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/**CFile****************************************************************
FileName [ifLib.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [FPGA mapping based on priority cuts.]
Synopsis [LUT library.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - November 21, 2006.]
Revision [$Id: ifLib.c,v 1.00 2006/11/21 00:00:00 alanmi Exp $]
***********************************************************************/
#include "if.h"
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
static inline char * If_UtilStrsav( char *s ) { return !s ? s : strcpy(ALLOC(char, strlen(s)+1), s); }
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Reads the description of LUTs from the LUT library file.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
If_Lib_t * If_LutLibRead( char * FileName )
{
char pBuffer[1000], * pToken;
If_Lib_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( If_Lib_t, 1 );
memset( p, 0, sizeof(If_Lib_t) );
p->pName = If_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 specified
if ( k > 1 )
p->fVarPinDelays = 1;
if ( i == IF_MAX_LUTSIZE )
{
printf( "Skipping LUTs of size more than %d.\n", i );
return NULL;
}
i++;
}
p->LutMax = i-1;
// 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",
i, p->pLutDelays[i][0] );
}
}
return p;
}
/**Function*************************************************************
Synopsis [Duplicates the LUT library.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
If_Lib_t * If_LutLibDup( If_Lib_t * p )
{
If_Lib_t * pNew;
pNew = ALLOC( If_Lib_t, 1 );
*pNew = *p;
pNew->pName = If_UtilStrsav( pNew->pName );
return pNew;
}
/**Function*************************************************************
Synopsis [Frees the LUT library.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void If_LutLibFree( If_Lib_t * pLutLib )
{
if ( pLutLib == NULL )
return;
FREE( pLutLib->pName );
FREE( pLutLib );
}
/**Function*************************************************************
Synopsis [Prints the LUT library.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void If_LutLibPrint( If_Lib_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] );
}
/**Function*************************************************************
Synopsis [Returns 1 if the delays are discrete.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int If_LutLibDelaysAreDiscrete( If_Lib_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;
}
/**Function*************************************************************
Synopsis [Returns 1 if the delays are discrete.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int If_LutLibDelaysAreDifferent( If_Lib_t * pLutLib )
{
int i, k;
float Delay = pLutLib->pLutDelays[1][0];
if ( pLutLib->fVarPinDelays )
{
for ( i = 2; i <= pLutLib->LutMax; i++ )
for ( k = 0; k < i; k++ )
if ( pLutLib->pLutDelays[i][k] != Delay )
return 1;
}
else
{
for ( i = 2; i <= pLutLib->LutMax; i++ )
if ( pLutLib->pLutDelays[i][0] != Delay )
return 1;
}
return 0;
}
/**Function*************************************************************
Synopsis [Sets simple LUT library.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
If_Lib_t * If_SetSimpleLutLib( int nLutSize )
{
If_Lib_t s_LutLib10= { "lutlib",10, 0, {0,1,1,1,1,1,1,1,1,1,1}, {{0},{1},{1},{1},{1},{1},{1},{1},{1},{1},{1}} };
If_Lib_t s_LutLib9 = { "lutlib", 9, 0, {0,1,1,1,1,1,1,1,1,1}, {{0},{1},{1},{1},{1},{1},{1},{1},{1},{1}} };
If_Lib_t s_LutLib8 = { "lutlib", 8, 0, {0,1,1,1,1,1,1,1,1}, {{0},{1},{1},{1},{1},{1},{1},{1},{1}} };
If_Lib_t s_LutLib7 = { "lutlib", 7, 0, {0,1,1,1,1,1,1,1}, {{0},{1},{1},{1},{1},{1},{1},{1}} };
If_Lib_t s_LutLib6 = { "lutlib", 6, 0, {0,1,1,1,1,1,1}, {{0},{1},{1},{1},{1},{1},{1}} };
If_Lib_t s_LutLib5 = { "lutlib", 5, 0, {0,1,1,1,1,1}, {{0},{1},{1},{1},{1},{1}} };
If_Lib_t s_LutLib4 = { "lutlib", 4, 0, {0,1,1,1,1}, {{0},{1},{1},{1},{1}} };
If_Lib_t s_LutLib3 = { "lutlib", 3, 0, {0,1,1,1}, {{0},{1},{1},{1}} };
If_Lib_t * pLutLib;
assert( nLutSize >= 3 && nLutSize <= 10 );
switch ( nLutSize )
{
case 3: pLutLib = &s_LutLib3; break;
case 4: pLutLib = &s_LutLib4; break;
case 5: pLutLib = &s_LutLib5; break;
case 6: pLutLib = &s_LutLib6; break;
case 7: pLutLib = &s_LutLib7; break;
case 8: pLutLib = &s_LutLib8; break;
case 9: pLutLib = &s_LutLib9; break;
case 10: pLutLib = &s_LutLib10; break;
default: pLutLib = NULL; break;
}
if ( pLutLib == NULL )
return NULL;
return If_LutLibDup(pLutLib);
}
/**Function*************************************************************
Synopsis [Gets the delay of the fastest pin.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
float If_LutLibFastestPinDelay( If_Lib_t * p )
{
return !p? 1.0 : p->pLutDelays[p->LutMax][0];
}
/**Function*************************************************************
Synopsis [Gets the delay of the slowest pin.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
float If_LutLibSlowestPinDelay( If_Lib_t * p )
{
return !p? 1.0 : (p->fVarPinDelays? p->pLutDelays[p->LutMax][p->LutMax-1]: p->pLutDelays[p->LutMax][0]);
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
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