GNU Info

(nasm.info)Section B.4.203

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B.4.203. `PAUSE': Spin Loop Hint
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     PAUSE                         ; F3 90           [WILLAMETTE,SSE2]

   `PAUSE' provides a hint to the processor that the following code is a
spin loop. This improves processor performance by bypassing possible
memory order violations. On older processors, this instruction operates
as a `NOP'.