] [-pafrstvh]\n" );
fprintf( pErr, "\t performs FPGA technology mapping of the network\n" );
fprintf( pErr, "\t-K num : the number of LUT inputs (2 < num < %d) [default = %s]\n", IF_MAX_LUTSIZE+1, LutSize );
fprintf( pErr, "\t-C num : the max number of cuts to use (1 < num < 2^12) [default = %d]\n", pPars->nCutsMax );
fprintf( pErr, "\t-D float : sets the delay constraint for the mapping [default = %s]\n", Buffer );
fprintf( pErr, "\t-p : toggles preprocessing using several starting points [default = %s]\n", pPars->fPreprocess? "yes": "no" );
fprintf( pErr, "\t-a : toggles area-oriented mapping [default = %s]\n", pPars->fArea? "yes": "no" );
fprintf( pErr, "\t-f : toggles one fancy feature [default = %s]\n", pPars->fFancy? "yes": "no" );
// fprintf( pErr, "\t-f : toggles one fancy feature [default = %s]\n", pPars->fFancy? "yes": "no" );
fprintf( pErr, "\t-r : enables expansion/reduction of the best cuts [default = %s]\n", pPars->fExpRed? "yes": "no" );
fprintf( pErr, "\t-l : optimizes latch paths for delay, other paths for area [default = %s]\n", pPars->fLatchPaths? "yes": "no" );
fprintf( pErr, "\t-s : toggles sequential mapping [default = %s]\n", pPars->fSeq? "yes": "no" );
fprintf( pErr, "\t-s : toggles sequential mapping [default = %s]\n", pPars->fSeqMap? "yes": "no" );
fprintf( pErr, "\t-t : toggles the use of true sequential cuts [default = %s]\n", pPars->fLiftLeaves? "yes": "no" );
fprintf( pErr, "\t-v : toggles verbose output [default = %s]\n", pPars->fVerbose? "yes": "no" );
fprintf( pErr, "\t-h : prints the command usage\n");
return 1;

2
src/base/abci/abcFraig.c
View File

@ -117,7 +117,7 @@ void * Abc_NtkToFraig( Abc_Ntk_t * pNtk, void * pParams, int fAllNodes, int fExd
// create PIs and remember them in the old nodes
Abc_NtkForEachCi( pNtk, pNode, i )
pNode->pCopy = (Abc_Obj_t *)Fraig_ManReadIthVar(pMan, i);
// perform strashing
vNodes = Abc_AigDfs( pNtk, fAllNodes, 0 );
if ( !fInternal )

22
src/base/abci/abcIf.c
View File

@ -58,6 +58,14 @@ Abc_Ntk_t * Abc_NtkIf( Abc_Ntk_t * pNtk, If_Par_t * pPars )
pPars->pTimesArr = Abc_NtkGetCiArrivalFloats(pNtk);
pPars->pTimesReq = NULL;
// set the latch paths
if ( pPars->fLatchPaths && pPars->pTimesArr )
{
int c;
for ( c = 0; c < Abc_NtkPiNum(pNtk); c++ )
pPars->pTimesArr[c] = -ABC_INFINITY;
}
// perform FPGA mapping
pIfMan = Abc_NtkToIf( pNtk, pPars );
if ( pIfMan == NULL )
@ -117,7 +125,10 @@ If_Man_t * Abc_NtkToIf( Abc_Ntk_t * pNtk, If_Par_t * pPars )
// create PIs and remember them in the old nodes
Abc_AigConst1(pNtk)->pCopy = (Abc_Obj_t *)If_ManConst1( pIfMan );
Abc_NtkForEachCi( pNtk, pNode, i )
pNode->pCopy = (Abc_Obj_t *)If_ManCreatePi( pIfMan );
{
pNode->pCopy = (Abc_Obj_t *)If_ManCreateCi( pIfMan );
//printf( "AIG CI %2d -> IF CI %2d\n", pNode->Id, ((If_Obj_t *)pNode->pCopy)->Id );
}
// load the AIG into the mapper
pProgress = Extra_ProgressBarStart( stdout, Abc_NtkObjNumMax(pNtk) );
@ -136,13 +147,14 @@ If_Man_t * Abc_NtkToIf( Abc_Ntk_t * pNtk, If_Par_t * pPars )
If_ObjSetChoice( (If_Obj_t *)pPrev->pCopy, (If_Obj_t *)pFanin->pCopy );
If_ManCreateChoice( pIfMan, (If_Obj_t *)pNode->pCopy );
}
//printf( "AIG node %2d -> IF node %2d\n", pNode->Id, ((If_Obj_t *)pNode->pCopy)->Id );
}
Extra_ProgressBarStop( pProgress );
Vec_PtrFree( vNodes );
// set the primary outputs without copying the phase
Abc_NtkForEachCo( pNtk, pNode, i )
If_ManCreatePo( pIfMan, (If_Obj_t *)Abc_ObjFanin0(pNode)->pCopy, Abc_ObjFaninC0(pNode) );
If_ManCreateCo( pIfMan, (If_Obj_t *)Abc_ObjFanin0(pNode)->pCopy, Abc_ObjFaninC0(pNode) );
return pIfMan;
}
@ -177,15 +189,15 @@ Abc_Ntk_t * Abc_NtkFromIf( If_Man_t * pIfMan, Abc_Ntk_t * pNtk )
// make the mapper point to the new network
If_ObjSetCopy( If_ManConst1(pIfMan), Abc_NtkCreateNodeConst1(pNtkNew) );
Abc_NtkForEachCi( pNtk, pNode, i )
If_ObjSetCopy( If_ManPi(pIfMan, i), pNode->pCopy );
If_ObjSetCopy( If_ManCi(pIfMan, i), pNode->pCopy );
// process the nodes in topological order
vCover = Vec_IntAlloc( 1 << 16 );
pProgress = Extra_ProgressBarStart( stdout, Abc_NtkCoNum(pNtk) );
Abc_NtkForEachCo( pNtk, pNode, i )
{
Extra_ProgressBarUpdate( pProgress, i, "Final" );
pNodeNew = Abc_NodeFromIf_rec( pNtkNew, pIfMan, If_ObjFanin0(If_ManPo(pIfMan, i)), vCover );
pNodeNew = Abc_ObjNotCond( pNodeNew, If_ObjFaninC0(If_ManPo(pIfMan, i)) );
pNodeNew = Abc_NodeFromIf_rec( pNtkNew, pIfMan, If_ObjFanin0(If_ManCo(pIfMan, i)), vCover );
pNodeNew = Abc_ObjNotCond( pNodeNew, If_ObjFaninC0(If_ManCo(pIfMan, i)) );
Abc_ObjAddFanin( pNode->pCopy, pNodeNew );
}
Extra_ProgressBarStop( pProgress );

8
src/base/abci/abcPrint.c
View File

@ -118,15 +118,19 @@ void Abc_NtkPrintStats( FILE * pFile, Abc_Ntk_t * pNtk, int fFactored )
fprintf( pFile, " lev = %3d", Abc_NtkLevel(pNtk) );
fprintf( pFile, "\n" );
// print the statistic into a file
/*
{
FILE * pTable;
pTable = fopen( "stats.txt", "a+" );
pTable = fopen( "a/seqmap__stats.txt", "a+" );
fprintf( pTable, "%s ", pNtk->pName );
fprintf( pTable, "%d ", Abc_NtkPiNum(pNtk) );
fprintf( pTable, "%d ", Abc_NtkPoNum(pNtk) );
fprintf( pTable, "%d ", Abc_NtkLatchNum(pNtk) );
fprintf( pTable, "%d ", Abc_NtkNodeNum(pNtk) );
fprintf( pTable, "%d ", Abc_AigLevel(pNtk) );
fprintf( pTable, "%d ", Abc_NtkLevel(pNtk) );
fprintf( pTable, "\n" );
fclose( pTable );
}

7
src/base/abci/abcRenode.c
View File

@ -56,6 +56,9 @@ Abc_Ntk_t * Abc_NtkRenode( Abc_Ntk_t * pNtk, int nFaninMax, int nCubeMax, int fA
If_Par_t Pars, * pPars = &Pars;
Abc_Ntk_t * pNtkNew;
if ( Abc_NtkGetChoiceNum( pNtk ) )
printf( "Performing renoding with choices.\n" );
// set defaults
memset( pPars, 0, sizeof(If_Par_t) );
// user-controlable paramters
@ -67,11 +70,11 @@ Abc_Ntk_t * Abc_NtkRenode( Abc_Ntk_t * pNtk, int nFaninMax, int nCubeMax, int fA
pPars->fFancy = 0;
pPars->fExpRed = 0; //
pPars->fLatchPaths = 0;
pPars->fSeq = 0;
pPars->fSeqMap = 0;
pPars->fVerbose = fVerbose;
// internal parameters
pPars->fTruth = 1;
pPars->fUsePerm = 1; //!fUseSops;
pPars->fUsePerm = 1;
pPars->nLatches = 0;
pPars->pLutLib = NULL; // Abc_FrameReadLibLut();
pPars->pTimesArr = NULL;

10
src/base/abci/abcStrash.c
View File

@ -151,7 +151,8 @@ Abc_Ntk_t * Abc_NtkStrash( Abc_Ntk_t * pNtk, bool fAllNodes, bool fCleanup )
int Abc_NtkAppend( Abc_Ntk_t * pNtk1, Abc_Ntk_t * pNtk2, int fAddPos )
{
Abc_Obj_t * pObj;
int i;
char * pName;
int i, nNewCis;
// the first network should be an AIG
assert( Abc_NtkIsStrash(pNtk1) );
assert( Abc_NtkIsLogic(pNtk2) || Abc_NtkIsStrash(pNtk2) );
@ -165,13 +166,20 @@ int Abc_NtkAppend( Abc_Ntk_t * pNtk1, Abc_Ntk_t * pNtk2, int fAddPos )
if ( !Abc_NtkCompareSignals( pNtk1, pNtk2, 1, 1 ) )
printf( "Abc_NtkAppend(): The union of the network PIs is computed (warning).\n" );
// perform strashing
nNewCis = 0;
Abc_NtkCleanCopy( pNtk2 );
Abc_NtkForEachCi( pNtk2, pObj, i )
{
pName = Abc_ObjName(pObj);
pObj->pCopy = Abc_NtkFindCi(pNtk1, Abc_ObjName(pObj));
if ( pObj->pCopy == NULL )
{
pObj->pCopy = Abc_NtkDupObj(pNtk1, pObj, 1);
nNewCis++;
}
}
if ( nNewCis )
printf( "Warning: Procedure Abc_NtkAppend() added %d new CIs.\n", nNewCis );
// add pNtk2 to pNtk1 while strashing
if ( Abc_NtkIsLogic(pNtk2) )
Abc_NtkStrashPerform( pNtk2, pNtk1, 1 );

