lto-cgraph.c (lto_output_varpool_node): Always output constant pool references.

	* lto-cgraph.c (lto_output_varpool_node): Always output constant pool
	references.

	* lto.c: Do not attempt to make constant pool references global.

From-SVN: r158938

gcc/ChangeLog

 2010-04-30  Jan Hubicka  <jh@suse.cz>
 
+	* lto-cgraph.c (lto_output_varpool_node): Always output constant pool
+	references.
+
+2010-04-30  Jan Hubicka  <jh@suse.cz>
+
 	* tree-profile.c (tree_init_ic_make_global_vars): Mark new decls as
 	needed.
 

gcc/lto-cgraph.c

@@ -374,10 +374,21 @@ lto_output_varpool_node (struct lto_simple_output_block *ob, struct varpool_node
   gcc_assert (node->finalized || !node->analyzed);
   gcc_assert (node->needed);
   gcc_assert (!node->alias);
-  /* FIXME: We have no idea how we move references around.  For moment assume that
-     everything is used externally.  */
-  bp_pack_value (bp, flag_wpa, 1);  /* used_from_other_parition.  */
-  bp_pack_value (bp, boundary_p, 1);  /* in_other_partition.  */
+  /* Constant pool initializers can be de-unified into individual ltrans units.
+     FIXME: Alternatively at -Os we may want to avoid generating for them the local
+     labels and share them across LTRANS partitions.  */
+  if (DECL_IN_CONSTANT_POOL (node->decl))
+    {
+      bp_pack_value (bp, 0, 1);  /* used_from_other_parition.  */
+      bp_pack_value (bp, 0, 1);  /* in_other_partition.  */
+    }
+  else
+    {
+      /* FIXME: We have no idea how we move references around.  For moment assume that
+	 everything is used externally.  */
+      bp_pack_value (bp, flag_wpa, 1);  /* used_from_other_parition.  */
+      bp_pack_value (bp, boundary_p, 1);  /* in_other_partition.  */
+    }
   /* Also emit any extra name aliases.  */
   for (alias = node->extra_name; alias; alias = alias->next)
     count++;

gcc/lto/ChangeLog

+2010-04-30  Jan Hubicka  <jh@suse.cz>
+
+	* lto.c: Do not attempt to make constant pool references global.
+
 2010-04-28  Jan Hubicka  <jh@suse.cz>
 
 	* lto/lto.c (lto_read_in_decl_state): Use GGC.

gcc/lto/lto.c

@@ -723,9 +723,13 @@ lto_promote_cross_file_statics (void)
   gcc_assert (flag_wpa);
 
   /* At moment we make no attempt to figure out who is refering the variables,
-     so all must become global.  */
+     so all must become global.  
+
+     Constant pool references use internal labels and thus can not be made global.
+     It is sensible to keep those ltrans local to allow better optimization.  */
   for (vnode = varpool_nodes; vnode; vnode = vnode->next)
-    if (!vnode->externally_visible && vnode->analyzed)
+    if (!vnode->externally_visible && vnode->analyzed
+	&& !DECL_IN_CONSTANT_POOL (vnode->decl))
        {
 	  TREE_PUBLIC (vnode->decl) = 1;
 	  DECL_VISIBILITY (vnode->decl) = VISIBILITY_HIDDEN;