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+------------------------------------------------------------------------------
+-- --
+-- GNAT COMPILER COMPONENTS --
+-- --
+-- S Y S T E M . A R I T H _ 6 4 --
+-- --
+-- S p e c --
+-- --
+-- Copyright (C) 1992-2009, 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 unit provides software routines for doing arithmetic on 64-bit
+-- signed integer values in cases where either overflow checking is
+-- required, or intermediate results are longer than 64 bits.
+
+with Interfaces;
+
+package System.Arith_64 is
+ pragma Pure;
+
+ subtype Int64 is Interfaces.Integer_64;
+
+ function Add_With_Ovflo_Check (X, Y : Int64) return Int64;
+ -- Raises Constraint_Error if sum of operands overflows 64 bits,
+ -- otherwise returns the 64-bit signed integer sum.
+
+ function Subtract_With_Ovflo_Check (X, Y : Int64) return Int64;
+ -- Raises Constraint_Error if difference of operands overflows 64
+ -- bits, otherwise returns the 64-bit signed integer difference.
+
+ function Multiply_With_Ovflo_Check (X, Y : Int64) return Int64;
+ -- Raises Constraint_Error if product of operands overflows 64
+ -- bits, otherwise returns the 64-bit signed integer product.
+
+ procedure Scaled_Divide
+ (X, Y, Z : Int64;
+ Q, R : out Int64;
+ Round : Boolean);
+ -- Performs the division of (X * Y) / Z, storing the quotient in Q
+ -- and the remainder in R. Constraint_Error is raised if Z is zero,
+ -- or if the quotient does not fit in 64-bits. Round indicates if
+ -- the result should be rounded. If Round is False, then Q, R are
+ -- the normal quotient and remainder from a truncating division.
+ -- If Round is True, then Q is the rounded quotient. The remainder
+ -- R is not affected by the setting of the Round flag.
+
+ procedure Double_Divide
+ (X, Y, Z : Int64;
+ Q, R : out Int64;
+ Round : Boolean);
+ -- Performs the division X / (Y * Z), storing the quotient in Q and
+ -- the remainder in R. Constraint_Error is raised if Y or Z is zero,
+ -- or if the quotient does not fit in 64-bits. Round indicates if the
+ -- result should be rounded. If Round is False, then Q, R are the normal
+ -- quotient and remainder from a truncating division. If Round is True,
+ -- then Q is the rounded quotient. The remainder R is not affected by the
+ -- setting of the Round flag.
+
+end System.Arith_64;