-- FXA5A00.A
--
--                             Grant of Unlimited Rights
--
--     Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
--     F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained 
--     unlimited rights in the software and documentation contained herein.
--     Unlimited rights are defined in DFAR 252.227-7013(a)(19).  By making 
--     this public release, the Government intends to confer upon all 
--     recipients unlimited rights  equal to those held by the Government.  
--     These rights include rights to use, duplicate, release or disclose the 
--     released technical data and computer software in whole or in part, in 
--     any manner and for any purpose whatsoever, and to have or permit others 
--     to do so.
--
--                                    DISCLAIMER
--
--     ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
--     DISCLOSED ARE AS IS.  THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED 
--     WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
--     SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE 
--     OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
--     PARTICULAR PURPOSE OF SAID MATERIAL.
--*
--
-- FOUNDATION DESCRIPTION:
--      This foundation package contains constants and a function used in 
--      the evaluation of the Generic Elementary Functions.
--
-- CHANGE HISTORY:
--      06 Mar 95   SAIC    Initial prerelease version.
--      03 Apr 95   SAIC    Corrected error in context clause.
--      12 Jun 95   SAIC    Added procedure Dont_Optimize.  Added New_Float
--                          type, and overload of function 
--                          Result_Within_Range.
--
--!

with Ada.Numerics;
with Report;

package FXA5A00 is

   -- Constants.

   Epsilon               : constant Float := Float'Model_Epsilon;
   Small                 : constant Float := Float'Model_Small;
   Large                 : constant Float := Float'Safe_Last;
   Minus_Large           : constant Float := Float'Safe_First; 

   Half_Pi               : constant Float := Ada.Numerics.Pi / 2.0;
   Two_Pi                : constant Float := Ada.Numerics.Pi * 2.0;

   Floating_Delta        : constant Float :=  0.05;
   One_Plus_Delta        : constant Float :=  1.0 + Floating_Delta;
   One_Minus_Delta       : constant Float :=  1.0 - Floating_Delta;
   Minus_One_Plus_Delta  : constant Float := -1.0 + Floating_Delta;
   Minus_One_Minus_Delta : constant Float := -1.0 - Floating_Delta;


   type New_Float is new Float digits 6;

   function Result_Within_Range (Result          : Float;
                                 Expected_Result : Float;
                                 Relative_Error  : Float) return Boolean;

   function Result_Within_Range (Result          : New_Float;
                                 Expected_Result : Float;
                                 Relative_Error  : Float) return Boolean;

   -- This procedure is designed to defeat optimization attempts by an 
   -- implementation in cases where an exception is specifically raised
   -- in a test to test a prescribed exception result condition.
   -- The parameter Num is a unique identifier for location purposes within
   -- the test.

   generic
      type Eval_Type is digits <>;
   procedure Dont_Optimize (Check_Result : Eval_Type; 
                            Num          : Integer);

end FXA5A00;

---

package body FXA5A00 is


   function Result_Within_Range (Result          : Float;
                                 Expected_Result : Float;
                                 Relative_Error  : Float) return Boolean is
   begin
      return (Result <= Expected_Result + Relative_Error) and 
             (Result >= Expected_Result - Relative_Error);
   end Result_Within_Range;


   function Result_Within_Range (Result          : New_Float;
                                 Expected_Result : Float;
                                 Relative_Error  : Float) return Boolean is
   begin
      return (Float(Result) <= Expected_Result + Relative_Error) and 
             (Float(Result) >= Expected_Result - Relative_Error);
   end Result_Within_Range;


   procedure Dont_Optimize (Check_Result : Eval_Type; 
                            Num          : Integer) is
   begin
      -- Note that the use of Minus_Large here is simply as a "dummy" value,
      -- designed to indicate use of the Check_Result parameter, and has no
      -- pass/fail significance to any test using this procedure.
      --
      if Float(Check_Result) = Minus_Large then
         Report.Comment("Attempted Defeat of Optimization ONLY -- Not " &
                        "a cause for test failure! "                    & 
                        "Result = Minus_Large, Case:" & Integer'Image(Num));
      end if;
   end Dont_Optimize;

end FXA5A00;