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cell.cc
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/*************************************************************************
*
* Copyright (c) 2021 Rajit Manohar
*
* 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., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
**************************************************************************
*/
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <math.h>
#include <common/config.h>
#include <common/misc.h>
#include <common/atrace.h>
#include "liberty.h"
static int is_xyce (void)
{
if (strstr (config_get_string ("xcell.spice_binary"), "Xyce")) {
return 1;
}
return 0;
}
static int is_hspice (void)
{
return !is_xyce();
}
static void unlink_files (const char *s, const char *ext[])
{
char buf[1024];
int i = 0;
while (ext[i]) {
snprintf (buf, 1024, "%s.%s", s, ext[i]);
unlink (buf);
i++;
}
}
static void unlink_hspice (const char *s)
{
const char *ext[] = { "mt0", "st0", "tr0", "pa0", "ic0", NULL };
unlink_files (s, ext);
}
static void unlink_xyce (const char *s)
{
const char *ext[] = { "spi.mt0", "spi.raw", NULL };
unlink_files (s, ext);
}
static void unlink_generic (const char *s)
{
const char *ext[] = { "spi", "log", NULL };
unlink_files (s, ext);
if (is_xyce ()) {
unlink_xyce (s);
}
else if (is_hspice()) {
unlink_hspice (s);
}
}
static void unlink_generic_trace (const char *s)
{
const char *ext[] = { "trace", "names", NULL };
unlink_generic (s);
unlink_files (s, ext);
}
static void print_number (FILE *fp, double x)
{
if (x > 1e3) {
fprintf (fp, "%gK", x*1e-3);
}
if (x > 1e-3) {
fprintf (fp, "%g", x);
}
else if (x > 1e-9) {
fprintf (fp, "%gU", x*1e6);
}
else {
fprintf (fp, "%gP", x*1e12);
}
}
/*
start, end in picoseconds
*/
static void print_window (FILE *fp, double start, double end, int val)
{
static double vdd = -1;
if (vdd == -1) {
vdd = config_get_real ("xcell.Vdd");
}
fprintf (fp, "+");
print_number (fp, 1e-12*start);
if (val) {
fprintf (fp, " %g ", vdd);
}
else {
fprintf (fp, " 0 ");
}
print_number (fp, 1e-12*end);
if (val) {
fprintf (fp, " %g\n", vdd);
}
else {
fprintf (fp, " 0\n");
}
}
static struct Hashtable *parse_measurements (const char *s, const char *param = NULL, int skip = 0)
{
FILE *fp;
char buf[1024];
struct Hashtable *H;
hash_bucket_t *b;
int is_skip = 0;
fp = fopen (s, "r");
if (!fp) {
return NULL;
}
H = hash_new (8);
if (skip > 0 && param) {
is_skip = 1;
}
while (fgets (buf, 1024, fp)) {
double v;
char *s;
if (buf[0] == '.' || buf[0] == '$' || buf[0] == '#') {
continue;
}
s = strtok (buf, " \t");
if (!s) {
continue;
}
if (is_skip && (strcmp (s, param) == 0)) {
if (skip > 0) {
skip--;
continue;
}
is_skip = 0;
}
else if (is_skip) {
continue;
}
else if (param && (strcmp (s, param) == 0)) {
fclose (fp);
return H;
}
b = hash_add (H, s);
b->f = 0.0;
s = strtok (NULL, " \t");
if (!s) {
hash_delete (H, b->key);
continue;
}
if (strcmp (s, "=") != 0) {
hash_delete (H, b->key);
continue;
}
s = strtok (NULL, " \t");
if (!s) {
hash_delete (H, b->key);
continue;
}
if (sscanf (s, "%lg", &v) != 1) {
hash_delete (H, b->key);
continue;
}
b->f = v;
}
fclose (fp);
return H;
}
static const char *_cellinfo (Process *p)
{
static char buf[10240];
char *ns = NULL;
buf[0] = '\0';
if (p) {
if (p->getns() && p->getns() != ActNamespace::Global()) {
ns = p->getns()->Name();
snprintf (buf, 10240, "xcell.cells.%s::%s", ns, p->getName());
FREE (ns);
}
else {
snprintf (buf, 10240, "xcell.cells.%s", p->getName());
}
}
return buf;
}
#define CNLFP _l->_line(); fprintf
Cell::Cell (Liberty *l, Process *p)
{
_p = p;
_l = l;
a = ActNamespace::Act();
_lfp = l->_lfp;
A_INIT (_sh_vars);
_num_inputs = 0;
_num_outputs = 0;
_outvals = NULL;
leakage_power = NULL;
time_up = NULL;
time_dn = NULL;
fn_override = NULL;
_num_stateholding = 0;
_stateholding = NULL;
_is_out = NULL;
_is_external = 0;
_ext_type = 0;
A_INIT (dyn);
ActPass *ap = a->pass_find ("prs2net");
if (!ap) {
fatal_error ("Need netlist!");
}
np = dynamic_cast<ActNetlistPass *> (ap);
Assert (np, "What?");
nl = np->getNL (p);
if (!nl) {
warning ("No netlist found for process `%s'", p->getName());
return;
}
const char *cprefix = _cellinfo (_p);
char buf[1024];
snprintf (buf, 1024, "%s.spice", cprefix);
if (config_exists (buf)) {
_is_external = 1;
snprintf (buf, 1024, "%s.type", cprefix);
_ext_type = config_get_int (buf);
}
printf ("Cell: %s%s\n", p->getName(), _is_external ? " [external]" : "");
printf (" Ports:");
for (int i=0; i < A_LEN (nl->bN->ports); i++) {
if (nl->bN->ports[i].omit) continue;
printf (" ");
ActId *tmp = nl->bN->ports[i].c->toid();
tmp->Print (stdout);
delete tmp;
if (nl->bN->ports[i].input) {
printf (":I");
_num_inputs++;
}
else {
printf (":O");
_num_outputs++;
}
if (nl->bN->ports[i].bidir) {
printf ("B");
}
}
printf ("\n");
if (_num_inputs == 0 && _num_outputs == 0) {
_is_dataflow = 1;
/* -- check to see if this is a dataflow cell -- */
for (int i=0; i < A_LEN (nl->bN->chpports); i++) {
if (nl->bN->chpports[i].omit) continue;
/* -- check if this is an int! */
/* each channel is an input/output pair */
_num_inputs++;
_num_outputs++;
}
}
else {
_is_dataflow = 0;
}
if (_num_inputs == 0) {
warning ("Cell %s: no inputs?", nl->bN->p->getName());
nl = NULL;
return;
}
if (_num_inputs > 8) {
warning ("High fan-in cell?");
nl = NULL;
return;
}
if (_num_outputs == 0) {
warning ("Cell %s: no outputs?", nl->bN->p->getName());
nl = NULL;
return;
}
if (_is_dataflow) {
/* we're done! */
return;
}
if (_is_external) {
return;
}
/* prepare for circuit characterization, in particular collect detailed
information for state-holding cells.
First, count them.
*/
for (node_t *n = nl->hd; n; n = n->next) {
if (n->v) {
if (n->v->e_up || n->v->e_dn) {
/* there's a gate here */
if ((n->v->stateholding && (n->v->unstaticized != 2))
|| n->v->manualkeeper != 0) {
_num_stateholding++;
}
}
}
}
// printf ("num-sh = %d\n", _num_stateholding);
if (_num_stateholding > 0) {
MALLOC (_stateholding, struct stateholding_info, _num_stateholding);
_num_stateholding = 0;
/* assign nodes */
for (node_t *n = nl->hd; n; n = n->next) {
if (n->v) {
if (n->v->e_up || n->v->e_dn) {
/* there's a gate here */
if ((n->v->stateholding && (n->v->unstaticized != 2))
|| n->v->manualkeeper != 0) {
_stateholding[_num_stateholding++].n = n;
}
}
}
}
/* collect support */
A_INIT (_sh_vars);
for (int i=0; i < _num_stateholding; i++) {
/* -- analyze state-holding operator -- */
