sh.c (sh_set_return_address): Mark store of return address with a USE.

	* gcc/config/sh/sh.c (sh_set_return_address): Mark store of
	return address with a USE.

From-SVN: r147836

gcc/ChangeLog

+2009-05-24  Kaz Kojima  <kkojima@gcc.gnu.org>
+
+	* gcc/config/sh/sh.c (sh_set_return_address): Mark store of
+	return address with a USE.
+
 2009-05-24  Richard Guenther  <rguenther@suse.de>
 
 	PR middle-end/40233

gcc/config/sh/sh.c

@@ -7055,6 +7055,8 @@ sh_set_return_address (rtx ra, rtx tmp)
 
   tmp = gen_frame_mem (Pmode, tmp);
   emit_insn (GEN_MOV (tmp, ra));
+  /* Tell this store isn't dead.  */
+  emit_use (tmp);
 }
 
 /* Clear variables at function end.  */