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(nasm.info)Section B.4.159

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B.4.159. `MOVD': Move Doubleword to/from MMX Register
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     MOVD mm,r/m32                 ; 0F 6E /r             [PENT,MMX]
     MOVD r/m32,mm                 ; 0F 7E /r             [PENT,MMX]
     MOVD xmm,r/m32                ; 66 0F 6E /r     [WILLAMETTE,SSE2]
     MOVD r/m32,xmm                ; 66 0F 7E /r     [WILLAMETTE,SSE2]

   `MOVD' copies 32 bits from its source (second) operand into its
destination (first) operand. When the destination is a 64-bit `MMX'
register or a 128-bit `XMM' register, the input value is zero-extended
to fill the destination register.