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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;