+/*
+ * Performance statistics
+ */
+#ifdef PATH_FIND_STATS
+static unsigned pf_nsearch, pf_nsource, pf_nopen, pf_nclose;
+static unsigned pf_nheap_max, pf_noway;
+static double pf_sumcost;
+#define STAT_INC(v) ((void)((v)++))
+#define STAT_INCBY(v, i) ((void)((v) += i))
+#define STAT_HIMARK(v, h) ((void)((v) < (h) ? (v) = (h) : (h)))
+#else /* !PATH_FIND_STATS */
+#define STAT_INC(v) ((void)0)
+#define STAT_INCBY(v, i) ((void)0)
+#define STAT_HIMARK(v, h) ((void)0)
+#endif /* !PATH_FIND_STATS */
+