Assert (_stateholding[i].n->v, "What?");
_collect_support (_stateholding[i].n->v->e_up);
_collect_support (_stateholding[i].n->v->e_dn);
}
Assert (A_LEN (_sh_vars) > 0, "What?!");
for (int i=0; i < _num_stateholding; i++) {
_stateholding[i].tt[0] = bitset_new (1 << A_LEN (_sh_vars));
_stateholding[i].tt[1] = bitset_new (1 << A_LEN (_sh_vars));
bitset_clear (_stateholding[i].tt[0]);
bitset_clear (_stateholding[i].tt[1]);
_build_truth_table (_stateholding[i].n->v->e_up, _stateholding[i].tt[1]);
_build_truth_table (_stateholding[i].n->v->e_dn, _stateholding[i].tt[0]);
}
}
}
void Cell::_printHeader ()
{
CNLFP (_lfp, "cell(");
a->mfprintfproc (_lfp, _p);
fprintf (_lfp, ") {\n");
_l->_tab();
/* XXX what is this? */
CNLFP (_lfp, "area : 25;\n");
/* XXX: fixme emit power and ground pins */
CNLFP (_lfp, "pg_pin(GND) {\n");
_l->_tab();
CNLFP (_lfp, "pg_type : primary_ground;\n");
CNLFP (_lfp, "voltage_name : GND;\n");
_l->_untab();
CNLFP (_lfp, "}\n");
CNLFP (_lfp, "pg_pin(Vdd) {\n");
_l->_tab();
CNLFP (_lfp, "pg_type : primary_power;\n");
CNLFP (_lfp, "voltage_name : Vdd;\n");
_l->_untab();
CNLFP (_lfp, "}\n");
}
void Cell::_printFooter ()
{
_l->_untab();
CNLFP (_lfp, "}\n");
}
void Cell::_add_support_var (ActId *id)
{
act_connection *c;
phash_bucket_t *b;
c = id->Canonical (nl->bN->cur);
for (int i=0; i < A_LEN (_sh_vars); i++) {
if (c == _sh_vars[i]->id) return;
}
A_NEW (_sh_vars, act_booleanized_var_t *);
b = phash_lookup (nl->bN->cH, c);
Assert (b, "What?!");
A_NEXT (_sh_vars) = (act_booleanized_var_t *)b->v;
Assert (A_NEXT(_sh_vars)->id == c, "What?!");
A_INC (_sh_vars);
}
void Cell::_collect_support (act_prs_expr_t *e)
{
if (!e) return;
switch (e->type) {
case ACT_PRS_EXPR_AND:
case ACT_PRS_EXPR_OR:
_collect_support (e->u.e.l);
_collect_support (e->u.e.r);
break;
case ACT_PRS_EXPR_NOT:
_collect_support (e->u.e.l);
break;
case ACT_PRS_EXPR_LABEL:
warning ("labels within state-holding gate...");
break;
case ACT_PRS_EXPR_TRUE:
case ACT_PRS_EXPR_FALSE:
break;
case ACT_PRS_EXPR_VAR:
_add_support_var (e->u.v.id);
break;
default:
fatal_error ("Unexpected type %d", e->type);
break;
}
}
int Cell::_eval_expr (act_prs_expr_t *e, unsigned int v)
{
act_connection *c;
if (!e) return 0;
switch (e->type) {
case ACT_PRS_EXPR_AND:
if (_eval_expr (e->u.e.l, v) && _eval_expr (e->u.e.r, v)) {
return 1;
}
return 0;
break;
case ACT_PRS_EXPR_OR:
if (_eval_expr (e->u.e.l, v) || _eval_expr (e->u.e.r, v)) {
return 1;
}
return 0;
break;
case ACT_PRS_EXPR_NOT:
return 1 - _eval_expr (e->u.e.l, v);
break;
case ACT_PRS_EXPR_LABEL:
warning ("labels within state-holding gate...");
return 0;
break;
case ACT_PRS_EXPR_TRUE:
return 1;
break;
case ACT_PRS_EXPR_FALSE:
return 0;
break;
case ACT_PRS_EXPR_VAR:
c = e->u.v.id->Canonical (nl->bN->cur);
for (int i=0; i < A_LEN (_sh_vars); i++) {
if (_sh_vars[i]->id == c) {
return ((v >> i) & 1);
}
}
fatal_error ("Didn't find input variable?!");
return 0;
break;
default:
fatal_error ("Unexpected type %d", e->type);
return 0;
break;
}
}
void Cell::_build_truth_table (act_prs_expr_t *e, bitset_t *b)
{
for (unsigned int i=0; i < (1 << A_LEN (_sh_vars)); i++) {
if (_eval_expr (e, i)) {
bitset_set (b, i);
}
else {
bitset_clr (b, i);
}
}
}
Cell::~Cell()