101
src/map/if/if.h
View File

@ -50,8 +50,8 @@ extern "C" {
typedef enum {
IF_NONE, // 0: non-existent object
IF_CONST1, // 1: constant 1
IF_PI, // 2: primary input
IF_PO, // 3: primary output
IF_CI, // 2: combinational input
IF_CO, // 3: combinational output
IF_AND, // 4: AND node
IF_BI, // 5: box input
IF_BO, // 6: box output
@ -63,9 +63,9 @@ typedef enum {
/// BASIC TYPES ///
////////////////////////////////////////////////////////////////////////
typedef struct If_Man_t_ If_Man_t;
typedef struct If_Par_t_ If_Par_t;
typedef struct If_Lib_t_ If_Lib_t;
typedef struct If_Man_t_ If_Man_t;
typedef struct If_Obj_t_ If_Obj_t;
typedef struct If_Cut_t_ If_Cut_t;
@ -81,7 +81,7 @@ struct If_Par_t_
int fFancy; // a fancy feature
int fExpRed; // expand/reduce of the best cuts
int fLatchPaths; // reset timing on latch paths
int fSeq; // sequential mapping
int fSeqMap; // sequential mapping
int fVerbose; // the verbosity flag
// internal parameters
int fTruth; // truth table computation enabled
@ -89,6 +89,7 @@ struct If_Par_t_
int fUseBdds; // sets local BDDs at the nodes
int fUseSops; // sets local SOPs at the nodes
int nLatches; // the number of latches in seq mapping
int fLiftLeaves; // shift the leaves for seq mapping
If_Lib_t * pLutLib; // the LUT library
float * pTimesArr; // arrival times
float * pTimesReq; // required times
@ -113,8 +114,8 @@ struct If_Man_t_
If_Par_t * pPars;
// mapping nodes
If_Obj_t * pConst1; // the constant 1 node
Vec_Ptr_t * vPis; // the primary inputs
Vec_Ptr_t * vPos; // the primary outputs
Vec_Ptr_t * vCis; // the primary inputs
Vec_Ptr_t * vCos; // the primary outputs
Vec_Ptr_t * vObjs; // all objects
Vec_Ptr_t * vMapped; // objects used in the mapping
Vec_Ptr_t * vTemp; // temporary array
@ -126,10 +127,13 @@ struct If_Man_t_
float AreaGlo; // global area
int nCutsUsed; // the number of cuts currently used
int nCutsMerged; // the total number of cuts merged
int nCutsSaved; // the total number of cuts saved
int nCutsMax; // the maximum number of cuts at a node
float Fi; // the current value of the clock period (for seq mapping)
unsigned * puTemp[4]; // used for the truth table computation
// sequential mapping
Vec_Ptr_t * vLatchOrder; // topological ordering of latches
Vec_Int_t * vLags; // sequentail lags of all nodes
int nAttempts; // the number of attempts in binary search
int nMaxIters; // the maximum number of iterations
int Period; // the current value of the clock period (for seq mapping)
// memory management
Mem_Fixed_t * pMem; // memory manager
int nEntrySize; // the size of the entry
@ -168,7 +172,8 @@ struct If_Obj_t_
unsigned fPhase : 1; // phase of the node
unsigned fRepr : 1; // representative of the equivalence class
unsigned fMark : 1; // multipurpose mark
unsigned Level : 23; // logic level of the node
unsigned fVisit : 1; // multipurpose mark
unsigned Level : 22; // logic level of the node
int Id; // integer ID
int nRefs; // the number of references
int nCuts; // the number of cuts
@ -182,19 +187,21 @@ struct If_Obj_t_
};
static inline If_Obj_t * If_ManConst1( If_Man_t * p ) { return p->pConst1; }
static inline If_Obj_t * If_ManPi( If_Man_t * p, int i ) { return (If_Obj_t *)Vec_PtrEntry( p->vPis, i ); }
static inline If_Obj_t * If_ManPo( If_Man_t * p, int i ) { return (If_Obj_t *)Vec_PtrEntry( p->vPos, i ); }
static inline If_Obj_t * If_ManCi( If_Man_t * p, int i ) { return (If_Obj_t *)Vec_PtrEntry( p->vCis, i ); }
static inline If_Obj_t * If_ManCo( If_Man_t * p, int i ) { return (If_Obj_t *)Vec_PtrEntry( p->vCos, i ); }
static inline If_Obj_t * If_ManObj( If_Man_t * p, int i ) { return (If_Obj_t *)Vec_PtrEntry( p->vObjs, i ); }
static inline If_Cut_t * If_ManCut( If_Man_t * p, int i ) { return p->ppCuts[i]; }
static inline int If_ManPiNum( If_Man_t * p ) { return p->nObjs[IF_PI]; }
static inline int If_ManPoNum( If_Man_t * p ) { return p->nObjs[IF_PO]; }
static inline int If_ManCiNum( If_Man_t * p ) { return p->nObjs[IF_CI]; }
static inline int If_ManCoNum( If_Man_t * p ) { return p->nObjs[IF_CO]; }
static inline int If_ManAndNum( If_Man_t * p ) { return p->nObjs[IF_AND]; }
static inline int If_ManObjNum( If_Man_t * p ) { return Vec_PtrSize(p->vObjs); }
static inline int If_ObjIsConst1( If_Obj_t * pObj ) { return pObj->Type == IF_CONST1; }
static inline int If_ObjIsPi( If_Obj_t * pObj ) { return pObj->Type == IF_PI; }
static inline int If_ObjIsPo( If_Obj_t * pObj ) { return pObj->Type == IF_PO; }
static inline int If_ObjIsCi( If_Obj_t * pObj ) { return pObj->Type == IF_CI; }
static inline int If_ObjIsCo( If_Obj_t * pObj ) { return pObj->Type == IF_CO; }
static inline int If_ObjIsPi( If_Obj_t * pObj ) { return If_ObjIsCi(pObj) && pObj->pFanin0 == NULL; }
static inline int If_ObjIsLatch( If_Obj_t * pObj ) { return If_ObjIsCi(pObj) && pObj->pFanin0 != NULL; }
static inline int If_ObjIsAnd( If_Obj_t * pObj ) { return pObj->Type == IF_AND; }
static inline int If_ObjIsBi( If_Obj_t * pObj ) { return pObj->Type == IF_BI; }
static inline int If_ObjIsBo( If_Obj_t * pObj ) { return pObj->Type == IF_BO; }
@ -210,9 +217,12 @@ static inline void If_ObjSetChoice( If_Obj_t * pObj, If_Obj_t * pEqu ) { p
static inline If_Cut_t * If_ObjCut( If_Obj_t * pObj, int iCut ) { return pObj->Cuts + iCut; }
static inline If_Cut_t * If_ObjCutTriv( If_Obj_t * pObj ) { return pObj->Cuts; }
static inline If_Cut_t * If_ObjCutBest( If_Obj_t * pObj ) { return pObj->Cuts + 1; }
static inline If_Cut_t * If_ObjCutBest( If_Obj_t * pObj ) { return pObj->Cuts + (int)(pObj->nCuts > 1); }
static inline unsigned If_ObjCutSign( unsigned ObjId ) { return (1 << (ObjId % 31)); }
static inline float If_ObjLValue( If_Obj_t * pObj ) { return If_ObjCutTriv(pObj)->Delay; }
static inline void If_ObjSetLValue( If_Obj_t * pObj, float LValue ) { If_ObjCutTriv(pObj)->Delay = LValue; }
static inline void * If_CutData( If_Cut_t * pCut ) { return *(void **)pCut; }
static inline void If_CutSetData( If_Cut_t * pCut, void * pData ) { *(void **)pCut = pData; }
@ -227,23 +237,29 @@ static inline float If_CutLutArea( If_Man_t * p, If_Cut_t * pCut ) { r
/// MACRO DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
#define IF_MIN(a,b) (((a) < (b))? (a) : (b))
#define IF_MAX(a,b) (((a) > (b))? (a) : (b))
#define IF_MIN(a,b) (((a) < (b))? (a) : (b))
#define IF_MAX(a,b) (((a) > (b))? (a) : (b))
// the small and large numbers (min/max float are 1.17e-38/3.40e+38)
#define IF_FLOAT_LARGE ((float)1.0e+20)
#define IF_FLOAT_SMALL ((float)1.0e-20)
#define IF_INT_LARGE (10000000)
// iterator over the primary inputs
#define If_ManForEachCi( p, pObj, i ) \
Vec_PtrForEachEntry( p->vCis, pObj, i )
// iterator over the primary outputs
#define If_ManForEachCo( p, pObj, i ) \
Vec_PtrForEachEntry( p->vCos, pObj, i )
// iterator over the primary inputs
#define If_ManForEachPi( p, pObj, i ) \
Vec_PtrForEachEntry( p->vPis, pObj, i )
Vec_PtrForEachEntryStop( p->vCis, pObj, i, If_ManCiNum(p) - p->pPars->nLatches )
// iterator over the primary outputs
#define If_ManForEachPo( p, pObj, i ) \
Vec_PtrForEachEntry( p->vPos, pObj, i )
Vec_PtrForEachEntryStop( p->vCos, pObj, i, If_ManCoNum(p) - p->pPars->nLatches )
// iterator over the latches
#define If_ManForEachLatch( p, pObj, i ) \
Vec_PtrForEachEntryStart( p->vPos, pObj, i, If_ManPoNum(p) - p->pPars->nLatches )
Vec_PtrForEachEntryStart( p->vCos, pObj, i, If_ManCoNum(p) - p->pPars->nLatches )
// iterator over all objects, including those currently not used
#define If_ManForEachObj( p, pObj, i ) \
Vec_PtrForEachEntry( p->vObjs, pObj, i )
@ -256,17 +272,22 @@ static inline float If_CutLutArea( If_Man_t * p, If_Cut_t * pCut ) { r
// iterator over cuts of the node
#define If_ObjForEachCutStart( pObj, pCut, i, Start ) \
for ( i = Start; (i < (int)(pObj)->nCuts) && ((pCut) = (pObj)->Cuts + i); i++ )
// iterator leaves of the cut
// iterator over the leaves of the cut
//#define If_CutForEachLeaf( p, pCut, pLeaf, i ) \
// for ( i = 0; (i < (int)(pCut)->nLeaves) && ((pLeaf) = If_ManObj(p, (pCut)->pLeaves[i])); i++ )
#define If_CutForEachLeaf( p, pCut, pLeaf, i ) \
for ( i = 0; (i < (int)(pCut)->nLeaves) && ((pLeaf) = If_ManObj(p, (pCut)->pLeaves[i])); i++ )
for ( i = 0; (i < (int)(pCut)->nLeaves) && ((pLeaf) = If_ManObj(p, p->pPars->fLiftLeaves? (pCut)->pLeaves[i] >> 8 : (pCut)->pLeaves[i])); i++ )
// iterator over the leaves of the sequential cut
#define If_CutForEachLeafSeq( p, pCut, pLeaf, Shift, i ) \
for ( i = 0; (i < (int)(pCut)->nLeaves) && ((pLeaf) = If_ManObj(p, (pCut)->pLeaves[i] >> 8)) && (((Shift) = ((pCut)->pLeaves[i] & 255)) >= 0); i++ )
////////////////////////////////////////////////////////////////////////
/// FUNCTION DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
/*=== ifCore.c ==========================================================*/
/*=== ifCore.c ===========================================================*/
extern int If_ManPerformMapping( If_Man_t * p );
/*=== ifCut.c ==========================================================*/
/*=== ifCut.c ============================================================*/
extern float If_CutAreaDerefed( If_Man_t * p, If_Cut_t * pCut, int nLevels );
extern float If_CutAreaRefed( If_Man_t * p, If_Cut_t * pCut, int nLevels );
extern float If_CutDeref( If_Man_t * p, If_Cut_t * pCut, int nLevels );
@ -277,35 +298,39 @@ extern float If_CutFlow( If_Man_t * p, If_Cut_t * pCut );
extern float If_CutAverageRefs( If_Man_t * p, If_Cut_t * pCut );
extern int If_CutFilter( If_Man_t * p, If_Cut_t * pCut );
extern int If_CutMerge( If_Cut_t * pCut0, If_Cut_t * pCut1, If_Cut_t * pCut );
extern void If_CutLift( If_Cut_t * pCut );
extern void If_CutCopy( If_Cut_t * pCutDest, If_Cut_t * pCutSrc );
extern void If_ManSortCuts( If_Man_t * p, int Mode );
/*=== ifLib.c ==========================================================*/
extern float If_CutDelay( If_Man_t * p, If_Cut_t * pCut );
extern void If_CutPropagateRequired( If_Man_t * p, If_Cut_t * pCut, float Required );
/*=== ifMan.c ==========================================================*/
/*=== ifMan.c =============================================================*/
extern If_Man_t * If_ManStart( If_Par_t * pPars );
extern void If_ManStop( If_Man_t * p );
extern If_Obj_t * If_ManCreatePi( If_Man_t * p );
extern If_Obj_t * If_ManCreatePo( If_Man_t * p, If_Obj_t * pDriver, int fCompl0 );
extern If_Obj_t * If_ManCreateCi( If_Man_t * p );
extern If_Obj_t * If_ManCreateCo( If_Man_t * p, If_Obj_t * pDriver, int fCompl0 );
extern If_Obj_t * If_ManCreateAnd( If_Man_t * p, If_Obj_t * pFan0, int fCompl0, If_Obj_t * pFan1, int fCompl1 );
extern void If_ManCreateChoice( If_Man_t * p, If_Obj_t * pRepr );
/*=== ifMap.c ==========================================================*/
extern void If_ObjPerformMapping( If_Man_t * p, If_Obj_t * pObj, int Mode );
/*=== ifMap.c =============================================================*/
extern void If_ObjPerformMappingAnd( If_Man_t * p, If_Obj_t * pObj, int Mode );
extern void If_ObjPerformMappingChoice( If_Man_t * p, If_Obj_t * pObj, int Mode );
extern int If_ManPerformMappingRound( If_Man_t * p, int nCutsUsed, int Mode, int fRequired, char * pLabel );
/*=== ifPrepro.c ==========================================================*/
extern void If_ManPerformMappingPreprocess( If_Man_t * p );
/*=== ifReduce.c ==========================================================*/
extern void If_ManImproveMapping( If_Man_t * p );
/*=== ifSeq.c ==========================================================*/
/*=== ifSeq.c =============================================================*/
extern int If_ManPerformMappingSeq( If_Man_t * p );
/*=== ifTruth.c ==========================================================*/
/*=== ifTime.c ============================================================*/
extern float If_CutDelay( If_Man_t * p, If_Cut_t * pCut );
extern void If_CutPropagateRequired( If_Man_t * p, If_Cut_t * pCut, float Required );
/*=== ifTruth.c ===========================================================*/
extern void If_CutComputeTruth( If_Man_t * p, If_Cut_t * pCut, If_Cut_t * pCut0, If_Cut_t * pCut1, int fCompl0, int fCompl1 );
/*=== ifUtil.c ==========================================================*/
extern float If_ManDelayMax( If_Man_t * p );
/*=== ifUtil.c ============================================================*/
extern void If_ManCleanNodeCopy( If_Man_t * p );
extern void If_ManCleanCutData( If_Man_t * p );
extern void If_ManCleanMarkV( If_Man_t * p );
extern float If_ManDelayMax( If_Man_t * p, int fSeq );
extern void If_ManComputeRequired( If_Man_t * p, int fFirstTime );
extern float If_ManScanMapping( If_Man_t * p );
extern float If_ManScanMappingSeq( If_Man_t * p );
#ifdef __cplusplus
}

