MOVSX           Move With Sign-Extend                Flags: Not altered

MOVSX destination,source                             CPU: 386+

        Logic   destination ← sign-extend(source)

    MOVSX extends the sign of an 8-bit value to a 16-bit value, or an
    8-bit or 16-bit value to a 32-bit value.


    Opcode      Format
    0F BE /r    MOVSX r16,r/m8
    0F BE /r    MOVSX r32,r/m8
    0F BF /r    MOVSX r32,r/m16


    Length and timing
    Operands    Bytes   8088    186     286     386     486     Pentium
    reg, reg      3                              3       3       3   NP
    reg, mem    3+d(0,1,2,4)                     6       3       3   NP