re PR rtl-optimization/33224 (failing rtl iv analysis (maybe due to df))

	PR rtl-optimization/33224
	* loop-iv.c (latch_dominating_def): Check that the definition belongs
	to the analysed region.

From-SVN: r127996

gcc/ChangeLog

+2007-08-31  Zdenek Dvorak  <ook@ucw.cz>
+
+	PR rtl-optimization/33224
+	* loop-iv.c (latch_dominating_def): Check that the definition belongs
+	to the analysed region.
+
 2007-08-31  Richard Guenther  <rguenther@suse.de>
 
 	* function.c (allocate_struct_function): Do not set

gcc/loop-iv.c

@@ -301,7 +301,8 @@ latch_dominating_def (rtx reg, struct df_ref **def)
 
   for (adef = DF_REG_DEF_CHAIN (regno); adef; adef = adef->next_reg)
     {
-      if (!bitmap_bit_p (bb_info->out, DF_REF_ID (adef)))
+      if (!bitmap_bit_p (df->blocks_to_analyze, DF_REF_BB (adef)->index)
+	  || !bitmap_bit_p (bb_info->out, DF_REF_ID (adef)))
 	continue;
 
       /* More than one reaching definition.  */