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(nasm.info)Section B.4.299

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B.4.299. `SQRTSD': Scalar Double-Precision FP Square Root
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     SQRTSD xmm1,xmm2/m128         ; F2 0F 51 /r     [WILLAMETTE,SSE2]

   `SQRTSD' calculates the square root of the low-order double-precision
FP value from the source operand, and stores the double-precision
result in the destination register. The high-quadword remains unchanged.