From f64fb0facb4f8f711ceff80c2e81413c6ec267d8 Mon Sep 17 00:00:00 2001
From: Marek Polacek <polacek@redhat.com>
Date: Fri, 8 Feb 2013 11:39:01 +0000
Subject: [PATCH] Add more checking of headers.

From-SVN: r195880
---
 gcc/ChangeLog | 5 +++++
 gcc/cfgloop.c | 9 +++++++++
 2 files changed, 14 insertions(+)

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 5175c841a22..9cf0e2ffeee 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2013-02-08  Marek Polacek  <polacek@redhat.com>
+
+	* cfgloop.c (verify_loop_structure): Add more checking
+	of headers.
+
 2013-02-08  Richard Biener  <rguenther@suse.de>
 
 	PR middle-end/56181
diff --git a/gcc/cfgloop.c b/gcc/cfgloop.c
index 60fc6e8c31f..3619907f727 100644
--- a/gcc/cfgloop.c
+++ b/gcc/cfgloop.c
@@ -1353,6 +1353,15 @@ verify_loop_structure (void)
 	}
     }
 
+  /* Check the headers.  */
+  FOR_EACH_BB (bb)
+    if (bb_loop_header_p (bb)
+	&& bb->loop_father->header != bb)
+      {
+	error ("loop with header %d not in loop tree", bb->index);
+	err = 1;
+      }
+
   /* Check get_loop_body.  */
   visited = sbitmap_alloc (last_basic_block);
   bitmap_clear (visited);
-- 
2.30.2