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(nasm.info)Section B.4.145

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B.4.145. `MASKMOVDQU': Byte Mask Write
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     MASKMOVDQU xmm1,xmm2          ; 66 0F F7 /r     [WILLAMETTE,SSE2]

   `MASKMOVDQU' stores data from xmm1 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
xmm2 is used to selectively write the data (0 = no write, 1 = write) on
a per- byte basis.