| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT RUN-TIME COMPONENTS -- |
| -- -- |
| -- S Y S T E M . E X P O N U -- |
| -- -- |
| -- S p e c -- |
| -- -- |
| -- Copyright (C) 1992-2025, 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 function implements unsigned integer exponentiation |
| |
| generic |
| type Int is mod <>; |
| |
| function System.Exponu (Left : Int; Right : Natural) return Int; |
| -- Calculate ``Left`` ** ``Right``. If ``Left`` is 0 then 0 is returned |
| -- and if ``Right`` is 0 then 1 is returned. In all other cases the result |
| -- is set to 1 and then computed in a loop as follows: |
| -- If ``Right`` is a multiple of 2 then multiply the result with ``Left``. |
| -- Divide ``Right`` by 2. |
| -- If ``Right is 0, return. |
| -- Multiply ``Left`` with itself. |
