re PR rtl-optimization/57320 (Shrink-wrapping leaves unreachable blocks in the CFG)

	PR rtl-optimization/57320
	* function.c (rest_of_handle_thread_prologue_and_epilogue): Cleanup
	the CFG after thread_prologue_and_epilogue_insns.

From-SVN: r208551

gcc/ChangeLog

+2014-03-13  Steven Bosscher  <steven@gcc.gnu.org>
+
+	PR rtl-optimization/57320
+	* function.c (rest_of_handle_thread_prologue_and_epilogue): Cleanup
+	the CFG after thread_prologue_and_epilogue_insns.
+
 2014-03-13  Vladimir Makarov  <vmakarov@redhat.com>
 
 	PR rtl-optimization/57189

gcc/function.c

@@ -6991,6 +6991,10 @@ rest_of_handle_thread_prologue_and_epilogue (void)
      scheduling to operate in the epilogue.  */
   thread_prologue_and_epilogue_insns ();
 
+  /* Shrink-wrapping can result in unreachable edges in the epilogue,
+     see PR57320.  */
+  cleanup_cfg (0);
+
   /* The stack usage info is finalized during prologue expansion.  */
   if (flag_stack_usage_info)
     output_stack_usage ();