src/map/mapper/mapperTime.c File Reference

#include "mapperInt.h"

Include dependency graph for mapperTime.c:

Go to the source code of this file.

Functions
static void	Map_TimePropagateRequired (Map_Man_t *p, Map_NodeVec_t *vNodes)
static void	Map_TimePropagateRequiredPhase (Map_Man_t *p, Map_Node_t *pNode, int fPhase)
static float	Map_MatchComputeReqTimes (Map_Cut_t *pCut, int fPhase, Map_Time_t *ptArrRes)
float	Map_TimeMatchWithInverter (Map_Man_t *p, Map_Match_t *pMatch)
void	Map_TimeCutComputeArrival_rec (Map_Cut_t *pCut, int fPhase)
float	Map_TimeCutComputeArrival (Map_Node_t *pNode, Map_Cut_t *pCut, int fPhase, float tWorstLimit)
float	Map_TimeComputeArrivalMax (Map_Man_t *p)
void	Map_TimeComputeRequiredGlobal (Map_Man_t *p)
void	Map_TimeComputeRequired (Map_Man_t *p, float fRequired)

---

Function Documentation

float Map_MatchComputeReqTimes	(	Map_Cut_t *	pCut,
		int	fPhase,
		Map_Time_t *	ptArrRes
	)			[static]

Function*************************************************************

Synopsis [Computes the arrival times of the cut.]

Description [Computes the arrival times of the cut if it is implemented using the given supergate with the given phase. Uses the constraint-type specification of rise/fall arrival times.]

SideEffects []

SeeAlso []

Definition at line 448 of file mapperTime.c.

{
    Map_Time_t * ptArrIn;
    Map_Super_t * pSuper;
    unsigned uPhaseTot;
    int fPinPhase, i;
    float tDelay;

    // get the supergate and the phase
    pSuper = pCut->M[fPhase].pSuperBest;
    uPhaseTot = pCut->M[fPhase].uPhaseBest;

    // propagate the arrival times 
    ptArrRes->Rise = ptArrRes->Fall = -MAP_FLOAT_LARGE;
    for ( i = 0; i < pCut->nLeaves; i++ )
    {
        // get the phase of the given pin
        fPinPhase = ((uPhaseTot & (1 << i)) == 0);
        ptArrIn = pCut->ppLeaves[i]->tRequired + fPinPhase;
//        assert( ptArrIn->Worst < MAP_FLOAT_LARGE );

        // get the rise of the output due to rise of the inputs
        if ( pSuper->tDelaysR[i].Rise > 0 )
        {
            tDelay = ptArrIn->Rise + pSuper->tDelaysR[i].Rise;
            if ( ptArrRes->Rise < tDelay )
                ptArrRes->Rise = tDelay;
        }

        // get the rise of the output due to fall of the inputs
        if ( pSuper->tDelaysR[i].Fall > 0 )
        {
            tDelay = ptArrIn->Fall + pSuper->tDelaysR[i].Fall;
            if ( ptArrRes->Rise < tDelay )
                ptArrRes->Rise = tDelay;
        }

        // get the fall of the output due to rise of the inputs
        if ( pSuper->tDelaysF[i].Rise > 0 )
        {
            tDelay = ptArrIn->Rise + pSuper->tDelaysF[i].Rise;
            if ( ptArrRes->Fall < tDelay )
                ptArrRes->Fall = tDelay;
        }

        // get the fall of the output due to fall of the inputs
        if ( pSuper->tDelaysF[i].Fall > 0 )
        {
            tDelay = ptArrIn->Fall + pSuper->tDelaysF[i].Fall;
            if ( ptArrRes->Fall < tDelay )
                ptArrRes->Fall = tDelay;
        }
    }
    // return the worst-case of rise/fall arrival times
    return MAP_MAX(ptArrRes->Rise, ptArrRes->Fall);
}

float Map_TimeComputeArrivalMax

(

Map_Man_t *

p

)

Function*************************************************************

Synopsis [Computes the maximum arrival times.]

Description []

SideEffects []

SeeAlso []

Definition at line 168 of file mapperTime.c.

