-- --------------------------------------------------------------------
--
--
-- Copyright©2004 by the Institute of Electrical and Electronics Engineers, Inc.
-- Three Park Avenue
-- New York, NY 10016-5997, USA
-- All rights reserved.
-- 
-- This document is an unapproved draft of a proposed IEEE Standard. As such,
-- this document is subject to change. USE AT YOUR OWN RISK! Because this
--  is an unapproved draft, this document must not be utilized for any 
-- conformance/compliance purposes. Permission is hereby granted for IEEE 
-- Standards Committee participants to reproduce this document for purposes 
-- of IEEE standardization activities only. Prior to submitting this document 
-- to another standards development organization for standardization 
-- activities, permission must first be obtained from the Manager, Standards 
-- Licensing and Contracts, IEEE Standards Activities Department. Other 
-- entities seeking permission to reproduce this document, in whole or in 
-- part, must obtain permission from the Manager, Standards Licensing and 
-- Contracts, IEEE Standard Activities Department.
--
-- IEEE Standards Activities Department
-- Standards Licensing and Contracts
-- 445 Hoes Lane, P.O. Box 1331
-- Piscataway, NJ 08855-1331, USA

-- --------------------------------------------------------------------
-- Title      : Standard VHDL Synthesis Package (1076.3, NUMERIC_BIT_UNSIGNED)
--
--             This is the updated (proposed) new package to be
--             balloted in January.
--
--             New subprograms are at the end of the package header
--             and the package body. These are to be revised, ID's
--             assigned, and voted into the ballot version.
--              
--             Other changes will be noted here.
--
-- Version: $Revision: 1.1 $
-- Date: $Date: 2006-06-08 10:34:35-04 $
--
--  Created for VHDL-200X-ft, David Bishop (dbishop@vhdl.org) 
-- -----------------------------------------------------------------------------

package NUMERIC_BIT_UNSIGNED is
  constant CopyRightNotice : STRING :=
    "Copyright 2006 IEEE. All rights reserved.";

  -- Id: A.3
  function "+" (L, R : BIT_VECTOR) return BIT_VECTOR;
  -- Result subtype: bit_vector(MAXIMUM(L'LENGTH, R'LENGTH)-1 downto 0).
  -- Result: Adds two UNSIGNED vectors that may be of different lengths.

  -- Id: A.3R
  function "+"(L : BIT_VECTOR; R : BIT) return BIT_VECTOR;
  -- Result subtype: bit_vector(L'LENGTH-1 downto 0)
  -- Result: Similar to A.3 where R is a one bit bit_vector

  -- Id: A.3L
  function "+"(L : BIT; R : BIT_VECTOR) return BIT_VECTOR;
  -- Result subtype: bit_vector(R'LENGTH-1 downto 0)
  -- Result: Similar to A.3 where L is a one bit UNSIGNED

  -- Id: A.5
  function "+" (L : BIT_VECTOR; R : NATURAL) return BIT_VECTOR;
  -- Result subtype: bit_vector(L'LENGTH-1 downto 0).
  -- Result: Adds an UNSIGNED vector, L, with a non-negative INTEGER, R.

  -- Id: A.6
  function "+" (L : NATURAL; R : BIT_VECTOR) return BIT_VECTOR;
  -- Result subtype: bit_vector(R'LENGTH-1 downto 0).
  -- Result: Adds a non-negative INTEGER, L, with an UNSIGNED vector, R.

  --============================================================================

  -- Id: A.9
  function "-" (L, R : BIT_VECTOR) return BIT_VECTOR;
  -- Result subtype: UNSIGNED(MAXIMUM(L'LENGTH, R'LENGTH)-1 downto 0).
  -- Result: Subtracts two UNSIGNED vectors that may be of different lengths.

  -- Id: A.9R
  function "-"(L : BIT_VECTOR; R : BIT) return BIT_VECTOR;
  -- Result subtype: bit_vector(L'LENGTH-1 downto 0)
  -- Result: Similar to A.9 where R is a one bit UNSIGNED

  -- Id: A.9L
  function "-"(L : BIT; R : BIT_VECTOR) return BIT_VECTOR;
  -- Result subtype: bit_vector(R'LENGTH-1 downto 0)
  -- Result: Similar to A.9 where L is a one bit UNSIGNED

  -- Id: A.11
  function "-" (L : BIT_VECTOR; R : NATURAL) return BIT_VECTOR;
  -- Result subtype: bit_vector(L'LENGTH-1 downto 0).
  -- Result: Subtracts a non-negative INTEGER, R, from an UNSIGNED vector, L.

