matreshka_league_21.0.0_0c8f4d47/source/league/matreshka-internals-strings-configuration__x86.adb

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
------------------------------------------------------------------------------
--                                                                          --
--                            Matreshka Project                             --
--                                                                          --
--         Localization, Internationalization, Globalization for Ada        --
--                                                                          --
--                        Runtime Library Component                         --
--                                                                          --
------------------------------------------------------------------------------
--                                                                          --
-- Copyright © 2011-2013, Vadim Godunko <vgodunko@gmail.com>                --
-- All rights reserved.                                                     --
--                                                                          --
-- Redistribution and use in source and binary forms, with or without       --
-- modification, are permitted provided that the following conditions       --
-- are met:                                                                 --
--                                                                          --
--  * Redistributions of source code must retain the above copyright        --
--    notice, this list of conditions and the following disclaimer.         --
--                                                                          --
--  * Redistributions in binary form must reproduce the above copyright     --
--    notice, this list of conditions and the following disclaimer in the   --
--    documentation and/or other materials provided with the distribution.  --
--                                                                          --
--  * Neither the name of the Vadim Godunko, IE nor the names of its        --
--    contributors may be used to endorse or promote products derived from  --
--    this software without specific prior written permission.              --
--                                                                          --
-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS      --
-- "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT        --
-- LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR    --
-- A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT     --
-- HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,   --
-- SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED --
-- TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR   --
-- PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF   --
-- LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING     --
-- NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS       --
-- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.             --
--                                                                          --
------------------------------------------------------------------------------
--  $Revision: 4061 $ $Date: 2013-08-31 03:30:58 +0400 (Сб, 31 авг 2013) $
------------------------------------------------------------------------------
with Ada.Characters.Latin_1;
with Interfaces;
with System.Machine_Code;

with Matreshka.SIMD.Intel.CPUID;
with Matreshka.Internals.Strings.Handlers.Portable;
with Matreshka.Internals.Strings.Handlers.X86.SSE2;
with Matreshka.Internals.Strings.Handlers.X86.SSE2_POPCNT;

package body Matreshka.Internals.Strings.Configuration is

   use Ada.Characters.Latin_1;
   use type Interfaces.Unsigned_32;

   LFHT : constant String := LF & HT;

   function Has_CPUID return Boolean;
   --  Returns True when CPU supports 'cpuid' instruction.

   ---------------
   -- Has_CPUID --
   ---------------

   function Has_CPUID return Boolean is
      use type Interfaces.Unsigned_32;

      eax : Interfaces.Unsigned_32;
      ebx : Interfaces.Unsigned_32;

   begin
      --  This code is copied from GCC's cpuid.h file.

      System.Machine_Code.Asm
       (Template =>
          "pushf{l|d}" & LFHT
            & "pushf{l|d}" & LFHT
            & "pop{l}" & HT & "%0" & LFHT
            & "mov{l}" & HT & "{%0, %1|%1, %0}" & LFHT
            & "xor{l}" & HT & "{%2, %0|%0, %2}" & LFHT
            & "push{l}" & HT & "%0" & LFHT
            & "popf{l|d}" & LFHT
            & "pushf{l|d}" & LFHT
            & "pop{l}" & HT & "%0" & LFHT
            & "popf{l|d}" & LFHT,
        Outputs =>
         (Interfaces.Unsigned_32'Asm_Output ("=&r", eax),
          Interfaces.Unsigned_32'Asm_Output ("=&r", ebx)),
        Inputs =>
          Interfaces.Unsigned_32'Asm_Input ("i", 16#0020_0000#));

      return ((eax xor ebx) and 16#0020_0000#) /= 0;
   end Has_CPUID;

   ----------------
   -- Initialize --
   ----------------

   procedure Initialize is
   begin
      if not Has_CPUID
        or else Matreshka.SIMD.Intel.CPUID.Highest_CPUID < 1
      then
         --  CPU doesn't has CPUID instruction or doesn't support getting of
         --  features sets.

         String_Handler := Handlers.Portable.Handler'Access;

      elsif Matreshka.SIMD.Intel.CPUID.Has_SSE2 then
         if Matreshka.SIMD.Intel.CPUID.Has_POPCNT then
            --  CPU supports SSE instruction set and POPCNT instruction.

            String_Handler := Handlers.X86.SSE2_POPCNT.Handler'Access;

         else
            --  CPU supports SSE2 instructions set.

            String_Handler := Handlers.X86.SSE2.Handler'Access;
         end if;

      else
         --  CPU doesn't supports SSE2 instructions set.

         String_Handler := Handlers.Portable.Handler'Access;
      end if;
   end Initialize;

end Matreshka.Internals.Strings.Configuration;