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(nasm.info)Section B.4.45

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B.4.45. `CVTSD2SI': Scalar Double-Precision FP to Signed INT32 Conversion
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     CVTSD2SI reg32,xmm/mem64      ; F2 0F 2D /r     [WILLAMETTE,SSE2]

   `CVTSD2SI' converts a double-precision FP value from the source
operand to a signed doubleword in the destination operand.

   The destination operand is a general purpose 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.