DCFS directive allocates memory for word-aligned
single-precision floating-point numbers, and defines the initial
runtime contents of the memory. Single-precision numbers occupy
one word and must be word aligned to be used in arithmetic operations.
DCFSU is the same, except that the memory alignment
is a single-precision floating-point literal.
DCFS inserts up to three bytes of padding before
the first defined number, if necessary to achieve four-byte alignment.
DCFSU if you do not require alignment.
The range for single-precision values is: