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SubjectRe: [patch 06/11] syslets: core, documentation
On Wed, 14 Feb 2007, Benjamin LaHaise wrote:

> On Wed, Feb 14, 2007 at 01:06:59PM -0800, Davide Libenzi wrote:
> > Bear with me Ben, and let's follow this up :) If you are in the middle of
> > an MMX copy operation, inside the syscall, you are:
> >
> > - Userspace, on task A, calls sys_async_exec
> >
> > - Userspace in _not_ doing any MMX stuff before the call
> That's an incorrect assumption. Every task/thread in the system has FPU
> state associated with it, in part due to the fact that glibc has to change
> some of the rounding mode bits, making them different than the default from
> a freshly initialized state.

IMO I still belive this is not a huge problem. FPU state propagation/copy
can be done in a clever way, once we detect the in-async condition.

- Davide

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