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/****************************************************************************
Copyright (C) 1987-2005 by Jeffery P. Hansen
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
****************************************************************************/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "gsim.h"
#define MULT_Z 0
#define MULT_A 1
#define MULT_B 2
#define MULT_DELAY 0
#if USELONGLONG
#define MULT_MAXBITS (2*SSWORDSIZE)
#else
#define MULT_MAXBITS SSWORDSIZE
#endif
static void Mult_processEvent(SGate*,EvQueue*,SEvent*);
static int Mult_checkGate(SGate*);
static SGateInfo mult_info = {
0,
"mult",0x1,
3,{{"P",GIO_OUT,0},
{"A",GIO_IN,0},
{"B",GIO_IN,0}},
{{"A/B-P",bit(1)|bit(2),0},
{0}},
Generic_copyGate,
Mult_processEvent,
Mult_checkGate,
Nop_initGate,
Generic_setProp,
0,
0,
Generic_propFrwdDelay,
Generic_propBackDelay,
Generic_delay,
};
void init_mult()
{
SGateInfo_register(&mult_info,0);
}
static int Mult_checkGate(SGate *g)
{
SPort *Z = g->g_ports.port[MULT_Z];
if (Z->p_net->n_nbits > MULT_MAXBITS) {
errorGate(g->g_name,"Multiplier outputs greater than %s bits unsupported.",MULT_MAXBITS);
return -1;
}
return 0;
}
static void Mult_processEvent(SGate *g,EvQueue *Q,SEvent *E)
{
SPort *Z = g->g_ports.port[MULT_Z];
SState *aS = SGate_allocPortState(g,MULT_A);
SState *bS = SGate_allocPortState(g,MULT_B);
SState *S = alloc_SState();
SState_reinit(S,Z->p_state.nbits);
if (!SState_isValue(aS) || !SState_isValue(bS)) {
SState_unknown(S);
} else {
#if USELONGLONG
unsigned long long A,B,P;
if (aS->nbits > SSWORDSIZE)
A = aS->one[0] | ((((unsigned long long)aS->one[1]) << SSWORDSIZE)&LMASK(aS->nbits&SSBITMASK));
else
A = aS->one[0] & LMASK(aS->nbits);
if (bS->nbits > SSWORDSIZE)
B = bS->one[0] | ((((unsigned long long)bS->one[1]) << SSWORDSIZE)&LMASK(bS->nbits&SSBITMASK));
else
B = bS->one[0] & LMASK(bS->nbits);
P = A*B;
S->one[0] = P;
S->zero[0] = ~P;
S->flt[0] = 0;
if (S->nbits > SSWORDSIZE) {
P >>= SSWORDSIZE;
S->one[1] = P;
S->zero[1] = ~P;
S->flt[1] = 0;
}
#else
unsigned A,B,P;
A = aS->one[0] & LMASK(aS->nbits);
B = bS->one[0] & LMASK(bS->nbits);
P = A*B;
S->one[0] = P;
S->zero[0] = ~P;
S->flt[0] = 0;
#endif
}
EvQueue_setPort(Q,Z,S,g->g_delayParms[MULT_DELAY]);
free_SState(aS);
free_SState(bS);
free_SState(S);
}
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