Examples with PhiNode org.graalvm.compiler.nodes.PhiNode used on opensource projects

Example 41 with PhiNode

use of org.graalvm.compiler.nodes.PhiNode in project graal by oracle.

the class ValueMergeUtil method mergeValueProducers.

public static <T> ValueNode mergeValueProducers(AbstractMergeNode merge, List<? extends T> valueProducers, Function<T, FixedWithNextNode> lastInstrFunction, Function<T, ValueNode> valueFunction) {
    ValueNode singleResult = null;
    PhiNode phiResult = null;
    for (T valueProducer : valueProducers) {
        ValueNode result = valueFunction.apply(valueProducer);
        if (result != null) {
            if (phiResult == null && (singleResult == null || singleResult == result)) {
                /* Only one result value, so no need yet for a phi node. */
                singleResult = result;
            } else if (phiResult == null) {
                /* Found a second result value, so create phi node. */
                phiResult = merge.graph().addWithoutUnique(new ValuePhiNode(result.stamp(NodeView.DEFAULT).unrestricted(), merge));
                for (int i = 0; i < merge.forwardEndCount(); i++) {
                    phiResult.addInput(singleResult);
                }
                phiResult.addInput(result);
            } else {
                /* Multiple return values, just add to existing phi node. */
                phiResult.addInput(result);
            }
        }
        // create and wire up a new EndNode
        EndNode endNode = merge.graph().add(new EndNode());
        merge.addForwardEnd(endNode);
        if (lastInstrFunction == null) {
            assert valueProducer instanceof ReturnNode || valueProducer instanceof UnwindNode;
            ((ControlSinkNode) valueProducer).replaceAndDelete(endNode);
        } else {
            FixedWithNextNode lastInstr = lastInstrFunction.apply(valueProducer);
            lastInstr.setNext(endNode);
        }
    }
    if (phiResult != null) {
        assert phiResult.verify();
        phiResult.inferStamp();
        return phiResult;
    } else {
        return singleResult;
    }
}