RFR(S): 8224496: Shenandoah compilation fails with assert(is_CountedLoopEnd()) failed: invalid node class

Roland Westrelin rwestrel at redhat.com
Wed May 22 09:06:40 UTC 2019


Expanding a barrier in the outer loop of a strip mined loop nest
confuses the loop strip mining verification logic. This is not a new
problem and the way this relatively rare case has been handled so far is
by turning the outer strip mined loop into a regular loop so the
verification logic doesn't trigger. In the move to the new barrier
scheme, some of that logic was dropped. This fix puts it back and also
fixes a bug that it causes.


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