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(nasm.info)Section B.4.269

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B.4.269. `RCPSS': Scalar Single-Precision FP Reciprocal
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     RCPSS xmm1,xmm2/m128          ; F3 0F 53 /r     [KATMAI,SSE]

   `RCPSS' returns an approximation of the reciprocal of the lower
single-precision FP value from xmm2/m32; the upper three fields are
passed through from xmm1. The maximum error for this approximation is:
|Error| <= 1.5 x 2^-12