(nasm.info)Section B.4.243


B.4.243. `PMVccZB': MMX Packed Conditional Move
-----------------------------------------------

     PMVZB mmxreg,mem64            ; 0F 58 /r             [CYRIX,MMX]
     PMVNZB mmxreg,mem64           ; 0F 5A /r             [CYRIX,MMX]
     PMVLZB mmxreg,mem64           ; 0F 5B /r             [CYRIX,MMX]
     PMVGEZB mmxreg,mem64          ; 0F 5C /r             [CYRIX,MMX]

   These instructions, specific to the Cyrix MMX extensions, perform
parallel conditional moves. The two input operands are treated as
vectors of eight bytes. Each byte of the destination (first) operand is
either written from the corresponding byte of the source (second)
operand, or left alone, depending on the value of the byte in the
_implied_ operand (specified in the same way as `PADDSIW', in *Note
Section B.4.200::).

   * `PMVZB' performs each move if the corresponding byte in the implied
     operand is zero;

   * `PMVNZB' moves if the byte is non-zero;

   * `PMVLZB' moves if the byte is less than zero;

   * `PMVGEZB' moves if the byte is greater than or equal to zero.

   Note that these instructions cannot take a register as their second
source operand.


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