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(nasm.info)Section B.4.146

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B.4.146. `MASKMOVQ': Byte Mask Write
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     MASKMOVQ mm1,mm2              ; 0F F7 /r        [KATMAI,MMX]

   `MASKMOVQ' stores data from mm1 to the location specified by
`ES:(E)DI'. The size of the store depends on the address-size
attribute. The most significant bit in each byte of the mask register
mm2 is used to selectively write the data (0 = no write, 1 = write) on
a per- byte basis.