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