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(nasm.info)Section B.4.40

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B.4.40. `CVTPI2PD': Packed Signed INT32 to Packed Double-Precision FP Conversion
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     CVTPI2PD xmm,mm/mem64         ; 66 0F 2A /r     [WILLAMETTE,SSE2]

   `CVTPI2PD' converts two packed signed doublewords from the source
operand to two packed double-precision FP values in the destination
operand.

   The destination operand is an `XMM' register. The source can be
either an `MMX' register or a 64-bit memory location.

   For more details of this instruction, see the Intel Processor
manuals.