Yeah, poor wording on my part. You're not going to be able to avoid 90-degree corners in any case when 45-degree (or any other non-axis-aligned) lines are not a

Yeah, poor wording on my part. You're not going to be able to avoid 90-degree corners in any case when 45-degree (or any other non-axis-aligned) lines are not allowed in designs for many processes. What I should have said is that the metal line widths should take electromigration into account. There are also fun things like optical proximity correction [1], but of course these things are mainly handled automatically by simulations/EDA tools now. [1] https://en.wikipedia.org/wiki/Optical_proximity_correction https://en.wikipedia.org/wiki/Optical_proximity_correction