FWIW, I frequently use MVCIN to place eyecatchers in data structures
to avoid false hits if and when it becomes necessary to search through
a dump for the structure. For example:
MVCIN XxwaEye,=C'AWXX'+3 Put C'XXWA' in eyecatcher field
I also used it recently, along with a CUSE, to work from right to left
through a USS path/filename designation in order to identify and create
any non-existing directories.
So, in my book, like so many other instructions, its usefulness is
limited only by one's imagination.
At 12:15 PM 10/10/2005, john gilmore wrote:
>As Bruce has pointed out, this instruction continues to be available.
>
>Moreover, it has a number of at least moderately obvious uses. For example,
>many binary-to-decimal conversion routines generate digits in right-to-left,
>least-to-most significant, sequence; and MVCIN can be used to reverse them.
>(It is much cheaper than the recursive scheme advocated in a celebrated C
>textbook for addressing this problem.)
>
>More importantly, the comment
>
>>C'ABCDE' would be moved as C'EDCBA'. Very useful if you put a card in the
>>reader backwards, I'm sure, but I for one could never think of a real use
>>for it.
>
>is fatally provincial even in more mundane contexts. Many natural languages
>generate text in one of the last three of the four sequences
>
>Left Left (LL):
>------------------------->
>------------------------->
>-------->
>
>Right Right (RR):
><-------------------------
><-------------------------
><---------------
>
>Left Boustrophedon (LB):
>------------------------->
><-------------------------
>------------->
>
>Right Boustrophedon (RB):
><-------------------------
>------------------------->
> <------
>
>and for them, although not of course for LL and the standard Europoean
>languages, MVCIN is very useful for formatting display or print text.
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