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(nasm.info)Section B.4.52

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B.4.52. `CVTTPD2PI': Packed Double-Precision FP to Packed Signed INT32 Conversion with Truncation
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     CVTTPD2PI mm,xmm/mem128        ; 66 0F 2C /r     [WILLAMETTE,SSE2]

   `CVTTPD2PI' converts two packed double-precision FP values in the
source operand to two packed single-precision FP values in the
destination operand. If the result is inexact, it is truncated (rounded
toward zero).

   The destination operand is an `MMX' register. The source can be
either an `XMM' register or a 128-bit memory location.

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