{
if (_outvals) {
for (int i=0; i < _num_outputs; i++) {
bitset_free (_outvals[i]);
}
int x = _num_outputs;
for (int i=0; i < A_LEN (_sh_vars); i++) {
if (_sh_vars[i]->isport) continue;
bitset_free (_outvals[x]);
x++;
}
FREE (_outvals);
}
if (_num_stateholding > 0) {
for (int i=0; i < _num_stateholding; i++) {
bitset_free (_stateholding[i].tt[0]);
bitset_free (_stateholding[i].tt[1]);
if (_stateholding[i].st[0]) {
bitset_free (_stateholding[i].st[0]);
}
if (_stateholding[i].st[1]) {
bitset_free (_stateholding[i].st[1]);
}
}
FREE (_stateholding);
_stateholding = NULL;
}
A_FREE (_sh_vars);
if (_is_out) {
FREE (_is_out);
}
for (int i=0; i < A_LEN (dyn); i++) {
FREE (dyn[i].delay);
FREE (dyn[i].transit);
FREE (dyn[i].intpow);
}
A_FREE (dyn);
if (time_up) {
FREE (time_up);
}
if (time_dn) {
FREE (time_dn);
}
}
int Cell::_run_leakage ()
{
FILE *sfp;
char buf[1024];
char file[1024];
A_DECL (char *, outname);
if (!nl) return 0;
if (_is_dataflow) {
return _run_dflow_leakage ();
}
A_INIT (outname);
snprintf (file, 1024, "_splk_");
a->msnprintfproc (file + 6, 1018, _p);
snprintf (buf, 1024, "%s.spi", file);
sfp = fopen (buf, "w");
if (!sfp) {
fatal_error ("Could not open `%s' for writing", buf);
}
/* -- std header that instantiates the module -- */
if (!_gen_spice_header (sfp)) {
fclose (sfp);
unlink (buf);
return 0;
}
/* -- generate all possible static input scenarios -- */
_print_all_input_cases (sfp, "p");
fprintf (sfp, "\n");
double period = config_get_real ("xcell.period");
double vdd = config_get_real ("xcell.Vdd");
/* -- measurement of current -- */
int tm = 1;
double lk_window = config_get_real ("xcell.leak_window");
if (period / (2 * lk_window) < 2) {
fatal_error ("leak_window parameter (%g) is too large for period (%g)\n",
lk_window, period);
}
for (int i=0; i < (1 << _num_inputs); i++) {
fprintf (sfp, ".measure tran current_%d avg i(Vv1) from ", i);
print_number (sfp, tm*period*1e-12);
fprintf (sfp, " to ");
print_number (sfp, ((tm+1)*period - lk_window)*1e-12);
fprintf (sfp, "\n");
fprintf (sfp, ".measure tran leak_%d PARAM='-current_%d*%g'\n", i, i,
vdd);
tm++;
}
fprintf (sfp, ".tran 0.1p ");
print_number (sfp, tm*period*1e-12);
fprintf (sfp, "\n");
if (is_hspice()) {
fprintf (sfp, ".options post post_version=9601\n");
fprintf (sfp, ".options measform=2\n");
}
fprintf (sfp, ".print tran");
if (is_xyce()) {
fprintf (sfp, " format=raw");
}
/* print voltages */
char bufout[1024];
int num_outputs;
for (int i=0; i < A_LEN (nl->bN->ports); i++) {
if (nl->bN->ports[i].omit) continue;
if (nl->bN->ports[i].input) continue;
ActId *tmp;
char buf[1024];
tmp = nl->bN->ports[i].c->toid();
tmp->sPrint (buf, 1024);
delete tmp;
fprintf (sfp, " V(xtst%s", config_get_string ("net.spice_path_sep"));
a->mfprintf (sfp, "%s", buf);
fprintf (sfp, ") ");
snprintf (bufout, 1024, "xtst.");
a->msnprintf (bufout + strlen (bufout), 1024 - strlen (bufout),
"%s", buf);
for (int i=0; bufout[i]; i++) {
bufout[i] = tolower(bufout[i]);
}
A_NEWM (outname, char *);
A_NEXT (outname) = Strdup (bufout);
A_INC (outname);
}
num_outputs = A_LEN (outname);
Assert (_num_outputs == num_outputs, "What?");
/*-- we also need internal nodes for stateholding gates --*/
for (int i=0; i < A_LEN (_sh_vars); i++) {
