+static inline int route2midarch(const int *ports, int nports) {
+ int archs[nports], last_arch=-1, narchs=0, i;
+ for (i=0; i<nports; i++) {
+ int arch= isle2arch(ports[i]);
+ if (arch==last_arch) continue;
+ archs[narchs++]= last_arch= arch;
+ }
+ return archs[narchs/2];
+}
+