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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 _ V I E W S --
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6 -- --
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7 -- S p e c --
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8 -- --
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131
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9 -- Copyright (C) 2005-2018, 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 unit provides public 'View' data types from/to which private vector
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33 -- representations can be converted via Altivec.Conversions. This allows
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34 -- convenient access to individual vector elements and provides a simple way
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35 -- to initialize vector objects.
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36
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37 -- Accessing vector contents with direct memory overlays should be avoided
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38 -- because actual vector representations may vary across configurations, for
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39 -- instance to accommodate different target endianness.
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40
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41 -- The natural representation of a vector is an array indexed by vector
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42 -- component number, which is materialized by the Varray type definitions
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43 -- below. The 16byte alignment constraint is unfortunately sometimes not
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44 -- properly honored for constant array aggregates, so the View types are
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45 -- actually records enclosing such arrays.
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46
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47 package GNAT.Altivec.Vector_Views is
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48
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49 ---------------------
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50 -- char components --
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51 ---------------------
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52
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53 type Vchar_Range is range 1 .. 16;
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54
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55 type Varray_unsigned_char is array (Vchar_Range) of unsigned_char;
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56 for Varray_unsigned_char'Alignment use VECTOR_ALIGNMENT;
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57
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58 type VUC_View is record
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59 Values : Varray_unsigned_char;
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60 end record;
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61
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62 type Varray_signed_char is array (Vchar_Range) of signed_char;
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63 for Varray_signed_char'Alignment use VECTOR_ALIGNMENT;
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64
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65 type VSC_View is record
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66 Values : Varray_signed_char;
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67 end record;
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68
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69 type Varray_bool_char is array (Vchar_Range) of bool_char;
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70 for Varray_bool_char'Alignment use VECTOR_ALIGNMENT;
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71
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72 type VBC_View is record
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73 Values : Varray_bool_char;
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74 end record;
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75
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76 ----------------------
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77 -- short components --
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78 ----------------------
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79
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80 type Vshort_Range is range 1 .. 8;
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81
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82 type Varray_unsigned_short is array (Vshort_Range) of unsigned_short;
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83 for Varray_unsigned_short'Alignment use VECTOR_ALIGNMENT;
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84
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85 type VUS_View is record
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86 Values : Varray_unsigned_short;
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87 end record;
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88
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89 type Varray_signed_short is array (Vshort_Range) of signed_short;
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90 for Varray_signed_short'Alignment use VECTOR_ALIGNMENT;
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91
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92 type VSS_View is record
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93 Values : Varray_signed_short;
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94 end record;
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95
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96 type Varray_bool_short is array (Vshort_Range) of bool_short;
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97 for Varray_bool_short'Alignment use VECTOR_ALIGNMENT;
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98
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99 type VBS_View is record
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100 Values : Varray_bool_short;
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101 end record;
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102
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103 --------------------
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104 -- int components --
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105 --------------------
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106
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107 type Vint_Range is range 1 .. 4;
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108
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109 type Varray_unsigned_int is array (Vint_Range) of unsigned_int;
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110 for Varray_unsigned_int'Alignment use VECTOR_ALIGNMENT;
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111
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112 type VUI_View is record
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113 Values : Varray_unsigned_int;
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114 end record;
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115
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116 type Varray_signed_int is array (Vint_Range) of signed_int;
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117 for Varray_signed_int'Alignment use VECTOR_ALIGNMENT;
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118
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119 type VSI_View is record
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120 Values : Varray_signed_int;
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121 end record;
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122
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123 type Varray_bool_int is array (Vint_Range) of bool_int;
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124 for Varray_bool_int'Alignment use VECTOR_ALIGNMENT;
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125
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126 type VBI_View is record
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127 Values : Varray_bool_int;
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128 end record;
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129
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130 ----------------------
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131 -- float components --
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132 ----------------------
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133
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134 type Vfloat_Range is range 1 .. 4;
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135
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136 type Varray_float is array (Vfloat_Range) of C_float;
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137 for Varray_float'Alignment use VECTOR_ALIGNMENT;
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138
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139 type VF_View is record
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140 Values : Varray_float;
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141 end record;
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142
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143 ----------------------
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144 -- pixel components --
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145 ----------------------
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146
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147 type Vpixel_Range is range 1 .. 8;
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148
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149 type Varray_pixel is array (Vpixel_Range) of pixel;
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150 for Varray_pixel'Alignment use VECTOR_ALIGNMENT;
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151
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152 type VP_View is record
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153 Values : Varray_pixel;
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154 end record;
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155
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156 end GNAT.Altivec.Vector_Views;
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