A.5.40 CVTPI2PD: Packed Signed INT32 to Packed Double-Precision FP
Conversion
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.