re PR ipa/65087 (r220742 causes: ICE: in ipcp_verify_propagated_values, at ipa-cp.c:1057)

Fix PR ipa/65087.

	PR ipa/65087
	* ipa-icf.c (sem_item_optimizer::execute): Change function
	return value to boolean.
	(sem_item_optimizer::merge_classes): Likewise.
	(ipa_icf_driver): Return TODO_remove_functions in case there's
	a merge operation processed.
	* ipa-icf.h: Change function return value to boolean.


Co-Authored-By: Martin Jambor <mjambor@suse.cz>

From-SVN: r221133

gcc/ChangeLog

@@ -1,3 +1,14 @@
+2015-03-03  Martin Liska  <mliska@suse.cz>
+	    Martin Jambor  <mjambor@suse.cz>
+
+	PR ipa/65087
+	* ipa-icf.c (sem_item_optimizer::execute): Change function
+	return value to boolean.
+	(sem_item_optimizer::merge_classes): Likewise.
+	(ipa_icf_driver): Return TODO_remove_functions in case there's
+	a merge operation processed.
+	* ipa-icf.h: Change function return value to boolean.
+
 2015-03-02  Michael Meissner  <meissner@linux.vnet.ibm.com>
 
 	PR 65138/target

gcc/ipa-icf.c

@@ -2167,9 +2167,11 @@ sem_item_optimizer::filter_removed_items (void)
     m_items.safe_push (filtered[i]);
 }
 
-/* Optimizer entry point.  */
+/* Optimizer entry point which returns true in case it processes
+   a merge operation. True is returned if there's a merge operation
+   processed.  */
 
-void
+bool
 sem_item_optimizer::execute (void)
 {
   filter_removed_items ();
@@ -2214,10 +2216,12 @@ sem_item_optimizer::execute (void)
   process_cong_reduction ();
   dump_cong_classes ();
   verify_classes ();
-  merge_classes (prev_class_count);
+  bool merged_p = merge_classes (prev_class_count);
 
   if (dump_file && (dump_flags & TDF_DETAILS))
     symtab_node::dump_table (dump_file);
+
+  return merged_p;
 }
 
 /* Function responsible for visiting all potential functions and
@@ -2870,9 +2874,10 @@ sem_item_optimizer::dump_cong_classes (void)
 
 /* After reduction is done, we can declare all items in a group
    to be equal. PREV_CLASS_COUNT is start number of classes
-   before reduction.  */
+   before reduction. True is returned if there's a merge operation
+   processed. */
 
-void
+bool
 sem_item_optimizer::merge_classes (unsigned int prev_class_count)
 {
   unsigned int item_count = m_items.length ();
@@ -2882,6 +2887,8 @@ sem_item_optimizer::merge_classes (unsigned int prev_class_count)
   unsigned int non_singular_classes_count = 0;
   unsigned int non_singular_classes_sum = 0;
 
+  bool merged_p = false;
+
   for (hash_table<congruence_class_group_hash>::iterator it = m_classes.begin ();
        it != m_classes.end (); ++it)
     for (unsigned int i = 0; i < (*it)->classes.length (); i++)
@@ -2952,9 +2959,12 @@ sem_item_optimizer::merge_classes (unsigned int prev_class_count)
 		alias->dump_to_file (dump_file);
 	      }
 
-	    source->merge (alias);
+	    if (source->merge (alias))
+	      merged_p = true;
 	  }
       }
+
+  return merged_p;
 }
 
 /* Dump function prints all class members to a FILE with an INDENT.  */
@@ -3031,12 +3041,12 @@ ipa_icf_driver (void)
 {
   gcc_assert (optimizer);
 
-  optimizer->execute ();
+  bool merged_p = optimizer->execute ();
 
   delete optimizer;
   optimizer = NULL;
 
-  return 0;
+  return merged_p ? TODO_remove_functions : 0;
 }
 
 const pass_data pass_data_ipa_icf =

gcc/ipa-icf.h

@@ -470,8 +470,10 @@ public:
      read-only variables that can be merged.  */
   void parse_funcs_and_vars (void);
 
-  /* Optimizer entry point.  */
+  /* Optimizer entry point which returns true in case it processes
-  void execute (void);
+     a merge operation. True is returned if there's a merge operation
+     processed.  */
+  bool execute (void);
 
   /* Dump function. */
   void dump (void);
@@ -545,8 +547,9 @@ private:
 
   /* After reduction is done, we can declare all items in a group
      to be equal. PREV_CLASS_COUNT is start number of classes
-     before reduction.  */
+     before reduction. True is returned if there's a merge operation
-  void merge_classes (unsigned int prev_class_count);
+     processed.  */
+  bool merge_classes (unsigned int prev_class_count);
 
   /* Adds a newly created congruence class CLS to worklist.  */
   void worklist_push (congruence_class *cls);