df-problems.c (df_note_bb_compute): Pass uses rather than defs to df_set_dead_notes_for_mw.

gcc/
	* df-problems.c (df_note_bb_compute): Pass uses rather than defs
	to df_set_dead_notes_for_mw.

From-SVN: r178109

gcc/ChangeLog

+2011-08-26  Richard Sandiford  <richard.sandiford@linaro.org>
+
+	* df-problems.c (df_note_bb_compute): Pass uses rather than defs
+	to df_set_dead_notes_for_mw.
+
 2011-08-26  Richard Guenther  <rguenther@suse.de>
 
 	* varasm.c (decode_addr_const): Handle MEM_REF[&X, OFF].

gcc/df-problems.c

@@ -3376,7 +3376,7 @@ df_note_bb_compute (unsigned int bb_index,
       while (*mws_rec)
 	{
 	  struct df_mw_hardreg *mws = *mws_rec;
-	  if ((DF_MWS_REG_DEF_P (mws))
+	  if (DF_MWS_REG_USE_P (mws)
 	      && !df_ignore_stack_reg (mws->start_regno))
 	    {
 	      bool really_add_notes = debug_insn != 0;