void
save_routing(struct s_trace **best_routing,
t_ivec ** fb_opins_used_locally,
t_ivec ** saved_clb_opins_used_locally)
{
/* This routing frees any routing currently held in best routing, *
* then copies over the current routing (held in trace_head), and *
* finally sets trace_head and trace_tail to all NULLs so that the *
* connection to the saved routing is broken. This is necessary so *
* that the next iteration of the router does not free the saved *
* routing elements. Also saves any data about locally used clb_opins, *
* since this is also part of the routing. */
int inet, iblk, iclass, ipin, num_local_opins;
struct s_trace *tptr, *tempptr;
t_type_ptr type;
for(inet = 0; inet < num_nets; inet++)
{
/* Free any previously saved routing. It is no longer best. */
tptr = best_routing[inet];
while(tptr != NULL)
{
tempptr = tptr->next;
free_trace_data(tptr);
tptr = tempptr;
}
/* Save a pointer to the current routing in best_routing. */
best_routing[inet] = trace_head[inet];
/* Set the current (working) routing to NULL so the current trace *
* elements won't be reused by the memory allocator. */
trace_head[inet] = NULL;
trace_tail[inet] = NULL;
}
/* Save which OPINs are locally used. */
for(iblk = 0; iblk < num_blocks; iblk++)
{
type = block[iblk].type;
for(iclass = 0; iclass < type->num_class; iclass++)
{
num_local_opins =
fb_opins_used_locally[iblk][iclass].nelem;
for(ipin = 0; ipin < num_local_opins; ipin++)
{
saved_clb_opins_used_locally[iblk][iclass].
list[ipin] =
fb_opins_used_locally[iblk][iclass].
list[ipin];
}
}
}
}
void free_traceback (int inet) {
/* Puts the entire traceback (old routing) for this net on the free list *
* and sets the trace_head pointers etc. for the net to NULL. */
struct s_trace *tptr, *tempptr;
tptr = trace_head[inet];
while (tptr != NULL) {
tempptr = tptr->next;
free_trace_data (tptr);
tptr = tempptr;
}
trace_head[inet] = NULL;
trace_tail[inet] = NULL;
}