18
src/map/if/ifCore.c
View File

@ -45,13 +45,25 @@ int If_ManPerformMapping( If_Man_t * p )
int nItersFlow = 1;
int nItersArea = 2;
int clkTotal = clock();
int i;
int RetValue, i;
// try sequential mapping
if ( p->pPars->fSeqMap )
{
RetValue = If_ManPerformMappingSeq( p );
if ( p->pPars->fVerbose )
{
PRT( "Total time", clock() - clkTotal );
}
return RetValue;
}
// set arrival times and trivial cuts at const 1 and PIs
If_ManConst1(p)->Cuts[0].Delay = 0.0;
If_ManForEachPi( p, pObj, i )
If_ManForEachCi( p, pObj, i )
pObj->Cuts[0].Delay = p->pPars->pTimesArr[i];
// set the fanout estimates of the PIs
If_ManForEachPi( p, pObj, i )
If_ManForEachCi( p, pObj, i )
pObj->EstRefs = (float)1.0;
// delay oriented mapping
if ( p->pPars->fPreprocess && !p->pPars->fArea && p->pPars->nCutsMax >= 4 )

33
src/map/if/ifCut.c
View File

@ -423,13 +423,15 @@ float If_CutFlow( If_Man_t * p, If_Cut_t * pCut )
If_Obj_t * pLeaf;
float Flow;
int i;
assert( pCut->nLeaves > 1 );
assert( p->pPars->fSeqMap || pCut->nLeaves > 1 );
Flow = If_CutLutArea(p, pCut);
If_CutForEachLeaf( p, pCut, pLeaf, i )
{
if ( pLeaf->nRefs == 0 )
Flow += If_ObjCutBest(pLeaf)->Area;
else
else if ( p->pPars->fSeqMap ) // seq
Flow += If_ObjCutBest(pLeaf)->Area / pLeaf->nRefs;
else
{
assert( pLeaf->EstRefs > p->fEpsilon );
Flow += If_ObjCutBest(pLeaf)->Area / pLeaf->EstRefs;
@ -453,7 +455,7 @@ float If_CutAverageRefs( If_Man_t * p, If_Cut_t * pCut )
{
If_Obj_t * pLeaf;
int nRefsTotal, i;
assert( pCut->nLeaves > 1 );
assert( p->pPars->fSeqMap || pCut->nLeaves > 1 );
nRefsTotal = 0;
If_CutForEachLeaf( p, pCut, pLeaf, i )
nRefsTotal += pLeaf->nRefs;
@ -569,7 +571,7 @@ void If_CutPrintTiming( If_Man_t * p, If_Cut_t * pCut )
float If_CutAreaDerefed( If_Man_t * p, If_Cut_t * pCut, int nLevels )
{
float aResult, aResult2;
assert( pCut->nLeaves > 1 );
assert( p->pPars->fSeqMap || pCut->nLeaves > 1 );
aResult2 = If_CutRef( p, pCut, nLevels );
aResult = If_CutDeref( p, pCut, nLevels );
assert( aResult == aResult2 );
@ -590,13 +592,34 @@ float If_CutAreaDerefed( If_Man_t * p, If_Cut_t * pCut, int nLevels )
float If_CutAreaRefed( If_Man_t * p, If_Cut_t * pCut, int nLevels )
{
float aResult, aResult2;
assert( pCut->nLeaves > 1 );
assert( p->pPars->fSeqMap || pCut->nLeaves > 1 );
aResult2 = If_CutDeref( p, pCut, nLevels );
aResult = If_CutRef( p, pCut, nLevels );
assert( aResult == aResult2 );
return aResult;
}
/**Function*************************************************************
Synopsis [Moves the cut over the latch.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void If_CutLift( If_Cut_t * pCut )
{
unsigned i;
for ( i = 0; i < pCut->nLeaves; i++ )
{
assert( (pCut->pLeaves[i] & 255) < 255 );
pCut->pLeaves[i]++;
}
}
/**Function*************************************************************
Synopsis [Computes area of the first level.]

28
src/map/if/ifMan.c
View File

@ -51,8 +51,8 @@ If_Man_t * If_ManStart( If_Par_t * pPars )
p->pPars = pPars;
p->fEpsilon = (float)0.001;
// allocate arrays for nodes
p->vPis = Vec_PtrAlloc( 100 );
p->vPos = Vec_PtrAlloc( 100 );
p->vCis = Vec_PtrAlloc( 100 );
p->vCos = Vec_PtrAlloc( 100 );
p->vObjs = Vec_PtrAlloc( 100 );
p->vMapped = Vec_PtrAlloc( 100 );
p->vTemp = Vec_PtrAlloc( 100 );
@ -96,11 +96,13 @@ void If_ManStop( If_Man_t * p )
{
If_Cut_t * pTemp;
int i;
Vec_PtrFree( p->vPis );
Vec_PtrFree( p->vPos );
Vec_PtrFree( p->vCis );
Vec_PtrFree( p->vCos );
Vec_PtrFree( p->vObjs );
Vec_PtrFree( p->vMapped );
Vec_PtrFree( p->vTemp );
if ( p->vLatchOrder ) Vec_PtrFree( p->vLatchOrder );
if ( p->vLags ) Vec_IntFree( p->vLags );
Mem_FixedStop( p->pMem, 0 );
// free pars memory
if ( p->pPars->pTimesArr )
@ -129,13 +131,13 @@ void If_ManStop( If_Man_t * p )
SeeAlso []
***********************************************************************/
If_Obj_t * If_ManCreatePi( If_Man_t * p )
If_Obj_t * If_ManCreateCi( If_Man_t * p )
{
If_Obj_t * pObj;
pObj = If_ManSetupObj( p );
pObj->Type = IF_PI;
Vec_PtrPush( p->vPis, pObj );
p->nObjs[IF_PI]++;
pObj->Type = IF_CI;
Vec_PtrPush( p->vCis, pObj );
p->nObjs[IF_CI]++;
return pObj;
}
@ -150,15 +152,15 @@ If_Obj_t * If_ManCreatePi( If_Man_t * p )
SeeAlso []
***********************************************************************/
If_Obj_t * If_ManCreatePo( If_Man_t * p, If_Obj_t * pDriver, int fCompl0 )
If_Obj_t * If_ManCreateCo( If_Man_t * p, If_Obj_t * pDriver, int fCompl0 )
{
If_Obj_t * pObj;
pObj = If_ManSetupObj( p );
pObj->Type = IF_PO;
pObj->Type = IF_CO;
pObj->fCompl0 = fCompl0;
Vec_PtrPush( p->vPos, pObj );
Vec_PtrPush( p->vCos, pObj );
pObj->pFanin0 = pDriver; pDriver->nRefs++;
p->nObjs[IF_PO]++;
p->nObjs[IF_CO]++;
return pObj;
}
@ -251,7 +253,7 @@ If_Obj_t * If_ManSetupObj( If_Man_t * p )
// assign elementary cut
pCut = pObj->Cuts;
pCut->nLeaves = 1;
pCut->pLeaves[0] = p->pPars->fSeq? (pObj->Id << 8) : pObj->Id;
pCut->pLeaves[0] = p->pPars->fLiftLeaves? (pObj->Id << 8) : pObj->Id;
pCut->uSign = If_ObjCutSign( pCut->pLeaves[0] );
// set the number of cuts
pObj->nCuts = 1;

