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Diffstat (limited to 'gcc/ada/s-mantis.adb')
| -rw-r--r-- | gcc/ada/s-mantis.adb | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/gcc/ada/s-mantis.adb b/gcc/ada/s-mantis.adb new file mode 100644 index 00000000000..ff9cb8b9e7d --- /dev/null +++ b/gcc/ada/s-mantis.adb @@ -0,0 +1,57 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT RUNTIME COMPONENTS -- +-- -- +-- S Y S T E M . M A N T I S S A -- +-- -- +-- B o d y -- +-- -- +-- $Revision: 1.2 $ -- +-- -- +-- Copyright (C) 1996 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 2, 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. See the GNU General Public License -- +-- for more details. You should have received a copy of the GNU General -- +-- Public License distributed with GNAT; see file COPYING. If not, write -- +-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, -- +-- MA 02111-1307, USA. -- +-- -- +-- As a special exception, if other files instantiate generics from this -- +-- unit, or you link this unit with other files to produce an executable, -- +-- this unit does not by itself cause the resulting executable to be -- +-- covered by the GNU General Public License. This exception does not -- +-- however invalidate any other reasons why the executable file might be -- +-- covered by the GNU Public License. -- +-- -- +-- GNAT was originally developed by the GNAT team at New York University. -- +-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). -- +-- -- +------------------------------------------------------------------------------ + +package body System.Mantissa is + + -------------------- + -- Mantissa_Value -- + -------------------- + + function Mantissa_Value (First, Last : Integer) return Natural is + Result : Natural := 0; + + Val : Integer := Integer'Max (abs First - 1, abs Last); + -- Note: First-1 allows for twos complement largest neg number + + begin + while Val /= 0 loop + Val := Val / 2; + Result := Result + 1; + end loop; + + return Result; + end Mantissa_Value; + +end System.Mantissa; |