https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84071
--- Comment #22 from Eric Botcazou <ebotcazou at gcc dot gnu.org> --- > So MIPS fundamentally needs this feature to work correctly; whether AArch64 > needs it or may just benefit from it depends on a lot of detailed knowledge > of the ISA and architecture. Given Richard Sandiford is currently working on > ARM ports but also fully understands the MIPS arch then he may be a good > person to consult. If "this feature" is WORD_REGISTER_OPERATIONS, then I don't think that any target, including MIPS, really needs it. Defining the macro is only an optimization and a way to convey multiple properties of the target with only one setting. And, for MIPS, the implementation of the sign-extension invariant is done by other means.
