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------------------------------------------------------------------------------ -- -- -- GNAT COMPILER COMPONENTS -- -- -- -- S Y S T E M . V A X _ F L O A T _ O P E R A T I O N S -- -- -- -- S p e c -- -- -- -- Copyright (C) 1997-2009, Free Software Foundation, Inc. -- -- -- -- GNAT is free software; you can redistribute it and/or modify it under -- -- terms of the GNU General Public License as published by the Free Soft- -- -- ware Foundation; either version 3, or (at your option) any later ver- -- -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- -- or FITNESS FOR A PARTICULAR PURPOSE. -- -- -- -- As a special exception under Section 7 of GPL version 3, you are granted -- -- additional permissions described in the GCC Runtime Library Exception, -- -- version 3.1, as published by the Free Software Foundation. -- -- -- -- You should have received a copy of the GNU General Public License and -- -- a copy of the GCC Runtime Library Exception along with this program; -- -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- -- <http://www.gnu.org/licenses/>. -- -- -- -- GNAT was originally developed by the GNAT team at New York University. -- -- Extensive contributions were provided by Ada Core Technologies Inc. -- -- -- ------------------------------------------------------------------------------ -- This package contains runtime routines for handling the non-IEEE -- floating-point formats used on the Vax and the Alpha. package System.Vax_Float_Operations is pragma Warnings (Off); -- Suppress warnings if not on Alpha/VAX type D is digits 9; pragma Float_Representation (VAX_Float, D); -- D Float type on Vax type G is digits 15; pragma Float_Representation (VAX_Float, G); -- G Float type on Vax type F is digits 6; pragma Float_Representation (VAX_Float, F); -- F Float type on Vax type S is digits 6; pragma Float_Representation (IEEE_Float, S); -- IEEE short type T is digits 15; pragma Float_Representation (IEEE_Float, T); -- IEEE long pragma Warnings (On); type Q is range -2 ** 63 .. +(2 ** 63 - 1); -- 64-bit signed integer -------------------------- -- Conversion Functions -- -------------------------- function D_To_G (X : D) return G; function G_To_D (X : G) return D; -- Conversions between D float and G float function G_To_F (X : G) return F; function F_To_G (X : F) return G; -- Conversions between F float and G float function F_To_S (X : F) return S; function S_To_F (X : S) return F; -- Conversions between F float and IEEE short function G_To_T (X : G) return T; function T_To_G (X : T) return G; -- Conversions between G float and IEEE long function F_To_Q (X : F) return Q; function Q_To_F (X : Q) return F; -- Conversions between F float and 64-bit integer function G_To_Q (X : G) return Q; function Q_To_G (X : Q) return G; -- Conversions between G float and 64-bit integer function T_To_D (X : T) return D; -- Conversion from IEEE long to D_Float (used for literals) -------------------------- -- Arithmetic Functions -- -------------------------- function Abs_F (X : F) return F; function Abs_G (X : G) return G; -- Absolute value of F/G float function Add_F (X, Y : F) return F; function Add_G (X, Y : G) return G; -- Addition of F/G float function Div_F (X, Y : F) return F; function Div_G (X, Y : G) return G; -- Division of F/G float function Mul_F (X, Y : F) return F; function Mul_G (X, Y : G) return G; -- Multiplication of F/G float function Neg_F (X : F) return F; function Neg_G (X : G) return G; -- Negation of F/G float function Sub_F (X, Y : F) return F; function Sub_G (X, Y : G) return G; -- Subtraction of F/G float -------------------------- -- Comparison Functions -- -------------------------- function Eq_F (X, Y : F) return Boolean; function Eq_G (X, Y : G) return Boolean; -- Compares for X = Y function Le_F (X, Y : F) return Boolean; function Le_G (X, Y : G) return Boolean; -- Compares for X <= Y function Lt_F (X, Y : F) return Boolean; function Lt_G (X, Y : G) return Boolean; -- Compares for X < Y function Ne_F (X, Y : F) return Boolean; function Ne_G (X, Y : G) return Boolean; -- Compares for X /= Y ---------------------- -- Return Functions -- ---------------------- function Return_D (X : D) return D; function Return_F (X : F) return F; function Return_G (X : G) return G; -- Deal with returned value for an imported function where the function -- result is of VAX Float type. Usually nothing needs to be done, and these -- functions return their argument unchanged. But for the case of VMS Alpha -- the return value is already in $f0, so we need to trick the compiler -- into thinking that we are moving X to $f0. See bodies for this case -- for the Asm sequence generated to achieve this. ---------------------------------- -- Routines for Valid Attribute -- ---------------------------------- function Valid_D (Arg : D) return Boolean; function Valid_F (Arg : F) return Boolean; function Valid_G (Arg : G) return Boolean; -- Test whether Arg has a valid representation ---------------------- -- Debug Procedures -- ---------------------- procedure Debug_Output_D (Arg : D); procedure Debug_Output_F (Arg : F); procedure Debug_Output_G (Arg : G); pragma Export (Ada, Debug_Output_D); pragma Export (Ada, Debug_Output_F); pragma Export (Ada, Debug_Output_G); -- These routines output their argument in decimal string form, with -- no terminating line return. They are provided for implicit use by -- the pre gnat-3.12w GDB, and are retained for backwards compatibility. function Debug_String_D (Arg : D) return System.Address; function Debug_String_F (Arg : F) return System.Address; function Debug_String_G (Arg : G) return System.Address; pragma Export (Ada, Debug_String_D); pragma Export (Ada, Debug_String_F); pragma Export (Ada, Debug_String_G); -- These routines return a decimal C string image of their argument. -- They are provided for implicit use by the debugger, in response to -- the special encoding used for Vax floating-point types (see Exp_Dbug -- for details). They supersede the above Debug_Output_D/F/G routines -- which didn't work properly with GDBTK. procedure pd (Arg : D); procedure pf (Arg : F); procedure pg (Arg : G); pragma Export (Ada, pd); pragma Export (Ada, pf); pragma Export (Ada, pg); -- These are like the Debug_Output_D/F/G procedures except that they -- output a line return after the output. They were originally present -- for direct use in GDB before GDB recognized Vax floating-point -- types, and are retained for backwards compatibility. private pragma Inline_Always (D_To_G); pragma Inline_Always (F_To_G); pragma Inline_Always (F_To_Q); pragma Inline_Always (F_To_S); pragma Inline_Always (G_To_D); pragma Inline_Always (G_To_F); pragma Inline_Always (G_To_Q); pragma Inline_Always (G_To_T); pragma Inline_Always (Q_To_F); pragma Inline_Always (Q_To_G); pragma Inline_Always (S_To_F); pragma Inline_Always (T_To_G); pragma Inline_Always (Abs_F); pragma Inline_Always (Abs_G); pragma Inline_Always (Add_F); pragma Inline_Always (Add_G); pragma Inline_Always (Div_G); pragma Inline_Always (Div_F); pragma Inline_Always (Mul_F); pragma Inline_Always (Mul_G); pragma Inline_Always (Neg_G); pragma Inline_Always (Neg_F); pragma Inline_Always (Return_D); pragma Inline_Always (Return_F); pragma Inline_Always (Return_G); pragma Inline_Always (Sub_F); pragma Inline_Always (Sub_G); pragma Inline_Always (Eq_F); pragma Inline_Always (Eq_G); pragma Inline_Always (Le_F); pragma Inline_Always (Le_G); pragma Inline_Always (Lt_F); pragma Inline_Always (Lt_G); pragma Inline_Always (Ne_F); pragma Inline_Always (Ne_G); pragma Inline_Always (Valid_D); pragma Inline_Always (Valid_F); pragma Inline_Always (Valid_G); end System.Vax_Float_Operations;
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