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subregcoveredbits
2016 Aug 17
3
RFC: Disambiguate RegClass->getSize()
...ay be interested in different aspects of the
returned value: register allocator may care about the spill size while
optimizations tracking the predicate values will be interested in the
actual size of the register.
Moreover, if a register for which these two values differ had
subregisters, the SubRegCoveredBits information could not be assumed to
match the return value of getSize.
*** Proposal
Replace the getSize function in MCRegisterClass and TargetRegisterClass
with two functions: getRegSize and getSpillSize.
TableGen would need to be modified to generate both of them, and unless
the user spec...