[Bug middle-end/61876] Converting __builtin_round + cast into __builtin_lround is not always equivalent in regards to math errno

[ktkachov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61876

ktkachov at gcc dot gnu.org changed:

           What    |Removed                     |Added
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           Keywords|                            |missed-optimization
          Component|tree-optimization           |middle-end

--- Comment #1 from ktkachov at gcc dot gnu.org ---
This particular example is given for aarch64 but I imagine it could occur for
any other target.

>From what I understand lround can potentially set errno on a domain error
whereas round is valid everywhere and the cast to long int could be undefined
behaviour if the double is not valid, but undefined behaviour is not the same
as setting errno...