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--- Ada bindings for GCC internals.
--- Copyright (C) 2002, 2003, 2004, 2005 Tristan Gingold
---
--- GHDL is free software; you can redistribute it and/or modify it under
--- the terms of the GNU General Public License as published by the Free
--- Software Foundation; either version 2, or (at your option) any later
--- version.
---
--- GHDL is distributed in the hope that it will be useful, but WITHOUT ANY
--- WARRANTY; without even the implied warranty of MERCHANTABILITY or
--- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
--- for more details.
---
--- You should have received a copy of the GNU General Public License
--- along with GCC; see the file COPYING. If not, write to the Free
--- Software Foundation, 59 Temple Place - Suite 330, Boston, MA
--- 02111-1307, USA.
-with Ada.Unchecked_Conversion;
-with Agcc.Hconfig; use Agcc.Hconfig;
-with Agcc.Machmode; use Agcc.Machmode;
-
-package body Agcc.Autils is
- Arr_Len : constant Natural := Unsigned_64'Size / HOST_WIDE_INT'Size;
- type Arr_Conv is array (Natural range 0 .. Arr_Len - 1) of HOST_WIDE_INT;
-
- subtype Assert_Type is Boolean range True .. True;
- Assert_Arr_Len_Is_1_Or_2 : constant Assert_Type :=
- Arr_Len = 1 or Arr_Len = 2;
- pragma Unreferenced (Assert_Arr_Len_Is_1_Or_2);
-
- procedure To_Host_Wide_Int (V : Unsigned_64; L, H : out HOST_WIDE_INT) is
- function Unchecked_Conversion is new Ada.Unchecked_Conversion
- (Source => Unsigned_64, Target => Arr_Conv);
- Res : Arr_Conv;
- begin
- Res := Unchecked_Conversion (V);
- if Arr_Len = 1 then
- H := 0;
- L := Res (0);
- else
- if HOST_WORDS_BIG_ENDIAN then
- L := Res (1);
- H := Res (0);
- else
- L := Res (0);
- H := Res (1);
- end if;
- end if;
- end To_Host_Wide_Int;
-
- procedure To_Host_Wide_Int (V : Integer_64; L, H : out HOST_WIDE_INT) is
- function Unchecked_Conversion is new Ada.Unchecked_Conversion
- (Source => Integer_64, Target => Arr_Conv);
- Res : Arr_Conv;
- begin
- Res := Unchecked_Conversion (V);
- if Arr_Len = 1 then
- if V < 0 then
- H := -1;
- else
- H := 0;
- end if;
- L := Res (0);
- else
- if HOST_WORDS_BIG_ENDIAN then
- L := Res (1);
- H := Res (0);
- else
- L := Res (0);
- H := Res (1);
- end if;
- end if;
- end To_Host_Wide_Int;
-
- function To_Real_Value_Type (V : IEEE_Float_64) return REAL_VALUE_TYPE
- is
- Mant_Size : constant Natural := 60;
- Rfract : IEEE_Float_64;
- Fract : Integer_64;
- Exp : Integer;
- L, H : HOST_WIDE_INT;
- Mantisse : REAL_VALUE_TYPE;
- begin
- -- Note: this works only when REAL_ARITHMETIC is defined!!!
- Exp := IEEE_Float_64'Exponent (V);
- Rfract := IEEE_Float_64'Fraction (V);
- Rfract := IEEE_Float_64'Scaling (Rfract, Mant_Size);
- Fract := Integer_64 (Rfract);
- To_Host_Wide_Int (Fract, L, H);
- REAL_VALUE_FROM_INT (Mantisse'Address, L, H, DFmode);
- return REAL_VALUE_LDEXP (Mantisse, Exp - Mant_Size);
- end To_Real_Value_Type;
-end Agcc.Autils;