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-- This -*- vhdl -*- file is part of GHDL.
-- IEEE 1076.2 math_real package body.
-- 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 body MATH_REAL is
function SIGN (X : REAL) return REAL is
begin
if X > 0.0 then
return 1.0;
elsif X < 0.0 then
return -1.0;
else
return 0.0;
end if;
end SIGN;
function CEIL (X : REAL) return REAL is
begin
assert false severity failure;
end CEIL;
function FLOOR (X : REAL) return REAL is
begin
assert false severity failure;
end FLOOR;
function ROUND (X : REAL) return REAL is
begin
assert false severity failure;
end ROUND;
function TRUNC (X : REAL) return REAL is
begin
assert false severity failure;
end TRUNC;
procedure UNIFORM (SEED1, SEED2 : inout POSITIVE; X : out REAL)
is
variable z, k : Integer;
begin
k := seed1 / 53668;
seed1 := 40014 * (seed1 - k * 53668) - k * 12211;
if seed1 < 0 then
seed1 := seed1 + 2147483563;
end if;
k := seed2 / 52774;
seed2 := 40692 * (seed2 - k * 52774) - k * 3791;
if seed2 < 0 then
seed2 := seed2 + 2147483399;
end if;
z := seed1 - seed2;
if z < 1 then
z := z + 2147483562;
end if;
x := real (z) * 4.656613e-10;
end UNIFORM;
function SIN (X : REAL) return REAL is
begin
assert false severity failure;
end SIN;
function COS (X : REAL) return REAL is
begin
assert false severity failure;
end COS;
end MATH_REAL;
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