Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

logarithm to the basis 2

Hi, is there a way to calculate the logarithm to the basis 2 of a generic parameter? I don't need a synthesizeable circuit. I just want the compiler to to calculate an integer and asign it to a...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

In VHDL: 

function log2 (x : positive) 
	return natural 
	is 
	begin
		if x = 1 then
			return 0 ;
		else
			return log2(x / 2) + 1;
		end if;
	end function log2 ;