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(nasm.info)Section B.4.46

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B.4.46. `CVTSD2SS': Scalar Double-Precision FP to Scalar Single-Precision FP Conversion
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     CVTSD2SS xmm1,xmm2/mem64      ; F2 0F 5A /r     [KATMAI,SSE]

   `CVTSD2SS' converts a double-precision FP value 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 an `XMM' register or a 64-bit memory location. If the source is a
register, the input value is in the low quadword.

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