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(nasm.info)Section B.4.181

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B.4.181. `MOVSX', `MOVZX': Move Data with Sign or Zero Extend
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     MOVSX reg16,r/m8              ; o16 0F BE /r         [386]
     MOVSX reg32,r/m8              ; o32 0F BE /r         [386]
     MOVSX reg32,r/m16             ; o32 0F BF /r         [386]

     MOVZX reg16,r/m8              ; o16 0F B6 /r         [386]
     MOVZX reg32,r/m8              ; o32 0F B6 /r         [386]
     MOVZX reg32,r/m16             ; o32 0F B7 /r         [386]

   `MOVSX' sign-extends its source (second) operand to the length of its
destination (first) operand, and copies the result into the destination
operand. `MOVZX' does the same, but zero-extends rather than sign-
extending.