Mercurial > hg > CbC > CbC_gcc
comparison gcc/ada/libgnat/s-arit64.ads @ 111:04ced10e8804
gcc 7
| author | kono |
|---|---|
| date | Fri, 27 Oct 2017 22:46:09 +0900 |
| parents | |
| children | 84e7813d76e9 |
comparison
equal
deleted
inserted
replaced
| 68:561a7518be6b | 111:04ced10e8804 |
|---|---|
| 1 ------------------------------------------------------------------------------ | |
| 2 -- -- | |
| 3 -- GNAT COMPILER COMPONENTS -- | |
| 4 -- -- | |
| 5 -- S Y S T E M . A R I T H _ 6 4 -- | |
| 6 -- -- | |
| 7 -- S p e c -- | |
| 8 -- -- | |
| 9 -- Copyright (C) 1992-2017, Free Software Foundation, Inc. -- | |
| 10 -- -- | |
| 11 -- GNAT is free software; you can redistribute it and/or modify it under -- | |
| 12 -- terms of the GNU General Public License as published by the Free Soft- -- | |
| 13 -- ware Foundation; either version 3, or (at your option) any later ver- -- | |
| 14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- | |
| 15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- | |
| 16 -- or FITNESS FOR A PARTICULAR PURPOSE. -- | |
| 17 -- -- | |
| 18 -- As a special exception under Section 7 of GPL version 3, you are granted -- | |
| 19 -- additional permissions described in the GCC Runtime Library Exception, -- | |
| 20 -- version 3.1, as published by the Free Software Foundation. -- | |
| 21 -- -- | |
| 22 -- You should have received a copy of the GNU General Public License and -- | |
| 23 -- a copy of the GCC Runtime Library Exception along with this program; -- | |
| 24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- | |
| 25 -- <http://www.gnu.org/licenses/>. -- | |
| 26 -- -- | |
| 27 -- GNAT was originally developed by the GNAT team at New York University. -- | |
| 28 -- Extensive contributions were provided by Ada Core Technologies Inc. -- | |
| 29 -- -- | |
| 30 ------------------------------------------------------------------------------ | |
| 31 | |
| 32 -- This unit provides software routines for doing arithmetic on 64-bit | |
| 33 -- signed integer values in cases where either overflow checking is | |
| 34 -- required, or intermediate results are longer than 64 bits. | |
| 35 | |
| 36 pragma Restrictions (No_Elaboration_Code); | |
| 37 -- Allow direct call from gigi generated code | |
| 38 | |
| 39 with Interfaces; | |
| 40 | |
| 41 package System.Arith_64 is | |
| 42 pragma Pure; | |
| 43 | |
| 44 subtype Int64 is Interfaces.Integer_64; | |
| 45 | |
| 46 function Add_With_Ovflo_Check (X, Y : Int64) return Int64; | |
| 47 -- Raises Constraint_Error if sum of operands overflows 64 bits, | |
| 48 -- otherwise returns the 64-bit signed integer sum. | |
| 49 | |
| 50 function Subtract_With_Ovflo_Check (X, Y : Int64) return Int64; | |
| 51 -- Raises Constraint_Error if difference of operands overflows 64 | |
| 52 -- bits, otherwise returns the 64-bit signed integer difference. | |
| 53 | |
| 54 function Multiply_With_Ovflo_Check (X, Y : Int64) return Int64; | |
| 55 pragma Export (C, Multiply_With_Ovflo_Check, "__gnat_mulv64"); | |
| 56 -- Raises Constraint_Error if product of operands overflows 64 | |
| 57 -- bits, otherwise returns the 64-bit signed integer product. | |
| 58 -- GIGI may also call this routine directly. | |
| 59 | |
| 60 procedure Scaled_Divide | |
| 61 (X, Y, Z : Int64; | |
| 62 Q, R : out Int64; | |
| 63 Round : Boolean); | |
| 64 -- Performs the division of (X * Y) / Z, storing the quotient in Q | |
| 65 -- and the remainder in R. Constraint_Error is raised if Z is zero, | |
| 66 -- or if the quotient does not fit in 64-bits. Round indicates if | |
| 67 -- the result should be rounded. If Round is False, then Q, R are | |
| 68 -- the normal quotient and remainder from a truncating division. | |
| 69 -- If Round is True, then Q is the rounded quotient. The remainder | |
| 70 -- R is not affected by the setting of the Round flag. | |
| 71 | |
| 72 procedure Double_Divide | |
| 73 (X, Y, Z : Int64; | |
| 74 Q, R : out Int64; | |
| 75 Round : Boolean); | |
| 76 -- Performs the division X / (Y * Z), storing the quotient in Q and | |
| 77 -- the remainder in R. Constraint_Error is raised if Y or Z is zero, | |
| 78 -- or if the quotient does not fit in 64-bits. Round indicates if the | |
| 79 -- result should be rounded. If Round is False, then Q, R are the normal | |
| 80 -- quotient and remainder from a truncating division. If Round is True, | |
| 81 -- then Q is the rounded quotient. The remainder R is not affected by the | |
| 82 -- setting of the Round flag. | |
| 83 | |
| 84 end System.Arith_64; |