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(nasm.info)Section B.4.35

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B.4.35. `CVTDQ2PD': Packed Signed INT32 to Packed Double-Precision FP Conversion
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     CVTDQ2PD xmm1,xmm2/mem64      ; F3 0F E6 /r     [WILLAMETTE,SSE2]

   `CVTDQ2PD' 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 `XMM' register or a 64-bit memory location. If the source is a
register, the packed integers are in the low quadword.