VFP_DOUBLE_SIGNIFICAND_QNAN
else if (s->significand & VFP_DOUBLE_SIGNIFICAND_QNAN)
nan->significand |= VFP_DOUBLE_SIGNIFICAND_QNAN;
.significand = VFP_DOUBLE_SIGNIFICAND_QNAN,
vdd.significand |= VFP_DOUBLE_SIGNIFICAND_QNAN;