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(nasm.info)Section B.4.280

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B.4.280. `RSQRTSS': Scalar Single-Precision FP Square Root Reciprocal
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     RSQRTSS xmm1,xmm2/m128        ; F3 0F 52 /r     [KATMAI,SSE]

   `RSQRTSS' returns an approximation of the reciprocal of the square
root of the lowest order single-precision FP value from the source, and
stores it in the low doubleword of the destination register. The upper
three fields of xmm1 are preserved. The maximum error for this
approximation is: |Error| <= 1.5 x 2^-12