  -- Id: A.12
  function "-" (L : NATURAL; R : BIT_VECTOR) return BIT_VECTOR;
  -- Result subtype: bit_vector(R'LENGTH-1 downto 0).
  -- Result: Subtracts an UNSIGNED vector, R, from a non-negative INTEGER, L.

  --============================================================================

  -- Id: A.15
  function "*" (L, R : BIT_VECTOR) return BIT_VECTOR;
  -- Result subtype: bit_vector((L'LENGTH+R'LENGTH-1) downto 0).
  -- Result: Performs the multiplication operation on two UNSIGNED vectors
  --         that may possibly be of different lengths.

  -- Id: A.17
  function "*" (L : BIT_VECTOR; R : NATURAL) return BIT_VECTOR;
  -- Result subtype: bit_vector((L'LENGTH+L'LENGTH-1) downto 0).
  -- Result: Multiplies an UNSIGNED vector, L, with a non-negative
  --         INTEGER, R. R is converted to an UNSIGNED vector of
  --         SIZE L'LENGTH before multiplication.

  -- Id: A.18
  function "*" (L : NATURAL; R : BIT_VECTOR) return BIT_VECTOR;
  -- Result subtype: bit_vector((R'LENGTH+R'LENGTH-1) downto 0).
  -- Result: Multiplies an UNSIGNED vector, R, with a non-negative
  --         INTEGER, L. L is converted to an UNSIGNED vector of
  --         SIZE R'LENGTH before multiplication.

  --============================================================================
  --
  -- NOTE: If second argument is zero for "/" operator, a severity level
  --       of ERROR is issued.

  -- Id: A.21
  function "/" (L, R : BIT_VECTOR) return BIT_VECTOR;
  -- Result subtype: bit_vector(L'LENGTH-1 downto 0)
  -- Result: Divides an UNSIGNED vector, L, by another UNSIGNED vector, R.

  -- Id: A.23
  function "/" (L : BIT_VECTOR; R : NATURAL) return BIT_VECTOR;
  -- Result subtype: bit_vector(L'LENGTH-1 downto 0)
  -- Result: Divides an UNSIGNED vector, L, by a non-negative INTEGER, R.
  --         If NO_OF_BITS(R) > L'LENGTH, result is truncated to L'LENGTH.

  -- Id: A.24
  function "/" (L : NATURAL; R : BIT_VECTOR) return BIT_VECTOR;
  -- Result subtype: bit_vector(R'LENGTH-1 downto 0)
  -- Result: Divides a non-negative INTEGER, L, by an UNSIGNED vector, R.
  --         If NO_OF_BITS(L) > R'LENGTH, result is truncated to R'LENGTH.

  --============================================================================
  --
  -- NOTE: If second argument is zero for "rem" operator, a severity level
  --       of ERROR is issued.

  -- Id: A.27
  function "rem" (L, R : BIT_VECTOR) return BIT_VECTOR;
  -- Result subtype: bit_vector(R'LENGTH-1 downto 0)
  -- Result: Computes "L rem R" where L and R are UNSIGNED vectors.

  -- Id: A.29
  function "rem" (L : BIT_VECTOR; R : NATURAL) return BIT_VECTOR;
  -- Result subtype: bit_vector(L'LENGTH-1 downto 0)
  -- Result: Computes "L rem R" where L is an UNSIGNED vector and R is a
  --         non-negative INTEGER.
  --         If NO_OF_BITS(R) > L'LENGTH, result is truncated to L'LENGTH.

  -- Id: A.30
  function "rem" (L : NATURAL; R : BIT_VECTOR) return BIT_VECTOR;
  -- Result subtype: bit_vector(R'LENGTH-1 downto 0)
  -- Result: Computes "L rem R" where R is an UNSIGNED vector and L is a
  --         non-negative INTEGER.
  --         If NO_OF_BITS(L) > R'LENGTH, result is truncated to R'LENGTH.

  --============================================================================
  --
  -- NOTE: If second argument is zero for "mod" operator, a severity level
  --       of ERROR is issued.

  -- Id: A.33
  function "mod" (L, R : BIT_VECTOR) return BIT_VECTOR;
  -- Result subtype: bit_vector(R'LENGTH-1 downto 0)
  -- Result: Computes "L mod R" where L and R are UNSIGNED vectors.

