-------------------------------------------------------------------------------- ---- 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. ---- ---- ---- ---- ---- ---- 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.withInterfaces;packageSystem.Arith_64ispragmaPure;subtypeInt64isInterfaces.Integer_64;functionAdd_With_Ovflo_Check (X, Y : Int64)returnInt64;-- Raises Constraint_Error if sum of operands overflows 64 bits,-- otherwise returns the 64-bit signed integer sum.functionSubtract_With_Ovflo_Check (X, Y : Int64)returnInt64;-- Raises Constraint_Error if difference of operands overflows 64-- bits, otherwise returns the 64-bit signed integer difference.functionMultiply_With_Ovflo_Check (X, Y : Int64)returnInt64;-- Raises Constraint_Error if product of operands overflows 64-- bits, otherwise returns the 64-bit signed integer product.procedureScaled_Divide (X, Y, Z : Int64; Q, R :outInt64; 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.procedureDouble_Divide (X, Y, Z : Int64; Q, R :outInt64; 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.endSystem.Arith_64;