329 lines
11 KiB
Ada
329 lines
11 KiB
Ada
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------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME COMPONENTS --
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-- --
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-- S Y S T E M . S C A L A R _ V A L U E S --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 2003-2009, 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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with Ada.Unchecked_Conversion;
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package body System.Scalar_Values is
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----------------
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-- Initialize --
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----------------
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procedure Initialize (Mode1 : Character; Mode2 : Character) is
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C1 : Character := Mode1;
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C2 : Character := Mode2;
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procedure Get_Env_Value_Ptr (Name, Length, Ptr : Address);
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pragma Import (C, Get_Env_Value_Ptr, "__gnat_getenv");
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subtype String2 is String (1 .. 2);
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type String2_Ptr is access all String2;
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Env_Value_Ptr : aliased String2_Ptr;
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Env_Value_Length : aliased Integer;
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EV_Val : aliased constant String :=
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"GNAT_INIT_SCALARS" & ASCII.NUL;
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B : Byte1;
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EFloat : constant Boolean := Long_Long_Float'Size > Long_Float'Size;
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-- Set True if we are on an x86 with 96-bit floats for extended
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AFloat : constant Boolean :=
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Long_Float'Size = 48 and then Long_Long_Float'Size = 48;
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-- Set True if we are on an AAMP with 48-bit extended floating point
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type ByteLF is array (0 .. 7 - 2 * Boolean'Pos (AFloat)) of Byte1;
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for ByteLF'Component_Size use 8;
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-- Type used to hold Long_Float values on all targets and to initialize
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-- 48-bit Long_Float values used on AAMP. On AAMP, this type is 6 bytes.
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-- On other targets the type is 8 bytes, and type Byte8 is used for
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-- values that are then converted to ByteLF.
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pragma Warnings (Off); -- why ???
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function To_ByteLF is new Ada.Unchecked_Conversion (Byte8, ByteLF);
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pragma Warnings (On);
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type ByteLLF is
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array (0 .. 7 + 4 * Boolean'Pos (EFloat) - 2 * Boolean'Pos (AFloat))
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of Byte1;
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for ByteLLF'Component_Size use 8;
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-- Type used to initialize Long_Long_Float values used on x86 and
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-- any other target with the same 80-bit floating-point values that
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-- GCC always stores in 96-bits. Note that we are assuming Intel
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-- format little-endian addressing for this type. On non-Intel
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-- architectures, this is the same length as Byte8 and holds
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-- a Long_Float value.
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-- The following variables are used to initialize the float values
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-- by overlay. We can't assign directly to the float values, since
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-- we may be assigning signalling Nan's that will cause a trap if
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-- loaded into a floating-point register.
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IV_Isf : aliased Byte4; -- Initialize short float
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IV_Ifl : aliased Byte4; -- Initialize float
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IV_Ilf : aliased ByteLF; -- Initialize long float
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IV_Ill : aliased ByteLLF; -- Initialize long long float
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for IV_Isf'Address use IS_Isf'Address;
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for IV_Ifl'Address use IS_Ifl'Address;
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for IV_Ilf'Address use IS_Ilf'Address;
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for IV_Ill'Address use IS_Ill'Address;
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-- The following pragmas are used to suppress initialization
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pragma Import (Ada, IV_Isf);
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pragma Import (Ada, IV_Ifl);
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pragma Import (Ada, IV_Ilf);
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pragma Import (Ada, IV_Ill);
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begin
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-- Acquire environment variable value if necessary
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if C1 = 'E' and then C2 = 'V' then
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Get_Env_Value_Ptr
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(EV_Val'Address, Env_Value_Length'Address, Env_Value_Ptr'Address);
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-- Ignore if length is not 2
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if Env_Value_Length /= 2 then
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C1 := 'I';
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C2 := 'N';
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-- Length is 2, see if it is a valid value
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else
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-- Acquire two characters and fold to upper case
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C1 := Env_Value_Ptr (1);
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C2 := Env_Value_Ptr (2);
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if C1 in 'a' .. 'z' then
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C1 := Character'Val (Character'Pos (C1) - 32);
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end if;
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if C2 in 'a' .. 'z' then
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C2 := Character'Val (Character'Pos (C2) - 32);
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end if;
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-- IN/LO/HI are ok values
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if (C1 = 'I' and then C2 = 'N')
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or else
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(C1 = 'L' and then C2 = 'O')
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or else
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(C1 = 'H' and then C2 = 'I')
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then
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null;
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-- Try for valid hex digits
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elsif (C1 in '0' .. '9' or else C1 in 'A' .. 'Z')
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or else
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(C2 in '0' .. '9' or else C2 in 'A' .. 'Z')
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then
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null;
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-- Otherwise environment value is bad, ignore and use IN (invalid)
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else
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C1 := 'I';
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C2 := 'N';
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end if;
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end if;
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end if;
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-- IN (invalid value)
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if C1 = 'I' and then C2 = 'N' then
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IS_Is1 := 16#80#;
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IS_Is2 := 16#8000#;
