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(nasm.info)Section B.4.49

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B.4.49. `CVTSS2SD': Scalar Single-Precision FP to Scalar Double-Precision FP Conversion
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     CVTSS2SD xmm1,xmm2/mem32      ; F3 0F 5A /r     [WILLAMETTE,SSE2]

   `CVTSS2SD' converts a single-precision FP value from the source
operand to a double-precision FP value in the low quadword of the
destination operand. The upper quadword is left unchanged.

   The destination operand is an `XMM' register. The source can be
either an `XMM' register or a 32-bit memory location. If the source is a
register, the input value is contained in the low doubleword.

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