{
    float tReqMax, tReq;
    int i, fPhase;
    // get the critical PO arrival time
    tReqMax = -MAP_FLOAT_LARGE;
    for ( i = 0; i < p->nOutputs; i++ )
    {
        if ( Map_NodeIsConst(p->pOutputs[i]) )
            continue;
        fPhase  = !Map_IsComplement(p->pOutputs[i]);
        tReq    = Map_Regular(p->pOutputs[i])->tArrival[fPhase].Worst;
        tReqMax = MAP_MAX( tReqMax, tReq );
    }
    return tReqMax;
}

void Map_TimeComputeRequired	(	Map_Man_t *	p,
		float	fRequired
	)

Function*************************************************************

Synopsis [Computes the required times of all nodes.]

Description [This procedure assumes that the nodes used in the mapping are collected in p->vMapping.]

SideEffects []

SeeAlso []

Definition at line 229 of file mapperTime.c.

{
    Map_Time_t * ptTime;
    int fPhase, i;

    // clean the required times
    for ( i = 0; i < p->vAnds->nSize; i++ )
    {
        p->vAnds->pArray[i]->tRequired[0].Rise = MAP_FLOAT_LARGE;
        p->vAnds->pArray[i]->tRequired[0].Fall = MAP_FLOAT_LARGE;
        p->vAnds->pArray[i]->tRequired[0].Worst = MAP_FLOAT_LARGE;
        p->vAnds->pArray[i]->tRequired[1].Rise = MAP_FLOAT_LARGE;
        p->vAnds->pArray[i]->tRequired[1].Fall = MAP_FLOAT_LARGE;
        p->vAnds->pArray[i]->tRequired[1].Worst = MAP_FLOAT_LARGE;
    }

    // set the required times for the POs
    for ( i = 0; i < p->nOutputs; i++ )
    {
        fPhase  = !Map_IsComplement(p->pOutputs[i]);
        ptTime  =  Map_Regular(p->pOutputs[i])->tRequired + fPhase;
        ptTime->Rise = ptTime->Fall = ptTime->Worst = fRequired;
    }

    // sorts the nodes in the decreasing order of levels
    // this puts the nodes in reverse topological order
//    Map_MappingSortByLevel( p, p->vMapping );
    // the array is already sorted by construction in Map_MappingSetRefs()

    Map_TimePropagateRequired( p, p->vMapping );
}

void Map_TimeComputeRequiredGlobal

(

Map_Man_t *

p

)

Function*************************************************************

Synopsis [Computes the required times of all nodes.]

Description []

SideEffects []

SeeAlso []

Definition at line 196 of file mapperTime.c.

{
    p->fRequiredGlo = Map_TimeComputeArrivalMax( p );
    // update the required times according to the target
    if ( p->DelayTarget != -1 )
    {
        if ( p->fRequiredGlo > p->DelayTarget + p->fEpsilon )
        {
            if ( p->fMappingMode == 1 )
                printf( "Cannot meet the target required times (%4.2f). Continue anyway.\n", p->DelayTarget );
        }
        else if ( p->fRequiredGlo < p->DelayTarget - p->fEpsilon )
        {
            if ( p->fMappingMode == 1 )
                printf( "Relaxing the required times from (%4.2f) to the target (%4.2f).\n", p->fRequiredGlo, p->DelayTarget );
            p->fRequiredGlo = p->DelayTarget;
        }
    }
    Map_TimeComputeRequired( p, p->fRequiredGlo );
}

float Map_TimeCutComputeArrival	(	Map_Node_t *	pNode,
		Map_Cut_t *	pCut,
		int	fPhase,
		float	tWorstLimit
	)

Function*************************************************************

Synopsis [Computes the arrival times of the cut.]

Description [Computes the arrival times of the cut if it is implemented using the given supergate with the given phase. Uses the constraint-type specification of rise/fall arrival times.]

SideEffects []

SeeAlso []

Definition at line 92 of file mapperTime.c.