  -- Id: A.35
  function "mod" (L : BIT_VECTOR; R : NATURAL) return BIT_VECTOR;
  -- Result subtype: bit_vector(L'LENGTH-1 downto 0)
  -- Result: Computes "L mod R" where L is an UNSIGNED vector and R
  --         is a non-negative INTEGER.
  --         If NO_OF_BITS(R) > L'LENGTH, result is truncated to L'LENGTH.

  -- Id: A.36
  function "mod" (L : NATURAL; R : BIT_VECTOR) return BIT_VECTOR;
  -- Result subtype: bit_vector(R'LENGTH-1 downto 0)
  -- Result: Computes "L mod R" where R is an UNSIGNED vector and L
  --         is a non-negative INTEGER.
  --         If NO_OF_BITS(L) > R'LENGTH, result is truncated to R'LENGTH.

-- begin LCS-2006-129
  --============================================================================
  -- Id: A.39
  function find_leftmost (ARG : BIT_VECTOR; Y : BIT) return INTEGER;
  -- Result subtype: INTEGER
  -- Result: Finds the leftmost occurrence of the value of Y in ARG.
  --         Returns the index of the occurrence if it exists, or -1 otherwise.

  -- Id: A.41
  function find_rightmost (ARG : BIT_VECTOR; Y : BIT) return INTEGER;
  -- Result subtype: INTEGER
  -- Result: Finds the leftmost occurrence of the value of Y in ARG.
  --         Returns the index of the occurrence if it exists, or -1 otherwise.

-- end LCS-2006-129
  --============================================================================
  -- Comparison Operators
  --============================================================================
  -- Id: C.1
  function ">" (L, R : BIT_VECTOR) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L > R" where L and R are UNSIGNED vectors possibly
  --         of different lengths.

  -- Id: C.3
  function ">" (L : NATURAL; R : BIT_VECTOR) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L > R" where L is a non-negative INTEGER and
  --         R is an UNSIGNED vector.

  -- Id: C.5
  function ">" (L : BIT_VECTOR; R : NATURAL) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L > R" where L is an UNSIGNED vector and
  --         R is a non-negative INTEGER.

  --============================================================================
  -- Id: C.7
  function "<" (L, R : BIT_VECTOR) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L < R" where L and R are UNSIGNED vectors possibly
  --         of different lengths.

  -- Id: C.9
  function "<" (L : NATURAL; R : BIT_VECTOR) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L < R" where L is a non-negative INTEGER and
  --         R is an UNSIGNED vector.

  -- Id: C.11
  function "<" (L : BIT_VECTOR; R : NATURAL) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L < R" where L is an UNSIGNED vector and
  --         R is a non-negative INTEGER.

  --============================================================================
  -- Id: C.13
  function "<=" (L, R : BIT_VECTOR) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L <= R" where L and R are UNSIGNED vectors possibly
  --         of different lengths.

  -- Id: C.15
  function "<=" (L : NATURAL; R : BIT_VECTOR) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L <= R" where L is a non-negative INTEGER and
  --         R is an UNSIGNED vector.

  -- Id: C.17
  function "<=" (L : BIT_VECTOR; R : NATURAL) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L <= R" where L is an UNSIGNED vector and
  --         R is a non-negative INTEGER.

  --============================================================================
  -- Id: C.19
  function ">=" (L, R : BIT_VECTOR) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L >= R" where L and R are UNSIGNED vectors possibly
  --         of different lengths.

  -- Id: C.21
  function ">=" (L : NATURAL; R : BIT_VECTOR) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L >= R" where L is a non-negative INTEGER and
  --         R is an UNSIGNED vector.

  -- Id: C.23
  function ">=" (L : BIT_VECTOR; R : NATURAL) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L >= R" where L is an UNSIGNED vector and
  --         R is a non-negative INTEGER.

  --============================================================================
  -- Id: C.25
  function "=" (L, R : BIT_VECTOR) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L = R" where L and R are UNSIGNED vectors possibly
  --         of different lengths.

  -- Id: C.27
  function "=" (L : NATURAL; R : BIT_VECTOR) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L = R" where L is a non-negative INTEGER and
  --         R is an UNSIGNED vector.

  -- Id: C.29
  function "=" (L : BIT_VECTOR; R : NATURAL) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L = R" where L is an UNSIGNED vector and
  --         R is a non-negative INTEGER.

  --============================================================================

  -- Id: C.31
  function "/=" (L, R : BIT_VECTOR) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L /= R" where L and R are UNSIGNED vectors possibly
  --         of different lengths.

