SWCU192 November 2021 CC1312R7 , CC1352P7 , CC2652P7 , CC2652R7
Setting the DN bit, FPSCR[25], enables default NaN mode. In this mode, the result of any arithmetic data processing operation that involves an input NaN, or that generates 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.