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(nasm.info)Section B.4.308

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B.4.308. `SUBSD': Scalar Single-FP Subtract
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     SUBSD xmm1,xmm2/m128          ; F2 0F 5C /r     [WILLAMETTE,SSE2]

   `SUBSD' subtracts the low-order double-precision FP value of the
source operand from that of the destination operand, and stores the
result in the destination operation. The high quadword is unchanged.