58
src/map/if/ifMap.c
View File

@ -69,27 +69,31 @@ static inline int If_WordCountOnes( unsigned uWord )
SeeAlso []
***********************************************************************/
void If_ObjPerformMapping( If_Man_t * p, If_Obj_t * pObj, int Mode )
void If_ObjPerformMappingAnd( If_Man_t * p, If_Obj_t * pObj, int Mode )
{
If_Cut_t * pCut0, * pCut1, * pCut;
int i, k, iCut;
assert( !If_ObjIsAnd(pObj->pFanin0) || pObj->pFanin0->nCuts > 1 );
assert( !If_ObjIsAnd(pObj->pFanin1) || pObj->pFanin1->nCuts > 1 );
assert( p->pPars->fSeqMap || !If_ObjIsAnd(pObj->pFanin0) || pObj->pFanin0->nCuts > 1 );
assert( p->pPars->fSeqMap || !If_ObjIsAnd(pObj->pFanin1) || pObj->pFanin1->nCuts > 1 );
// prepare
if ( Mode == 0 )
pObj->EstRefs = (float)pObj->nRefs;
else if ( Mode == 1 )
pObj->EstRefs = (float)((2.0 * pObj->EstRefs + pObj->nRefs) / 3.0);
else if ( Mode == 2 && pObj->nRefs > 0 )
if ( !p->pPars->fSeqMap )
{
if ( Mode == 0 )
pObj->EstRefs = (float)pObj->nRefs;
else if ( Mode == 1 )
pObj->EstRefs = (float)((2.0 * pObj->EstRefs + pObj->nRefs) / 3.0);
}
if ( Mode && pObj->nRefs > 0 )
If_CutDeref( p, If_ObjCutBest(pObj), 100 );
// recompute the parameters of the best cut
// save the best cut as one of the candidate cuts
p->nCuts = 0;
p->nCutsMerged++;
if ( Mode )
{
// recompute the parameters of the best cut
pCut = If_ObjCutBest(pObj);
pCut->Delay = If_CutDelay( p, pCut );
assert( pCut->Delay <= pObj->Required + p->fEpsilon );
@ -114,12 +118,12 @@ void If_ObjPerformMapping( If_Man_t * p, If_Obj_t * pObj, int Mode )
continue;
// check if this cut is contained in any of the available cuts
pCut->uSign = pCut0->uSign | pCut1->uSign;
pCut->fCompl = 0;
// if ( p->pPars->pFuncCost == NULL && If_CutFilter( p, pCut ) ) // do not filter functionality cuts
if ( If_CutFilter( p, pCut ) )
continue;
// the cuts have been successfully merged
// compute the truth table
pCut->fCompl = 0;
if ( p->pPars->fTruth )
If_CutComputeTruth( p, pCut, pCut0, pCut1, pObj->fCompl0, pObj->fCompl1 );
// compute the application-specific cost and depth
@ -149,16 +153,14 @@ void If_ObjPerformMapping( If_Man_t * p, If_Obj_t * pObj, int Mode )
If_ManSortCuts( p, Mode );
// decide how many cuts to use
pObj->nCuts = IF_MIN( p->nCuts + 1, p->nCutsUsed );
//printf( "%d(%d) ", p->nCuts, pObj->nCuts );
// take the first
If_ObjForEachCutStart( pObj, pCut, i, 1 )
If_CutCopy( pCut, p->ppCuts[i-1] );
assert( If_ObjCutBest(pObj)->nLeaves > 1 );
assert( p->pPars->fSeqMap || If_ObjCutBest(pObj)->nLeaves > 1 );
// ref the selected cut
if ( Mode == 2 && pObj->nRefs > 0 )
if ( Mode && pObj->nRefs > 0 )
If_CutRef( p, If_ObjCutBest(pObj), 100 );
// find the largest cut
if ( p->nCutsMax < pObj->nCuts )
p->nCutsMax = pObj->nCuts;
}
/**Function*************************************************************
@ -172,14 +174,14 @@ void If_ObjPerformMapping( If_Man_t * p, If_Obj_t * pObj, int Mode )
SeeAlso []
***********************************************************************/
void If_ObjMergeChoice( If_Man_t * p, If_Obj_t * pObj, int Mode )
void If_ObjPerformMappingChoice( If_Man_t * p, If_Obj_t * pObj, int Mode )
{
If_Obj_t * pTemp;
If_Cut_t * pCutTemp, * pCut;
int i, iCut;
assert( pObj->pEquiv != NULL );
// prepare
if ( Mode == 2 && pObj->nRefs > 0 )
if ( Mode && pObj->nRefs > 0 )
If_CutDeref( p, If_ObjCutBest(pObj), 100 );
// prepare room for the next cut
p->nCuts = 0;
@ -227,13 +229,10 @@ void If_ObjMergeChoice( If_Man_t * p, If_Obj_t * pObj, int Mode )
// take the first
If_ObjForEachCutStart( pObj, pCut, i, 1 )
If_CutCopy( pCut, p->ppCuts[i-1] );
assert( If_ObjCutBest(pObj)->nLeaves > 1 );
assert( p->pPars->fSeqMap || If_ObjCutBest(pObj)->nLeaves > 1 );
// ref the selected cut
if ( Mode == 2 && pObj->nRefs > 0 )
if ( Mode && pObj->nRefs > 0 )
If_CutRef( p, If_ObjCutBest(pObj), 100 );
// find the largest cut
if ( p->nCutsMax < pObj->nCuts )
p->nCutsMax = pObj->nCuts;
}
/**Function*************************************************************
@ -249,25 +248,23 @@ void If_ObjMergeChoice( If_Man_t * p, If_Obj_t * pObj, int Mode )
***********************************************************************/
int If_ManPerformMappingRound( If_Man_t * p, int nCutsUsed, int Mode, int fRequired, char * pLabel )
{
ProgressBar * pProgress;
// ProgressBar * pProgress;
If_Obj_t * pObj;
int i, clk = clock();
assert( Mode >= 0 && Mode <= 2 );
// set the cut number
p->nCutsUsed = nCutsUsed;
p->nCutsMerged = 0;
p->nCutsSaved = 0;
p->nCutsMax = 0;
// map the internal nodes
pProgress = Extra_ProgressBarStart( stdout, If_ManObjNum(p) );
// pProgress = Extra_ProgressBarStart( stdout, If_ManObjNum(p) );
If_ManForEachNode( p, pObj, i )
{
Extra_ProgressBarUpdate( pProgress, i, pLabel );
If_ObjPerformMapping( p, pObj, Mode );
// Extra_ProgressBarUpdate( pProgress, i, pLabel );
If_ObjPerformMappingAnd( p, pObj, Mode );
if ( pObj->fRepr )
If_ObjMergeChoice( p, pObj, Mode );
If_ObjPerformMappingChoice( p, pObj, Mode );
}
Extra_ProgressBarStop( pProgress );
// Extra_ProgressBarStop( pProgress );
// compute required times and stats
if ( fRequired )
{
@ -278,7 +275,6 @@ int If_ManPerformMappingRound( If_Man_t * p, int nCutsUsed, int Mode, int fRequi
printf( "%c: Del = %6.2f. Area = %8.2f. Cuts = %8d. Lim = %2d. Ave = %5.2f. ",
Symb, p->RequiredGlo, p->AreaGlo, p->nCutsMerged, p->nCutsUsed, 1.0 * p->nCutsMerged / If_ManAndNum(p) );
PRT( "T", clock() - clk );
// printf( "Saved cuts = %d.\n", p->nCutsSaved );
// printf( "Max number of cuts = %d. Average number of cuts = %5.2f.\n",
// p->nCutsMax, 1.0 * p->nCutsMerged / If_ManAndNum(p) );
}

6
src/map/if/ifPrepro.c
View File

@ -52,7 +52,7 @@ void If_ManPerformMappingPreprocess( If_Man_t * p )
p->pPars->fArea = 1;
If_ManPerformMappingRound( p, p->pPars->nCutsMax, 0, 0, "Start delay" );
p->pPars->fArea = 0;
delayArea = If_ManDelayMax( p );
delayArea = If_ManDelayMax( p, 0 );
if ( p->pPars->DelayTarget != -1 && delayArea < p->pPars->DelayTarget - p->fEpsilon )
delayArea = p->pPars->DelayTarget;
If_ManPerformMappingMoveBestCut( p, p->pPars->nCutsMax - 1, 1 );
@ -61,14 +61,14 @@ void If_ManPerformMappingPreprocess( If_Man_t * p )
p->pPars->fFancy = 1;
If_ManPerformMappingRound( p, p->pPars->nCutsMax - 1, 0, 0, "Start delay-2" );
p->pPars->fFancy = 0;
delayDelay = If_ManDelayMax( p );
delayDelay = If_ManDelayMax( p, 0 );
if ( p->pPars->DelayTarget != -1 && delayDelay < p->pPars->DelayTarget - p->fEpsilon )
delayDelay = p->pPars->DelayTarget;
If_ManPerformMappingMoveBestCut( p, p->pPars->nCutsMax - 2, 1 );
// perform min-delay mapping
If_ManPerformMappingRound( p, p->pPars->nCutsMax - 2, 0, 0, "Start flow" );
delayPure = If_ManDelayMax( p );
delayPure = If_ManDelayMax( p, 0 );
if ( p->pPars->DelayTarget != -1 && delayPure < p->pPars->DelayTarget - p->fEpsilon )
delayPure = p->pPars->DelayTarget;

10
src/map/if/ifReduce.c
View File

@ -361,7 +361,7 @@ int If_ManImproveNodeFaninCompact0( If_Man_t * p, If_Obj_t * pObj, int nLimit, V
int i;
Vec_PtrForEachEntry( vFront, pFanin, i )
{
if ( If_ObjIsPi(pFanin) )
if ( If_ObjIsCi(pFanin) )
continue;
if ( If_ManImproveNodeWillGrow(p, pFanin) )
continue;
@ -391,7 +391,7 @@ int If_ManImproveNodeFaninCompact1( If_Man_t * p, If_Obj_t * pObj, int nLimit, V
int i;
Vec_PtrForEachEntry( vFront, pFanin, i )
{
if ( If_ObjIsPi(pFanin) )
if ( If_ObjIsCi(pFanin) )
continue;
if ( If_ManImproveNodeFaninCost(p, pFanin) < 0 )
{
@ -419,7 +419,7 @@ int If_ManImproveNodeFaninCompact2( If_Man_t * p, If_Obj_t * pObj, int nLimit, V
int i;
Vec_PtrForEachEntry( vFront, pFanin, i )
{
if ( If_ObjIsPi(pFanin) )
if ( If_ObjIsCi(pFanin) )
continue;
if ( If_ManImproveNodeFaninCost(p, pFanin) <= 0 )
{
@ -498,8 +498,8 @@ void If_ManImproveNodeReduce( If_Man_t * p, If_Obj_t * pObj, int nLimit )
pFanin1 = If_ObjFanin1(pObj);
// get the cuts
pCut = If_ObjCutBest(pObj);
pCut0 = If_ObjIsPi(pFanin0) ? If_ObjCutTriv(pFanin0) : If_ObjCutBest(pFanin0);
pCut1 = If_ObjIsPi(pFanin1) ? If_ObjCutTriv(pFanin1) : If_ObjCutBest(pFanin1);
pCut0 = If_ObjIsCi(pFanin0) ? If_ObjCutTriv(pFanin0) : If_ObjCutBest(pFanin0);
pCut1 = If_ObjIsCi(pFanin1) ? If_ObjCutTriv(pFanin1) : If_ObjCutBest(pFanin1);
assert( pCut->Delay <= pObj->Required + p->fEpsilon );
// deref the cut if the node is refed

