[Bug 250454] PT_GETFPREGS on i386 oversimplifies translating FPU Tag Word

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250454

--- Comment #3 from Michał Górny <mgorny at gentoo.org> ---
> Can you explain why more precise translation from abridged to compat tags is
> important ?  Reasoning for not doing it was that Intel was fine with such
> limited reporting in HW, so why we should care ?

I'm not saying it's important.  I'm going to correctness.  One place where this
bit me are tests.  It's better to have them rely on the correct value.

> Please put the patch into phab, https://reviews.freebsd.org/differential.

I've managed to boot i386.  I'll do that once I test the patch there.

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