gcc/testsuite/gnat.dg/opt18.adb

   1 -- { dg-do compile }
   2 -- { dg-options "-O3" }
   3
   4 with Opt18_Pkg; use Opt18_Pkg;
   5
   6 package body Opt18 is
   7
   8    function Mag (Item : in Cart_Vector_Type) return Float is
   9    begin
  10       return Sqrt (Item (X) * Item (X) + Item (Y) * Item (Y)
  11                    + Item (Z) * Item (Z));
  12    end;
  13
  14    function Unit_Quaternion_To_Mag_Axis (Quaternion : in Unit_Quaternion_Type)
  15    return Mag_Axis_Type is
  16       Sin_Half : Float
  17          := Mag (Cart_Vector_Type'(Quaternion.X, Quaternion.Y, Quaternion.Z));
  18    begin
  19       if Sin_Half > 3.0 * First_Order_Trig then
  20          return
  21             (Mag  => Atan2 (Double_Trig (Unchecked_Trig_Pair (Sin_Half,
  22                                                               Quaternion.S))),
  23              Axis => Unit_Vector_Type'(Quaternion.X / Sin_Half,
  24                                        Quaternion.Y / Sin_Half,
  25                                        Quaternion.Z / Sin_Half));
  26       else
  27          return (0.0, X_Unit);
  28       end if;
  29    end;
  30
  31 end Opt18;