[Bug target/121213] Poor RV64 code generated for __atomic_exchange_n (llvm seems to do it right)

[law at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121213

--- Comment #6 from Jeffrey A. Law <law at gcc dot gnu.org> ---
And you'll note the bug is still open and that Austin explicitly indicated the
redundant sign extend is still in there.  That's a separate issue that needs a
completely different approach to solve.