{
    Map_Match_t * pM = pCut->M + fPhase;
    Map_Super_t * pSuper = pM->pSuperBest;
    unsigned uPhaseTot = pM->uPhaseBest;
    Map_Time_t * ptArrRes = &pM->tArrive;
    Map_Time_t * ptArrIn;
    bool fPinPhase;
    float tDelay;
    int i;

    ptArrRes->Rise  = ptArrRes->Fall = 0.0;
    ptArrRes->Worst = MAP_FLOAT_LARGE;
    for ( i = pCut->nLeaves - 1; i >= 0; i-- )
    {
        // get the phase of the given pin
        fPinPhase = ((uPhaseTot & (1 << i)) == 0);
        ptArrIn = pCut->ppLeaves[i]->tArrival + fPinPhase;

        // get the rise of the output due to rise of the inputs
        if ( pSuper->tDelaysR[i].Rise > 0 )
        {
            tDelay = ptArrIn->Rise + pSuper->tDelaysR[i].Rise;
            if ( tDelay > tWorstLimit )
                return MAP_FLOAT_LARGE;
            if ( ptArrRes->Rise < tDelay )
                ptArrRes->Rise = tDelay;
        }

        // get the rise of the output due to fall of the inputs
        if ( pSuper->tDelaysR[i].Fall > 0 )
        {
            tDelay = ptArrIn->Fall + pSuper->tDelaysR[i].Fall;
            if ( tDelay > tWorstLimit )
                return MAP_FLOAT_LARGE;
            if ( ptArrRes->Rise < tDelay )
                ptArrRes->Rise = tDelay;
        }

        // get the fall of the output due to rise of the inputs
        if ( pSuper->tDelaysF[i].Rise > 0 )
        {
            tDelay = ptArrIn->Rise + pSuper->tDelaysF[i].Rise;
            if ( tDelay > tWorstLimit )
                return MAP_FLOAT_LARGE;
            if ( ptArrRes->Fall < tDelay )
                ptArrRes->Fall = tDelay;
        }

        // get the fall of the output due to fall of the inputs
        if ( pSuper->tDelaysF[i].Fall > 0 )
        {
            tDelay = ptArrIn->Fall + pSuper->tDelaysF[i].Fall;
            if ( tDelay > tWorstLimit )
                return MAP_FLOAT_LARGE;
            if ( ptArrRes->Fall < tDelay )
                ptArrRes->Fall = tDelay;
        }
    }
    // return the worst-case of rise/fall arrival times
    ptArrRes->Worst = MAP_MAX(ptArrRes->Rise, ptArrRes->Fall);
    return ptArrRes->Worst;
}

void Map_TimeCutComputeArrival_rec	(	Map_Cut_t *	pCut,
		int	fPhase
	)

Function*************************************************************

Synopsis [Computes the arrival times of the cut recursively.]

Description [When computing the arrival time for the previously unused cuts, their arrival time may be incorrect because their fanins have incorrect arrival time. This procedure is called to fix this problem.]

SideEffects []

SeeAlso []

Definition at line 66 of file mapperTime.c.

{
    int i, fPhaseLeaf;
    for ( i = 0; i < pCut->nLeaves; i++ )
    {
        fPhaseLeaf = Map_CutGetLeafPhase( pCut, fPhase, i );
        if ( pCut->ppLeaves[i]->nRefAct[fPhaseLeaf] > 0 )
            continue;
        Map_TimeCutComputeArrival_rec( pCut->ppLeaves[i]->pCutBest[fPhaseLeaf], fPhaseLeaf );
    }
    Map_TimeCutComputeArrival( NULL, pCut, fPhase, MAP_FLOAT_LARGE );
}

float Map_TimeMatchWithInverter	(	Map_Man_t *	p,
		Map_Match_t *	pMatch
	)

FUNCTION DEFINITIONS ///function*************************************************************

synopsis [Computes the exact area associated with the cut.]

description []

sideeffects []

seealso []

Definition at line 44 of file mapperTime.c.

{
    Map_Time_t tArrInv;
    tArrInv.Fall  = pMatch->tArrive.Rise + p->pSuperLib->tDelayInv.Fall;
    tArrInv.Rise  = pMatch->tArrive.Fall + p->pSuperLib->tDelayInv.Rise;
    tArrInv.Worst = MAP_MAX( tArrInv.Rise, tArrInv.Fall ); 
    return tArrInv.Worst;
}

void Map_TimePropagateRequired	(	Map_Man_t *	p,
		Map_NodeVec_t *	vNodes
	)			[static]

CFile****************************************************************

FileName [mapperTime.c]

PackageName [MVSIS 1.3: Multi-valued logic synthesis system.]

Synopsis [Generic technology mapping engine.]

Author [MVSIS Group]

Affiliation [UC Berkeley]

Date [Ver. 2.0. Started - June 1, 2004.]

