> current llvm didn't do any pre optimization.  They always
> backup+restore for each rounding mode intrinsic

I see.  There is still the option of lazily restoring the
(entry) FRM before a function call but not read the FRM
after every call.  Do we have any data on how good or bad the
mode-switching LCM works when we explicitly backup and restore
for each intrinsic?

Regards
 Robin

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