  -- Id: C.33
  function "/=" (L : NATURAL; R : BIT_VECTOR) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L /= R" where L is a non-negative INTEGER and
  --         R is an UNSIGNED vector.

  -- Id: C.35
  function "/=" (L : BIT_VECTOR; R : NATURAL) return BOOLEAN;
  -- Result subtype: BOOLEAN
  -- Result: Computes "L /= R" where L is an UNSIGNED vector and
  --         R is a non-negative INTEGER.

  --============================================================================

  -- Id: C.37
  function MINIMUM (L, R : BIT_VECTOR) return BIT_VECTOR;
  -- Result subtype: BIT_VECTOR
  -- Result: Returns the lesser of two UNSIGNED vectors that may be
  --         of different lengths.

  -- Id: C.39
  function MINIMUM (L : NATURAL; R : BIT_VECTOR) return BIT_VECTOR;
  -- Result subtype: BIT_VECTOR
  -- Result: Returns the lesser of a nonnegative INTEGER, L, and
  --         an UNSIGNED vector, R.

  -- Id: C.41
  function MINIMUM (L : BIT_VECTOR; R : NATURAL) return BIT_VECTOR;
  -- Result subtype: BIT_VECTOR
  -- Result: Returns the lesser of an UNSIGNED vector, L, and
  --         a nonnegative INTEGER, R.

  --============================================================================

  -- Id: C.43
  function MAXIMUM (L, R : BIT_VECTOR) return BIT_VECTOR;
  -- Result subtype: BIT_VECTOR
  -- Result: Returns the greater of two UNSIGNED vectors that may be
  --         of different lengths.

  -- Id: C.45
  function MAXIMUM (L : NATURAL; R : BIT_VECTOR) return BIT_VECTOR;
  -- Result subtype: BIT_VECTOR
  -- Result: Returns the greater of a nonnegative INTEGER, L, and
  --         an UNSIGNED vector, R.

  -- Id: C.47
  function MAXIMUM (L : BIT_VECTOR; R : NATURAL) return BIT_VECTOR;
  -- Result subtype: BIT_VECTOR
  -- Result: Returns the greater of an UNSIGNED vector, L, and
  --         a nonnegative INTEGER, R.

  --============================================================================
  -- Id: C.49
  function "?>" (L, R : BIT_VECTOR) return BIT;
  -- Result subtype: BIT
  -- Result: Computes "L > R" where L and R are UNSIGNED vectors possibly
  --         of different lengths.

  -- Id: C.51
  function "?>" (L : NATURAL; R : BIT_VECTOR) return BIT;
  -- Result subtype: BIT
  -- Result: Computes "L > R" where L is a nonnegative INTEGER and
  --         R is an UNSIGNED vector.

  -- Id: C.53
  function "?>" (L : BIT_VECTOR; R : NATURAL) return BIT;
  -- Result subtype: BIT
  -- Result: Computes "L > R" where L is an UNSIGNED vector and
  --         R is a nonnegative INTEGER.

  --============================================================================

  -- Id: C.55
  function "?<" (L, R : BIT_VECTOR) return BIT;
  -- Result subtype: BIT
  -- Result: Computes "L < R" where L and R are UNSIGNED vectors possibly
  --         of different lengths.

  -- Id: C.57
  function "?<" (L : NATURAL; R : BIT_VECTOR) return BIT;
  -- Result subtype: BIT
  -- Result: Computes "L < R" where L is a nonnegative INTEGER and
  --         R is an UNSIGNED vector.

  -- Id: C.59
  function "?<" (L : BIT_VECTOR; R : NATURAL) return BIT;
  -- Result subtype: BIT
  -- Result: Computes "L < R" where L is an UNSIGNED vector and
  --         R is a nonnegative INTEGER.

  --============================================================================

  -- Id: C.61
  function "?<=" (L, R : BIT_VECTOR) return BIT;
  -- Result subtype: BIT
  -- Result: Computes "L <= R" where L and R are UNSIGNED vectors possibly
  --         of different lengths.

  -- Id: C.63
  function "?<=" (L : NATURAL; R : BIT_VECTOR) return BIT;
  -- Result subtype: BIT
  -- Result: Computes "L <= R" where L is a nonnegative INTEGER and
  --         R is an UNSIGNED vector.

