| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT COMPILER COMPONENTS -- |
| -- -- |
| -- S Y S T E M . B I G N U M S -- |
| -- -- |
| -- S p e c -- |
| -- -- |
| -- Copyright (C) 2012-2022, 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; |