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IS_Is4 := 16#8000_0000#;
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IS_Is8 := 16#8000_0000_0000_0000#;
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IS_Iu1 := 16#FF#;
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IS_Iu2 := 16#FFFF#;
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IS_Iu4 := 16#FFFF_FFFF#;
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IS_Iu8 := 16#FFFF_FFFF_FFFF_FFFF#;
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IS_Iz1 := 16#00#;
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IS_Iz2 := 16#0000#;
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IS_Iz4 := 16#0000_0000#;
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IS_Iz8 := 16#0000_0000_0000_0000#;
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if AFloat then
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IV_Isf := 16#FFFF_FF00#;
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IV_Ifl := 16#FFFF_FF00#;
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IV_Ilf := (0, 16#FF#, 16#FF#, 16#FF#, 16#FF#, 16#FF#);
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else
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IV_Isf := IS_Iu4;
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IV_Ifl := IS_Iu4;
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IV_Ilf := To_ByteLF (IS_Iu8);
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end if;
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if EFloat then
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IV_Ill := (0, 0, 0, 0, 0, 0, 0, 16#C0#, 16#FF#, 16#FF#, 0, 0);
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end if;
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-- LO (Low values)
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elsif C1 = 'L' and then C2 = 'O' then
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IS_Is1 := 16#80#;
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IS_Is2 := 16#8000#;
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IS_Is4 := 16#8000_0000#;
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IS_Is8 := 16#8000_0000_0000_0000#;
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IS_Iu1 := 16#00#;
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IS_Iu2 := 16#0000#;
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IS_Iu4 := 16#0000_0000#;
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IS_Iu8 := 16#0000_0000_0000_0000#;
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IS_Iz1 := 16#00#;
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IS_Iz2 := 16#0000#;
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IS_Iz4 := 16#0000_0000#;
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IS_Iz8 := 16#0000_0000_0000_0000#;
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if AFloat then
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IV_Isf := 16#0000_0001#;
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IV_Ifl := 16#0000_0001#;
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IV_Ilf := (1, 0, 0, 0, 0, 0);
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else
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IV_Isf := 16#FF80_0000#;
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IV_Ifl := 16#FF80_0000#;
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IV_Ilf := To_ByteLF (16#FFF0_0000_0000_0000#);
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end if;
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if EFloat then
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IV_Ill := (0, 0, 0, 0, 0, 0, 0, 16#80#, 16#FF#, 16#FF#, 0, 0);
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end if;
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-- HI (High values)
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elsif C1 = 'H' and then C2 = 'I' then
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IS_Is1 := 16#7F#;
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IS_Is2 := 16#7FFF#;
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IS_Is4 := 16#7FFF_FFFF#;
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IS_Is8 := 16#7FFF_FFFF_FFFF_FFFF#;
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IS_Iu1 := 16#FF#;
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IS_Iu2 := 16#FFFF#;
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IS_Iu4 := 16#FFFF_FFFF#;
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IS_Iu8 := 16#FFFF_FFFF_FFFF_FFFF#;
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IS_Iz1 := 16#FF#;
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IS_Iz2 := 16#FFFF#;
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IS_Iz4 := 16#FFFF_FFFF#;
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IS_Iz8 := 16#FFFF_FFFF_FFFF_FFFF#;
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if AFloat then
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IV_Isf := 16#7FFF_FFFF#;
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IV_Ifl := 16#7FFF_FFFF#;
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IV_Ilf := (16#FF#, 16#FF#, 16#FF#, 16#FF#, 16#FF#, 16#7F#);
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else
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IV_Isf := 16#7F80_0000#;
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IV_Ifl := 16#7F80_0000#;
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IV_Ilf := To_ByteLF (16#7FF0_0000_0000_0000#);
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end if;
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if EFloat then
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IV_Ill := (0, 0, 0, 0, 0, 0, 0, 16#80#, 16#FF#, 16#7F#, 0, 0);
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end if;
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-- -Shh (hex byte)
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else
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-- Convert the two hex digits (we know they are valid here)
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B := 16 * (Character'Pos (C1)
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- (if C1 in '0' .. '9'
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then Character'Pos ('0')
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else Character'Pos ('A') - 10))
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+ (Character'Pos (C2)
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- (if C2 in '0' .. '9'
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then Character'Pos ('0')
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else Character'Pos ('A') - 10));
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-- Initialize data values from the hex value
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IS_Is1 := B;
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IS_Is2 := 2**8 * Byte2 (IS_Is1) + Byte2 (IS_Is1);
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IS_Is4 := 2**16 * Byte4 (IS_Is2) + Byte4 (IS_Is2);
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IS_Is8 := 2**32 * Byte8 (IS_Is4) + Byte8 (IS_Is4);
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IS_Iu1 := IS_Is1;
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IS_Iu2 := IS_Is2;
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IS_Iu4 := IS_Is4;
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IS_Iu8 := IS_Is8;
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IS_Iz1 := IS_Is1;
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IS_Iz2 := IS_Is2;
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IS_Iz4 := IS_Is4;
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IS_Iz8 := IS_Is8;
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IV_Isf := IS_Is4;
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IV_Ifl := IS_Is4;
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if AFloat then
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IV_Ill := (B, B, B, B, B, B);
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else
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IV_Ilf := To_ByteLF (IS_Is8);
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end if;
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if EFloat then
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IV_Ill := (B, B, B, B, B, B, B, B, B, B, B, B);
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end if;
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end if;
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-- If no separate Long_Long_Float, then use Long_Float value as
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-- Long_Long_Float initial value.
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if not EFloat then
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declare
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pragma Warnings (Off); -- why???
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function To_ByteLLF is
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new Ada.Unchecked_Conversion (ByteLF, ByteLLF);
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pragma Warnings (On);
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begin
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IV_Ill := To_ByteLLF (IV_Ilf);
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end;
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end if;
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end Initialize;
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end System.Scalar_Values;
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