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(nasm.info)Section B.4.170

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B.4.170. `MOVMSKPS': Extract Packed Single-Precision FP Sign Mask
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     MOVMSKPS reg32,xmm              ; 0F 50 /r      [KATMAI,SSE]

   `MOVMSKPS' inserts a 4-bit mask in r32, formed of the most
significant bits of each single-precision FP number of the source
operand.