https://bugs.winehq.org/show_bug.cgi?id=50429
--- Comment #10 from Zebediah Figura z.figura12@gmail.com --- Here are the tests I did:
32-bit msvcrt: Results match x87 version using fpatan exactly. Results are affected by setting x87 control word precision flags beforehand.
64-bit msvcrt: A different set of results. Also affected by setting x87 precision flags.
32-bit ucrtbase: A different set of results. Not affected by x87 precision flags.
64-bit ucrtbase: A different set of results. Not affected by x87 precision flags.
32-bit wine results do seem to perfectly match 32-bit ucrtbase results.
I didn't test with any other value than in the logs attached, though.