if (_sh_vars[i]->isport) continue;
ActId *tmp;
char buf[1024];
tmp = _sh_vars[i]->id->toid();
tmp->sPrint (buf, 1024);
delete tmp;
fprintf (sfp, " V(xtst%s", config_get_string ("net.spice_path_sep"));
a->mfprintf (sfp, "%s", buf);
fprintf (sfp, ") ");
snprintf (bufout, 1024, "xtst.");
a->msnprintf (bufout + strlen (bufout), 1024 - strlen (bufout),
"%s", buf);
for (int i=0; bufout[i]; i++) {
bufout[i] = tolower(bufout[i]);
}
A_NEWM (outname, char *);
A_NEXT (outname) = Strdup (bufout);
A_INC (outname);
}
fprintf (sfp, "\n");
fprintf (sfp, ".end\n");
fclose (sfp);
/* -- run the spice simulation -- */
snprintf (buf, 1024, "%s %s.spi > %s.log 2>&1",
config_get_string ("xcell.spice_binary"),
file, file);
system (buf);
/* -- extract results from spice run -- */
/* -- convert trace file to atrace format -- */
if (config_get_int ("xcell.spice_output_fmt") == 0) {
/* raw */
snprintf (buf, 1024, "tr2alint -r %s.spi.raw %s", file, file);
}
else {
snprintf (buf, 1024, "tr2alint %s.tr0 %s", file, file);
}
system (buf);
/*
Step 1: truth tables
*/
atrace *tr = atrace_open (file);
if (!tr) {
fatal_error ("Could not open simulation trace file!");
}
name_t *timenode;
A_DECL (name_t *, outnode);
A_INIT (outnode);
snprintf (buf, 1024, "time");
timenode = atrace_lookup (tr, buf);
if (!timenode) {
printf ("Time not found?\n");
}
for (int i=0; i < A_LEN (outname); i++) {
A_NEWM (outnode, name_t *);
A_NEXT (outnode) = atrace_lookup (tr, outname[i]);
if (!A_NEXT (outnode)) {
if (i < num_outputs) {
snprintf (buf, 1024, "p%d", i + _num_inputs);
A_NEXT (outnode) = atrace_lookup (tr, buf);
}
if (!A_NEXT (outnode)) {
printf ("Output node `%s' not found", outname[i]);
}
else {
A_INC (outnode);
}
}
else {
A_INC (outnode);
}
}
for (int i=0; i < A_LEN (outname); i++) {
FREE (outname[i]);
}
if (A_LEN (outnode) != A_LEN (outname) || !timenode) {
A_FREE (outnode);
A_FREE (outname);
atrace_close (tr);
A_FREE (_sh_vars);
return 0;
}
A_FREE (outname);
int nnodes, nsteps, fmt, ts;
if (atrace_header (tr, &ts, &nnodes, &nsteps, &fmt)) {
fatal_error ("Trace file header corrupted?");
}
//printf ("%d nodes, %d steps\n", nnodes, nsteps);
/* -- get values -- */
tm = 1;
atrace_init_time (tr);
atrace_advance_time (tr, period*1e-12/ATRACE_GET_STEPSIZE (tr));
float vhigh, vlow;
vhigh = config_get_real ("lint.V_high");
vlow = config_get_real ("lint.V_low");
MALLOC (_outvals, bitset_t *, A_LEN (outnode));
for (int i=0; i < A_LEN (outnode); i++) {
_outvals[i] = bitset_new (1 << _num_inputs);
}
for (int i=0; i < (1 << _num_inputs); i++) {
float val;
atrace_advance_time (tr, (period-1000)*1e-12/ATRACE_GET_STEPSIZE (tr));
for (int j=0; j < A_LEN (outnode); j++) {
val = ATRACE_NODE_FLOATVAL (outnode[j]);
if (val >= vhigh) {
bitset_set (_outvals[j], i);
//printf ("out[%d]: H @ %g\n", j, ATRACE_NODE_FLOATVAL (timenode));
}
else if (val <= vlow) {
bitset_clr (_outvals[j], i);
//printf ("out[%d]: L @ %g\n", j, ATRACE_NODE_FLOATVAL (timenode));
}
else {
if (j >= num_outputs) {
warning ("%s: out[%d]: X (%g) @ %g\n", _p->getName(), j, val, ATRACE_NODE_FLOATVAL (timenode));
}
}
}
atrace_advance_time (tr, 1000e-12/ATRACE_GET_STEPSIZE (tr));
}
atrace_close (tr);
/*
Step 2: leakage measurements