Revision [

Id

mapperTime.c,v 1.3 2005/03/02 02:35:54 alanmi Exp

] DECLARATIONS ///

Function*************************************************************

Synopsis [Computes the required times of the given nodes.]

Description []

SideEffects []

SeeAlso []

Definition at line 272 of file mapperTime.c.

{
    Map_Node_t * pNode;
    Map_Time_t tReqOutTest, * ptReqOutTest = &tReqOutTest;
    Map_Time_t * ptReqIn, * ptReqOut;
    int fPhase, k;

    // go through the nodes in the reverse topological order
    for ( k = 0; k < vNodes->nSize; k++ )
    {
        pNode = vNodes->pArray[k];

        // this computation works for regular nodes only
        assert( !Map_IsComplement(pNode) );
        // at least one phase should be mapped
        assert( pNode->pCutBest[0] != NULL || pNode->pCutBest[1] != NULL );
        // the node should be used in the currently assigned mapping
        assert( pNode->nRefAct[0] > 0 || pNode->nRefAct[1] > 0 );

        // if one of the cuts is not given, project the required times from the other cut
        if ( pNode->pCutBest[0] == NULL || pNode->pCutBest[1] == NULL )
        {
//            assert( 0 );
            // get the missing phase 
            fPhase = (pNode->pCutBest[1] == NULL); 
            // check if the missing phase is needed in the mapping
            if ( pNode->nRefAct[fPhase] > 0 )
            {
                // get the pointers to the required times of the missing phase
                ptReqOut = pNode->tRequired +  fPhase;
//                assert( ptReqOut->Fall < MAP_FLOAT_LARGE );
                // get the pointers to the required times of the present phase
                ptReqIn  = pNode->tRequired + !fPhase;
                // propagate the required times from the missing phase to the present phase
    //            tArrInv.Fall  = pMatch->tArrive.Rise + p->pSuperLib->tDelayInv.Fall;
    //            tArrInv.Rise  = pMatch->tArrive.Fall + p->pSuperLib->tDelayInv.Rise;
                ptReqIn->Fall = MAP_MIN( ptReqIn->Fall, ptReqOut->Rise - p->pSuperLib->tDelayInv.Rise );
                ptReqIn->Rise = MAP_MIN( ptReqIn->Rise, ptReqOut->Fall - p->pSuperLib->tDelayInv.Fall );
            }
        }

        // finalize the worst case computation
        pNode->tRequired[0].Worst = MAP_MIN( pNode->tRequired[0].Fall, pNode->tRequired[0].Rise );
        pNode->tRequired[1].Worst = MAP_MIN( pNode->tRequired[1].Fall, pNode->tRequired[1].Rise );

        // skip the PIs
        if ( !Map_NodeIsAnd(pNode) )
            continue;

        // propagate required times of different phases of the node
        // the ordering of phases does not matter since they are mapped independently
        if ( pNode->pCutBest[0] && pNode->tRequired[0].Worst < MAP_FLOAT_LARGE )
            Map_TimePropagateRequiredPhase( p, pNode, 0 );
        if ( pNode->pCutBest[1] && pNode->tRequired[1].Worst < MAP_FLOAT_LARGE )
            Map_TimePropagateRequiredPhase( p, pNode, 1 );
    }

    // in the end, we verify the required times
    // for this, we compute the arrival times of the outputs of each phase 
    // of the supergates using the fanins' required times as the fanins' arrival times
    // the resulting arrival time of the supergate should be less than the actual required time
    for ( k = 0; k < vNodes->nSize; k++ )
    {
        pNode = vNodes->pArray[k];
        if ( !Map_NodeIsAnd(pNode) )
            continue;
        // verify that the required times are propagated correctly
//        if ( pNode->pCutBest[0] && (pNode->nRefAct[0] > 0 || pNode->pCutBest[1] == NULL) )
        if ( pNode->pCutBest[0] && pNode->tRequired[0].Worst < MAP_FLOAT_LARGE )
        {
            Map_MatchComputeReqTimes( pNode->pCutBest[0], 0, ptReqOutTest );
            assert( ptReqOutTest->Rise < pNode->tRequired[0].Rise + p->fEpsilon );
            assert( ptReqOutTest->Fall < pNode->tRequired[0].Fall + p->fEpsilon );
        }
//        if ( pNode->pCutBest[1] && (pNode->nRefAct[1] > 0 || pNode->pCutBest[0] == NULL) )
        if ( pNode->pCutBest[1] && pNode->tRequired[1].Worst < MAP_FLOAT_LARGE )
        {
            Map_MatchComputeReqTimes( pNode->pCutBest[1], 1, ptReqOutTest );
            assert( ptReqOutTest->Rise < pNode->tRequired[1].Rise + p->fEpsilon );
            assert( ptReqOutTest->Fall < pNode->tRequired[1].Fall + p->fEpsilon );
        }
    }

