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-- This -*- vhdl -*- file is part of GHDL.
-- IEEE 1076.3 compliant numeric bit package.
-- Copyright (C) 2015 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 COPYING2. If not see
-- <http://www.gnu.org/licenses/>.
package NUMERIC_BIT is
type UNSIGNED is array (natural range <>) of BIT;
type SIGNED is array (natural range <>) of BIT;
function TO_INTEGER (ARG : UNSIGNED) return NATURAL;
function TO_INTEGER (ARG : SIGNED) return INTEGER;
-- Convert ARG to an integer.
-- Simulation is aborted in case of overflow.
-- Issue a warning in case of non-logical value.
function TO_UNSIGNED (ARG, SIZE : NATURAL) return UNSIGNED;
-- Convert ARG to unsigned.
-- Result index range is SIZE - 1 downto 0.
-- Issue a warning if value is truncated.
function TO_SIGNED (ARG : INTEGER; SIZE : NATURAL) return SIGNED;
-- Convert ARG to signed.
-- Result index range is SIZE - 1 downto 0.
-- Issue a warning if value is truncated.
function resize (ARG : UNSIGNED; NEW_SIZE: natural) return UNSIGNED;
function resize (ARG : SIGNED; NEW_SIZE: natural) return SIGNED;
-- Result index range is NEW_SIZE - 1 downto 0 (unless null array).
-- For SIGNED, the sign of the result is the sign of ARG.
function "=" (L : UNSIGNED; R : UNSIGNED) return BOOLEAN;
function "=" (L : UNSIGNED; R : NATURAL) return BOOLEAN;
function "=" (L : NATURAL; R : UNSIGNED) return BOOLEAN;
function "/=" (L : UNSIGNED; R : UNSIGNED) return BOOLEAN;
function "/=" (L : UNSIGNED; R : NATURAL) return BOOLEAN;
function "/=" (L : NATURAL; R : UNSIGNED) return BOOLEAN;
function "<" (L : UNSIGNED; R : UNSIGNED) return BOOLEAN;
function "<" (L : UNSIGNED; R : NATURAL) return BOOLEAN;
function "<" (L : NATURAL; R : UNSIGNED) return BOOLEAN;
function "<=" (L : UNSIGNED; R : UNSIGNED) return BOOLEAN;
function "<=" (L : UNSIGNED; R : NATURAL) return BOOLEAN;
function "<=" (L : NATURAL; R : UNSIGNED) return BOOLEAN;
function ">" (L : UNSIGNED; R : UNSIGNED) return BOOLEAN;
function ">" (L : UNSIGNED; R : NATURAL) return BOOLEAN;
function ">" (L : NATURAL; R : UNSIGNED) return BOOLEAN;
function ">=" (L : UNSIGNED; R : UNSIGNED) return BOOLEAN;
function ">=" (L : UNSIGNED; R : NATURAL) return BOOLEAN;
function ">=" (L : NATURAL; R : UNSIGNED) return BOOLEAN;
function "=" (L : SIGNED; R : SIGNED) return BOOLEAN;
function "=" (L : SIGNED; R : INTEGER) return BOOLEAN;
function "=" (L : INTEGER; R : SIGNED) return BOOLEAN;
function "/=" (L : SIGNED; R : SIGNED) return BOOLEAN;
function "/=" (L : SIGNED; R : INTEGER) return BOOLEAN;
function "/=" (L : INTEGER; R : SIGNED) return BOOLEAN;
function "<" (L : SIGNED; R : SIGNED) return BOOLEAN;
function "<" (L : SIGNED; R : INTEGER) return BOOLEAN;
function "<" (L : INTEGER; R : SIGNED) return BOOLEAN;
function "<=" (L : SIGNED; R : SIGNED) return BOOLEAN;
function "<=" (L : SIGNED; R : INTEGER) return BOOLEAN;
function "<=" (L : INTEGER; R : SIGNED) return BOOLEAN;
function ">" (L : SIGNED; R : SIGNED) return BOOLEAN;
function ">" (L : SIGNED; R : INTEGER) return BOOLEAN;
function ">" (L : INTEGER; R : SIGNED) return BOOLEAN;
function ">=" (L : SIGNED; R : SIGNED) return BOOLEAN;
function ">=" (L : SIGNED; R : INTEGER) return BOOLEAN;
function ">=" (L : INTEGER; R : SIGNED) return BOOLEAN;
-- Issue a warning in case of non-logical value.
function "-" (ARG : SIGNED) return SIGNED;
-- Compute -ARG.
-- Result index range is Arg'length - 1 downto 0.
function "abs" (ARG : SIGNED) return SIGNED;
-- Compute abs ARG.
-- Result index range is Arg'length - 1 downto 0.
function "+" (L : UNSIGNED; R : UNSIGNED) return UNSIGNED;
function "+" (L : SIGNED; R : SIGNED) return SIGNED;
function "-" (L : UNSIGNED; R : UNSIGNED) return UNSIGNED;
function "-" (L : SIGNED; R : SIGNED) return SIGNED;
-- Compute L +/- R.
-- Result index range is max (L'Length, R'Length) - 1 downto 0.
