speedup for is_guarded(), which is more important with new combat code.

src/common/kernel/eressea.c

@@ -2494,6 +2494,7 @@ setguard(unit * u, unsigned int flags)
     return;
   }
   fset(u, UFL_GUARD);
+  fset(u->region, RF_GUARDED);
   if (!a) a = a_add(&u->attribs, a_new(&at_guard));
   a->data.i = (int)flags;
 }

src/common/kernel/movement.c

@@ -867,9 +867,22 @@ unit *
 is_guarded(region * r, unit * u, unsigned int mask)
 {
   unit *u2;
+  static unit * guardcache;
 
-  for (u2 = r->units; u2; u2 = u2->next)
-    if (is_guardian(u2, u, mask)) return u2;
+  if (!fval(r, RF_GUARDED)) {
+    return NULL;
+  }
+  if (guardcache && guardcache->region==r) {
+    if (is_guardian(guardcache, u, mask)) {
+      return guardcache;
+    }
+  }
+  for (u2 = r->units; u2; u2 = u2->next) {
+    if (is_guardian(u2, u, mask)) {
+      guardcache = u2;
+      return u2;
+    }
+  }
   return NULL;
 }
 

src/common/kernel/region.h

@@ -50,6 +50,7 @@ extern "C" {
 
 /* flags that speed up attribute access: */
 #define RF_TRAVELUNIT    (1<<19)
+#define RF_GUARDED       (1<<20)
 
 #define RF_ALL 0xFFFFFF
 

src/common/kernel/save.c

@@ -1053,6 +1053,7 @@ readunit(FILE * F)
     u->flags = ri(F) & ~UFL_DEBUG;
     u->flags &= UFL_SAVEMASK;
   }
+  if (u->flags&UFL_GUARD) fset(u->region, UFL_GUARD);
   /* Persistente Befehle einlesen */
   free_orders(&u->orders);
   freadstr(F, buf, sizeof(buf));

src/eressea/korrektur.c

@@ -892,6 +892,7 @@ fix_attribflags(void)
       while (a) {
         if (a->type==&at_guard) {
           fset(u, UFL_GUARD);
+          fset(u->region, RF_GUARDED);
         }
         else if (a->type==&at_group) {
           fset(u, UFL_GROUP);