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On 25-Mar-2014 12:28 -0700, Charles Wilt wrote:
I seem to recall seeing an article or post by Barbara that provided
considerable detail into the intricacies of MOVE and why IBM
depreciated <sic> it by not including it in free form.
Now that fixed-form can appear with little effort or the conspicuous
/free and /end-free tags, any implication that the instructions were
deprecated seems somewhat insincere.
In my mind, I'm calling it "The evils of MOVE"... shades of "The
evils of GOTO" :)
Does anybody else recall this and more importantly do you have a
link to it?
No, but IMO the documentation for the various MOVE* instructions do a
fine job of revealing their evils; i.e. a slew of nuanced effects noted
to be based on the numerous variations on source and target data types
and different sizes. While completely acceptable to have such a highly
overloaded capability, general usages may tend to suffer problems due to
the modified effects when minor changes to the data type or the data
size\length were made; i.e. the changes might be manifest as a compiler
or run-time error, instead of just producing some different results, if
the instruction is not overloaded to that degree. To be clear, I think
the evils are more about code maintenance than new code; i.e. someone
originally choosing to effect explicitly what the MOVE* instruction
provides is likely to get exactly what they want.
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