18.4.3. Default NaN mode

Setting the DN bit, FPSCR[25] enables Default NaN mode. In Default NaN mode, the result of any operation that involves an input NaN or generated a NaN result returns the default NaN. Propagation of the fraction bits is maintained only by FABS, FNEG, and FCPY operations, all other CDP operations ignore any information in the fraction bits of an input NaN.

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