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(nasm.info)Section B.4.279

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B.4.279. `RSQRTPS': Packed Single-Precision FP Square Root Reciprocal
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     RSQRTPS xmm1,xmm2/m128        ; 0F 52 /r        [KATMAI,SSE]

   `RSQRTPS' computes the approximate reciprocals of the square roots of
the packed single-precision floating-point values in the source and
stores the results in xmm1. The maximum error for this approximation
is: |Error| <= 1.5 x 2^-12