cse.c (cse_extended_basic_block): Invalidate artificial defs at bb start.

2008-03-06  Andreas Krebbel  <krebbel1@de.ibm.com>

	* cse.c (cse_extended_basic_block): Invalidate artificial defs
	at bb start.

From-SVN: r132968

gcc/ChangeLog

+2008-03-06  Andreas Krebbel  <krebbel1@de.ibm.com>
+
+	* cse.c (cse_extended_basic_block): Invalidate artificial defs
+	at bb start.
+
 2008-03-06  Richard Guenther  <rguenther@suse.de>
 
 	* alias.c (struct alias_set_entry): Move has_zero_child field

gcc/cse.c

@@ -5992,6 +5992,21 @@ cse_extended_basic_block (struct cse_basic_block_data *ebb_data)
       int no_conflict = 0;
 
       bb = ebb_data->path[path_entry].bb;
+
+      /* Invalidate recorded information for eh regs if there is an EH
+	 edge pointing to that bb.  */
+      if (bb_has_eh_pred (bb))
+	{
+	  struct df_ref **def_rec;
+
+	  for (def_rec = df_get_artificial_defs (bb->index); *def_rec; def_rec++)
+	    {
+	      struct df_ref *def = *def_rec;
+	      if (DF_REF_FLAGS (def) & DF_REF_AT_TOP)
+		invalidate (DF_REF_REG (def), GET_MODE (DF_REF_REG (def)));
+	    }
+	}
+
       FOR_BB_INSNS (bb, insn)
 	{
 	  /* If we have processed 1,000 insns, flush the hash table to