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    From
    SubjectRe: Linux support for Intel MMX CPU's
    Date
    Followup to:  <4vc0sf$ds5@news.ox.ac.uk>
    By author: mbeattie@sable.ox.ac.uk (Malcolm Beattie)
    In newsgroup: linux.dev.kernel
    >
    > Linus mentioned that task switching used tricks to be lazy about
    > FPU state saving. I can't find the relevant code right now. Maybe
    > somebody should check that these MMX instructions don't bypass
    > whatever method Linux uses to trigger a forced save of FPU state.
    >

    If the kernel uses fsave/frestore it is OK; these instructions have
    been explicitly amended to support either flavour of FPU state.

    -hpa

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