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(nasm.info)Section B.4.232

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B.4.232. `PMAGW': MMX Packed Magnitude
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     PMAGW mm1,mm2/m64             ; 0F 52 /r             [CYRIX,MMX]

   `PMAGW', specific to the Cyrix MMX extensions, treats both its
operands as vectors of four signed words. It compares the absolute
values of the words in corresponding positions, and sets each word of
the destination (first) operand to whichever of the two words in that
position had the larger absolute value.