RFR: ZGC: C2: Don't split loadbarriers past self referencing phi nodes
rwestrel at redhat.com
Fri May 4 15:37:43 UTC 2018
> I found a case when we are trying to split a loadbarrier past a phi
> nodes which has one input that is itself. This is a workaround to just
> skip those. Later we might want to try to remove these nodes earlier in
> loop optimizations, but that is an upstream issue.
I would have thought that PhiNode::Ideal() gets rid of them. AFAICT,
that call would trigger that:
Node* uin = unique_input(phase, false);
So I suppose the cycle is created by some other transformation during
loop opts before the compiler has a chance to run a pass of IGVN?
Looks ok to me.
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