Revert "Enable obtaining node info also for code models."

This reverts commit 08f4b56de5.

src/spicelib/analysis/cktsetup.c

@@ -24,10 +24,6 @@ Author: 1985 Thomas L. Quarles
 
 #ifdef XSPICE
 #include "ngspice/enh.h"
-/* XSPICE code models store their terminals in the MIF conn/port tree, not in
- * the generic GENnode() array, and report DEVpublic.terms == 0.  CKTtopologyReduce()
- * walks that tree explicitly so code-model nodes are counted. */
-#include "ngspice/mifdefs.h"
 #endif
 
 #ifdef USE_OMP
@@ -53,13 +49,9 @@ Author: 1985 Thomas L. Quarles
  *
  * Node degree is counted GENERICALLY over every device type through the
  * GENnode() terminal array, so no device family can be missed (which would
- * wrongly prune a live node).  XSPICE code models are the one exception: they
+ * wrongly prune a live node).  Only capacitors and resistors are ever removed.
- * report DEVpublic.terms == 0 and keep their node numbers in the MIF conn/port
+ * Disable with `set no_topo_reduce` in .spiceinit. It is disabled as well if
- * tree rather than in GENnode(), so they are walked separately below -- without
+ * option rshunt=xx is selected.*/
- * that, a node touched only by a code model would look floating and its passive
- * would be wrongly pruned.  Only capacitors and resistors are ever removed.
- * Disable with `set no_topo_reduce` in .spiceinit. It is disabled as well
- * if option rshunt=xx is selected.*/
 static void
 CKTtopologyReduce(CKTcircuit *ckt)
 {
@@ -89,7 +81,7 @@ CKTtopologyReduce(CKTcircuit *ckt)
 
     /* complete, type-agnostic node degree over all device terminals */
     for (i = 0; i < DEVmaxnum; i++) {
-        if (!DEVices[i] || !ckt->CKThead[i])
+        if (!DEVices[i] || !ckt->CKThead[i] || !DEVices[i]->DEVpublic.terms)
             continue;
         nterm = *(DEVices[i]->DEVpublic.terms);
         if (DEVices[i]->DEVpublic.name) {
@@ -98,49 +90,6 @@ CKTtopologyReduce(CKTcircuit *ckt)
             else if (!strcmp(DEVices[i]->DEVpublic.name, "Resistor"))
                 restype = i;
         }
-
-#ifdef XSPICE
-        /* XSPICE code models: DEVpublic.terms is 0 and GENnode() does not hold
-         * their nodes, so the generic walk below would count nothing for them.
-         * Walk the MIF conn/port tree and count every analog port's pos/neg node
-         * instead.  Event-driven (digital) and vsource-current ports leave these
-         * at 0 (calloc'd) and are skipped by the nd > 0 test.
-         *
-         * A code-model instance IS a MIFinstance, so it is identified by its
-         * instance size -- a plain compile-time integer (sizeof(MIFinstance))
-         * that is identical across the .cm modules.  A function-pointer test
-         * (DEVsetup == MIFsetup) is NOT reliable here: code models linked into
-         * separate .cm shared objects carry their own copy of MIFsetup, so the
-         * pointers differ from this translation unit's. */
-        if (DEVices[i]->DEVinstSize &&
-            *(DEVices[i]->DEVinstSize) == (int) sizeof(MIFinstance)) {
-            for (gmod = ckt->CKThead[i]; gmod; gmod = gmod->GENnextModel)
-                for (ginst = gmod->GENinstances; ginst; ginst = ginst->GENnextInstance) {
-                    MIFinstance *mif = (MIFinstance *) ginst;
-                    int c, p;
-                    for (c = 0; c < mif->num_conn; c++) {
-                        Mif_Conn_Data_t *conn = mif->conn[c];
-                        if (!conn || conn->is_null)
-                            continue;
-                        for (p = 0; p < conn->size; p++) {
-                            Mif_Port_Data_t *port = conn->port[p];
-                            int nd;
-                            if (!port || port->is_null)
-                                continue;
-                            nd = port->smp_data.pos_node;
-                            if (nd > 0 && nd <= maxnode) degree[nd]++;
-                            nd = port->smp_data.neg_node;
-                            if (nd > 0 && nd <= maxnode) degree[nd]++;
-                        }
-                    }
-                }
-            continue;   /* code model handled; skip the generic terminal walk */
-        }
-#endif
-
-        if (!DEVices[i]->DEVpublic.terms)
-            continue;
-        nterm = *(DEVices[i]->DEVpublic.terms);
         for (gmod = ckt->CKThead[i]; gmod; gmod = gmod->GENnextModel)
             for (ginst = gmod->GENinstances; ginst; ginst = ginst->GENnextInstance) {
                 int *nodes = GENnode(ginst);