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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 . A L T I V E C . V E C T O R _ T Y P E S --
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6 -- --
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7 -- S p e c --
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8 -- --
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9 -- Copyright (C) 2004-2017, Free Software Foundation, Inc. --
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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 unit exposes the various vector types part of the Ada binding to
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33 -- Altivec facilities.
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34
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35 with GNAT.Altivec.Low_Level_Vectors;
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36
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37 package GNAT.Altivec.Vector_Types is
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38
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39 ---------------------------------------------------
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40 -- Vector type declarations [PIM-2.1 Data Types] --
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41 ---------------------------------------------------
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42
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43 -- Except for assignments and pointer creation/dereference, operations
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44 -- on vectors are only performed via subprograms. The vector types are
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45 -- then private, and non-limited since assignments are allowed.
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46
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47 -- The Hard/Soft binding type-structure differentiation is achieved in
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48 -- Low_Level_Vectors. Each version only exposes private vector types, that
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49 -- we just sub-type here. This is fine from the design standpoint and
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50 -- reduces the amount of explicit conversion required in various places
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51 -- internally.
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52
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53 subtype vector_unsigned_char is Low_Level_Vectors.LL_VUC;
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54 subtype vector_signed_char is Low_Level_Vectors.LL_VSC;
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55 subtype vector_bool_char is Low_Level_Vectors.LL_VBC;
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56
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57 subtype vector_unsigned_short is Low_Level_Vectors.LL_VUS;
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58 subtype vector_signed_short is Low_Level_Vectors.LL_VSS;
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59 subtype vector_bool_short is Low_Level_Vectors.LL_VBS;
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60
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61 subtype vector_unsigned_int is Low_Level_Vectors.LL_VUI;
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62 subtype vector_signed_int is Low_Level_Vectors.LL_VSI;
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63 subtype vector_bool_int is Low_Level_Vectors.LL_VBI;
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64
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65 subtype vector_float is Low_Level_Vectors.LL_VF;
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66 subtype vector_pixel is Low_Level_Vectors.LL_VP;
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67
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68 -- [PIM-2.1] shows groups of declarations with exact same component types,
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69 -- e.g. vector unsigned short together with vector unsigned short int. It
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70 -- so appears tempting to define subtypes for those matches here.
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71 --
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72 -- [PIM-2.1] does not qualify items in those groups as "the same types",
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73 -- though, and [PIM-2.4.2 Assignments] reads: "if either the left hand
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74 -- side or the right hand side of an expression has a vector type, then
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75 -- both sides of the expression must be of the same vector type".
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76 --
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77 -- Not so clear what is exactly right, then. We go with subtypes for now
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78 -- and can adjust later if need be.
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79
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80 subtype vector_unsigned_short_int is vector_unsigned_short;
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81 subtype vector_signed_short_int is vector_signed_short;
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82
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83 subtype vector_char is vector_signed_char;
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84 subtype vector_short is vector_signed_short;
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85 subtype vector_int is vector_signed_int;
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86
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87 --------------------------------
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88 -- Corresponding access types --
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89 --------------------------------
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90
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91 type vector_unsigned_char_ptr is access all vector_unsigned_char;
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92 type vector_signed_char_ptr is access all vector_signed_char;
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93 type vector_bool_char_ptr is access all vector_bool_char;
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94
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95 type vector_unsigned_short_ptr is access all vector_unsigned_short;
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96 type vector_signed_short_ptr is access all vector_signed_short;
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97 type vector_bool_short_ptr is access all vector_bool_short;
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98
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99 type vector_unsigned_int_ptr is access all vector_unsigned_int;
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100 type vector_signed_int_ptr is access all vector_signed_int;
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101 type vector_bool_int_ptr is access all vector_bool_int;
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102
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103 type vector_float_ptr is access all vector_float;
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104 type vector_pixel_ptr is access all vector_pixel;
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105
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106 --------------------------------------------------------------------
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107 -- Additional access types, for the sake of some argument passing --
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108 --------------------------------------------------------------------
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109
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110 -- ... because some of the operations expect pointers to possibly
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111 -- constant objects.
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112
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113 type const_vector_bool_char_ptr is access constant vector_bool_char;
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114 type const_vector_signed_char_ptr is access constant vector_signed_char;
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115 type const_vector_unsigned_char_ptr is access constant vector_unsigned_char;
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116
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117 type const_vector_bool_short_ptr is access constant vector_bool_short;
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118 type const_vector_signed_short_ptr is access constant vector_signed_short;
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119 type const_vector_unsigned_short_ptr is access
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120 constant vector_unsigned_short;
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121
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122 type const_vector_bool_int_ptr is access constant vector_bool_int;
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123 type const_vector_signed_int_ptr is access constant vector_signed_int;
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124 type const_vector_unsigned_int_ptr is access constant vector_unsigned_int;
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125
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126 type const_vector_float_ptr is access constant vector_float;
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127 type const_vector_pixel_ptr is access constant vector_pixel;
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128
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129 ----------------------
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130 -- Useful shortcuts --
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131 ----------------------
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132
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133 subtype VUC is vector_unsigned_char;
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134 subtype VSC is vector_signed_char;
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135 subtype VBC is vector_bool_char;
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136
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137 subtype VUS is vector_unsigned_short;
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138 subtype VSS is vector_signed_short;
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139 subtype VBS is vector_bool_short;
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140
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141 subtype VUI is vector_unsigned_int;
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142 subtype VSI is vector_signed_int;
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143 subtype VBI is vector_bool_int;
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144
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145 subtype VP is vector_pixel;
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146 subtype VF is vector_float;
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147
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148 end GNAT.Altivec.Vector_Types;
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