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entity atod is
end atod;
architecture behav of atod is
type real_array is array (natural range <>) of real;
constant csts : real_array :=
(1.0,
0.0,
-- Corner cases from
-- http://www.exploringbinary.com/
-- decimal-to-realing-point-needs-arbitrary-precision/
7.8459735791271921e65,
-- In binary:
-- 1.11011100 11010000 00001000 10011100 00010011 00010100 1110 e218
-- 1. d c d 0 0 8 9 c 1 3 1 4 e
3.571e266,
-- 1.01100010 01100100 01001100 01100001 11010100 00011010 1010 e885
-- 1. 6 2 6 4 4 c 6 1 d 4 1 a a
3.08984926168550152811E-32,
-- 1.01000000 11011110 01001000 01100111 01100110 01010011 1011 e-105
-- 1. 4 0 d e 4 8 6 7 6 6 5 3 b
7.4505805969238281e-09
-- 1.00000000 e-27
);
begin
process
variable v : real;
begin
for i in csts'range loop
report to_string (csts (i), "%a") severity note;
end loop;
v := csts (2);
assert to_string (v, "%.13a") = "0x1.dcd0089c1314ep+218" severity failure;
v := csts (3);
assert to_string (v, "%.13a") = "0x1.62644c61d41aap+885" severity failure;
wait;
end process;
end behav;
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