* lto-symtab.c (lto_symtab_merge_symbols): Add comments; merge

	duplicated nodes for assembler names.
	* symtab.c (symtab_unregister_node): Do not attempt to unlink
	hard registers from assembler name hash.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@202186 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 359b9d8..4c9554a 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,12 @@
 2013-09-02  Jan Hubicka  <jh@suse.cz>
 
+       * lto-symtab.c (lto_symtab_merge_symbols): Add comments; merge
+       duplicated nodes for assembler names.
+       * symtab.c (symtab_unregister_node): Do not attempt to unlink
+       hard registers from assembler name hash.
+
+2013-09-02  Jan Hubicka  <jh@suse.cz>
+
        * ipa-split.c (execute_split_functions): Split externally visible
        functions called once.
 

diff --git a/gcc/lto-symtab.c b/gcc/lto-symtab.c
index 83026ef..76e9440 100644 (file)
--- a/gcc/lto-symtab.c
+++ b/gcc/lto-symtab.c
@@ -586,6 +586,9 @@ lto_symtab_merge_symbols (void)
       FOR_EACH_SYMBOL (node)
        {
          cgraph_node *cnode, *cnode2;
+         varpool_node *vnode;
+         symtab_node node2;
+
          if (!node->symbol.analyzed && node->symbol.alias_target)
            {
              symtab_node tgt = symtab_node_for_asm (node->symbol.alias_target);
@@ -594,22 +597,37 @@ lto_symtab_merge_symbols (void)
                symtab_resolve_alias (node, tgt);
            }
          node->symbol.aux = NULL;
-         
+
          if (!(cnode = dyn_cast <cgraph_node> (node))
              || !cnode->clone_of
              || cnode->clone_of->symbol.decl != cnode->symbol.decl)
            {
+             /* Builtins are not merged via decl merging.  It is however
+                possible that tree merging unified the declaration.  We
+                do not want duplicate entries in symbol table.  */
              if (cnode && DECL_BUILT_IN (node->symbol.decl)
                  && (cnode2 = cgraph_get_node (node->symbol.decl))
                  && cnode2 != cnode)
                lto_cgraph_replace_node (cnode2, cnode);
 
+             /* The user defined assembler variables are also not unified by their
+                symbol name (since it is irrelevant), but we need to unify symbol
+                nodes if tree merging occured.  */
+             if ((vnode = dyn_cast <varpool_node> (node))
+                 && DECL_HARD_REGISTER (vnode->symbol.decl)
+                 && (node2 = symtab_get_node (vnode->symbol.decl))
+                 && node2 != node)
+               lto_varpool_replace_node (dyn_cast <varpool_node> (node2),
+                                         vnode);
+         
+
              /* Abstract functions may have duplicated cgraph nodes attached;
                 remove them.  */
              else if (cnode && DECL_ABSTRACT (cnode->symbol.decl)
                       && (cnode2 = cgraph_get_node (node->symbol.decl))
                       && cnode2 != cnode)
                cgraph_remove_node (cnode2);
+
              symtab_insert_node_to_hashtable ((symtab_node)node);
            }
        }

diff --git a/gcc/symtab.c b/gcc/symtab.c
index bfbc03b..253ba98 100644 (file)
--- a/gcc/symtab.c
+++ b/gcc/symtab.c
@@ -283,7 +283,8 @@ symtab_unregister_node (symtab_node node)
       else
        *slot = replacement_node;
     }
-  unlink_from_assembler_name_hash (node, false);
+  if (!is_a <varpool_node> (node) || !DECL_HARD_REGISTER (node->symbol.decl))
+    unlink_from_assembler_name_hash (node, false);
 }
 
 /* Return symbol table node associated with DECL, if any,