DCFD directive allocates memory for word-aligned
double-precision floating-point numbers, and defines the initial
runtime contents of the memory. Double-precision numbers occupy
two words and must be word aligned to be used in arithmetic operations.
DCFDU is the same, except that the memory alignment
is a double-precision floating-point literal.
The assembler inserts up to three bytes of padding before the first defined number, if necessary, to achieve four-byte alignment.
DCFDU if you do not require alignment.
The word order used when converting
internal form is controlled by the floating-point architecture selected.
You cannot use
DCFDU if you select
--fpu none option.
The range for double-precision numbers is: