DCFD and DCFDU
DCFD directive allocates memory for word-aligned double-precision floating-point numbers, and defines the initial runtime contents of the memory.
DCFDU is the same, except that the memory alignment is arbitrary.
is a double-precision floating-point literal.
Double-precision numbers occupy two words and must be word aligned to be used in arithmetic operations. 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
fpliteral to internal form is controlled
by the floating-point architecture selected. You cannot use
DCFDU if you select the
--fpu none option.
The range for double-precision numbers is:
DCFD 1E308,-4E-100 DCFDU 10000,-.1,3.1E26