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diff --git a/libgcc/config/libbid/_usi_to_dd.c b/libgcc/config/libbid/_usi_to_dd.c
new file mode 100644
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--- /dev/null
+++ b/libgcc/config/libbid/_usi_to_dd.c
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+/* Copyright (C) 2007, 2009  Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+#include "bid_conf.h"
+#include "bid_functions.h"
+#include "bid_gcc_intrinsics.h"
+
+_Decimal64
+__bid_floatunssidd (USItype x) {
+  union decimal64 res;
+
+  res.i = __bid64_from_uint32 (x);
+  return (res.d);
+}
+