1 files changed, 13 insertions, 2 deletions
diff --git a/gcc/expr.c b/gcc/expr.c
index bb6e3f1..176978a 100644
--- a/gcc/expr.c
+++ b/gcc/expr.c
@@ -1181,8 +1181,19 @@ emit_block_move_hints (rtx x, rtx y, rtx size, enum block_op_methods method,
   else if (may_use_call
 	   && ADDR_SPACE_GENERIC_P (MEM_ADDR_SPACE (x))
 	   && ADDR_SPACE_GENERIC_P (MEM_ADDR_SPACE (y)))
-    retval = emit_block_move_via_libcall (x, y, size,
-					  method == BLOCK_OP_TAILCALL);
+    {
+      /* Since x and y are passed to a libcall, mark the corresponding
+	 tree EXPR as addressable.  */
+      tree y_expr = MEM_EXPR (y);
+      tree x_expr = MEM_EXPR (x);
+      if (y_expr)
+	mark_addressable (y_expr);
+      if (x_expr)
+	mark_addressable (x_expr);
+      retval = emit_block_move_via_libcall (x, y, size,
+					    method == BLOCK_OP_TAILCALL);
+    }
+
   else
     emit_block_move_via_loop (x, y, size, align);