From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- gcc/ada/g-mbdira.ads | 123 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 123 insertions(+) create mode 100644 gcc/ada/g-mbdira.ads (limited to 'gcc/ada/g-mbdira.ads') diff --git a/gcc/ada/g-mbdira.ads b/gcc/ada/g-mbdira.ads new file mode 100644 index 000000000..c415a24cf --- /dev/null +++ b/gcc/ada/g-mbdira.ads @@ -0,0 +1,123 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT RUN-TIME COMPONENTS -- +-- -- +-- G N A T . M B B S _ D I S C R E T E _ R A N D O M -- +-- -- +-- S p e c -- +-- -- +-- Copyright (C) 1992-2010, Free Software Foundation, Inc. -- +-- -- +-- This specification is derived from the Ada Reference Manual for use with -- +-- GNAT. The copyright notice above, and the license provisions that follow -- +-- apply solely to the contents of the part following the private keyword. -- +-- -- +-- 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 -- +-- . -- +-- -- +-- GNAT was originally developed by the GNAT team at New York University. -- +-- Extensive contributions were provided by Ada Core Technologies Inc. -- +-- -- +------------------------------------------------------------------------------ + +-- The implementation used in this package was contributed by Robert +-- Eachus. It is based on the work of L. Blum, M. Blum, and M. Shub, SIAM +-- Journal of Computing, Vol 15. No 2, May 1986. The particular choices for P +-- and Q chosen here guarantee a period of 562,085,314,430,582 (about 2**49), +-- and the generated sequence has excellent randomness properties. For further +-- details, see the paper "Fast Generation of Trustworthy Random Numbers", by +-- Robert Eachus, which describes both the algorithm and the efficient +-- implementation approach used here. + +-- Formerly, this package was Ada.Numerics.Discrete_Random. It is retained +-- here in part to allow users to reconstruct number sequences generated +-- by previous versions. + +with Interfaces; + +generic + type Result_Subtype is (<>); + +package GNAT.MBBS_Discrete_Random is + + -- The algorithm used here is reliable from a required statistical point of + -- view only up to 48 bits. We try to behave reasonably in the case of + -- larger types, but we can't guarantee the required properties. So + -- generate a warning for these (slightly) dubious cases. + + pragma Compile_Time_Warning + (Result_Subtype'Size > 48, + "statistical properties not guaranteed for size > 48"); + + -- Basic facilities + + type Generator is limited private; + + function Random (Gen : Generator) return Result_Subtype; + + procedure Reset (Gen : Generator); + procedure Reset (Gen : Generator; Initiator : Integer); + + -- Advanced facilities + + type State is private; + + procedure Save (Gen : Generator; To_State : out State); + procedure Reset (Gen : Generator; From_State : State); + + Max_Image_Width : constant := 80; + + function Image (Of_State : State) return String; + function Value (Coded_State : String) return State; + +private + subtype Int is Interfaces.Integer_32; + subtype Rst is Result_Subtype; + + -- We prefer to use 14 digits for Flt, but some targets are more limited + + type Flt is digits Positive'Min (14, Long_Long_Float'Digits); + + RstF : constant Flt := Flt (Rst'Pos (Rst'First)); + RstL : constant Flt := Flt (Rst'Pos (Rst'Last)); + + Offs : constant Flt := RstF - 0.5; + + K1 : constant := 94_833_359; + K1F : constant := 94_833_359.0; + K2 : constant := 47_416_679; + K2F : constant := 47_416_679.0; + Scal : constant Flt := (RstL - RstF + 1.0) / (K1F * K2F); + + type State is record + X1 : Int := Int (2999 ** 2); + X2 : Int := Int (1439 ** 2); + P : Int := K1; + Q : Int := K2; + FP : Flt := K1F; + Scl : Flt := Scal; + end record; + + type Writable_Access (Self : access Generator) is limited null record; + -- Auxiliary type to make Generator a self-referential type + + type Generator is limited record + Writable : Writable_Access (Generator'Access); + -- This self reference allows functions to modify Generator arguments + Gen_State : State; + end record; + +end GNAT.MBBS_Discrete_Random; -- cgit v1.2.3