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, 8 insertions, 3 deletions

diff --git a/gcc/tree-dfa.c b/gcc/tree-dfa.c
index 9e9ee32..0273406 100644
--- a/gcc/tree-dfa.c
+++ b/gcc/tree-dfa.c
@@ -562,8 +562,11 @@ dump_variable (FILE *file, tree var)
   if (ann->is_alias_tag)
     fprintf (file, ", is an alias tag");
 
-  if (needs_to_live_in_memory (var))
-    fprintf (file, ", is %s", TREE_STATIC (var) ? "static" : "global");
+  if (TREE_ADDRESSABLE (var))
+    fprintf (file, ", is addressable");
+  
+  if (is_global_var (var))
+    fprintf (file, ", is global");
 
   if (is_call_clobbered (var))
     fprintf (file, ", call clobbered");
@@ -900,7 +903,9 @@ add_referenced_var (tree var, struct walk_state *walk_state)
       v_ann->uid = num_referenced_vars;
       VARRAY_PUSH_TREE (referenced_vars, var);
 
-      /* Global and static variables are call-clobbered, always.  */
+      /* Initially assume that all memory variables are
+	 call-clobbered.  This will be refined later by the alias
+	 analyzer.  */
       if (needs_to_live_in_memory (var))
 	mark_call_clobbered (var);