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(nasm.info)Section B.4.237

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B.4.237. `PMOVMSKB': Move Byte Mask To Integer
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     PMOVMSKB reg32,mm             ; 0F D7 /r        [KATMAI,MMX]
     PMOVMSKB reg32,xmm            ; 66 0F D7 /r     [WILLAMETTE,SSE2]

   `PMOVMSKB' returns an 8-bit or 16-bit mask formed of the most
significant bits of each byte of source operand (8-bits for an `MMX'
register, 16-bits for an `XMM' register).