A.5.280 RSQRTSS: Scalar Single-Precision FP Square Root Reciprocal
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