[Bug 79575] [radeonsi] Wine's d3d8 test crashes in SITargetLowering::analyzeImmediate

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79575

--- Comment #7 from Roland Scheidegger <sroland at vmware.com> ---
Specifically it looks like the wine test actually tries a control word which
enables all fpu exceptions.
Seems like nvidia drivers had the same problem at some point:
http://bugs.winehq.org/show_bug.cgi?id=28634
Looks like this is happening purely for testing if a fpu control word would be
preserved, the actual value used by d3d does disable them just fine (though, of
course, this could also happen on any app, not just wine, if it unmasks
exceptions before calling into mesa code).
I vaguely remember similar issues in the past in other parts of mesa code.
Though IIRC you aren't actually expected to leave the fpu control word in a
non-standard state when you're calling into library code, so I'm not really
sure if this qualifies as a mesa bug. In any way since this happens in llvm
code finally here it might even be a bug there. I guess the only way to fix
this kind of bug in mesa would be to change the fpu control word on all entry
points which could trigger numerical exceptions (and when additionally also
consistent results are on the wish list, would need to change it on all
entrypoints which could do some fpu calculations)) which I think is not
reasonable.

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