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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 . 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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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 unit exposes the Ada __m128 like data types to represent the contents
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33 -- of SSE registers, for use by bindings to the SSE intrinsic operations.
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34
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35 -- See GNAT.SSE for the list of targets where this facility is supported
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36
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37 package GNAT.SSE.Vector_Types is
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38
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39 -- The reference guide states a few usage guidelines for the C types:
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40
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41 -- Since these new data types are not basic ANSI C data types, you
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42 -- must observe the following usage restrictions:
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43 --
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44 -- * Use new data types only on either side of an assignment, as a
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45 -- return value, or as a parameter. You cannot use it with other
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46 -- arithmetic expressions ("+", "-", and so on).
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47 --
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48 -- * Use new data types as objects in aggregates, such as unions to
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49 -- access the byte elements and structures.
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50 --
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51 -- * Use new data types only with the respective intrinsics described
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52 -- in this documentation.
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53
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54 type m128 is private; -- SSE >= 1
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55 type m128d is private; -- SSE >= 2
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56 type m128i is private; -- SSE >= 2
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57
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58 private
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59 -- Each of the m128 types maps to a specific vector_type with an extra
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60 -- "may_alias" attribute as in GCC's definitions for C, for instance in
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61 -- xmmintrin.h:
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62
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63 -- /* The Intel API is flexible enough that we must allow aliasing
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64 -- with other vector types, and their scalar components. */
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65 -- typedef float __m128
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66 -- __attribute__ ((__vector_size__ (16), __may_alias__));
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67
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68 -- /* Internal data types for implementing the intrinsics. */
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69 -- typedef float __v4sf __attribute__ ((__vector_size__ (16)));
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70
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71 ------------
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72 -- m128 --
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73 ------------
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74
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75 -- The __m128 data type can hold four 32-bit floating-point values
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76
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77 type m128 is array (1 .. 4) of Float32;
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78 for m128'Alignment use VECTOR_ALIGN;
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79 pragma Machine_Attribute (m128, "vector_type");
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80 pragma Machine_Attribute (m128, "may_alias");
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81
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82 -------------
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83 -- m128d --
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84 -------------
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85
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86 -- The __m128d data type can hold two 64-bit floating-point values
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87
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88 type m128d is array (1 .. 2) of Float64;
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89 for m128d'Alignment use VECTOR_ALIGN;
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90 pragma Machine_Attribute (m128d, "vector_type");
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91 pragma Machine_Attribute (m128d, "may_alias");
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92
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93 -------------
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94 -- m128i --
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95 -------------
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96
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97 -- The __m128i data type can hold sixteen 8-bit, eight 16-bit, four 32-bit,
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98 -- or two 64-bit integer values.
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99
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100 type m128i is array (1 .. 2) of Integer64;
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101 for m128i'Alignment use VECTOR_ALIGN;
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102 pragma Machine_Attribute (m128i, "vector_type");
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103 pragma Machine_Attribute (m128i, "may_alias");
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104
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105 end GNAT.SSE.Vector_Types;
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