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

[vincenzo.romano at gmail dot com via Gcc-bugs]

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

--- Comment #4 from Vincenzo Romano <vincenzo.romano at gmail dot com> ---
What about my point no.2?

> It adds a useless "sign extend" pseudo instruction for 32-bit word.