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-- Copyright (C) 1996 Morgan Kaufmann Publishers, Inc
-- This file is part of VESTs (Vhdl tESTs).
-- VESTs 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 of the License, or (at
-- your option) any later version.
-- VESTs 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 VESTs; if not, write to the Free Software Foundation,
-- Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-- ---------------------------------------------------------------------
--
-- $Id: bv_arithmetic.vhd,v 1.2 2001-10-25 01:24:24 paw Exp $
-- $Revision: 1.2 $
--
-- ---------------------------------------------------------------------
--------------------------------------------------------------------------
--
-- Bit-vector arithmetic package interface.
--
-- Does arithmetic and logical operations on bit vectors, treating them
-- as either unsigned or signed (two's complement) integers. Leftmost bit
-- is most-significant or sign bit, rightmost bit is least-significant
-- bit. Dyadic operations need the two arguments to be of the same
-- length; however, their index ranges and directions may differ. Results
-- must be of the same length as the operands.
--
--------------------------------------------------------------------------
package bv_arithmetic is
function bv_to_natural ( bv : in bit_vector ) return natural;
function natural_to_bv ( nat : in natural;
length : in natural ) return bit_vector;
function bv_to_integer ( bv : in bit_vector ) return integer;
function integer_to_bv ( int : in integer;
length : in natural ) return bit_vector;
procedure bv_add ( bv1, bv2 : in bit_vector;
bv_result : out bit_vector;
overflow : out boolean );
function "+" ( bv1, bv2 : in bit_vector ) return bit_vector;
procedure bv_sub ( bv1, bv2 : in bit_vector;
bv_result : out bit_vector;
overflow : out boolean );
function "-" ( bv1, bv2 : in bit_vector ) return bit_vector;
procedure bv_addu ( bv1, bv2 : in bit_vector;
bv_result : out bit_vector;
overflow : out boolean );
function bv_addu ( bv1, bv2 : in bit_vector ) return bit_vector;
procedure bv_subu ( bv1, bv2 : in bit_vector;
bv_result : out bit_vector;
overflow : out boolean );
function bv_subu ( bv1, bv2 : in bit_vector ) return bit_vector;
procedure bv_neg ( bv : in bit_vector;
bv_result : out bit_vector;
overflow : out boolean );
function "-" ( bv : in bit_vector ) return bit_vector;
procedure bv_mult ( bv1, bv2 : in bit_vector;
bv_result : out bit_vector;
overflow : out boolean );
function "*" ( bv1, bv2 : in bit_vector ) return bit_vector;
procedure bv_multu ( bv1, bv2 : in bit_vector;
bv_result : out bit_vector;
overflow : out boolean );
function bv_multu ( bv1, bv2 : in bit_vector ) return bit_vector;
procedure bv_div ( bv1, bv2 : in bit_vector;
bv_result : out bit_vector;
div_by_zero : out boolean;
overflow : out boolean );
function "/" ( bv1, bv2 : in bit_vector ) return bit_vector;
procedure bv_divu ( bv1, bv2 : in bit_vector;
bv_quotient : out bit_vector;
bv_remainder : out bit_vector;
div_by_zero : out boolean );
procedure bv_divu ( bv1, bv2 : in bit_vector;
bv_quotient : out bit_vector;
div_by_zero : out boolean );
function bv_divu ( bv1, bv2 : in bit_vector ) return bit_vector;
function bv_lt ( bv1, bv2 : in bit_vector ) return boolean;
function bv_le ( bv1, bv2 : in bit_vector ) return boolean;
function bv_gt ( bv1, bv2 : in bit_vector ) return boolean;
function bv_ge ( bv1, bv2 : in bit_vector ) return boolean;
function bv_sext ( bv : in bit_vector;
length : in natural ) return bit_vector;
function bv_zext ( bv : in bit_vector;
length : in natural ) return bit_vector;
end package bv_arithmetic;
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