public static void checkRedundantProxy(ProxyNode vpn) {
if (vpn.isDeleted()) {
return;
}
BeginNode proxyPoint = vpn.proxyPoint();
if (proxyPoint instanceof LoopExitNode) {
LoopExitNode exit = (LoopExitNode) proxyPoint;
LoopBeginNode loopBegin = exit.loopBegin();
Node vpnValue = vpn.value();
for (ValueNode v : loopBegin.stateAfter().values()) {
ValueNode v2 = v;
if (loopBegin.isPhiAtMerge(v2)) {
v2 = ((PhiNode) v2).valueAt(loopBegin.forwardEnd());
}
if (vpnValue == v2) {
Collection<PhiNode> phiUsages = vpn.usages().filter(PhiNode.class).snapshot();
Collection<ProxyNode> proxyUsages = vpn.usages().filter(ProxyNode.class).snapshot();
vpn.graph().replaceFloating(vpn, vpnValue);
for (PhiNode phi : phiUsages) {
checkRedundantPhi(phi);
}
for (ProxyNode proxy : proxyUsages) {
checkRedundantProxy(proxy);
}
return;
}
}
}
}