431
src/map/if/ifSeq.c
View File

@ -24,9 +24,11 @@
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
static void If_ObjPerformMappingLI( If_Man_t * p, If_Obj_t * pLatch );
static void If_ObjPerformMappingLO( If_Man_t * p, If_Obj_t * pLatch, If_Obj_t * pObj );
static int If_ManMappingSeqConverged( If_Man_t * p );
static int If_ManBinarySearchPeriod( If_Man_t * p, int Mode );
static int If_ManBinarySearch_rec( If_Man_t * p, int Mode, int FiMin, int FiMax );
static int If_ManPerformMappingRoundSeq( If_Man_t * p, int Mode, int nIter, char * pLabel );
static int If_ManPrepareMappingSeq( If_Man_t * p );
static int If_ObjPerformMappingLatch( If_Man_t * p, If_Obj_t * pObj );
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
@ -45,46 +47,327 @@ static int If_ManMappingSeqConverged( If_Man_t * p );
***********************************************************************/
int If_ManPerformMappingSeq( If_Man_t * p )
{
If_Obj_t * pObj, * pLatch;
int i, clkTotal = clock();
// set the number of cuts used
p->nCutsUsed = p->pPars->nCutsMax;
// set arrival times and trivial cuts at const 1 and PIs
If_ManConst1(p)->Cuts[0].Delay = 0.0;
If_ManForEachPi( p, pObj, i )
pObj->Cuts[0].Delay = p->pPars->pTimesArr[i];
// set the fanout estimates of the PIs
If_ManForEachPi( p, pObj, i )
pObj->EstRefs = (float)1.0;
// delay oriented mapping
p->pPars->fFancy = 1;
If_ManPerformMappingRound( p, p->pPars->nCutsMax, 0, 0, NULL );
p->pPars->fFancy = 0;
int PeriodBest, Mode = 0;
// perform iterations over the circuit
while ( !If_ManMappingSeqConverged( p ) )
// collect nodes in the sequential order
If_ManPrepareMappingSeq( p );
// perform combinational mapping to get the upper bound on the clock period
If_ManPerformMappingRound( p, 2, 0, 0, NULL );
p->RequiredGlo = If_ManDelayMax( p, 0 );
// set parameters
p->nCutsUsed = p->pPars->nCutsMax;
p->nAttempts = 0;
p->nMaxIters = 50;
p->Period = (int)p->RequiredGlo;
// make sure the clock period words
if ( !If_ManBinarySearchPeriod( p, Mode ) )
{
// assign cuts to latches
If_ManForEachLatch( p, pLatch, i )
If_ObjPerformMappingLI( p, pLatch );
// assign cuts to primary inputs
If_ManForEachLatch( p, pLatch, i )
If_ObjPerformMappingLO( p, pLatch, If_ManPi(p, If_ManPiNum(p) - If_ManPoNum(p) + i) );
// map the nodes
If_ManForEachNode( p, pObj, i )
If_ObjPerformMapping( p, pObj, 0 );
printf( "If_ManPerformMappingSeq(): The upper bound on the clock period cannot be computed.\n" );
return 0;
}
// perform binary search
PeriodBest = If_ManBinarySearch_rec( p, Mode, 0, p->Period );
// recompute the best l-values
if ( p->Period != PeriodBest )
{
p->Period = PeriodBest;
if ( !If_ManBinarySearchPeriod( p, Mode ) )
{
printf( "If_ManPerformMappingSeq(): The final clock period cannot be confirmed.\n" );
return 0;
}
}
/*
// fix the problem with non-converged delays
If_ManForEachNode( p, pObj, i )
if ( pObj->LValue < -ABC_INFINITY/2 )
pObj->LValue = (float)0.0;
// write the retiming lags
p->vLags = Vec_IntStart( If_ManObjNum(p) + 1 );
If_ManForEachNode( p, pObj, i )
Vec_IntWriteEntry( vLags, i, Abc_NodeComputeLag(pObj->LValue, p->Period) );
*/
/*
// print the statistic into a file
{
FILE * pTable;
pTable = fopen( "a/seqmap__stats.txt", "a+" );
fprintf( pTable, "%d ", p->Period );
fprintf( pTable, "\n" );
fclose( pTable );
}
*/
// print the result
if ( p->pPars->fLiftLeaves )
{
// if ( p->pPars->fVerbose )
printf( "The best clock period is %3d. (Currently, network is not modified, so mapping will fail.)\n", p->Period );
return 0;
}
// if ( p->pPars->fVerbose )
printf( "The best clock period is %3d.\n", p->Period );
return 1;
}
/**Function*************************************************************
Synopsis [Performs binary search for the optimal clock period.]
Description [Assumes that FiMin is infeasible while FiMax is feasible.]
SideEffects []
SeeAlso []
***********************************************************************/
int If_ManBinarySearch_rec( If_Man_t * p, int Mode, int FiMin, int FiMax )
{
assert( FiMin < FiMax );
if ( FiMin + 1 == FiMax )
return FiMax;
// compute the median
p->Period = FiMin + (FiMax - FiMin)/2;
if ( If_ManBinarySearchPeriod( p, Mode ) )
return If_ManBinarySearch_rec( p, Mode, FiMin, p->Period ); // Median is feasible
else
return If_ManBinarySearch_rec( p, Mode, p->Period, FiMax ); // Median is infeasible
}
/**Function*************************************************************
Synopsis [Returns 1 if retiming with this clock period is feasible.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int If_ManBinarySearchPeriod( If_Man_t * p, int Mode )
{
If_Obj_t * pObj;
int i, c, fConverged;
int fResetRefs = 0;
p->nAttempts++;
// set l-values of all nodes to be minus infinity, except PIs and constants
If_ManForEachObj( p, pObj, i )
{
pObj->nCuts = 1;
If_ObjSetLValue( pObj, -IF_FLOAT_LARGE );
if ( fResetRefs )
pObj->nRefs = 0;
}
If_ObjSetLValue( If_ManConst1(p), (float)0.0 );
If_ManForEachPi( p, pObj, i )
If_ObjSetLValue( pObj, (float)0.0 );
// reset references to their original state
if ( fResetRefs )
{
If_ManForEachObj( p, pObj, i )
{
if ( If_ObjIsCo(pObj) )
continue;
if ( pObj->pFanin0 ) pObj->pFanin0->nRefs++;
if ( pObj->pFanin1 ) pObj->pFanin1->nRefs++;
}
}
// update all values iteratively
fConverged = 0;
for ( c = 1; c <= p->nMaxIters; c++ )
{
if ( !If_ManPerformMappingRoundSeq( p, Mode, c, NULL ) )
{
fConverged = 1;
break;
}
p->RequiredGlo = If_ManDelayMax( p, 1 );
if ( p->RequiredGlo > p->Period + p->fEpsilon )
break;
}
// report the results
if ( p->pPars->fVerbose )
{
PRT( "Total time", clock() - clkTotal );
p->AreaGlo = p->pPars->fLiftLeaves? If_ManScanMappingSeq(p) : If_ManScanMapping(p);
printf( "Attempt = %2d. Iters = %3d. Area = %10.2f. Fi = %6.2f. ", p->nAttempts, c, p->AreaGlo, (float)p->Period );
if ( fConverged )
printf( " Feasible" );
else if ( c > p->nMaxIters )
printf( "Infeasible (timeout)" );
else
printf( "Infeasible" );
printf( "\n" );
}
return fConverged;
}
/**Function*************************************************************
Synopsis [Performs one pass of l-value computation over all nodes.]
Description [Experimentally it was found that checking POs changes
is not enough to detect the convergence of l-values in the network.]
SideEffects []
SeeAlso []
***********************************************************************/
int If_ManPerformMappingRoundSeq( If_Man_t * p, int Mode, int nIter, char * pLabel )
{
ProgressBar * pProgress;
If_Obj_t * pObj;
int i, clk = clock();
int fVeryVerbose = 0;
int fChange = 0;
assert( Mode >= 0 && Mode <= 2 );
if ( !p->pPars->fVerbose )
pProgress = Extra_ProgressBarStart( stdout, If_ManObjNum(p) );
// map the internal nodes
p->nCutsMerged = 0;
If_ManForEachNode( p, pObj, i )
{
if ( !p->pPars->fVerbose )
Extra_ProgressBarUpdate( pProgress, i, pLabel );
// consider the camse of an AND gate
assert( If_ObjIsAnd(pObj) );
If_ObjPerformMappingAnd( p, pObj, Mode );
if ( pObj->fRepr )
If_ObjPerformMappingChoice( p, pObj, Mode );
// check if updating happens
if ( If_ObjLValue(pObj) < If_ObjCutBest(pObj)->Delay - p->fEpsilon )
{
If_ObjSetLValue( pObj, If_ObjCutBest(pObj)->Delay );
fChange = 1;
}
//if ( If_ObjLValue(pObj) > -1000.0 )
//printf( "Node %d %.2f ", pObj->Id, If_ObjLValue(pObj) );
}
if ( !p->pPars->fVerbose )
Extra_ProgressBarStop( pProgress );
// propagate arrival times from the registers
Vec_PtrForEachEntry( p->vLatchOrder, pObj, i )
fChange |= If_ObjPerformMappingLatch( p, pObj );
//printf( "\n\n" );
// compute area and delay
if ( fVeryVerbose )
{
p->RequiredGlo = If_ManDelayMax( p, 1 );
p->AreaGlo = p->pPars->fLiftLeaves? If_ManScanMappingSeq(p) : If_ManScanMapping(p);
printf( "S%d: Fi = %6.2f. Del = %6.2f. Area = %8.2f. Cuts = %8d. Lim = %2d. Ave = %5.2f. ",
nIter, (float)p->Period, p->RequiredGlo, p->AreaGlo, p->nCutsMerged, p->nCutsUsed, 1.0 * p->nCutsMerged / If_ManAndNum(p) );
PRT( "T", clock() - clk );
}
return fChange;
}
/**Function*************************************************************
Synopsis [Collects latches in the topological order.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void If_ManCollectLatches_rec( If_Obj_t * pObj, Vec_Ptr_t * vLatches )
{
if ( !If_ObjIsLatch(pObj) )
return;
if ( pObj->fMark )
return;
pObj->fMark = 1;
If_ManCollectLatches_rec( pObj->pFanin0, vLatches );
Vec_PtrPush( vLatches, pObj );
}
/**Function*************************************************************
Synopsis [Collects latches in the topological order.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Ptr_t * If_ManCollectLatches( If_Man_t * p )
{
Vec_Ptr_t * vLatches;
If_Obj_t * pObj;
int i;
// collect latches
vLatches = Vec_PtrAlloc( p->pPars->nLatches );
Vec_PtrForEachEntryStart( p->vCis, pObj, i, If_ManCiNum(p) - p->pPars->nLatches )
If_ManCollectLatches_rec( pObj, vLatches );
// clean marks
Vec_PtrForEachEntry( vLatches, pObj, i )
pObj->fMark = 0;
assert( Vec_PtrSize(vLatches) == p->pPars->nLatches );
return vLatches;
}
/**Function*************************************************************
Synopsis [Prepares for sequential mapping by linking the latches.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int If_ManPrepareMappingSeq( If_Man_t * p )
{
If_Obj_t * pObj, * pObjLi, * pObjLo, * pTemp;
If_Cut_t * pCut;
int i;
// link the latch outputs (PIs) directly to the drivers of latch inputs (POs)
for ( i = 0; i < p->pPars->nLatches; i++ )
{
pObjLo = If_ManCi( p, If_ManCiNum(p) - p->pPars->nLatches + i );
pObjLi = If_ManCo( p, If_ManCoNum(p) - p->pPars->nLatches + i );
pObjLo->pFanin0 = If_ObjFanin0( pObjLi );
pObjLo->fCompl0 = If_ObjFaninC0( pObjLi );
// pObjLo->pFanin0 = pObjLi;
}
// collect latches
p->vLatchOrder = If_ManCollectLatches( p );
// propagate elementary cuts
if ( p->pPars->fLiftLeaves )
{
Vec_PtrForEachEntry( p->vLatchOrder, pObj, i )
{
pCut = If_ObjCutTriv(pObj);
If_CutCopy( pCut, If_ObjFanin0(pObj)->Cuts );
If_CutLift( pCut );
pCut->Delay -= p->Period;
pCut->fCompl ^= pObj->fCompl0;
pTemp = If_ManObj(p, pCut->pLeaves[0] >> 8);
assert( !If_ObjIsLatch(pTemp) );
}
}
return 1;
}
/**Function*************************************************************
Synopsis [Performs sequential mapping.]
Synopsis [Performs mapping of the latches.]
Description []
@ -93,76 +376,36 @@ int If_ManPerformMappingSeq( If_Man_t * p )
SeeAlso []
***********************************************************************/
void If_CutLift( If_Cut_t * pCut )
{
unsigned i;
for ( i = 0; i < pCut->nLeaves; i++ )
pCut->pLeaves[i] = ((pCut->pLeaves[i] >> 8) << 8) | ((pCut->pLeaves[i] & 255) + 1);
}
/**Function*************************************************************
Synopsis [Performs sequential mapping.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void If_ObjPerformMappingLI( If_Man_t * p, If_Obj_t * pLatch )
int If_ObjPerformMappingLatch( If_Man_t * p, If_Obj_t * pObj )
{
If_Obj_t * pFanin;
int c;
assert( If_ObjIsPo(pLatch) );
pFanin = If_ObjFanin0(pLatch);
for ( c = 0; c < pFanin->nCuts; c++ )
If_CutCopy( pLatch->Cuts + c, pFanin->Cuts + c );
}
/**Function*************************************************************
Synopsis [Performs sequential mapping.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void If_ObjPerformMappingLO( If_Man_t * p, If_Obj_t * pLatch, If_Obj_t * pObj )
{
If_Cut_t * pCut;
int c, Limit = IF_MIN( p->nCuts + 1, p->nCutsUsed );
assert( If_ObjIsPo(pLatch) );
for ( c = 1; c < Limit; c++ )
float LValueOld;
int i;
assert( If_ObjIsLatch(pObj) );
// save old l-value
LValueOld = If_ObjLValue(pObj);
pFanin = If_ObjFanin0(pObj);
assert( pFanin->nCuts > 0 );
if ( !p->pPars->fLiftLeaves )
{
pCut = pObj->Cuts + c;
If_CutCopy( pCut, pLatch->Cuts + c - 1 );
If_CutLift( pCut );
pCut->Delay -= p->Fi;
pObj->nCuts = 1;
If_ObjSetLValue( pObj, If_ObjLValue(pFanin) - p->Period );
}
else
{
pObj->nCuts = pFanin->nCuts;
If_ObjForEachCut( pObj, pCut, i )
{
If_CutCopy( pCut, pFanin->Cuts + i );
If_CutLift( pCut );
pCut->Delay -= p->Period;
pCut->fCompl ^= pObj->fCompl0;
}
}
return LValueOld != If_ObjLValue(pObj);
}
/**Function*************************************************************
Synopsis [Performs sequential mapping.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int If_ManMappingSeqConverged( If_Man_t * p )
{
return 0;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////

