ecnelises wrote:

> Maybe we can do some perf test between this expansion for set rounding mode 
> and the system library's version for fesetround().

They are faster than system `fesetround` on both Linux and AIX. Linux glibc 
optimizes `fesetround` with faster `mffscrn` on P9, I just exploited the 
instruction here.

https://github.com/llvm/llvm-project/pull/67302
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