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(nasm.info)Section B.4.111

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B.4.111. `FXRSTOR': Restore `FP', `MMX' and `SSE' State
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     FXRSTOR memory                ; 0F AE /1               [P6,SSE,FPU]

   The `FXRSTOR' instruction reloads the `FPU', `MMX' and `SSE' state
(environment and registers), from the 512 byte memory area defined by
the source operand. This data should have been written by a previous
`FXSAVE'.