Takes in two 32-bit integers and uses the GCD-based algorithm to calculate their Least Common Multiple (LCM). This is not meant for synthesis!
Reference: Wikipedia: Least Common Multiple
Bring in the function at the start of the body of your module like so:
`include "lcm_function.vh"
Pass the function values which, at elaboration time, are either constant or expressions which evaluates to constants. Then use the output value as an integer for a localparam, genvar, etc...
The formula is decomposed this way so the division always returns an integer, and so we can't end up with intermediate values that don't fit in an integer.
Since this is an included file, it must be idempotent. (defined only once globally)
`ifndef LCM_FUNCTION
`define LCM_FUNCTION
`include "gcd_function.vh"
`include "abs_function.vh"
function integer lcm;
input integer A;
input integer B;
begin
lcm = abs(A) * (abs(B) / gcd(A,B));
end
endfunction
`endif