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d5014
2020 Feb 22
2
COPYs between register classes
...r deduce the needed register
class for a CopyFromReg if there is only one user which is a
COPY_TO_REGCLASS. I thought this seemed a bit messy, so I instead tried
adding a new TargetRegisterInfo hook that is used in InstrEmitter when
emitting CopyToReg/CopyFromReg nodes (https://reviews.llvm.org/D75014).
Does this make sense, or is there a better way?
A related question is if the target is required to be able to implement
*any* move between register classes?
Thanks,
Jonas