On Sat, May 26, 2018 at 11:09:24AM +0100, Richard Sandiford wrote: > On the wider point about changing the way call clobber information > is represented: I agree it would be good to generalise what we have > now. But if possible I think we should avoid target hooks that take > a specific call, and instead make it an inherent part of the call insn > itself, much like CALL_INSN_FUNCTION_USAGE is now. E.g. we could add > a field that points to an ABI description, with -fipa-ra effectively > creating ad-hoc ABIs. That ABI description could start out with > whatever we think is relevant now and could grow over time.
Somewhat related: there still is PR68150 open for problems with HARD_REGNO_CALL_PART_CLOBBERED in postreload-gcse (it ignores it). Segher
