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tree-dfa.c (add_referenced_var): Do not walk DECL_INITIAL for more referenced vars. 

2012-05-21  Richard Guenther  <rguenther@suse.de>

	* tree-dfa.c (add_referenced_var): Do not walk DECL_INITIAL for
	more referenced vars.
	* tree-ssa-live.c (mark_all_vars_used_1): Only set the used
	flag on variables that have a var-annotation.

From-SVN: r187719
This commit is contained in:
Richard Guenther 2012-05-21 14:53:21 +00:00 committed by Richard Biener
parent 01c7ccbb81
commit cb0c9fc305
3 changed files with 14 additions and 14 deletions
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7
gcc/ChangeLog
View File

@ -1,3 +1,10 @@
2012-05-21 Richard Guenther <rguenther@suse.de>
* tree-dfa.c (add_referenced_var): Do not walk DECL_INITIAL for
more referenced vars.
* tree-ssa-live.c (mark_all_vars_used_1): Only set the used
flag on variables that have a var-annotation.
2012-05-21 Joseph Myers <joseph@codesourcery.com>
PR c/53148

18
gcc/tree-dfa.c
View File

@ -577,24 +577,16 @@ set_default_def (tree var, tree def)
bool
add_referenced_var (tree var)
{
gcc_assert (DECL_P (var));
gcc_checking_assert (TREE_CODE (var) == VAR_DECL
|| TREE_CODE (var) == PARM_DECL
|| TREE_CODE (var) == RESULT_DECL);
if (!*DECL_VAR_ANN_PTR (var))
create_var_ann (var);
/* Insert VAR into the referenced_vars hash table if it isn't present. */
if (referenced_var_check_and_insert (var))
{
/* Scan DECL_INITIAL for pointer variables as they may contain
address arithmetic referencing the address of other
variables. As we are only interested in directly referenced
globals or referenced locals restrict this to initializers
than can refer to local variables. */
if (DECL_INITIAL (var)
&& DECL_CONTEXT (var) == current_function_decl)
walk_tree (&DECL_INITIAL (var), find_vars_r, NULL, 0);
return true;
}
return true;
return false;
}

3
gcc/tree-ssa-live.c
View File

@ -377,7 +377,8 @@ mark_all_vars_used_1 (tree *tp, int *walk_subtrees, void *data)
if (data != NULL && bitmap_clear_bit ((bitmap) data, DECL_UID (t))
&& DECL_CONTEXT (t) == current_function_decl)
mark_all_vars_used (&DECL_INITIAL (t), data);
set_is_used (t);
if (var_ann (t) != NULL)
set_is_used (t);
}
/* remove_unused_scope_block_p requires information about labels
which are not DECL_IGNORED_P to tell if they might be used in the IL. */