Floating Point
--------------

   The floating point code is not too well tested, and may have subtle
bugs in it.

   Packed decimal (P) format floating literals are not supported.  Feel
free to add the code!

   The floating point formats generated by directives are these.

`.float'
     `Single' precision floating point constants.

`.double'
     `Double' precision floating point constants.

   There is no directive to produce regions of memory holding extended
precision numbers, however they can be used as immediate operands to
floating-point instructions.  Adding a directive to create extended
precision numbers would not be hard, but it has not yet seemed
necessary.