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diff --git a/libdecnumber/dpd/decimal128.h b/libdecnumber/dpd/decimal128.h
new file mode 100644
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+++ b/libdecnumber/dpd/decimal128.h
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+/* Decimal 128-bit format module header for the decNumber C Library.
+   Copyright (C) 2005, 2007, 2009 Free Software Foundation, Inc.
+   Contributed by IBM Corporation.  Author Mike Cowlishaw.
+
+   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/>.  */
+
+/* ------------------------------------------------------------------ */
+/* Decimal 128-bit format module header				      */
+/* ------------------------------------------------------------------ */
+
+#if !defined(DECIMAL128)
+  #define DECIMAL128
+  #define DEC128NAME	 "decimal128"		      /* Short name   */
+  #define DEC128FULLNAME "Decimal 128-bit Number"     /* Verbose name */
+  #define DEC128AUTHOR	 "Mike Cowlishaw"	      /* Who to blame */
+
+  /* parameters for decimal128s */
+  #define DECIMAL128_Bytes  16		/* length		      */
+  #define DECIMAL128_Pmax   34		/* maximum precision (digits) */
+  #define DECIMAL128_Emax   6144	/* maximum adjusted exponent  */
+  #define DECIMAL128_Emin  -6143	/* minimum adjusted exponent  */
+  #define DECIMAL128_Bias   6176	/* bias for the exponent      */
+  #define DECIMAL128_String 43		/* maximum string length, +1  */
+  #define DECIMAL128_EconL  12		/* exp. continuation length   */
+  /* highest biased exponent (Elimit-1)				      */
+  #define DECIMAL128_Ehigh  (DECIMAL128_Emax+DECIMAL128_Bias-DECIMAL128_Pmax+1)
+
+  /* check enough digits, if pre-defined			      */
+  #if defined(DECNUMDIGITS)
+    #if (DECNUMDIGITS<DECIMAL128_Pmax)
+      #error decimal128.h needs pre-defined DECNUMDIGITS>=34 for safe use
+    #endif
+  #endif
+
+  #ifndef DECNUMDIGITS
+    #define DECNUMDIGITS DECIMAL128_Pmax /* size if not already defined*/
+  #endif
+  #ifndef DECNUMBER
+    #include "decNumber.h"		/* context and number library */
+  #endif
+
+  /* Decimal 128-bit type, accessible by bytes			      */
+  typedef struct {
+    uint8_t bytes[DECIMAL128_Bytes]; /* decimal128: 1, 5, 12, 110 bits*/
+    } decimal128;
+
+  /* special values [top byte excluding sign bit; last two bits are   */
+  /* don't-care for Infinity on input, last bit don't-care for NaN]   */
+  #if !defined(DECIMAL_NaN)
+    #define DECIMAL_NaN	    0x7c	/* 0 11111 00 NaN	      */
+    #define DECIMAL_sNaN    0x7e	/* 0 11111 10 sNaN	      */
+    #define DECIMAL_Inf	    0x78	/* 0 11110 00 Infinity	      */
+  #endif
+
+  #include "decimal128Local.h"
+
+  /* ---------------------------------------------------------------- */
+  /* Routines							      */
+  /* ---------------------------------------------------------------- */
+
+  #include "decimal128Symbols.h"
+
+  /* String conversions						      */
+  decimal128 * decimal128FromString(decimal128 *, const char *, decContext *);
+  char * decimal128ToString(const decimal128 *, char *);
+  char * decimal128ToEngString(const decimal128 *, char *);
+
+  /* decNumber conversions					      */
+  decimal128 * decimal128FromNumber(decimal128 *, const decNumber *,
+				    decContext *);
+  decNumber * decimal128ToNumber(const decimal128 *, decNumber *);
+
+  /* Format-dependent utilities					      */
+  uint32_t    decimal128IsCanonical(const decimal128 *);
+  decimal128 * decimal128Canonical(decimal128 *, const decimal128 *);
+
+#endif