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(nasm.info)Section B.4.300

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B.4.300. `SQRTSS': Scalar Single-Precision FP Square Root
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     SQRTSS xmm1,xmm2/m128         ; F3 0F 51 /r     [KATMAI,SSE]

   `SQRTSS' calculates the square root of the low-order single-precision
FP value from the source operand, and stores the single-precision
result in the destination register. The three high doublewords remain
unchanged.