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(nasm.info)Section B.4.309

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B.4.309. `SUBSS': Scalar Single-FP Subtract
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     SUBSS xmm1,xmm2/m128          ; F3 0F 5C /r     [KATMAI,SSE]

   `SUBSS' subtracts the low-order single-precision FP value of the
source operand from that of the destination operand, and stores the
result in the destination operation. The three high doublewords are
unchanged.