vfp_double_packed_mantissa
if (vfp_double_packed_exponent(m) == 2047 && vfp_double_packed_mantissa(m)) {
if (signal_on_qnan || !(vfp_double_packed_mantissa(m) & (1ULL << (VFP_DOUBLE_MANTISSA_BITS - 1))))
if (vfp_double_packed_exponent(d) == 2047 && vfp_double_packed_mantissa(d)) {
if (signal_on_qnan || !(vfp_double_packed_mantissa(d) & (1ULL << (VFP_DOUBLE_MANTISSA_BITS - 1))))