On Wed, 30 Jul 2008 08:57:49 -0500, Jeff Holst wrote: > >IBM's out was that they had said that the results of the overlappping MOVE >were unpredictable, so this did not violate their compatablity statement that >programs would be source level compatable if they were coded according to >the language reference. As we commented at the time, the results were >predictable (the compiler does not take random actions), but the results might >change with future releases. > I dealt once with a compiler vendor when I had a program that got an error trap which vanished when I enabled debugging/tracing (which then generated unoptimized code). The vendor shrugged and pointed out (accurately) that the construct I misused was documented as having unpredictable (perhaps "undefined") effect. Didn't help me much with my debugging.
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