2011-08-26  Richard Sandiford  <richard.sandiford@linaro.org>

	gcc/
	Backport from mainline:

	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.

=== modified file 'gcc/df-problems.c'
--- old/gcc/df-problems.c	2011-07-07 19:10:01 +0000
+++ new/gcc/df-problems.c	2011-08-26 14:32:47 +0000
@@ -3375,7 +3375,7 @@
       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;