http://bugs.winehq.org/show_bug.cgi?id=59001
--- Comment #1 from Rafał Mużyło galtgendo@o2.pl --- Funny thing, cause for me having '-march=znver1' causes run failures in some corner cases (I've got a pretty old bug about that, that's effectively a WONTFIX, cause it's runtime data obfuscator problem).
If this is genuine and someone seriously investigates it, the results might be somewhat interesting...