  -- Id: C.65
  function "?<=" (L : BIT_VECTOR; R : NATURAL) return BIT;
  -- Result subtype: BIT
  -- Result: Computes "L <= R" where L is an UNSIGNED vector and
  --         R is a nonnegative INTEGER.

  --============================================================================

  -- Id: C.67
  function "?>=" (L, R : BIT_VECTOR) return BIT;
  -- Result subtype: BIT
  -- Result: Computes "L >= R" where L and R are UNSIGNED vectors possibly
  --         of different lengths.

  -- Id: C.69
  function "?>=" (L : NATURAL; R : BIT_VECTOR) return BIT;
  -- Result subtype: BIT
  -- Result: Computes "L >= R" where L is a nonnegative INTEGER and
  --         R is an UNSIGNED vector.

  -- Id: C.71
  function "?>=" (L : BIT_VECTOR; R : NATURAL) return BIT;
  -- Result subtype: BIT
  -- Result: Computes "L >= R" where L is an UNSIGNED vector and
  --         R is a nonnegative INTEGER.

  --============================================================================

  -- Id: C.73
  function "?=" (L, R : BIT_VECTOR) return BIT;
  -- Result subtype: BIT
  -- Result: Computes "L = R" where L and R are UNSIGNED vectors possibly
  --         of different lengths.

  -- Id: C.75
  function "?=" (L : NATURAL; R : BIT_VECTOR) return BIT;
  -- Result subtype: BIT
  -- Result: Computes "L = R" where L is a nonnegative INTEGER and
  --         R is an UNSIGNED vector.

  -- Id: C.77
  function "?=" (L : BIT_VECTOR; R : NATURAL) return BIT;
  -- Result subtype: BIT
  -- Result: Computes "L = R" where L is an UNSIGNED vector and
  --         R is a nonnegative INTEGER.

  --============================================================================

  -- Id: C.79
  function "?/=" (L, R : BIT_VECTOR) return BIT;
  -- Result subtype: BIT
  -- Result: Computes "L /= R" where L and R are UNSIGNED vectors possibly
  --         of different lengths.

  -- Id: C.81
  function "?/=" (L : NATURAL; R : BIT_VECTOR) return BIT;
  -- Result subtype: BIT
  -- Result: Computes "L /= R" where L is a nonnegative INTEGER and
  --         R is an UNSIGNED vector.

  -- Id: C.83
  function "?/=" (L : BIT_VECTOR; R : NATURAL) return BIT;
  -- Result subtype: BIT
  -- Result: Computes "L /= R" where L is an UNSIGNED vector and
  --         R is a nonnegative INTEGER.

  --============================================================================
  -- Shift and Rotate Functions
  --============================================================================

  -- Id: S.1
  function SHIFT_LEFT (ARG : BIT_VECTOR; COUNT : NATURAL) return BIT_VECTOR;
  -- Result subtype: bit_vector(ARG'LENGTH-1 downto 0)
  -- Result: Performs a shift-left on an UNSIGNED vector COUNT times.
  --         The vacated positions are filled with '0'.
  --         The COUNT leftmost elements are lost.

  -- Id: S.2
  function SHIFT_RIGHT (ARG : BIT_VECTOR; COUNT : NATURAL) return BIT_VECTOR;
  -- Result subtype: UNSIGNED(ARG'LENGTH-1 downto 0)
  -- Result: Performs a shift-right on an UNSIGNED vector COUNT times.
  --         The vacated positions are filled with '0'.
  --         The COUNT rightmost elements are lost.
  --============================================================================

  -- Id: S.5
  function ROTATE_LEFT (ARG : BIT_VECTOR; COUNT : NATURAL) return BIT_VECTOR;
  -- Result subtype: bit_vector(ARG'LENGTH-1 downto 0)
  -- Result: Performs a rotate-left of an UNSIGNED vector COUNT times.

  -- Id: S.6
  function ROTATE_RIGHT (ARG : BIT_VECTOR; COUNT : NATURAL) return BIT_VECTOR;
  -- Result subtype: bit_vector(ARG'LENGTH-1 downto 0)
  -- Result: Performs a rotate-right of an UNSIGNED vector COUNT times.


