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   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                 G N A T . S S E . V E C T O R _ T Y P E S                --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --             Copyright (C) 2009, Free Software Foundation, Inc.           --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 3,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  21 --                                                                          --
  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- GNAT was originally developed  by the GNAT team at  New York University. --
  28 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  29 --                                                                          --
  30 ------------------------------------------------------------------------------
  31
  32 --  This unit exposes the Ada __m128 like data types to represent the contents
  33 --  of SSE registers, for use by bindings to the SSE intrinsic operations.
  34
  35 --  See GNAT.SSE for the list of targets where this facility is supported
  36
  37 package GNAT.SSE.Vector_Types is
  38
  39    --  The reference guide states a few usage guidelines for the C types:
  40
  41    --    Since these new data types are not basic ANSI C data types, you
  42    --    must observe the following usage restrictions:
  43    --
  44    --     * Use new data types only on either side of an assignment, as a
  45    --       return value, or as a parameter. You cannot use it with other
  46    --       arithmetic expressions ("+", "-", and so on).
  47    --
  48    --     * Use new data types as objects in aggregates, such as unions to
  49    --       access the byte elements and structures.
  50    --
  51    --     * Use new data types only with the respective intrinsics described
  52    --       in this documentation.
  53
  54    type m128  is private;  --  SSE >= 1
  55    type m128d is private;  --  SSE >= 2
  56    type m128i is private;  --  SSE >= 2
  57
  58 private
  59    --  Each of the m128 types maps to a specific vector_type with an extra
  60    --  "may_alias" attribute as in GCC's definitions for C, for instance in
  61    --  xmmintrin.h:
  62
  63    --  /* The Intel API is flexible enough that we must allow aliasing
  64    --     with other vector types, and their scalar components.  */
  65    --  typedef float __m128
  66    --    __attribute__ ((__vector_size__ (16), __may_alias__));
  67
  68    --  /* Internal data types for implementing the intrinsics.  */
  69    --  typedef float __v4sf __attribute__ ((__vector_size__ (16)));
  70
  71    ------------
  72    --  m128  --
  73    ------------
  74
  75    --  The __m128 data type can hold four 32-bit floating-point values
  76
  77    type m128 is array (1 .. 4) of Float32;
  78    for m128'Alignment use VECTOR_ALIGN;
  79    pragma Machine_Attribute (m128, "vector_type");
  80    pragma Machine_Attribute (m128, "may_alias");
  81
  82    -------------
  83    --  m128d  --
  84    -------------
  85
  86    --  The __m128d data type can hold two 64-bit floating-point values
  87
  88    type m128d is array (1 .. 2) of Float64;
  89    for m128d'Alignment use VECTOR_ALIGN;
  90    pragma Machine_Attribute (m128d, "vector_type");
  91    pragma Machine_Attribute (m128d, "may_alias");
  92
  93    -------------
  94    --  m128i  --
  95    -------------
  96
  97    --  The __m128i data type can hold sixteen 8-bit, eight 16-bit, four 32-bit,
  98    --  or two 64-bit integer values.
  99
 100    type m128i is array (1 .. 2) of Integer64;
 101    for m128i'Alignment use VECTOR_ALIGN;
 102    pragma Machine_Attribute (m128i, "vector_type");
 103    pragma Machine_Attribute (m128i, "may_alias");
 104
 105 end GNAT.SSE.Vector_Types;