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------------------------------------------------------------------------------
-- Copyright (c) 2018 by Paul Scherrer Institute, Switzerland
-- All rights reserved.
-- Authors: Oliver Bruendler
------------------------------------------------------------------------------
------------------------------------------------------------------------------
-- Libraries
------------------------------------------------------------------------------
library ieee ;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
library work;
use work.psi_common_array_pkg.all;
------------------------------------------------------------------------------
-- Package Header
------------------------------------------------------------------------------
package psi_common_math_pkg is
function log2(arg : in natural) return natural;
function log2ceil(arg : in natural) return natural;
function log2ceil(arg : in real) return natural;
function isLog2(arg : in natural) return boolean;
function max( a : in integer;
b : in integer) return integer;
function min( a : in integer;
b : in integer) return integer;
-- choose t if s=true else f
function choose( s : in boolean;
t : in std_logic;
f : in std_logic) return std_logic;
function choose( s : in boolean;
t : in std_logic_vector;
f : in std_logic_vector) return std_logic_vector;
function choose( s : in boolean;
t : in integer;
f : in integer) return integer;
function choose( s : in boolean;
t : in string;
f : in string) return string;
function choose( s : in boolean;
t : in real;
f : in real) return real;
function choose( s : in boolean;
t : in unsigned;
f : in unsigned) return unsigned;
-- count occurence of a value inside an array
function count( a : in t_ainteger;
v : in integer) return integer;
function count( a : in t_abool;
v : in boolean) return integer;
function count( a : in std_logic_vector;
v : in std_logic) return integer;
end psi_common_math_pkg;
------------------------------------------------------------------------------
-- Package Body
------------------------------------------------------------------------------
package body psi_common_math_pkg is
-- *** Log2 integer ***
function log2(arg : in natural) return natural is
variable v : natural := arg;
variable r : natural := 0;
begin
while v > 1 loop
v := v/2;
r := r+1;
end loop;
return r;
end function;
-- *** Log2Ceil integer ***
function log2ceil(arg : in natural) return natural is
begin
if arg = 0 then
return 0;
end if;
return log2(arg*2-1);
end function;
-- *** Log2Ceil real ***
function log2ceil(arg : in real) return natural is
variable v : real := arg;
variable r : natural := 0;
begin
while v > 1.0 loop
v := v/2.0;
r := r+1;
end loop;
return r;
end function;
-- *** isLog2 ***
function isLog2(arg : in natural) return boolean is
begin
if log2(arg) = log2ceil(arg) then
return true;
else
return false;
end if;
end function;
-- *** Max ***
function max( a : in integer;
b : in integer) return integer is
begin
if a > b then
return a;
else
return b;
end if;
end function;
-- *** Min ***
function min( a : in integer;
b : in integer) return integer is
begin
if a > b then
return b;
else
return a;
end if;
end function;
-- *** Choose (std_logic) ***
function choose( s : in boolean;
t : in std_logic;
f : in std_logic) return std_logic is
begin
if s then
return t;
else
return f;
end if;
end function;
-- *** Choose (std_logic_vector) ***
function choose( s : in boolean;
t : in std_logic_vector;
f : in std_logic_vector) return std_logic_vector is
begin
if s then
return t;
else
return f;
end if;
end function;
-- *** Choose (integer) ***
function choose( s : in boolean;
t : in integer;
f : in integer) return integer is
begin
if s then
return t;
else
return f;
end if;
end function;
-- *** Choose (string) ***
function choose( s : in boolean;
t : in string;
f : in string) return string is
begin
if s then
return t;
else
return f;
end if;
end function;
-- *** Choose (real) ***
function choose( s : in boolean;
t : in real;
f : in real) return real is
begin
if s then
return t;
else
return f;
end if;
end function;
-- *** Choose (unsigned) ***
function choose( s : in boolean;
t : in unsigned;
f : in unsigned) return unsigned is
begin
if s then
return t;
else
return f;
end if;
end function;
-- *** count (integer) ***
function count( a : in t_ainteger;
v : in integer) return integer is
variable cnt_v : integer := 0;
begin
for idx in a'low to a'high loop
if a(idx) = v then
cnt_v := cnt_v+1;
end if;
end loop;
return cnt_v;
end function;
-- *** count (bool) ***
function count( a : in t_abool;
v : in boolean) return integer is
variable cnt_v : integer := 0;
begin
for idx in a'low to a'high loop
if a(idx) = v then
cnt_v := cnt_v+1;
end if;
end loop;
return cnt_v;
end function;
-- *** count (std_logic) ***
function count( a : in std_logic_vector;
v : in std_logic) return integer is
variable cnt_v : integer := 0;
begin
for idx in a'low to a'high loop
if a(idx) = v then
cnt_v := cnt_v+1;
end if;
end loop;
return cnt_v;
end function;
end psi_common_math_pkg;
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