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+------------------------------------------------------------------------------
+-- --
+-- GNAT COMPILER COMPONENTS --
+-- --
+-- E V A L _ F A T --
+-- --
+-- S p e c --
+-- --
+-- Copyright (C) 1992-2007, 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. See the GNU General Public License --
+-- for more details. You should have received a copy of the GNU General --
+-- Public License distributed with GNAT; see file COPYING3. If not, go to --
+-- http://www.gnu.org/licenses for a complete copy of the license. --
+-- --
+-- GNAT was originally developed by the GNAT team at New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc. --
+-- --
+------------------------------------------------------------------------------
+
+-- This package provides for compile-time evaluation of static calls to the
+-- floating-point attribute functions. It is the compile-time equivalent of
+-- the System.Fat_Gen runtime package. The coding is quite similar, as are
+-- the subprogram specs, except that the type is passed as an explicit
+-- first parameter (and used via ttypes, to obtain the necessary information
+-- about the characteristics of the type for computing the results.
+
+with Types; use Types;
+with Uintp; use Uintp;
+with Urealp; use Urealp;
+
+package Eval_Fat is
+
+ subtype UI is Uint;
+ -- The compile time representation of universal integer
+
+ subtype T is Ureal;
+ -- The compile time representation of floating-point values
+
+ subtype R is Entity_Id;
+ -- The compile time representation of the floating-point root type
+
+ -- The following functions perform the operation implied by their name
+ -- which corresponds to the name of the attribute which they compute.
+ -- The arguments correspond to the attribute function arguments.
+
+ function Adjacent (RT : R; X, Towards : T) return T;
+
+ function Ceiling (RT : R; X : T) return T;
+
+ function Compose (RT : R; Fraction : T; Exponent : UI) return T;
+
+ function Copy_Sign (RT : R; Value, Sign : T) return T;
+
+ function Exponent (RT : R; X : T) return UI;
+
+ function Floor (RT : R; X : T) return T;
+
+ function Fraction (RT : R; X : T) return T;
+
+ function Leading_Part (RT : R; X : T; Radix_Digits : UI) return T;
+
+ function Machine_Mantissa (RT : R) return Nat;
+
+ function Machine_Radix (RT : R) return Nat;
+
+ function Model (RT : R; X : T) return T;
+
+ function Pred (RT : R; X : T) return T;
+
+ function Remainder (RT : R; X, Y : T) return T;
+
+ function Rounding (RT : R; X : T) return T;
+
+ function Scaling (RT : R; X : T; Adjustment : UI) return T;
+
+ function Succ (RT : R; X : T) return T;
+
+ function Truncation (RT : R; X : T) return T;
+
+ function Unbiased_Rounding (RT : R; X : T) return T;
+
+ -- The following global declarations are used by the Machine attribute
+
+ type Rounding_Mode is (Floor, Ceiling, Round, Round_Even);
+ for Rounding_Mode use (0, 1, 2, 3);
+ -- Used to indicate rounding mode for Machine attribute
+ -- Note that C code in gigi knows that Round_Even is 3
+
+ -- The Machine attribute is special, in that it takes an extra argument
+ -- indicating the rounding mode, and also an argument Enode that is a
+ -- node used to post warnings (e.g. if asked to convert a negative zero
+ -- on a machine for which Signed_Zeros is False).
+
+ function Machine
+ (RT : R;
+ X : T;
+ Mode : Rounding_Mode;
+ Enode : Node_Id) return T;
+
+end Eval_Fat;