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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT COMPILER COMPONENTS --
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4 -- --
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5 -- G N A T . S S E --
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6 -- --
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7 -- S p e c --
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8 -- --
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145
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9 -- Copyright (C) 2009-2019, Free Software Foundation, Inc. --
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111
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNAT was originally developed by the GNAT team at New York University. --
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28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 -- This package is the root of a set aimed at offering Ada bindings to a
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33 -- subset of the Intel(r) Streaming SIMD Extensions with GNAT. The purpose
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34 -- is to allow access from Ada to the SSE facilities defined in the Intel(r)
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35 -- compiler manuals, in particular in the Intrinsics Reference of the C++
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36 -- Compiler User's Guide, available from http://www.intel.com.
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37
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38 -- Assuming actual hardware support is available, this capability is
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39 -- currently supported on the following set of targets:
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40
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41 -- GNU/Linux x86 and x86_64
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42 -- Windows XP/Vista x86 and x86_64
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43 -- Solaris x86
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44 -- Darwin x86_64
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45
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46 -- This unit exposes vector _component_ types together with general comments
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47 -- on the binding contents.
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48
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49 -- One other unit is offered as of today: GNAT.SSE.Vector_Types, which
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50 -- exposes Ada types corresponding to the reference types (__m128 and the
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51 -- like) over which a binding to the SSE GCC builtins may operate.
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52
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53 -- The exposed Ada types are private. Object initializations or value
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54 -- observations may be performed with unchecked conversions or address
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55 -- overlays, for example:
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56
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57 -- with Ada.Unchecked_Conversion;
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58 -- with GNAT.SSE.Vector_Types; use GNAT.SSE, GNAT.SSE.Vector_Types;
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59
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60 -- procedure SSE_Base is
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61
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62 -- -- Core operations
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63
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64 -- function ia32_addps (A, B : m128) return m128;
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65 -- pragma Import (Intrinsic, ia32_addps, "__builtin_ia32_addps");
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66
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67 -- -- User views & conversions
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68
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69 -- type Vf32_View is array (1 .. 4) of GNAT.SSE.Float32;
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70 -- for Vf32_View'Alignment use VECTOR_ALIGN;
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71
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72 -- function To_m128 is new Ada.Unchecked_Conversion (Vf32_View, m128);
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73
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74 -- Xf32 : constant Vf32_View := (1.0, 1.0, 2.0, 2.0);
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75 -- Yf32 : constant Vf32_View := (2.0, 2.0, 1.0, 1.0);
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76
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77 -- X128 : constant m128 := To_m128 (Xf32);
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78 -- Y128 : constant m128 := To_m128 (Yf32);
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79
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80 -- begin
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81 -- -- Operations & overlays
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82
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83 -- declare
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84 -- Z128 : m128;
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85 -- Zf32 : Vf32_View;
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86 -- for Zf32'Address use Z128'Address;
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87 -- begin
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88 -- Z128 := ia32_addps (X128, Y128);
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89 -- if Zf32 /= (3.0, 3.0, 3.0, 3.0) then
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90 -- raise Program_Error;
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91 -- end if;
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92 -- end;
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93
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94 -- declare
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95 -- type m128_View_Kind is (SSE, F32);
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96 -- type m128_Object (View : m128_View_Kind := F32) is record
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97 -- case View is
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98 -- when SSE => V128 : m128;
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99 -- when F32 => Vf32 : Vf32_View;
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100 -- end case;
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101 -- end record;
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102 -- pragma Unchecked_Union (m128_Object);
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103
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104 -- O1 : constant m128_Object := (View => SSE, V128 => X128);
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105 -- begin
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106 -- if O1.Vf32 /= Xf32 then
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107 -- raise Program_Error;
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108 -- end if;
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109 -- end;
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110 -- end SSE_Base;
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111
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112 package GNAT.SSE is
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113
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114 -----------------------------------
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115 -- Common vector characteristics --
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116 -----------------------------------
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117
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118 VECTOR_BYTES : constant := 16;
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119 -- Common size of all the SSE vector types, in bytes.
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120
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121 VECTOR_ALIGN : constant := 16;
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122 -- Common alignment of all the SSE vector types, in bytes.
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123
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124 -- Alignment-wise, the reference document reads:
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125 -- << The compiler aligns __m128d and _m128i local and global data to
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126 -- 16-byte boundaries on the stack. >>
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127 --
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128 -- We apply that consistently to all the Ada vector types, as GCC does
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129 -- for the corresponding C types.
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130
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131 ----------------------------
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132 -- Vector component types --
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133 ----------------------------
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134
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135 type Float32 is new Float;
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136 type Float64 is new Long_Float;
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137 type Integer64 is new Long_Long_Integer;
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138
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139 end GNAT.SSE;
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