[Mesa-dev] [Bug 66806] [softpipe] glxgears floating point exception

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=66806

--- Comment #3 from Roland Scheidegger <sroland at vmware.com> ---
(In reply to comment #2)
> Indeed 
> http://software.intel.com/en-us/articles/x87-and-sse-floating-point-assists-
> in-ia-32-flush-to-zero-ftz-and-denormals-are-zero-daz
> 
> suggests to mask certain exceptions together with the FTZ/DAZ bits:
> So we should probably do the same.

Yes but I think we really should mask ALL exceptions regardless of denorms. A
shader might easily do things causing exceptions (divide by zero or whatnot)
and there's certainly no signaled exceptions in 3d graphics. I think we've just
not seen issues because they are masked by default and no app unmasked them.
Might be worth adding a piglit test for that.

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