----------------------------------------<snip>--------------------------------
When I learned Assembler, I was taught that registers 0,1,14 and 15
could NEVER be expected to remain unchanged accross a macro invokation.
If I may say so, the lesson was a bit incomplete. To be more correct,
change the word "never" to "not" and add "unless the macro documented
otherwise".
And of course any macro might document non-standard linkage conventions
(such as SETLOCK which by default modifies registers 11,12,13) that the
user must accommodate.
Peter Relson
z/OS Core Technology Design
--------------------------------------<unsnip>----------------------------------------
I won't disagree with you, Peter, but my lesson was delivered when
OS/360 R16.6 was the lastest thing on the street.
The next "lesson" came via OJT: "There's no excuse for not reading the doc."
Rick
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