"This was a known - and to my mind indefensible - issue with the z900
machines."

Been going on for years.  Remember Sharp APL?  Did a nasty STC into a following 
branch
instruction and blew the pipeline to smithereens on the old NAS AS/9000 series. 
 Happened in a
tight and frequently used loop.  Of course, code alteration is several times 
worse than simple
non-reentrancy.  There ought to be a coding lab on Elba.

There was also an issue with a TRT in GDDM

Someone will come up with a code problem on STRETCH fairly soon.

-- 
  Phil Payne
  http://www.isham-research.co.uk
  +44 7833 654 800

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