On Thu, 2007-01-18 at 09:41 +0100, Steven Bosscher wrote: > There appear to be more bit operations in RTL, so perhaps it is a > better idea to implement a known-bits propagation pass for RTL, with > the new dataflow engine. If that's the case then most of the opportunities are appearing due to lowering of the IL which would make a lot of sense for detecting useless sign/zero extensions.
I'm not immediately aware of too many cases where lowering the IL is going to expose new opportunities to track and optimize nonzero/zero bits stuff. Jeff