*/
snprintf (buf, 1024, "%s.spi.mt0", file);
struct Hashtable *H = parse_measurements (buf);
if (!H) {
snprintf (buf, 1024, "%s.mt0", file);
H = parse_measurements (buf);
if (!H) {
fatal_error ("Could not open measurement output file %s.\n", buf);
}
}
MALLOC (leakage_power, double, (1 << _num_inputs));
for (int i=0; i < (1 << _num_inputs); i++) {
leakage_power[i] = 0;
}
hash_iter_t hi;
hash_bucket_t *b;
hash_iter_init (H, &hi);
while ((b = hash_iter_next (H, &hi))) {
int i;
double lk;
if (strncasecmp (b->key, "leak_", 5) == 0) {
if (sscanf (b->key + 5, "%d", &i) != 1) {
fatal_error ("Unknown measurement `%s'", b->key);
}
lk = b->f;
if (lk < 0) {
warning ("%s: unusual measurement for leakage, scenario %d (%g)",
_p->getName(), i, lk);
lk = -lk;
}
leakage_power[i] = lk;
}
}
hash_free (H);
unlink_generic_trace (file);
A_FREE (outnode);
return 1;
}
int Cell::_gen_spice_header (FILE *fp)
{
A_DECL (int, xout);
A_INIT (xout);
fprintf (fp, "**************************\n");
fprintf (fp, "** characterization run **\n");
fprintf (fp, "**************************\n");
/*-- XXX: power and ground are actually in the netlist --*/
if (config_exists ("xcell.tech_setup")) {
fprintf (fp, ".include '%s'\n\n", config_get_string ("xcell.tech_setup"));
}
else if (getenv ("ACT_HOME") && getenv ("ACT_TECH")) {
fprintf (fp, ".include '%s/conf/%s/models.sp'\n\n", getenv ("ACT_HOME"),
getenv ("ACT_TECH"));
}
else {
fatal_error ("No technology/model information? Use xcell.tech_setup.");
}
fprintf (fp, ".global Vdd\n");
fprintf (fp, ".global GND\n");
if (is_xyce()) {
fprintf (fp, ".global_param load = 2.2f\n");
}
else {
fprintf (fp, ".param load = 2.2f\n");
}
fprintf (fp, ".param resistor = %g%s\n\n",
config_get_real ("xcell.R_value"),
config_get_string ("xcell.units.resis"));
if (is_xyce()) {
fprintf (fp, ".options DEVICE TNOM=%g\n", config_get_real ("xcell.T") - 273.15);
}
else {
fprintf (fp, ".options TNOM=%g\n", config_get_real ("xcell.T") - 273);
}
/*-- dump subcircuit --*/
/* see if a spice file is specified here */
const char *cprefix = _cellinfo (_p);
char buf[1024];
snprintf (buf, 1024, "%s.spice", cprefix);
if (config_exists (buf)) {
int sz;
FILE *xfp = fopen (config_get_string (buf), "r");
if (!xfp) {
fatal_error ("SPICE netlist `%s' not found", config_get_string (buf));
}
fprintf (fp, "\n*---- begin import from %s\n\n", buf);
while ((sz = fread (buf, 1, 1024, xfp)) > 0) {
fwrite (buf, 1, sz, fp);
}
fclose (xfp);
fprintf (fp, "\n*---- end import ----\n");
}
else {
/* auto-generate from ACT */
np->Print (fp, _p);
}
/*-- instantiate circuit --*/
fprintf (fp, "\n\n");
fprintf (fp, "xtst ");
for (int i=0; i < A_LEN (nl->bN->ports); i++) {
if (nl->bN->ports[i].omit) continue;
if (!nl->bN->ports[i].input) {
A_NEWM (xout, int);
A_NEXT (xout) = i;
A_INC (xout);
}
fprintf (fp, "p%d ", i);
}
a->mfprintfproc (fp, _p);
fprintf (fp, "\n");
if (A_LEN (xout) == 0) {
warning ("Cell %s: no outputs?\n", _p->getName());
return 0;
}
/*-- power supplies --*/
fprintf (fp, "Vv0 GND 0 0.0\n");
fprintf (fp, "Vv1 Vdd 0 %g\n", config_get_real ("xcell.Vdd"));
/*-- load cap on output that is swept --*/
for (int i=0; i < A_LEN (xout); i++) {
fprintf (fp, "Clc%d p%d GND load\n\n", i, xout[i]);