--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/ada/libgnat/s-fatgen.ads	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,118 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT COMPILER COMPONENTS                         --
+--                                                                          --
+--                       S Y S T E M . F A T _ G E N                        --
+--                                                                          --
+--                                 S p e c                                  --
+--                                                                          --
+--          Copyright (C) 1992-2017, Free Software Foundation, Inc.         --
+--                                                                          --
+-- GNAT is free software;  you can  redistribute it  and/or modify it under --
+-- terms of the  GNU General Public License as published  by the Free Soft- --
+-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
+-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
+-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
+-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
+--                                                                          --
+-- As a special exception 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/>.                                          --
+--                                                                          --
+-- GNAT was originally developed  by the GNAT team at  New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc.      --
+--                                                                          --
+------------------------------------------------------------------------------
+
+--  This generic package provides a target independent implementation of the
+--  floating-point attributes that denote functions. The implementations here
+--  are portable, but very slow. The runtime contains a set of instantiations
+--  of this package for all predefined floating-point types, and these should
+--  be replaced by efficient assembly language code where possible.
+
+generic
+    type T is digits <>;
+
+package System.Fat_Gen is
+   pragma Pure;
+
+   subtype UI is Integer;
+   --  The runtime representation of universal integer for the purposes of
+   --  this package is integer. The expander generates conversions for the
+   --  actual type used. For functions returning universal integer, there
+   --  is no problem, since the result always is in range of integer. For
+   --  input arguments, the expander has to do some special casing to deal
+   --  with the (very annoying) cases of out of range values. If we used
+   --  Long_Long_Integer to represent universal, then there would be no
+   --  problem, but the resulting inefficiency would be annoying.
+
+   function Adjacent          (X, Towards : T)              return T;
+
+   function Ceiling           (X : T)                       return T;
+
+   function Compose           (Fraction : T; Exponent : UI) return T;
+
+   function Copy_Sign         (Value, Sign : T)             return T;
+
+   function Exponent          (X : T)                       return UI;
+
+   function Floor             (X : T)                       return T;
+
+   function Fraction          (X : T)                       return T;
+
+   function Leading_Part      (X : T; Radix_Digits : UI)    return T;
+
+   function Machine           (X : T)                       return T;
+
+   function Machine_Rounding  (X : T)                       return T;
+
+   function Model             (X : T)                       return T;
+
+   function Pred              (X : T)                       return T;
+
+   function Remainder         (X, Y : T)                    return T;
+
+   function Rounding          (X : T)                       return T;
+
+   function Scaling           (X : T; Adjustment : UI)      return T;
+
+   function Succ              (X : T)                       return T;
+
+   function Truncation        (X : T)                       return T;
+
+   function Unbiased_Rounding (X : T)                       return T;
+
+   function Valid (X : not null access T) return Boolean;
+   --  This function checks if the object of type T referenced by X is valid,
+   --  and returns True/False accordingly. The parameter is passed by reference
+   --  (access) here, as the object of type T may be an abnormal value that
+   --  cannot be passed in a floating-point register, and the whole point of
+   --  'Valid is to prevent exceptions. Note that the object of type T must
+   --  have the natural alignment for type T.
+
+   type S is new String (1 .. T'Size / Character'Size);
+   type P is access all S with Storage_Size => 0;
+   --  Buffer and access types used to initialize temporaries for validity
+   --  checks, if the value to be checked has reverse scalar storage order, or
+   --  is not known to be properly aligned (for example it appears in a packed
+   --  record). In this case, we cannot call Valid since Valid assumes proper
+   --  full alignment. Instead, we copy the value to a temporary location using
+   --  type S (we cannot simply do a copy of a T value, because the value might
+   --  be invalid, in which case it might not be possible to copy it through a
+   --  floating point register).
+
+private
+   pragma Inline (Machine);
+   pragma Inline (Model);
+
+   --  Note: previously the validity checking subprograms (Unaligned_Valid and
+   --  Valid) were also inlined, but this was changed since there were some
+   --  problems with this inlining in optimized mode, and in any case it seems
+   --  better to avoid this inlining (space and robustness considerations).
+
+end System.Fat_Gen;