30
src/map/if/ifLib.c → src/map/if/ifTime.c
View File

@ -1,12 +1,12 @@
/**CFile****************************************************************
FileName [ifLib.c]
FileName [ifTime.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [FPGA mapping based on priority cuts.]
Synopsis [Computation of LUT paramters depending on the library.]
Synopsis [Computation of delay paramters depending on the library.]
Author [Alan Mishchenko]
@ -14,7 +14,7 @@
Date [Ver. 1.0. Started - November 21, 2006.]
Revision [$Id: ifLib.c,v 1.00 2006/11/21 00:00:00 alanmi Exp $]
Revision [$Id: ifTime.c,v 1.00 2006/11/21 00:00:00 alanmi Exp $]
***********************************************************************/
@ -48,11 +48,12 @@ float If_CutDelay( If_Man_t * p, If_Cut_t * pCut )
If_Obj_t * pLeaf;
float Delay, DelayCur;
float * pLutDelays;
int i;
assert( pCut->nLeaves > 1 );
int i, Shift;
assert( p->pPars->fSeqMap || pCut->nLeaves > 1 );
Delay = -IF_FLOAT_LARGE;
if ( p->pPars->pLutLib )
{
assert( !p->pPars->fLiftLeaves );
pLutDelays = p->pPars->pLutLib->pLutDelays[pCut->nLeaves];
if ( p->pPars->pLutLib->fVarPinDelays )
{
@ -77,6 +78,7 @@ float If_CutDelay( If_Man_t * p, If_Cut_t * pCut )
{
if ( pCut->fUser )
{
assert( !p->pPars->fLiftLeaves );
If_CutForEachLeaf( p, pCut, pLeaf, i )
{
DelayCur = If_ObjCutBest(pLeaf)->Delay + (float)pCut->pPerm[i];
@ -85,10 +87,21 @@ float If_CutDelay( If_Man_t * p, If_Cut_t * pCut )
}
else
{
If_CutForEachLeaf( p, pCut, pLeaf, i )
if ( p->pPars->fLiftLeaves )
{
DelayCur = If_ObjCutBest(pLeaf)->Delay;
Delay = IF_MAX( Delay, DelayCur );
If_CutForEachLeafSeq( p, pCut, pLeaf, Shift, i )
{
DelayCur = If_ObjCutBest(pLeaf)->Delay - Shift * p->Period;
Delay = IF_MAX( Delay, DelayCur );
}
}
else
{
If_CutForEachLeaf( p, pCut, pLeaf, i )
{
DelayCur = If_ObjCutBest(pLeaf)->Delay;
Delay = IF_MAX( Delay, DelayCur );
}
}
Delay += 1.0;
}
@ -115,6 +128,7 @@ void If_CutPropagateRequired( If_Man_t * p, If_Cut_t * pCut, float ObjRequired )
float * pLutDelays;
float Required;
int i;
assert( !p->pPars->fLiftLeaves );
// compute the pins
if ( p->pPars->pLutLib )
{

238
src/map/if/ifUtil.c
View File

@ -28,43 +28,6 @@
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Returns the max delay of the POs.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
float If_ManDelayMax( If_Man_t * p )
{
If_Obj_t * pObj;
float DelayBest;
int i;
if ( p->pPars->fLatchPaths && p->pPars->nLatches == 0 )
{
printf( "Delay optimization of latch path is not performed because there is no latches.\n" );
p->pPars->fLatchPaths = 0;
}
DelayBest = -IF_FLOAT_LARGE;
if ( p->pPars->fLatchPaths )
{
If_ManForEachLatch( p, pObj, i )
if ( DelayBest < If_ObjCutBest( If_ObjFanin0(pObj) )->Delay )
DelayBest = If_ObjCutBest( If_ObjFanin0(pObj) )->Delay;
}
else
{
If_ManForEachPo( p, pObj, i )
if ( DelayBest < If_ObjCutBest( If_ObjFanin0(pObj) )->Delay )
DelayBest = If_ObjCutBest( If_ObjFanin0(pObj) )->Delay;
}
return DelayBest;
}
/**Function*************************************************************
Synopsis [Sets all the node copy to NULL.]
@ -105,6 +68,119 @@ void If_ManCleanCutData( If_Man_t * p )
If_CutSetData( pCut, NULL );
}
/**Function*************************************************************
Synopsis [Sets all visited marks to 0.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void If_ManCleanMarkV( If_Man_t * p )
{
If_Obj_t * pObj;
int i;
If_ManForEachObj( p, pObj, i )
pObj->fVisit = 0;
}
/**Function*************************************************************
Synopsis [Returns the max delay of the POs.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
float If_ManDelayMax( If_Man_t * p, int fSeq )
{
If_Obj_t * pObj;
float DelayBest;
int i;
if ( p->pPars->fLatchPaths && p->pPars->nLatches == 0 )
{
printf( "Delay optimization of latch path is not performed because there is no latches.\n" );
p->pPars->fLatchPaths = 0;
}
DelayBest = -IF_FLOAT_LARGE;
if ( fSeq )
{
assert( p->pPars->nLatches > 0 );
If_ManForEachPo( p, pObj, i )
if ( DelayBest < If_ObjCutBest( If_ObjFanin0(pObj) )->Delay )
DelayBest = If_ObjCutBest( If_ObjFanin0(pObj) )->Delay;
}
else if ( p->pPars->fLatchPaths )
{
If_ManForEachLatch( p, pObj, i )
if ( DelayBest < If_ObjCutBest( If_ObjFanin0(pObj) )->Delay )
DelayBest = If_ObjCutBest( If_ObjFanin0(pObj) )->Delay;
}
else
{
If_ManForEachCo( p, pObj, i )
if ( DelayBest < If_ObjCutBest( If_ObjFanin0(pObj) )->Delay )
DelayBest = If_ObjCutBest( If_ObjFanin0(pObj) )->Delay;
}
return DelayBest;
}
/**Function*************************************************************
Synopsis [Computes the required times of all nodes.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void If_ManComputeRequired( If_Man_t * p, int fFirstTime )
{
If_Obj_t * pObj;
int i;
// compute area, clean required times, collect nodes used in the mapping
p->AreaGlo = If_ManScanMapping( p );
// get the global required times
p->RequiredGlo = If_ManDelayMax( p, 0 );
// update the required times according to the target
if ( p->pPars->DelayTarget != -1 )
{
if ( p->RequiredGlo > p->pPars->DelayTarget + p->fEpsilon )
{
if ( fFirstTime )
printf( "Cannot meet the target required times (%4.2f). Mapping continues anyway.\n", p->pPars->DelayTarget );
}
else if ( p->RequiredGlo < p->pPars->DelayTarget - p->fEpsilon )
{
if ( fFirstTime )
printf( "Relaxing the required times from (%4.2f) to the target (%4.2f).\n", p->RequiredGlo, p->pPars->DelayTarget );
p->RequiredGlo = p->pPars->DelayTarget;
}
}
// set the required times for the POs
if ( p->pPars->fLatchPaths )
{
If_ManForEachLatch( p, pObj, i )
If_ObjFanin0(pObj)->Required = p->RequiredGlo;
}
else
{
If_ManForEachCo( p, pObj, i )
If_ObjFanin0(pObj)->Required = p->RequiredGlo;
}
// go through the nodes in the reverse topological order
Vec_PtrForEachEntry( p->vMapped, pObj, i )
If_CutPropagateRequired( p, If_ObjCutBest(pObj), pObj->Required );
}
/**Function*************************************************************
Synopsis [Computes area, references, and nodes used in the mapping.]
@ -122,7 +198,7 @@ float If_ManScanMapping_rec( If_Man_t * p, If_Obj_t * pObj, If_Obj_t ** ppStore
If_Cut_t * pCutBest;
float aArea;
int i;
if ( pObj->nRefs++ || If_ObjIsPi(pObj) || If_ObjIsConst1(pObj) )
if ( pObj->nRefs++ || If_ObjIsCi(pObj) || If_ObjIsConst1(pObj) )
return 0.0;
// store the node in the structure by level
assert( If_ObjIsAnd(pObj) );
@ -153,6 +229,7 @@ float If_ManScanMapping( If_Man_t * p )
If_Obj_t * pObj, ** ppStore;
float aArea;
int i;
assert( !p->pPars->fLiftLeaves );
// clean all references
If_ManForEachObj( p, pObj, i )
{
@ -164,7 +241,7 @@ float If_ManScanMapping( If_Man_t * p )
memset( ppStore, 0, sizeof(If_Obj_t *) * (p->nLevelMax + 1) );
// collect nodes reachable from POs in the DFS order through the best cuts
aArea = 0;
If_ManForEachPo( p, pObj, i )
If_ManForEachCo( p, pObj, i )
aArea += If_ManScanMapping_rec( p, If_ObjFanin0(pObj), ppStore );
// reconnect the nodes in reverse topological order
Vec_PtrClear( p->vMapped );
@ -177,7 +254,7 @@ float If_ManScanMapping( If_Man_t * p )
/**Function*************************************************************
Synopsis [Computes the required times of all nodes.]
Synopsis [Computes area, references, and nodes used in the mapping.]
Description []
@ -186,45 +263,54 @@ float If_ManScanMapping( If_Man_t * p )
SeeAlso []
***********************************************************************/
void If_ManComputeRequired( If_Man_t * p, int fFirstTime )
float If_ManScanMappingSeq_rec( If_Man_t * p, If_Obj_t * pObj, Vec_Ptr_t * vMapped )
{
If_Obj_t * pObj;
int i;
// compute area, clean required times, collect nodes used in the mapping
p->AreaGlo = If_ManScanMapping( p );
// get the global required times
p->RequiredGlo = If_ManDelayMax( p );
// update the required times according to the target
if ( p->pPars->DelayTarget != -1 )
{
if ( p->RequiredGlo > p->pPars->DelayTarget + p->fEpsilon )
{
if ( fFirstTime )
printf( "Cannot meet the target required times (%4.2f). Mapping continues anyway.\n", p->pPars->DelayTarget );
}
else if ( p->RequiredGlo < p->pPars->DelayTarget - p->fEpsilon )
{
if ( fFirstTime )
printf( "Relaxing the required times from (%4.2f) to the target (%4.2f).\n", p->RequiredGlo, p->pPars->DelayTarget );
p->RequiredGlo = p->pPars->DelayTarget;
}
}
// set the required times for the POs
if ( p->pPars->fLatchPaths )
{
If_ManForEachLatch( p, pObj, i )
If_ObjFanin0(pObj)->Required = p->RequiredGlo;
}
else
{
If_ManForEachPo( p, pObj, i )
If_ObjFanin0(pObj)->Required = p->RequiredGlo;
}
// go through the nodes in the reverse topological order
Vec_PtrForEachEntry( p->vMapped, pObj, i )
If_CutPropagateRequired( p, If_ObjCutBest(pObj), pObj->Required );
If_Obj_t * pLeaf;
If_Cut_t * pCutBest;
float aArea;
int i, Shift;
if ( pObj->nRefs++ || If_ObjIsCi(pObj) || If_ObjIsConst1(pObj) )
return 0.0;
// store the node in the structure by level
assert( If_ObjIsAnd(pObj) );
// visit the transitive fanin of the selected cut
pCutBest = If_ObjCutBest(pObj);
aArea = If_ObjIsAnd(pObj)? If_CutLutArea(p, pCutBest) : (float)0.0;
If_CutForEachLeafSeq( p, pCutBest, pLeaf, Shift, i )
aArea += If_ManScanMappingSeq_rec( p, pLeaf, vMapped );
// add the node
Vec_PtrPush( vMapped, pObj );
return aArea;
}
/**Function*************************************************************
Synopsis [Computes area, references, and nodes used in the mapping.]
Description [Collects the nodes in reverse topological order in array
p->vMapping.]
SideEffects []
SeeAlso []
***********************************************************************/
float If_ManScanMappingSeq( If_Man_t * p )
{
If_Obj_t * pObj;
float aArea;
int i;
assert( p->pPars->fLiftLeaves );
// clean all references
If_ManForEachObj( p, pObj, i )
pObj->nRefs = 0;
// collect nodes reachable from POs in the DFS order through the best cuts
aArea = 0;
Vec_PtrClear( p->vMapped );
If_ManForEachPo( p, pObj, i )
aArea += If_ManScanMappingSeq_rec( p, If_ObjFanin0(pObj), p->vMapped );
return aArea;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///

