re PR target/65697 (__atomic memory barriers not strong enough for __sync builtins)

[gcc.git] / gcc / dominance.c

diff --git a/gcc/dominance.c b/gcc/dominance.c
index b39cd79922546de341d9289826aa1e5c5e20c962..fb61596a82b549f01ca0c5d1b9eff827cd0ec0d9 100644 (file)
--- a/gcc/dominance.c
+++ b/gcc/dominance.c
@@ -484,11 +484,7 @@ link_roots (struct dom_info *di, TBB v, TBB w)
   di->path_min[s] = di->path_min[w];
   di->set_size[v] += di->set_size[w];
   if (di->set_size[v] < 2 * di->set_size[w])
-    {
-      TBB tmp = s;
-      s = di->set_child[v];
-      di->set_child[v] = tmp;
-    }
+    std::swap (di->set_child[v], s);
 
   /* Merge all subtrees.  */
   while (s)
@@ -650,7 +646,12 @@ calculate_dominance_info (enum cdi_direction dir)
   bool reverse = (dir == CDI_POST_DOMINATORS) ? true : false;
 
   if (dom_computed[dir_index] == DOM_OK)
-    return;
+    {
+#if ENABLE_CHECKING
+      verify_dominators (dir);
+#endif
+      return;
+    }
 
   timevar_push (TV_DOMINANCE);
   if (!dom_info_available_p (dir))
@@ -678,6 +679,12 @@ calculate_dominance_info (enum cdi_direction dir)
       free_dom_info (&di);
       dom_computed[dir_index] = DOM_NO_FAST_QUERY;
     }
+  else
+    {
+#if ENABLE_CHECKING
+      verify_dominators (dir);
+#endif
+    }
 
   compute_dom_fast_query (dir);