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[Bug target/54272] [SH] Add support for addv / subv instructions


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54272

--- Comment #8 from Oleg Endo <olegendo at gcc dot gnu.org> ---
Recently some __builtin_*_overflow functions have been added, of which some
could utilize the addv and subv instructions.  See also
https://gcc.gnu.org/onlinedocs/gcc/Integer-Overflow-Builtins.html


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