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library ieee;
use ieee.std_logic_1164.all;
entity impure_ex is
port (
clk : in std_logic;
arg : in std_logic;
res : out std_logic
);
end impure_ex;
architecture rtl of impure_ex is
-- An impure function called from a combinatorial process with "all"
-- sensitivity triggers an exception.
impure function foo return std_logic is
begin
return arg;
end function foo;
signal ns : std_logic;
begin
--comb_process : process(res) -- this works
comb_process : process(all)
begin
ns <= res XOR foo;
end process;
process(clk)
begin
if rising_edge(clk) then
res <= ns;
end if;
end process;
end rtl;
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