public static void checkRedundantPhi(PhiNode phiNode) { if (phiNode.isDeleted() || phiNode.valueCount() == 1) { return; } ValueNode singleValue = phiNode.singleValue(); if (singleValue != null) { Collection<PhiNode> phiUsages = phiNode.usages().filter(PhiNode.class).snapshot(); Collection<ProxyNode> proxyUsages = phiNode.usages().filter(ProxyNode.class).snapshot(); phiNode.graph().replaceFloating(phiNode, singleValue); for (PhiNode phi : phiUsages) { checkRedundantPhi(phi); } for (ProxyNode proxy : proxyUsages) { checkRedundantProxy(proxy); } } }