gcc/ada/s-geveop.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --
   4 --                                                                          --
   5 --      S Y S T E M . G E N E R I C _ V E C T O R _ O P E R A T I O N S     --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 2002-2005 Free Software Foundation, Inc.          --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  19 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, USA.                                              --
  21 --                                                                          --
  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- GNAT was originally developed  by the GNAT team at  New York University. --
  30 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 with System;                    use System;
  35 with System.Address_Operations; use System.Address_Operations;
  36 with System.Storage_Elements;   use System.Storage_Elements;
  37
  38 with Unchecked_Conversion;
  39
  40 package body System.Generic_Vector_Operations is
  41
  42    IU : constant Integer := Integer (Storage_Unit);
  43    VU : constant Address := Address (Vectors.Vector'Size / IU);
  44    EU : constant Address := Address (Element_Array'Component_Size / IU);
  45
  46    ----------------------
  47    -- Binary_Operation --
  48    ----------------------
  49
  50    procedure Binary_Operation
  51      (R, X, Y : System.Address;
  52       Length  : System.Storage_Elements.Storage_Count)
  53    is
  54       RA : Address := R;
  55       XA : Address := X;
  56       YA : Address := Y;
  57       --  Address of next element to process in R, X and Y
  58
  59       VI : constant Integer_Address := To_Integer (VU);
  60
  61       Unaligned : constant Integer_Address :=
  62                     Boolean'Pos (ModA (OrA (OrA (RA, XA), YA), VU) /= 0) - 1;
  63       --  Zero iff one or more argument addresses is not aligned, else all 1's
  64
  65       type Vector_Ptr is access all Vectors.Vector;
  66       type Element_Ptr is access all Element;
  67
  68       function VP is new Unchecked_Conversion (Address, Vector_Ptr);
  69       function EP is new Unchecked_Conversion (Address, Element_Ptr);
  70
  71       SA : constant Address :=
  72              AddA (XA, To_Address
  73                          ((Integer_Address (Length) / VI * VI) and Unaligned));
  74       --  First address of argument X to start serial processing
  75
  76    begin
  77       while XA < SA loop
  78          VP (RA).all := Vector_Op (VP (XA).all, VP (YA).all);
  79          XA := AddA (XA, VU);
  80          YA := AddA (YA, VU);
  81          RA := AddA (RA, VU);
  82       end loop;
  83
  84       while XA < X + Length loop
  85          EP (RA).all := Element_Op (EP (XA).all, EP (YA).all);
  86          XA := AddA (XA, EU);
  87          YA := AddA (YA, EU);
  88          RA := AddA (RA, EU);
  89       end loop;
  90    end Binary_Operation;
  91
  92    ----------------------
  93    -- Unary_Operation --
  94    ----------------------
  95
  96    procedure Unary_Operation
  97      (R, X    : System.Address;
  98       Length  : System.Storage_Elements.Storage_Count)
  99    is
 100       RA : Address := R;
 101       XA : Address := X;
 102       --  Address of next element to process in R and X
 103
 104       VI : constant Integer_Address := To_Integer (VU);
 105
 106       Unaligned : constant Integer_Address :=
 107                     Boolean'Pos (ModA (OrA (RA, XA), VU) /= 0) - 1;
 108       --  Zero iff one or more argument addresses is not aligned, else all 1's
 109
 110       type Vector_Ptr is access all Vectors.Vector;
 111       type Element_Ptr is access all Element;
 112
 113       function VP is new Unchecked_Conversion (Address, Vector_Ptr);
 114       function EP is new Unchecked_Conversion (Address, Element_Ptr);
 115
 116       SA : constant Address :=
 117              AddA (XA, To_Address
 118                          ((Integer_Address (Length) / VI * VI) and Unaligned));
 119       --  First address of argument X to start serial processing
 120
 121    begin
 122       while XA < SA loop
 123          VP (RA).all := Vector_Op (VP (XA).all);
 124          XA := AddA (XA, VU);
 125          RA := AddA (RA, VU);
 126       end loop;
 127
 128       while XA < X + Length loop
 129          EP (RA).all := Element_Op (EP (XA).all);
 130          XA := AddA (XA, EU);
 131          RA := AddA (RA, EU);
 132       end loop;
 133    end Unary_Operation;
 134
 135 end System.Generic_Vector_Operations;