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Text File
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1996-09-28
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4KB
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78 lines
------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- S Y S T E M . F A T _ G E N --
-- --
-- S p e c --
-- --
-- $Revision: 1.3 $ --
-- --
-- This specification comes from the Generic Primitive Functions standard. --
-- In accordance with the copyright of that document, you can freely copy --
-- and modify this specification, provided that if you do redistribute it, --
-- then any changes that you have made must be clearly indicated. --
-- --
------------------------------------------------------------------------------
-- 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
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 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;
private
pragma Inline (Machine);
pragma Inline (Model);
end System.Fat_Gen;