df-problems.c (df_note_bb_compute): Do not take note of debug uses for whose…

df-problems.c (df_note_bb_compute): Do not take note of debug uses for whose REGs we won't emit DEAD or UNUSED notes.

* df-problems.c (df_note_bb_compute): Do not take note of
debug uses for whose REGs we won't emit DEAD or UNUSED notes.

From-SVN: r186421

gcc/ChangeLog

 2012-04-13  Alexandre Oliva  <aoliva@redhat.com>
 
+	* df-problems.c (df_note_bb_compute): Do not take note of
+	debug uses for whose REGs we won't emit DEAD or UNUSED notes.
+
+2012-04-13  Alexandre Oliva  <aoliva@redhat.com>
+
 	PR debug/51570
 	* var-tracking.c (expand_depth): New type.
 	(onepart_aux, expand_loc_callback_data): Change depth type to it.

gcc/df-problems.c

@@ -3453,6 +3453,11 @@ df_note_bb_compute (unsigned int bb_index,
 		{
 		  if (debug_insn > 0)
 		    {
+		      /* We won't add REG_UNUSED or REG_DEAD notes for
+			 these, so we don't have to mess with them in
+			 debug insns either.  */
+		      if (!bitmap_bit_p (artificial_uses, uregno)
+			  && !df_ignore_stack_reg (uregno))
 			dead_debug_add (&debug, use, uregno);
 		      continue;
 		    }