PR c++/25874

	* omp-low.c (expand_omp_parallel): If child_cfun->cfg, free dominators,
	post dominators and cleanup cfg before returning.

	* gcc.dg/gomp/pr25874.c: Add dg-options.
	* g++.dg/gomp/pr25874.C: Add dg-options.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@123822 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 10 insertions, 0 deletions

diff --git a/gcc/omp-low.c b/gcc/omp-low.c
index f176f9e4102..5715812c2dc 100644
--- a/gcc/omp-low.c
+++ b/gcc/omp-low.c
@@ -2409,6 +2409,7 @@ expand_omp_parallel (struct omp_region *region)
   block_stmt_iterator si;
   tree entry_stmt;
   edge e;
+  bool do_cleanup_cfg = false;
 
   entry_stmt = last_stmt (region->entry);
   child_fn = OMP_PARALLEL_FN (entry_stmt);
@@ -2444,6 +2445,7 @@ expand_omp_parallel (struct omp_region *region)
 	  exit_succ_e = single_succ_edge (exit_bb);
 	  make_edge (new_bb, exit_succ_e->dest, EDGE_FALLTHRU);
 	}
+      do_cleanup_cfg = true;
     }
   else
     {
@@ -2537,6 +2539,14 @@ expand_omp_parallel (struct omp_region *region)
 
   /* Emit a library call to launch the children threads.  */
   expand_parallel_call (region, new_bb, entry_stmt, ws_args);
+
+  if (do_cleanup_cfg)
+    {
+      /* Clean up the unreachable sub-graph we created above.  */
+      free_dominance_info (CDI_DOMINATORS);
+      free_dominance_info (CDI_POST_DOMINATORS);
+      cleanup_tree_cfg ();
+    }
 }