  --============================================================================

  ------------------------------------------------------------------------------
  -- Note: Function S.9 is not compatible with IEEE Std 1076-1987. Comment
  -- out the function (declaration and body) for IEEE Std 1076-1987 compatibility.
  ------------------------------------------------------------------------------
  -- Id: S.9
  function "sll" (ARG : BIT_VECTOR; COUNT : INTEGER) return BIT_VECTOR;
  -- Result subtype: BIT_VECTOR(ARG'LENGTH-1 downto 0)
  -- Result: SHIFT_LEFT(ARG, COUNT)

  ------------------------------------------------------------------------------
  -- Note: Function S.11 is not compatible with IEEE Std 1076-1987. Comment
  -- out the function (declaration and body) for IEEE Std 1076-1987 compatibility.
  ------------------------------------------------------------------------------
  -- Id: S.11
  function "srl" (ARG : BIT_VECTOR; COUNT : INTEGER) return BIT_VECTOR;
  -- Result subtype: BIT_VECTOR(ARG'LENGTH-1 downto 0)
  -- Result: SHIFT_RIGHT(ARG, COUNT)

  ------------------------------------------------------------------------------
  -- Note: Function S.13 is not compatible with IEEE Std 1076-1987. Comment
  -- out the function (declaration and body) for IEEE Std 1076-1987 compatibility.
  ------------------------------------------------------------------------------
  -- Id: S.13
  function "rol" (ARG : BIT_VECTOR; COUNT : INTEGER) return BIT_VECTOR;
  -- Result subtype: BIT_VECTOR(ARG'LENGTH-1 downto 0)
  -- Result: ROTATE_LEFT(ARG, COUNT)

  ------------------------------------------------------------------------------
  -- Note: Function S.15 is not compatible with IEEE Std 1076-1987. Comment
  -- out the function (declaration and body) for IEEE Std 1076-1987 compatibility.
  ------------------------------------------------------------------------------
  -- Id: S.15
  function "ror" (ARG : BIT_VECTOR; COUNT : INTEGER) return BIT_VECTOR;
  -- Result subtype: BIT_VECTOR(ARG'LENGTH-1 downto 0)
  -- Result: ROTATE_RIGHT(ARG, COUNT)

  ------------------------------------------------------------------------------
  -- Note: Function S.17 is not compatible with IEEE Std 1076-1987. Comment
  -- out the function (declaration and body) for IEEE Std 1076-1987 compatibility.
  ------------------------------------------------------------------------------
  -- Id: S.17
  function "sla" (ARG : BIT_VECTOR; COUNT : INTEGER) return BIT_VECTOR;
  -- Result subtype: BIT_VECTOR(ARG'LENGTH-1 downto 0)
  -- Result: SHIFT_LEFT(ARG, COUNT)

  ------------------------------------------------------------------------------
  -- Note: Function S.19 is not compatible with IEEE Std 1076-1987. Comment
  -- out the function (declaration and body) for IEEE Std 1076-1987 compatibility.
  ------------------------------------------------------------------------------
  -- Id: S.19
  function "sra" (ARG : BIT_VECTOR; COUNT : INTEGER) return BIT_VECTOR;
  -- Result subtype: BIT_VECTOR(ARG'LENGTH-1 downto 0)
  -- Result: SHIFT_RIGHT(ARG, COUNT)


  --============================================================================
  --   RESIZE Functions
  --============================================================================

  -- Id: R.2
  function RESIZE (ARG : BIT_VECTOR; NEW_SIZE : NATURAL) return BIT_VECTOR;
  -- Result subtype: bit_vector(NEW_SIZE-1 downto 0)
  -- Result: Resizes the UNSIGNED vector ARG to the specified size.
  --         To create a larger vector, the new [leftmost] bit positions
  --         are filled with '0'. When truncating, the leftmost bits
  --         are dropped.

  --============================================================================
  -- Conversion Functions
  --============================================================================

  -- Id: D.1
  function TO_INTEGER (ARG : BIT_VECTOR) return NATURAL;
  -- Result subtype: NATURAL. Value cannot be negative since parameter is an
  --             UNSIGNED vector.
  -- Result: Converts the UNSIGNED vector to an INTEGER.

  -- Id: D.3
  function To_BitVector (ARG, SIZE : NATURAL) return BIT_VECTOR;
  -- Result subtype: bit_vector(SIZE-1 downto 0)
  -- Result: Converts a non-negative INTEGER to an UNSIGNED vector with
  --         the specified size.

-- begin LCS-2006-130
  alias To_Bit_Vector is
    To_BitVector[NATURAL, NATURAL return BIT_VECTOR];
  alias To_BV is
    To_BitVector[NATURAL, NATURAL return BIT_VECTOR];

-- end LCS-2006-130
end package NUMERIC_BIT_UNSIGNED;