2
src/map/if/module.make
View File

@ -1,10 +1,10 @@
SRC += src/map/if/ifCore.c \
src/map/if/ifCut.c \
src/map/if/ifLib.c \
src/map/if/ifMan.c \
src/map/if/ifMap.c \
src/map/if/ifPrepro.c \
src/map/if/ifReduce.c \
src/map/if/ifSeq.c \
src/map/if/ifTime.c \
src/map/if/ifTruth.c \
src/map/if/ifUtil.c

14
src/misc/nm/nmTable.c
View File

@ -187,12 +187,22 @@ Nm_Entry_t * Nm_ManTableLookupId( Nm_Man_t * p, int ObjId )
***********************************************************************/
Nm_Entry_t * Nm_ManTableLookupName( Nm_Man_t * p, char * pName, int Type )
{
Nm_Entry_t * pEntry;
Nm_Entry_t * pEntry, * pTemp;
int Counter = 0;
for ( pEntry = p->pBinsN2I[ Nm_HashString(pName, p->nBins) ]; pEntry; pEntry = pEntry->pNextN2I )
{
// check the entry itself
if ( !strcmp(pEntry->Name, pName) && (Type == -1 || pEntry->Type == (unsigned)Type) )
return pEntry;
return pEntry;
// if there is no namesakes, continue
if ( pEntry->pNameSake == NULL )
continue;
// check the list of namesakes
for ( pTemp = pEntry->pNameSake; pTemp != pEntry; pTemp = pTemp->pNameSake )
if ( !strcmp(pTemp->Name, pName) && (Type == -1 || pTemp->Type == (unsigned)Type) )
return pTemp;
}
return NULL;
}
/**Function*************************************************************

2
src/opt/ret/retCore.c
View File

@ -84,7 +84,7 @@ int Abc_NtkRetime( Abc_Ntk_t * pNtk, int Mode, int fForwardOnly, int fBackwardOn
RetValue += Abc_NtkRetimeIncremental( pNtk, 0, 1, fVerbose );
break;
case 6: // Pan's algorithm
RetValue = Abc_NtkRetimeLValue( pNtk, 200, fVerbose );
RetValue = Abc_NtkRetimeLValue( pNtk, 500, fVerbose );
break;
default:
printf( "Unknown retiming option.\n" );

18
src/opt/ret/retDelay.c
View File

@ -90,13 +90,9 @@ int Abc_NtkRetimeMinDelayTry( Abc_Ntk_t * pNtk, int fForward, int fInitial, int
pNtkNew = Abc_NtkRetimeBackwardInitialStart( pNtk );
}
}
if ( fVerbose )
{
if ( !fInitial )
printf( "Performing analysis:\n" );
else
printf( "Moving latches to the best position:\n" );
}
if ( fVerbose && !fInitial )
printf( "Performing analysis:\n" );
// find the best iteration
DelayBest = ABC_INFINITY; IterBest = 0; LatchesBest = Abc_NtkLatchNum(pNtk);
vCritical = Vec_PtrAlloc( 100 );
@ -109,7 +105,7 @@ if ( fVerbose )
// record this position if it has the best delay
if ( DelayBest > DelayCur )
{
if ( fVerbose )
if ( fVerbose && !fInitial )
printf( "%s Iter = %3d. Delay = %3d. Latches = %5d. Delta = %6.2f. Ratio = %4.2f %%\n",
fForward ? "Fwd": "Bwd", i, DelayCur, Abc_NtkLatchNum(pNtk),
1.0*(Abc_NtkLatchNum(pNtk)-LatchesBest)/(DelayBest-DelayCur),
@ -146,9 +142,9 @@ if ( fVerbose )
Vec_IntFree( vValues );
}
}
if ( !fInitial && fVerbose )
printf( "%s : Starting delay = %3d. Final delay = %3d. IterBest = %2d (out of %2d).\n",
fForward? "Forward " : "Backward", DelayStart, DelayBest, IterBest, nIterLimit );
if ( fVerbose && !fInitial )
printf( "%s : Starting delay = %3d. Final delay = %3d. IterBest = %2d (out of %2d).\n",
fForward? "Forward " : "Backward", DelayStart, DelayBest, IterBest, nIterLimit );
*pIterBest = IterBest;
return DelayBest;
}

