* This means that in this format there are 61 bits available
* for the nan payload.
*
+ * Note that the 32-bit x86 ABI cannot do signaling nans: the x87
+ * simply cannot preserve the bit. You can either use the 80-bit
+ * extended precision (long double, -Duselongdouble), or use x86-64.
+ *
* In all platforms, the payload bytes (and bits, some of them are
* often in a partial byte) themselves can be either all zero (x86),
* all one (sparc or mips), or a mixture: in IEEE 754 128-bit double