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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- S Y S T E M . B I G N U M S --
-- --
-- S p e c --
-- --
-- Copyright (C) 2012-2024, 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 package provides arbitrary precision signed integer arithmetic for
-- use in computing intermediate values in expressions for the case where
-- pragma Overflow_Check (Eliminated) is in effect.
-- Note that we cannot use a straight instantiation of System.Generic_Bignums
-- because the rtsfind mechanism is not ready to handle instantiations.
with System.Shared_Bignums;
package System.Bignums is
pragma Preelaborate;
subtype Bignum is System.Shared_Bignums.Bignum;
function Big_Add (X, Y : Bignum) return Bignum; -- "+"
function Big_Sub (X, Y : Bignum) return Bignum; -- "-"
function Big_Mul (X, Y : Bignum) return Bignum; -- "*"
function Big_Div (X, Y : Bignum) return Bignum; -- "/"
function Big_Exp (X, Y : Bignum) return Bignum; -- "**"
function Big_Mod (X, Y : Bignum) return Bignum; -- "mod"
function Big_Rem (X, Y : Bignum) return Bignum; -- "rem"
function Big_Neg (X : Bignum) return Bignum; -- "-"
function Big_Abs (X : Bignum) return Bignum; -- "abs"
-- Perform indicated arithmetic operation on bignum values. No exception
-- raised except for Div/Mod/Rem by 0 which raises Constraint_Error with
-- an appropriate message.
function Big_EQ (X, Y : Bignum) return Boolean; -- "="
function Big_NE (X, Y : Bignum) return Boolean; -- "/="
function Big_GE (X, Y : Bignum) return Boolean; -- ">="
function Big_LE (X, Y : Bignum) return Boolean; -- "<="
function Big_GT (X, Y : Bignum) return Boolean; -- ">"
function Big_LT (X, Y : Bignum) return Boolean; -- "<"
-- Perform indicated comparison on bignums, returning result as Boolean.
-- No exception raised for any input arguments.
function Bignum_In_LLI_Range (X : Bignum) return Boolean;
-- Returns True if the Bignum value is in the range of Long_Long_Integer,
-- so that a call to From_Bignum is guaranteed not to raise an exception.
function To_Bignum (X : Long_Long_Integer) return Bignum;
-- Convert Long_Long_Integer to Bignum. No exception can be raised for any
-- input argument.
function From_Bignum (X : Bignum) return Long_Long_Integer;
-- Convert Bignum to Long_Long_Integer. Constraint_Error raised with
-- appropriate message if value is out of range of Long_Long_Integer.
private
pragma Inline (Big_Add);
pragma Inline (Big_Sub);
pragma Inline (Big_Mul);
pragma Inline (Big_Div);
pragma Inline (Big_Exp);
pragma Inline (Big_Mod);
pragma Inline (Big_Rem);
pragma Inline (Big_Neg);
pragma Inline (Big_Abs);
pragma Inline (Big_EQ);
pragma Inline (Big_NE);
pragma Inline (Big_GE);
pragma Inline (Big_LE);
pragma Inline (Big_GT);
pragma Inline (Big_LT);
pragma Inline (Bignum_In_LLI_Range);
pragma Inline (To_Bignum);
pragma Inline (From_Bignum);
end System.Bignums;
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