src/map/fpga/fpgaLib.c

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#include "fpgaInt.h"



int         Fpga_LutLibReadVarMax( Fpga_LutLib_t * p )               { return p->LutMax;     }
float *     Fpga_LutLibReadLutAreas( Fpga_LutLib_t * p )             { return p->pLutAreas;  }
float       Fpga_LutLibReadLutArea( Fpga_LutLib_t * p, int Size )    { assert( Size <= p->LutMax ); return p->pLutAreas[Size];  }

Fpga_LutLib_t * Fpga_LutLibCreate( char * FileName, int fVerbose )
{
    char pBuffer[1000], * pToken;
    Fpga_LutLib_t * p;
    FILE * pFile;
    int i, k;

    pFile = fopen( FileName, "r" );
    if ( pFile == NULL )
    {
        printf( "Cannot open LUT library file \"%s\".\n", FileName );
        return NULL;
    }

    p = ALLOC( Fpga_LutLib_t, 1 );
    memset( p, 0, sizeof(Fpga_LutLib_t) );
    p->pName = Extra_UtilStrsav( FileName );

    i = 1;
    while ( fgets( pBuffer, 1000, pFile ) != NULL )
    {
        pToken = strtok( pBuffer, " \t\n" );
        if ( pToken == NULL )
            continue;
        if ( pToken[0] == '#' )
            continue;
        if ( i != atoi(pToken) )
        {
            printf( "Error in the LUT library file \"%s\".\n", FileName );
            free( p );
            return NULL;
        }

        // read area
        pToken = strtok( NULL, " \t\n" );
        p->pLutAreas[i] = (float)atof(pToken);

        // read delays
        k = 0;
        while ( pToken = strtok( NULL, " \t\n" ) )
            p->pLutDelays[i][k++] = (float)atof(pToken);

        // check for out-of-bound
        if ( k > i )
        {
            printf( "LUT %d has too many pins (%d). Max allowed is %d.\n", i, k, i );
            return NULL;
        }

        // check if var delays are specifies
        if ( k > 1 )
            p->fVarPinDelays = 1;

        if ( i == FPGA_MAX_LUTSIZE )
        {
            printf( "Skipping LUTs of size more than %d.\n", i );
            return NULL;
        }
        i++;
    }
    p->LutMax = i-1;
    if ( p->LutMax > FPGA_MAX_LEAVES )
    {
        p->LutMax = FPGA_MAX_LEAVES;
        printf( "Warning: LUTs with more than %d input will not be used.\n", FPGA_MAX_LEAVES );
    }

    // check the library
    if ( p->fVarPinDelays )
    {
        for ( i = 1; i <= p->LutMax; i++ )
            for ( k = 0; k < i; k++ )
            {
                if ( p->pLutDelays[i][k] <= 0.0 )
                    printf( "Warning: Pin %d of LUT %d has delay %f. Pin delays should be non-negative numbers. Technology mapping may not work correctly.\n", 
                        k, i, p->pLutDelays[i][k] );
                if ( k && p->pLutDelays[i][k-1] > p->pLutDelays[i][k] )
                    printf( "Warning: Pin %d of LUT %d has delay %f. Pin %d of LUT %d has delay %f. Pin delays should be in non-decreasing order. Technology mapping may not work correctly.\n", 
                        k-1, i, p->pLutDelays[i][k-1], 
                        k, i, p->pLutDelays[i][k] );
            }
    }
    else
    {
        for ( i = 1; i <= p->LutMax; i++ )
        {
            if ( p->pLutDelays[i][0] <= 0.0 )
                printf( "Warning: LUT %d has delay %f. Pin delays should be non-negative numbers. Technology mapping may not work correctly.\n", 
                    k, i, p->pLutDelays[i][0] );
        }
    }

    return p;
}

Fpga_LutLib_t * Fpga_LutLibDup( Fpga_LutLib_t * p )
{
    Fpga_LutLib_t * pNew;
    pNew = ALLOC( Fpga_LutLib_t, 1 );
    *pNew = *p;
    pNew->pName = Extra_UtilStrsav( pNew->pName );
    return pNew;
}

void Fpga_LutLibFree( Fpga_LutLib_t * pLutLib )
{
    if ( pLutLib == NULL )
        return;
    FREE( pLutLib->pName );
    FREE( pLutLib );
}


void Fpga_LutLibPrint( Fpga_LutLib_t * pLutLib )
{
    int i, k;
    printf( "# The area/delay of k-variable LUTs:\n" );
    printf( "# k    area     delay\n" );
    if ( pLutLib->fVarPinDelays )
    {
        for ( i = 1; i <= pLutLib->LutMax; i++ )
        {
            printf( "%d   %7.2f  ", i, pLutLib->pLutAreas[i] );
            for ( k = 0; k < i; k++ )
                printf( " %7.2f", pLutLib->pLutDelays[i][k] );
            printf( "\n" );
        }
    }
    else
        for ( i = 1; i <= pLutLib->LutMax; i++ )
            printf( "%d   %7.2f   %7.2f\n", i, pLutLib->pLutAreas[i], pLutLib->pLutDelays[i][0] );
}

int Fpga_LutLibDelaysAreDiscrete( Fpga_LutLib_t * pLutLib )
{
    float Delay;
    int i;
    for ( i = 1; i <= pLutLib->LutMax; i++ )
    {
        Delay = pLutLib->pLutDelays[i][0];
        if ( ((float)((int)Delay)) != Delay )
            return 0;
    }
    return 1;
}

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