2012-01-30 Richard Guenther <rguenther@suse.de>

	PR tree-optimization/52045
	* tree-optimize.c (execute_cleanup_cfg_post_optimizing): Update
	SSA form if cfgcleanup did anything.

	* gcc.dg/pr52045.c: New testcase.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@183722 138bc75d-0d04-0410-961f-82ee72b054a4

gcc/ChangeLog

+2012-01-30  Richard Guenther  <rguenther@suse.de>
+
+	PR tree-optimization/52045
+	* tree-optimize.c (execute_cleanup_cfg_post_optimizing): Update
+	SSA form if cfgcleanup did anything.
+
 2012-01-30  Richard Guenther  <rguenther@suse.de>
 
 	PR tree-optimization/52045

gcc/testsuite/ChangeLog

+2012-01-30  Richard Guenther  <rguenther@suse.de>
+
+	PR tree-optimization/52045
+	* gcc.dg/pr52045.c: New testcase.
+
 2012-01-30  Greta Yorsh  <Greta.Yorsh@arm.com>
 
         * gcc.target/arm/di-longlong64-sync-withldrexd.c: Accept

gcc/testsuite/gcc.dg/pr52045.c

+/* { dg-do compile } */
+/* { dg-options "-O3 -ftracer -fno-tree-ccp -fno-tree-copy-prop -fno-tree-dce" } */
+
+char *vx;
+char buf[20];
+
+void
+foo (void)
+{
+  vx = __builtin___stpcpy_chk (buf, vx ? "gh" : "e", sizeof(buf));
+}

gcc/tree-optimize.c

@@ -157,7 +157,9 @@ struct gimple_opt_pass pass_all_early_optimizations =
 static unsigned int
 execute_cleanup_cfg_post_optimizing (void)
 {
-  cleanup_tree_cfg ();
+  unsigned int todo = 0;
+  if (cleanup_tree_cfg ())
+    todo |= TODO_update_ssa;
   maybe_remove_unreachable_handlers ();
   cleanup_dead_labels ();
   group_case_labels ();
@@ -190,7 +192,7 @@ execute_cleanup_cfg_post_optimizing (void)
 	    }
 	}
     }
-  return 0;
+  return todo;
 }
 
 struct gimple_opt_pass pass_cleanup_cfg_post_optimizing =