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.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@85874 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 17 insertions, 0 deletions

diff --git a/libjava/testsuite/libjava.lang/PR16867.java b/libjava/testsuite/libjava.lang/PR16867.java
new file mode 100644
index 00000000000..6862892304f
--- /dev/null
+++ b/libjava/testsuite/libjava.lang/PR16867.java
@@ -0,0 +1,17 @@
+/* SSA-DCE was removing the initialization of the temporary object
+   in getFoo because it wasn't realizing that the pointer was needed
+   outside of it.  */
+
+public class PR16867
+{
+  public static Object[] getFoo()
+  {
+    return new Object[] {"OK"};
+  }
+
+  public static void main(String[] args)
+  {
+    Object[] a = getFoo();
+    System.out.println(a[0]);
+  }
+}