Enable math operations on different width inputs

[mkorbel1]

Motivation

It would be nice to provide a mechanism to do math on signals/values of different widths when it is unambiguous. It's also potentially useful to have a larger output than either input.

Desired solution

There might be some scenarios where behavior can be safely inferred with just the operator and no additional inputs. In other cases, perhaps a special operator or function is required to enable users to explicitly handle width ambiguity.

Alternatives considered

Many operations always require exact width matching (as it is currently), meaning people should pad their values before performing the operation.

Additional details

SystemVerilog has features like this, though some may be a little dangerous.

[mkorbel1]

Probably related: intel/rohd-hcl#140