Re: [myhdl-list] essay about integer arithmetic

[Jan D. <ja...@ja...>]

Pieter wrote:
>> If you want to multiply 8bit x 8bit and result in 16bit, what you do in
>> convert both operands to 16bit first.
> 
> Hmm, for me it seems more logical that you should have 16 bits at the
> left hand side of the assignment, to get a 16 bit result?
> 
> result_16 = op_a_8 * op_b_8;

There we go :-)

See? If you start from the bit-widths, nobody agrees and
the result seems always wrong.

I think bit widths should be such that an integer
interpretation works as expected. However, calling this
"automating bit-widths" is really too much honour. It's
close to trivial. The trick is in the mindset.

Jan

-- 
Jan Decaluwe - Resources bvba - http://www.jandecaluwe.com
    Python as a hardware description language:
    http://www.myhdl.org