}

void Map_TimePropagateRequiredPhase	(	Map_Man_t *	p,
		Map_Node_t *	pNode,
		int	fPhase
	)			[static]

Function*************************************************************

Synopsis [Computes the required times of the given nodes.]

Description []

SideEffects []

SeeAlso []

Definition at line 368 of file mapperTime.c.

{
    Map_Time_t * ptReqIn, * ptReqOut;
    Map_Cut_t * pCut;
    Map_Super_t * pSuper;
    float tNewReqTime;
    unsigned uPhase;
    int fPinPhase, i;

    // get the cut to be propagated
    pCut = pNode->pCutBest[fPhase];
    assert( pCut != NULL );
    // get the supergate and its polarity
    pSuper  = pCut->M[fPhase].pSuperBest;
    uPhase  = pCut->M[fPhase].uPhaseBest;
    // get the required time of the output of the supergate
    ptReqOut = pNode->tRequired + fPhase;
    // set the required time of the children
    for ( i = 0; i < pCut->nLeaves; i++ )
    {
        // get the phase of the given pin of the supergate
        fPinPhase = ((uPhase & (1 << i)) == 0);
        ptReqIn = pCut->ppLeaves[i]->tRequired + fPinPhase;
        assert( pCut->ppLeaves[i]->nRefAct[2] > 0 );

        // get the rise of the output due to rise of the inputs
//            if ( ptArrOut->Rise < ptArrIn->Rise + pSuper->tDelaysR[i].Rise )
//                ptArrOut->Rise = ptArrIn->Rise + pSuper->tDelaysR[i].Rise;
        if ( pSuper->tDelaysR[i].Rise > 0 )
        {
            tNewReqTime = ptReqOut->Rise - pSuper->tDelaysR[i].Rise;
            ptReqIn->Rise = MAP_MIN( ptReqIn->Rise, tNewReqTime );
        }

        // get the rise of the output due to fall of the inputs
//            if ( ptArrOut->Rise < ptArrIn->Fall + pSuper->tDelaysR[i].Fall )
//                ptArrOut->Rise = ptArrIn->Fall + pSuper->tDelaysR[i].Fall;
        if ( pSuper->tDelaysR[i].Fall > 0 )
        {
            tNewReqTime = ptReqOut->Rise - pSuper->tDelaysR[i].Fall;
            ptReqIn->Fall = MAP_MIN( ptReqIn->Fall, tNewReqTime );
        }

        // get the fall of the output due to rise of the inputs
//            if ( ptArrOut->Fall < ptArrIn->Rise + pSuper->tDelaysF[i].Rise )
//                ptArrOut->Fall = ptArrIn->Rise + pSuper->tDelaysF[i].Rise;
        if ( pSuper->tDelaysF[i].Rise > 0 )
        {
            tNewReqTime = ptReqOut->Fall - pSuper->tDelaysF[i].Rise;
            ptReqIn->Rise = MAP_MIN( ptReqIn->Rise, tNewReqTime );
        }

        // get the fall of the output due to fall of the inputs
//            if ( ptArrOut->Fall < ptArrIn->Fall + pSuper->tDelaysF[i].Fall )
//                ptArrOut->Fall = ptArrIn->Fall + pSuper->tDelaysF[i].Fall;
        if ( pSuper->tDelaysF[i].Fall > 0 )
        {
            tNewReqTime = ptReqOut->Fall - pSuper->tDelaysF[i].Fall;
            ptReqIn->Fall = MAP_MIN( ptReqIn->Fall, tNewReqTime );
        }
    }

    // compare the required times with the arrival times
    assert( pNode->tArrival[fPhase].Rise < ptReqOut->Rise + p->fEpsilon );
    assert( pNode->tArrival[fPhase].Fall < ptReqOut->Fall + p->fEpsilon );
}