[D-runtime] Fibers and x87/SSE control words?

[Alex]

I say +1 for correctness. Much more important than the negligible speed loss.

Regards,
Alex

On Mon, Feb 13, 2012 at 7:51 PM, David Nadlinger <code at klickverbot.at> wrote:
> After a few hours of reverse-engineering x86 SEH, I finally got exceptions
> in fibers working on my Windows Server 2008 R2 box – sorry, Sean, that I
> reported them working after your previous changes, I was only testing on my
> XP VM. Please see:
> https://github.com/D-Programming-Language/druntime/pull/150 (not
> super-urgent, but fixes the Thrift async client code)
>
> Anyway, while working on the code, I noticed that we are currently not
> saving/restoring the x87 and SSE control words. Now, I'd certainly love to
> keep the context switching overhead as low as possible, but should we add a
> pair of stmxcsr/ldmxcsr reps. fnstcw/fldcw for the sake of correctness?
>
> If necessary, I can prepare a patch.
>
> David
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