DCQ directive allocates one or more eight-byte
blocks of memory, aligned on four-byte boundaries, and defines the
initial runtime contents of the memory.
DCQU is the same, except that the memory alignment
is a 64-bit numeric literal.
The range of numbers permitted is 0 to 264-1.
In addition to the characters normally permitted in a numeric literal, you can prefix
with a minus sign. In this case, the range of numbers permitted is -263 to -1.
The result of specifying
-is the same as the result of specifying 264-
is a numeric expression that evaluates to a 64-bit integer.
DCQ inserts up to three bytes of padding before
the first defined eight-byte block, if necessary, to achieve four-byte
DCQU if you do not require alignment.