VFP_SINGLE_SIGNIFICAND_QNAN
else if (s->significand & VFP_SINGLE_SIGNIFICAND_QNAN)
vsd.significand |= VFP_SINGLE_SIGNIFICAND_QNAN;
nan->significand |= VFP_SINGLE_SIGNIFICAND_QNAN;
.significand = VFP_SINGLE_SIGNIFICAND_QNAN,