11.4.3. Default NaN mode

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

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