-- Issue a warning in case of non-logical value.
function "+" (L : UNSIGNED; R : NATURAL) return UNSIGNED;
function "+" (L : NATURAL; R : UNSIGNED) return UNSIGNED;
function "+" (L : SIGNED; R : INTEGER) return SIGNED;
function "+" (L : INTEGER; R : SIGNED) return SIGNED;
function "-" (L : UNSIGNED; R : NATURAL) return UNSIGNED;
function "-" (L : NATURAL; R : UNSIGNED) return UNSIGNED;
function "-" (L : SIGNED; R : INTEGER) return SIGNED;
function "-" (L : INTEGER; R : SIGNED) return SIGNED;
-- Compute L +/- R.
-- Result index range is V'Length - 1 downto 0, where V is the vector
-- parameter.
-- Issue a warning in case of non-logical value.
-- Issue a warning if value is truncated.
function "*" (L : UNSIGNED; R : UNSIGNED) return UNSIGNED;
function "*" (L : SIGNED; R : SIGNED) return SIGNED;
-- Compute L * R
-- Result index range is L'Length + R'Length - 1 downto 0.
function "*" (L : UNSIGNED; R : NATURAL) return UNSIGNED;
function "*" (L : SIGNED; R : INTEGER) return SIGNED;
-- Compute L * R
-- R is converted to a vector of length L'length
function "*" (L : NATURAL; R : UNSIGNED) return UNSIGNED;
function "*" (L : INTEGER; R : SIGNED) return SIGNED;
-- Compute L * R
-- L is converted to a vector of length R'length
function "/" (L : UNSIGNED; R : UNSIGNED) return UNSIGNED;
function "/" (L : SIGNED; R : SIGNED) return SIGNED;
function "rem" (L : UNSIGNED; R : UNSIGNED) return UNSIGNED;
function "rem" (L : SIGNED; R : SIGNED) return SIGNED;
function "mod" (L : UNSIGNED; R : UNSIGNED) return UNSIGNED;
function "mod" (L : SIGNED; R : SIGNED) return SIGNED;
-- Compute L op R
-- Result index range is L'Length - 1 downto 0.
-- Issue a warning in case of non-logical value.
-- Issue an error if R is 0.
function "/" (L : UNSIGNED; R : NATURAL) return UNSIGNED;
function "/" (L : SIGNED; R : INTEGER) return SIGNED;
function "rem" (L : UNSIGNED; R : NATURAL) return UNSIGNED;
function "rem" (L : SIGNED; R : INTEGER) return SIGNED;
function "mod" (L : UNSIGNED; R : NATURAL) return UNSIGNED;
function "mod" (L : SIGNED; R : INTEGER) return SIGNED;
-- Compute L op R.
-- Result index range is L'Length - 1 downto 0.
-- Issue a warning in case of non-logical value.
-- Issue an error if R is 0.
function "/" (L : NATURAL; R : UNSIGNED) return UNSIGNED;
function "/" (L : INTEGER; R : SIGNED) return SIGNED;
function "rem" (L : NATURAL; R : UNSIGNED) return UNSIGNED;
function "rem" (L : INTEGER; R : SIGNED) return SIGNED;
function "mod" (L : NATURAL; R : UNSIGNED) return UNSIGNED;
function "mod" (L : INTEGER; R : SIGNED) return SIGNED;
-- Compute L op R.
-- Result index range is R'Length - 1 downto 0.
-- Issue a warning in case of non-logical value.
-- Issue an error if R is 0.
-- Result may be truncated.
function "not" (l : UNSIGNED) return UNSIGNED;
function "not" (l : SIGNED) return SIGNED;
function "and" (l, r : UNSIGNED) return UNSIGNED;
function "and" (l, r : SIGNED) return SIGNED;
function "nand" (l, r : UNSIGNED) return UNSIGNED;
function "nand" (l, r : SIGNED) return SIGNED;
function "or" (l, r : UNSIGNED) return UNSIGNED;
function "or" (l, r : SIGNED) return SIGNED;
function "nor" (l, r : UNSIGNED) return UNSIGNED;
function "nor" (l, r : SIGNED) return SIGNED;
function "xor" (l, r : UNSIGNED) return UNSIGNED;
function "xor" (l, r : SIGNED) return SIGNED;
function "xnor" (l, r : UNSIGNED) return UNSIGNED;
function "xnor" (l, r : SIGNED) return SIGNED;
-- Compute L OP R.
-- Result index range is L'Length - 1 downto 0.
-- No specific handling of null array: the index range of the result
-- would be -1 downto 0 (without warning). This it not what is specified
-- in 1076.3, but corresponds to the standard implementation.
-- No specific handling of non-logical values. Behaviour is compatible
-- with std_logic_1164.
function shift_left (ARG : UNSIGNED; COUNT: NATURAL) return UNSIGNED;
function shift_left (ARG : SIGNED; COUNT: NATURAL) return SIGNED;
function shift_right (ARG : UNSIGNED; COUNT: NATURAL) return UNSIGNED;
function shift_right (ARG : SIGNED; COUNT: NATURAL) return SIGNED;
-- Result index range is ARG'Length - 1 downto 0.
function rotate_left (ARG : UNSIGNED; COUNT: NATURAL) return UNSIGNED;
function rotate_left (ARG : SIGNED; COUNT: NATURAL) return SIGNED;
function rotate_right (ARG : UNSIGNED; COUNT: NATURAL) return UNSIGNED;
function rotate_right (ARG : SIGNED; COUNT: NATURAL) return SIGNED;
-- Result index range is ARG'Length - 1 downto 0.
end NUMERIC_BIT;
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