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Date: Fri, 7 Feb 2020 16:38:57 -0500
From: Rich Felker <>
Subject: Re: Considering x86-64 fenv.s to C

On Sat, Feb 08, 2020 at 08:25:43AM +1100, Damian McGuckin wrote:
> In considering an i386 architecture with XMM capability, there is an issue
> with fegetenv()/feholdexcept() and fesetenv()/feupdateenv().
> There is no __mxcsr field in the fenv_t structure.
> So, there is no way to return the MXCSR using the first pair.
> Do I just bury any MXCSR exceptions into the __status_word?
> Regards - Damian

There's plenty of unused space to tuck it away somewhere if we wanted,
but I don't know if it's actually useful to do so. I'm fine with just
merging the states like the other fenv functions do.


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