As, regrettably, it has been necessary for Ed Jaffe to point out,
| DC 0H
fills conditionally with x'00' and
| DS 0H
does not. There are, however, many situations:
o those in which ensuring "an unbroken flow of executable instructions" is
necessary, and
o those in which fullword. doubleword, or quadword alignment in required,
in which
| CNOP <byte>,<boundary>
which is much more powerful and flexible, should be used instead. In my
own coding I do not anymore encounter frequent---I had almost written
any---requirements for halfword alignment.
John Gilmore
Ashland, MA 01721
USA
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