df-scan.c (df_ref_create): Don't mark BB as dirty on debug insns.

* df-scan.c (df_ref_create): Don't mark BB as dirty on debug insns.
(df_ref_remove): Likewise.

From-SVN: r154278

gcc/ChangeLog

+2009-11-18  Alexandre Oliva  <aoliva@redhat.com>
+
+	* df-scan.c (df_ref_create): Don't mark BB as dirty on debug insns.
+	(df_ref_remove): Likewise.
+
 2009-11-17  Jan Hubicka  <jh@suse.cz>
 
 	* ipa-struct-reorg.c (update_cgraph_with_malloc_call): Fix profile

gcc/df-scan.c

@@ -829,7 +829,8 @@ df_ref_create (rtx reg, rtx *loc, rtx insn,
   /* By adding the ref directly, df_insn_rescan my not find any
      differences even though the block will have changed.  So we need
      to mark the block dirty ourselves.  */  
-  df_set_bb_dirty (bb);
+  if (!DEBUG_INSN_P (DF_REF_INSN (ref)))
+    df_set_bb_dirty (bb);
 
   return ref;
 }
@@ -1027,7 +1028,8 @@ df_ref_remove (df_ref ref)
   /* By deleting the ref directly, df_insn_rescan my not find any
      differences even though the block will have changed.  So we need
      to mark the block dirty ourselves.  */  
-  df_set_bb_dirty (DF_REF_BB (ref));
+  if (!DEBUG_INSN_P (DF_REF_INSN (ref)))
+    df_set_bb_dirty (DF_REF_BB (ref));
   df_reg_chain_unlink (ref);
 }