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(nasm.info)Section B.4.48

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B.4.48. `CVTSI2SS': Signed INT32 to Scalar Single-Precision FP Conversion
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     CVTSI2SS xmm,r/m32            ; F3 0F 2A /r     [KATMAI,SSE]

   `CVTSI2SS' converts a signed doubleword from the source operand to a
single-precision FP value in the low doubleword of the destination
operand.  The upper 3 doublewords are left unchanged.

   The destination operand is an `XMM' register. The source can be
either a general purpose register or a 32-bit memory location.

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