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netgen
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Modified the parallel combination code to treat cells as equivalently 

parallel if the same pins are no-connects.  These were previously not
treated as parallel because each no-connect has a unique node number,
and cells were only considered as parallel if all pins connected to
the same node numbers.  This avoids issues with long-running symmetry
breaking on standard cell designs due to cells like antenna taps or
any cell that is placed without connecting it up.  To do:  This
makes indistinguishable certain cases, e.g., N cells in circuit 1
with pin X open vs. N cells in circuit 2 with pin X all tied together.
This could be caught during property matching.
This commit is contained in:
Tim Edwards 2021-03-01 16:33:55 -05:00
parent c7848c9c02
commit 7ee50a3f8f
2 changed files with 36 additions and 5 deletions
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2
VERSION
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@ -1 +1 @@
1.5.168
1.5.169

39
base/netgen.c
View File

@ -3149,6 +3149,7 @@ int CombineParallel(char *model, int file)
size_t pcnt;
int i, dcnt = 0, hastag;
char *pstr, *p2str, *pptr;
int *nodecount;
struct valuelist *kv;
if ((tp = LookupCellFile(model, file)) == NULL) {
@ -3158,6 +3159,17 @@ int CombineParallel(char *model, int file)
InitializeHashTable(&devdict, OBJHASHSIZE);
/* Make one pass to count the number of times each node number is */
/* used. This list indicates which pins are no-connects, so they */
/* can be treated as equivalent for the purpose of parallelization. */
nodecount = (int *)CALLOC((tp->nodename_cache_maxnodenum + 1), sizeof(int));
for (ob = tp->cell; ob; ob = ob->next) {
if (ob->node >= 0)
if (ob->type != NODE)
nodecount[ob->node]++;
}
lob = NULL;
for (ob = tp->cell; ob; ) {
if (ob->type == FIRSTPIN) {
@ -3204,7 +3216,10 @@ int CombineParallel(char *model, int file)
pptr += pstr - (char *)2;
for (ob2 = ob; ob2 && (ob2->type > FIRSTPIN || ob2 == ob); ob2 = ob2->next) {
sprintf(pptr, "_%d", ob2->node);
if ((ob->node >= 0) && (nodecount[ob->node] == 1))
strcat(pptr, "_nc");
else
sprintf(pptr, "_%d", ob2->node);
pptr += strlen(pptr);
}
@ -3240,11 +3255,26 @@ int CombineParallel(char *model, int file)
for (ob2 = ob; ob2 && (ob2->type > FIRSTPIN || ob2 == ob);
ob2 = ob2->next) {
if (ob2 == pob1)
sprintf(pptr, "_%d", pob2->node);
{
if ((pob2->node >= 0) && (nodecount[pob2->node] == 1))
strcat(pptr, "_nc");
else
sprintf(pptr, "_%d", pob2->node);
}
else if (ob2 == pob2)
sprintf(pptr, "_%d", pob1->node);
{
if ((pob1->node >= 0) && (nodecount[pob1->node] == 1))
strcat(pptr, "_nc");
else
sprintf(pptr, "_%d", pob1->node);
}
else
sprintf(pptr, "_%d", ob2->node);
{
if ((ob2->node >= 0) && (nodecount[ob2->node] == 1))
strcat(pptr, "_nc");
else
sprintf(pptr, "_%d", ob2->node);
}
pptr += strlen(pptr);
}
HashPtrInstall(p2str, ob, &devdict);
@ -3368,6 +3398,7 @@ int CombineParallel(char *model, int file)
if (dcnt > 0) {
Fprintf(stdout, "Class %s: Merged %d devices.\n", model, dcnt);
}
FREE(nodecount);
return dcnt;
}