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(nasm.info)Section B.4.54

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B.4.54. `CVTTPS2PI': Packed Single-Precision FP to Packed Signed INT32 Conversion with Truncation
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     CVTTPS2PI mm,xmm/mem64         ; 0F 2C /r       [KATMAI,SSE]

   `CVTTPS2PI' converts two packed single-precision FP values in the
source operand to two packed signed doublewords in the destination
operand.  If the result is inexact, it is truncated (rounded toward
zero). If the source is a register, the input values are in the low
quadword.

   The destination operand is an `MMX' 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.