Hi, Richard.

Thanks for supporting register filter in IRA/LRA.
I found it is useful for RVV since we have a set of widen operations that allow source register overlap highpart of dest register group

For example, if vsext.vf2 v0(dest consume reg v0 and reg v1), v1 (source consume v1 only)
I want to support the highpart overlap above. (Currently, we don't any overlap between source and dest in such instructions).

So, I wonder whether we can pass "machine_mode" into register filter. Ok, I think it's too late since stage 1 closes. I wonder we can add it in GCC-15?

Thanks. 



juzhe.zhong@rivai.ai