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   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --           S Y S T E M . V A X _ F L O A T _ O P E R A T I O N S          --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1997-1998 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 2,  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.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  19 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  20 -- MA 02111-1307, USA.                                                      --
  21 --                                                                          --
  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- GNAT was originally developed  by the GNAT team at  New York University. --
  30 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 --  This package contains runtime routines for handling the non-IEEE
  35 --  floating-point formats used on the Vax and the Alpha.
  36
  37 package System.Vax_Float_Operations is
  38
  39    pragma Warnings (Off);
  40    --  Suppress warnings if not on Alpha/VAX
  41
  42    type D is digits 9;
  43    pragma Float_Representation (VAX_Float, D);
  44    --  D Float type on Vax
  45
  46    type G is digits 15;
  47    pragma Float_Representation (VAX_Float, G);
  48    --  G Float type on Vax
  49
  50    type F is digits 6;
  51    pragma Float_Representation (VAX_Float, F);
  52    --  F Float type on Vax
  53
  54    type S is digits 6;
  55    pragma Float_Representation (IEEE_Float, S);
  56    --  IEEE short
  57
  58    type T is digits 15;
  59    pragma Float_Representation (IEEE_Float, T);
  60    --  IEEE long
  61
  62    pragma Warnings (On);
  63
  64    type Q is range -2 ** 63 .. +(2 ** 63 - 1);
  65    --  64-bit signed integer
  66
  67    --------------------------
  68    -- Conversion Functions --
  69    --------------------------
  70
  71    function D_To_G (X : D) return G;
  72    function G_To_D (X : G) return D;
  73    --  Conversions between D float and G float
  74
  75    function G_To_F (X : G) return F;
  76    function F_To_G (X : F) return G;
  77    --  Conversions between F float and G float
  78
  79    function F_To_S (X : F) return S;
  80    function S_To_F (X : S) return F;
  81    --  Conversions between F float and IEEE short
  82
  83    function G_To_T (X : G) return T;
  84    function T_To_G (X : T) return G;
  85    --  Conversions between G float and IEEE long
  86
  87    function F_To_Q (X : F) return Q;
  88    function Q_To_F (X : Q) return F;
  89    --  Conversions between F float and 64-bit integer
  90
  91    function G_To_Q (X : G) return Q;
  92    function Q_To_G (X : Q) return G;
  93    --  Conversions between G float and 64-bit integer
  94
  95    function T_To_D (X : T) return D;
  96    --  Conversion from IEEE long to D_Float (used for literals)
  97
  98    --------------------------
  99    -- Arithmetic Functions --
 100    --------------------------
 101
 102    function Abs_F (X : F) return F;
 103    function Abs_G (X : G) return G;
 104    --  Absolute value of F/G float
 105
 106    function Add_F (X, Y : F) return F;
 107    function Add_G (X, Y : G) return G;
 108    --  Addition of F/G float
 109
 110    function Div_F (X, Y : F) return F;
 111    function Div_G (X, Y : G) return G;
 112    --  Division of F/G float
 113
 114    function Mul_F (X, Y : F) return F;
 115    function Mul_G (X, Y : G) return G;
 116    --  Multiplication of F/G float
 117
 118    function Neg_F (X : F) return F;
 119    function Neg_G (X : G) return G;
 120    --  Negation of F/G float
 121
 122    function Sub_F (X, Y : F) return F;
 123    function Sub_G (X, Y : G) return G;
 124    --  Subtraction of F/G float
 125
 126    --------------------------
 127    -- Comparison Functions --
 128    --------------------------
 129
 130    function Eq_F (X, Y : F) return Boolean;
 131    function Eq_G (X, Y : G) return Boolean;
 132    --  Compares for X = Y
 133
 134    function Le_F (X, Y : F) return Boolean;
 135    function Le_G (X, Y : G) return Boolean;
 136    --  Compares for X <= Y
 137
 138    function Lt_F (X, Y : F) return Boolean;
 139    function Lt_G (X, Y : G) return Boolean;
 140    --  Compares for X < Y
 141
 142    ----------------------
 143    -- Debug Procedures --
 144    ----------------------
 145
 146    procedure Debug_Output_D (Arg : D);
 147    procedure Debug_Output_F (Arg : F);
 148    procedure Debug_Output_G (Arg : G);
 149    pragma Export (Ada, Debug_Output_D);
 150    pragma Export (Ada, Debug_Output_F);
 151    pragma Export (Ada, Debug_Output_G);
 152    --  These routines output their argument in decimal string form, with
 153    --  no terminating line return. They are provided for implicit use by
 154    --  the pre gnat-3.12w GDB, and are retained for backwards compatibility.
 155
 156    function Debug_String_D (Arg : D) return System.Address;
 157    function Debug_String_F (Arg : F) return System.Address;
 158    function Debug_String_G (Arg : G) return System.Address;
 159    pragma Export (Ada, Debug_String_D);
 160    pragma Export (Ada, Debug_String_F);
 161    pragma Export (Ada, Debug_String_G);
 162    --  These routines return a decimal C string image of their argument.
 163    --  They are provided for implicit use by the debugger, in response to
 164    --  the special encoding used for Vax floating-point types (see Exp_Dbug
 165    --  for details). They supercede the above Debug_Output_D/F/G routines
 166    --  which didn't work properly with GDBTK.
 167
 168    procedure pd (Arg : D);
 169    procedure pf (Arg : F);
 170    procedure pg (Arg : G);
 171    pragma Export (Ada, pd);
 172    pragma Export (Ada, pf);
 173    pragma Export (Ada, pg);
 174    --  These are like the Debug_Output_D/F/G procedures except that they
 175    --  output a line return after the output. They were originally present
 176    --  for direct use in GDB before GDB recognized Vax floating-point
 177    --  types, and are retained for backwards compatibility.
 178
 179 private
 180    pragma Inline (D_To_G);
 181    pragma Inline (F_To_G);
 182    pragma Inline (F_To_Q);
 183    pragma Inline (F_To_S);
 184    pragma Inline (G_To_D);
 185    pragma Inline (G_To_F);
 186    pragma Inline (G_To_Q);
 187    pragma Inline (G_To_T);
 188    pragma Inline (Q_To_F);
 189    pragma Inline (Q_To_G);
 190    pragma Inline (S_To_F);
 191    pragma Inline (T_To_G);
 192
 193    pragma Inline (Abs_F);
 194    pragma Inline (Abs_G);
 195    pragma Inline (Add_F);
 196    pragma Inline (Add_G);
 197    pragma Inline (Div_G);
 198    pragma Inline (Div_F);
 199    pragma Inline (Mul_F);
 200    pragma Inline (Mul_G);
 201    pragma Inline (Neg_G);
 202    pragma Inline (Neg_F);
 203    pragma Inline (Sub_F);
 204    pragma Inline (Sub_G);
 205
 206    pragma Inline (Eq_F);
 207    pragma Inline (Eq_G);
 208    pragma Inline (Le_F);
 209    pragma Inline (Le_G);
 210    pragma Inline (Lt_F);
 211    pragma Inline (Lt_G);
 212
 213 end System.Vax_Float_Operations;