7.14 .dcb[ size ] number [, fill ]

This directive emits number copies of fill , each of size bytes. Both number and fill are absolute expressions. If the comma and fill are omitted, fill is assumed to be zero. The size suffix, if present, must be one of:

.b
Emits single byte values.
.d
Emits double-precision floating point values.
.l
Emits 4-byte values.
.s
Emits single-precision floating point values.
.w
Emits 2-byte values.
.x
Emits long double-precision floating point values.

If the size suffix is omitted then ‘ .w ’ is assumed.

The byte ordering is target dependent, as is the size and format of floating point values.