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(nasm.info)Section B.4.43

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B.4.43. `CVTPS2PD': Packed Single-Precision FP to Packed Double-Precision FP Conversion
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     CVTPS2PD xmm1,xmm2/mem64      ; 0F 5A /r        [WILLAMETTE,SSE2]

   `CVTPS2PD' converts two packed single-precision FP values 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 input values are in the low quadword.

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