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package mylib_pkg is
pure function ceil_log2(constant v : natural) return natural;
end package mylib_pkg;
package body mylib_pkg is
pure function ceil_log2(constant v : natural) return natural is
variable res : natural;
begin
res := 31;
for i in 30 downto 0 loop
if (2**i >= v) then
res := i;
end if;
end loop;
return res;
end function ceil_log2;
end package body mylib_pkg;
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