mode-switching.c (create_pre_exit): Skip blockage insn.

	* mode-switching.c (create_pre_exit): Skip blockage insn.

From-SVN: r122791

gcc/ChangeLog

+2007-03-10  Kaz Kojima  <kkojima@gcc.gnu.org>
+
+	* mode-switching.c (create_pre_exit): Skip blockage insn.
+
 2007-03-09  Diego Novillo  <dnovillo@redhat.com>
 
 	* tree-pass.h (TODO_update_smt_usage): Remove.

gcc/mode-switching.c

@@ -259,6 +259,12 @@ create_pre_exit (int n_entities, int *entity_map, const int *num_modes)
 			last_insn = return_copy;
 			continue;
 		      }
+		    if (GET_CODE (PATTERN (return_copy)) == ASM_INPUT
+			&& strcmp (XSTR (PATTERN (return_copy), 0), "") == 0)
+		      {
+			last_insn = return_copy;
+			continue;
+		      }
 		    /* If the return register is not (in its entirety)
 		       likely spilled, the return copy might be
 		       partially or completely optimized away.  */