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diff --git a/gcc/config/pdp11/pdp11-modes.def b/gcc/config/pdp11/pdp11-modes.def
new file mode 100644
index 00000000..b91cde7d
--- /dev/null
+++ b/gcc/config/pdp11/pdp11-modes.def
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+/* Definitions of target machine for GNU compiler, for the pdp-11
+   Copyright (C) 2002, 2004, 2007 Free Software Foundation, Inc.
+   Contributed by Michael K. Gschwind (mike@vlsivie.tuwien.ac.at).
+
+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.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+/* Add any extra modes needed to represent the condition code.
+   CCFPmode is used for FPU, but should we use a separate reg? */
+
+CC_MODE (CCFP);
+RESET_FLOAT_FORMAT (SF, pdp11_f_format);
+RESET_FLOAT_FORMAT (DF, pdp11_d_format);