288
src/opt/ret/retLvalue.c
View File

@ -29,11 +29,12 @@ enum { ABC_RET_UPDATE_FAIL, ABC_RET_UPDATE_NO, ABC_RET_UPDATE_YES };
// the internal procedures
static Vec_Int_t * Abc_NtkRetimeGetLags( Abc_Ntk_t * pNtk, int nIterLimit, int fVerbose );
static int Abc_NtkRetimeSearch_rec( Abc_Ntk_t * pNtk, Vec_Ptr_t * vNodes, Vec_Ptr_t * vLatches, int FiMin, int FiMax, int nMaxIters, int fVerbose );
static int Abc_NtkRetimeForPeriod( Abc_Ntk_t * pNtk, Vec_Ptr_t * vNodes, Vec_Ptr_t * vLatches, int Fi, int nMaxIters, int fVerbose );
static int Abc_NtkRetimeUpdateLValue( Abc_Ntk_t * pNtk, Vec_Ptr_t * vNodes, Vec_Ptr_t * vLatches, int Fi );
static int Abc_NtkRetimePosOverLimit( Abc_Ntk_t * pNtk, int Fi );
static Vec_Ptr_t * Abc_ManCollectLatches( Abc_Ntk_t * pNtk );
static int Abc_NtkRetimeUsingLags( Abc_Ntk_t * pNtk, Vec_Int_t * vLags, int fVerbose );
static int Abc_NtkRetimeSearch_rec( Abc_Ntk_t * pNtk, Vec_Ptr_t * vNodes, int FiMin, int FiMax, int nMaxIters, int fVerbose );
static int Abc_NtkRetimeForPeriod( Abc_Ntk_t * pNtk, Vec_Ptr_t * vNodes, int Fi, int nMaxIters, int fVerbose );
static int Abc_NtkRetimeNodeUpdateLValue( Abc_Obj_t * pObj, int Fi );
static Vec_Ptr_t * Abc_NtkRetimeCollect( Abc_Ntk_t * pNtk );
static inline int Abc_NodeComputeLag( int LValue, int Fi ) { return (LValue + (1<<16)*Fi)/Fi - (1<<16) - (int)(LValue % Fi == 0); }
static inline int Abc_NodeGetLValue( Abc_Obj_t * pNode ) { return (int)pNode->pCopy; }
@ -87,17 +88,18 @@ int Abc_NtkRetimeLValue( Abc_Ntk_t * pNtk, int nIterLimit, int fVerbose )
Vec_Int_t * Abc_NtkRetimeGetLags( Abc_Ntk_t * pNtk, int nIterLimit, int fVerbose )
{
Vec_Int_t * vLags;
Vec_Ptr_t * vNodes;
Vec_Ptr_t * vNodes, * vLatches;
Abc_Obj_t * pNode;
int i, FiMax, FiBest, RetValue, clk, clkIter;
char NodeLag;
// get the upper bound on the clock period
FiMax = 10 + Abc_NtkLevel(pNtk);
FiMax = Abc_NtkLevel(pNtk);
// make sure this clock period is feasible
vNodes = Abc_NtkRetimeCollect(pNtk);
if ( !Abc_NtkRetimeForPeriod( pNtk, vNodes, FiMax, nIterLimit, fVerbose ) )
vNodes = Abc_NtkDfs( pNtk, 0 );
vLatches = Abc_ManCollectLatches( pNtk );
if ( !Abc_NtkRetimeForPeriod( pNtk, vNodes, vLatches, FiMax, nIterLimit, fVerbose ) )
{
Vec_PtrFree( vNodes );
printf( "Abc_NtkRetimeGetLags() error: The upper bound on the clock period cannot be computed.\n" );
@ -106,13 +108,12 @@ Vec_Int_t * Abc_NtkRetimeGetLags( Abc_Ntk_t * pNtk, int nIterLimit, int fVerbose
// search for the optimal clock period between 0 and nLevelMax
clk = clock();
FiBest = Abc_NtkRetimeSearch_rec( pNtk, vNodes, 0, FiMax, nIterLimit, fVerbose );
FiBest = Abc_NtkRetimeSearch_rec( pNtk, vNodes, vLatches, 0, FiMax, nIterLimit, fVerbose );
clkIter = clock() - clk;
// recompute the best l-values
RetValue = Abc_NtkRetimeForPeriod( pNtk, vNodes, FiBest, nIterLimit, fVerbose );
RetValue = Abc_NtkRetimeForPeriod( pNtk, vNodes, vLatches, FiBest, nIterLimit, fVerbose );
assert( RetValue );
Vec_PtrFree( vNodes );
// fix the problem with non-converged delays
Abc_NtkForEachNode( pNtk, pNode, i )
@ -131,31 +132,16 @@ clkIter = clock() - clk;
// if ( fVerbose )
printf( "The best clock period is %3d. (Currently, network is not modified.)\n", FiBest );
/*
// print the statistic into a file
{
FILE * pTable;
pTable = fopen( "a/ret__stats.txt", "a+" );
fprintf( pTable, "%d ", FiBest );
fclose( pTable );
}
*/
/*
printf( "lvalues and lags : " );
Abc_NtkForEachNode( pNtk, pNode, i )
printf( "%d=%d(%d) ", pNode->Id, Abc_NodeGetLValue(pNode), Abc_NodeGetLag(pNode) );
printf( "\n" );
*/
/*
{
FILE * pTable;
pTable = fopen( "a/ret_stats_pan.txt", "a+" );
fprintf( pTable, "%s ", pNtk->pName );
pTable = fopen( "a/seqmap__stats.txt", "a+" );
fprintf( pTable, "%d ", FiBest );
fprintf( pTable, "\n" );
fclose( pTable );
}
*/
Vec_PtrFree( vNodes );
Vec_PtrFree( vLatches );
return vLags;
}
@ -170,17 +156,17 @@ clkIter = clock() - clk;
SeeAlso []
***********************************************************************/
int Abc_NtkRetimeSearch_rec( Abc_Ntk_t * pNtk, Vec_Ptr_t * vNodes, int FiMin, int FiMax, int nMaxIters, int fVerbose )
int Abc_NtkRetimeSearch_rec( Abc_Ntk_t * pNtk, Vec_Ptr_t * vNodes, Vec_Ptr_t * vLatches, int FiMin, int FiMax, int nMaxIters, int fVerbose )
{
int Median;
assert( FiMin < FiMax );
if ( FiMin + 1 == FiMax )
return FiMax;
Median = FiMin + (FiMax - FiMin)/2;
if ( Abc_NtkRetimeForPeriod( pNtk, vNodes, Median, nMaxIters, fVerbose ) )
return Abc_NtkRetimeSearch_rec( pNtk, vNodes, FiMin, Median, nMaxIters, fVerbose ); // Median is feasible
if ( Abc_NtkRetimeForPeriod( pNtk, vNodes, vLatches, Median, nMaxIters, fVerbose ) )
return Abc_NtkRetimeSearch_rec( pNtk, vNodes, vLatches, FiMin, Median, nMaxIters, fVerbose ); // Median is feasible
else
return Abc_NtkRetimeSearch_rec( pNtk, vNodes, Median, FiMax, nMaxIters, fVerbose ); // Median is infeasible
return Abc_NtkRetimeSearch_rec( pNtk, vNodes, vLatches, Median, FiMax, nMaxIters, fVerbose ); // Median is infeasible
}
/**Function*************************************************************
@ -194,56 +180,35 @@ int Abc_NtkRetimeSearch_rec( Abc_Ntk_t * pNtk, Vec_Ptr_t * vNodes, int FiMin, in
SeeAlso []
***********************************************************************/
int Abc_NtkRetimeForPeriod( Abc_Ntk_t * pNtk, Vec_Ptr_t * vNodes, int Fi, int nMaxIters, int fVerbose )
int Abc_NtkRetimeForPeriod( Abc_Ntk_t * pNtk, Vec_Ptr_t * vNodes, Vec_Ptr_t * vLatches, int Fi, int nMaxIters, int fVerbose )
{
Abc_Obj_t * pObj;
int i, c, fContained, fChange, RetValue, Counter;
char * pReason = "";
int c, i, fConverged;
// set l-values of all nodes to be minus infinity, except PIs and constants
Abc_NtkForEachObj( pNtk, pObj, i )
if ( Abc_ObjFaninNum(pObj) == 0 )
Abc_NodeSetLValue( pObj, 0 );
else
Abc_NodeSetLValue( pObj, -ABC_INFINITY );
// update all values iteratively
Counter = 0;
fContained = 1;
fChange = 1;
for ( c = 0; fContained && fChange && c < nMaxIters; c++ )
fConverged = 0;
for ( c = 1; c <= nMaxIters; c++ )
{
// go through the nodes and detect change
fChange = 0;
Vec_PtrForEachEntry( vNodes, pObj, i )
if ( !Abc_NtkRetimeUpdateLValue( pNtk, vNodes, vLatches, Fi ) )
{
RetValue = Abc_NtkRetimeNodeUpdateLValue( pObj, Fi );
if ( RetValue == ABC_RET_UPDATE_FAIL )
{
fContained = 0;
break;
}
if ( RetValue == ABC_RET_UPDATE_NO )
continue;
// updating happened
fChange = 1;
Counter++;
fConverged = 1;
break;
}
if ( Abc_NtkRetimePosOverLimit(pNtk, Fi) )
break;
}
if ( c == nMaxIters )
{
fContained = 0;
pReason = "(timeout)";
}
else
c++;
// report the results
if ( fVerbose )
{
if ( !fContained )
printf( "Period = %3d. Iterations = %3d. Updates = %10d. Infeasible %s\n", Fi, c, Counter, pReason );
if ( !fConverged )
printf( "Period = %3d. Iterations = %3d. Infeasible %s\n", Fi, c, (c > nMaxIters)? "(timeout)" : "" );
else
printf( "Period = %3d. Iterations = %3d. Updates = %10d. Feasible\n", Fi, c, Counter );
printf( "Period = %3d. Iterations = %3d. Feasible\n", Fi, c );
}
/*
// check if any AND gates have infinite delay
@ -253,55 +218,126 @@ int Abc_NtkRetimeForPeriod( Abc_Ntk_t * pNtk, Vec_Ptr_t * vNodes, int Fi, int nM
if ( Counter > 0 )
printf( "Warning: %d internal nodes have wrong l-values!\n", Counter );
*/
return fContained;
return fConverged;
}
/**Function*************************************************************
Synopsis [Computes the l-value of the node.]
Synopsis [Performs one iteration of l-value computation for the nodes.]
Description [The node can be internal or a PO.]
Description [Experimentally it was found that checking POs changes
is not enough to detect the convergence of l-values in the network.]
SideEffects []
SeeAlso []
***********************************************************************/
int Abc_NtkRetimeNodeUpdateLValue( Abc_Obj_t * pObj, int Fi )
int Abc_NtkRetimeUpdateLValue( Abc_Ntk_t * pNtk, Vec_Ptr_t * vNodes, Vec_Ptr_t * vLatches, int Fi )
{
Abc_Obj_t * pFanin;
int lValueNew, i;
// terminals
if ( Abc_ObjFaninNum(pObj) == 0 )
return ABC_RET_UPDATE_NO;
// primary outputs
if ( Abc_ObjIsPo(pObj) )
return (Abc_NodeGetLValue(Abc_ObjFanin0(pObj)) > Fi)? ABC_RET_UPDATE_FAIL : ABC_RET_UPDATE_NO;
// other types of objects
if ( Abc_ObjIsBi(pObj) || Abc_ObjIsBo(pObj) )
lValueNew = Abc_NodeGetLValue(Abc_ObjFanin0(pObj));
else if ( Abc_ObjIsLatch(pObj) )
lValueNew = Abc_NodeGetLValue(Abc_ObjFanin0(pObj)) - Fi;
else
Abc_Obj_t * pObj, * pFanin;
int i, k, lValueNew, fChange;
// go through the nodes and detect change
fChange = 0;
Vec_PtrForEachEntry( vNodes, pObj, i )
{
assert( Abc_ObjIsNode(pObj) );
lValueNew = -ABC_INFINITY;
Abc_ObjForEachFanin( pObj, pFanin, i )
Abc_ObjForEachFanin( pObj, pFanin, k )
{
if ( lValueNew < Abc_NodeGetLValue(pFanin) )
lValueNew = Abc_NodeGetLValue(pFanin);
}
lValueNew++;
if ( Abc_NodeGetLValue(pObj) < lValueNew )
{
Abc_NodeSetLValue( pObj, lValueNew );
fChange = 1;
}
}
// check if it needs to be updated
if ( lValueNew <= Abc_NodeGetLValue(pObj) )
return ABC_RET_UPDATE_NO;
// update if needed
Abc_NodeSetLValue( pObj, lValueNew );
return ABC_RET_UPDATE_YES;
// propagate values through the latches
Vec_PtrForEachEntry( vLatches, pObj, i )
Abc_NodeSetLValue( Abc_ObjFanout0(pObj), Abc_NodeGetLValue(Abc_ObjFanin0(Abc_ObjFanin0(pObj))) - Fi );
return fChange;
}
/**Function*************************************************************
Synopsis [Implements the retiming given as a set of retiming lags.]
Synopsis [Detects the case when l-values exceeded the limit.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Abc_NtkRetimePosOverLimit( Abc_Ntk_t * pNtk, int Fi )
{
Abc_Obj_t * pObj;
int i;
Abc_NtkForEachPo( pNtk, pObj, i )
if ( Abc_NodeGetLValue(Abc_ObjFanin0(pObj)) > Fi )
return 1;
return 0;
}
/**Function*************************************************************
Synopsis [Collects latches in the topological order.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Abc_ManCollectLatches_rec( Abc_Obj_t * pObj, Vec_Ptr_t * vLatches )
{
Abc_Obj_t * pDriver;
if ( !Abc_ObjIsLatch(pObj) )
return;
// skip already collected latches
if ( Abc_NodeIsTravIdCurrent(pObj) )
return;
Abc_NodeSetTravIdCurrent(pObj);
// get the driver node feeding into the latch
pDriver = Abc_ObjFanin0(Abc_ObjFanin0(pObj));
// call recursively if the driver looks like a latch output
if ( Abc_ObjIsBo(pDriver) )
Abc_ManCollectLatches_rec( Abc_ObjFanin0(pDriver), vLatches );
// collect the latch
Vec_PtrPush( vLatches, pObj );
}
/**Function*************************************************************
Synopsis [Collects latches in the topological order.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Ptr_t * Abc_ManCollectLatches( Abc_Ntk_t * pNtk )
{
Vec_Ptr_t * vLatches;
Abc_Obj_t * pObj;
int i;
vLatches = Vec_PtrAlloc( Abc_NtkLatchNum(pNtk) );
Abc_NtkIncrementTravId( pNtk );
Abc_NtkForEachLatch( pNtk, pObj, i )
Abc_ManCollectLatches_rec( pObj, vLatches );
assert( Vec_PtrSize(vLatches) == Abc_NtkLatchNum(pNtk) );
return vLatches;
}
/**Function*************************************************************
Synopsis [Implements the retiming given as the array of retiming lags.]
Description []
@ -344,74 +380,6 @@ int Abc_NtkRetimeUsingLags( Abc_Ntk_t * pNtk, Vec_Int_t * vLags, int fVerbose )
return 1;
}
/**Function*************************************************************
Synopsis [Collect objects in the topological order from the latch inputs.]
Description [If flag fOnlyMarked is set, collects only marked nodes.
Otherwise, collects only unmarked nodes.]
SideEffects []
SeeAlso []
***********************************************************************/
void Abc_NtkRetimeCollect_rec( Abc_Obj_t * pObj, int fOnlyMarked, Vec_Ptr_t * vNodes )
{
Abc_Obj_t * pFanin;
int i;
// skip collected nodes
if ( Abc_NodeIsTravIdCurrent(pObj) )
return;
Abc_NodeSetTravIdCurrent(pObj);
// collect recursively
if ( fOnlyMarked ^ pObj->fMarkA )
return;
// visit the fanins
Abc_ObjForEachFanin( pObj, pFanin, i )
Abc_NtkRetimeCollect_rec( pFanin, fOnlyMarked, vNodes );
// collect non-trivial objects
if ( Abc_ObjFaninNum(pObj) > 0 )
Vec_PtrPush( vNodes, pObj );
}
/**Function*************************************************************
Synopsis [Collect objects in the topological order using LIs as a cut.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Ptr_t * Abc_NtkRetimeCollect( Abc_Ntk_t * pNtk )
{
Vec_Ptr_t * vNodes;
Abc_Obj_t * pObj, * pFanin;
int i, k;
vNodes = Vec_PtrAlloc( 100 );
// mark the latch inputs
Abc_NtkForEachLatch( pNtk, pObj, i )
Abc_ObjFanin0(pObj)->fMarkA = 1;
// collect nodes in the DFS order from the marked nodes
Abc_NtkIncrementTravId(pNtk);
Abc_NtkForEachPo( pNtk, pObj, i )
Abc_NtkRetimeCollect_rec( pObj, 0, vNodes );
Abc_NtkForEachLatch( pNtk, pObj, i )
Abc_ObjForEachFanin( Abc_ObjFanin0(pObj), pFanin, k )
Abc_NtkRetimeCollect_rec( pFanin, 0, vNodes );
// collect marked nodes
Abc_NtkIncrementTravId(pNtk);
Abc_NtkForEachLatch( pNtk, pObj, i )
Abc_NtkRetimeCollect_rec( Abc_ObjFanin0(pObj), 1, vNodes );
// clean the marks
Abc_NtkForEachLatch( pNtk, pObj, i )
Abc_ObjFanin0(pObj)->fMarkA = 0;
return vNodes;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////