Slow code due to many AbstractVector::check and AbstractShuffle::checkIndexes checks in C2

John Rose john.r.rose at
Tue May 26 21:17:02 UTC 2020

On May 26, 2020, at 1:30 PM, Paul Sandoz <paul.sandoz at> wrote:
> We “just" need to optimize the shuffle. I would expect if we are using constant shuffles that the bounds checks can be completely elided.

That’s pretty much the same as vectorizing array range checks
for scatter/gather ops.  If we do that now, we should be able to
adapt the code.  Maybe there’s even a refactoring here, so that
the fiddly business of range checking (a specialty of Java) can
be put in only one place, so we just have to get it right once.

— John

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