re PR tree-optimization/16867 (Inline array initializer miscompilation at -O)

	PR tree-optimization/16867
	* tree.c (is_global_var): New function.
	(needs_to_live_in_memory): Check for TREE_ADDRESSABLE.
	Call is_global_var.
	* tree.h (DECL_NEEDS_TO_LIVE_IN_MEMORY_INTERNAL): Remove.
	Update all users.
	(is_global_var): Declare.
	* tree-dfa.c (dump_variable): Display global and addressable
	attributes.
	(add_referenced_var): Clarify documentation when marking
	variables call-clobbered.
	* tree-flow-inline.h (is_call_clobbered): Call is_global_var
	instead of needs_to_live_in_memory.
	(mark_call_clobbered): If the variable is a tag, mark it
	DECL_EXTERNAL.
	* tree-gimple.c (is_gimple_reg): Don't check for
	TREE_ADDRESSABLE.
	(is_gimple_non_addressable): Likewise.
	* tree-ssa-alias.c (get_nmt_for): Always check whether the tag
	needs to be marked call-clobbered.
	(setup_pointers_and_addressables): Call is_global_var instead
	of needs_to_live_in_memory.
	* tree-ssa-dce.c (need_to_preserve_store): Remove.
	Update all users with is_global_var.
	(mark_stmt_if_obviously_necessary): Fix processing of aliased
	stores.  Don't check the virtual definitions.  Rather, check
	whether the store is going into global memory.
	(find_obviously_necessary_stmts): Get the symbol from the PHI
	result.
	* tree-ssa-operands.c (get_call_expr_operands): Do not add
	clobbering may-defs if the call does not have side effects.


libjava/ChangeLog

	PR tree-optimization/16867
	* testsuite/libjava.lang/PR16867.java: New test.

From-SVN: r85874

1 files changed, 10 insertions, 3 deletions

diff --git a/gcc/tree.c b/gcc/tree.c
index c8153b8..a6b17da 100644
--- a/gcc/tree.c
+++ b/gcc/tree.c
@@ -5624,15 +5624,22 @@ in_array_bounds_p (tree ref)
   return true;
 }
 
+/* Return true if T (assumed to be a DECL) is a global variable.  */
+
+bool
+is_global_var (tree t)
+{
+  return (TREE_STATIC (t) || DECL_EXTERNAL (t));
+}
+
 /* Return true if T (assumed to be a DECL) must be assigned a memory
    location.  */
 
 bool
 needs_to_live_in_memory (tree t)
 {
-  return (DECL_NEEDS_TO_LIVE_IN_MEMORY_INTERNAL (t)
-	  || TREE_STATIC (t)
-          || DECL_EXTERNAL (t)
+  return (TREE_ADDRESSABLE (t)
+	  || is_global_var (t)
 	  || (TREE_CODE (t) == RESULT_DECL
 	      && aggregate_value_p (t, current_function_decl)));
 }