package org.graalvm.compiler.nodes.calc;
import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_1;
import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_1;
import java.io.Serializable;
import java.util.function.Function;
import org.graalvm.compiler.core.common.type.ArithmeticOpTable;
import org.graalvm.compiler.core.common.type.ArithmeticOpTable.ShiftOp;
import org.graalvm.compiler.core.common.type.IntegerStamp;
import org.graalvm.compiler.core.common.type.Stamp;
import org.graalvm.compiler.graph.NodeClass;
import org.graalvm.compiler.graph.spi.CanonicalizerTool;
import org.graalvm.compiler.nodeinfo.NodeInfo;
import org.graalvm.compiler.nodes.ArithmeticOperation;
import org.graalvm.compiler.nodes.ConstantNode;
import org.graalvm.compiler.nodes.NodeView;
import org.graalvm.compiler.nodes.ValueNode;
import org.graalvm.compiler.nodes.spi.ArithmeticLIRLowerable;
import jdk.vm.ci.code.CodeUtil;
import jdk.vm.ci.meta.JavaConstant;
import jdk.vm.ci.meta.JavaKind;
@NodeInfo(cycles = CYCLES_1, size = SIZE_1)
public abstract class ShiftNode<OP> extends BinaryNode implements ArithmeticOperation, ArithmeticLIRLowerable, NarrowableArithmeticNode {
@SuppressWarnings("rawtypes") public static final NodeClass<ShiftNode> TYPE = NodeClass.create(ShiftNode.class);
protected interface SerializableShiftFunction<T> extends Function<ArithmeticOpTable, ShiftOp<T>>, Serializable {
}
protected final SerializableShiftFunction<OP> getOp;
protected ShiftNode(NodeClass<? extends ShiftNode<OP>> c, SerializableShiftFunction<OP> getOp, ValueNode x, ValueNode s) {
super(c, getOp.apply(ArithmeticOpTable.forStamp(x.stamp(NodeView.DEFAULT))).foldStamp(x.stamp(NodeView.DEFAULT), (IntegerStamp) s.stamp(NodeView.DEFAULT)), x, s);
assert ((IntegerStamp) s.stamp(NodeView.DEFAULT)).getBits() == 32;
this.getOp = getOp;
}
protected final ShiftOp<OP> getOp(ValueNode forValue) {
return getOp.apply(ArithmeticOpTable.forStamp(forValue.stamp(NodeView.DEFAULT)));
}
@Override
public final ShiftOp<OP> getArithmeticOp() {
return getOp(getX());
}
@Override
public Stamp foldStamp(Stamp stampX, Stamp stampY) {
return getArithmeticOp().foldStamp(stampX, (IntegerStamp) stampY);
}
@Override
public ValueNode canonical(CanonicalizerTool tool, ValueNode forX, ValueNode forY) {
NodeView view = NodeView.from(tool);
ValueNode valueNode = canonical(getOp(forX), stamp(NodeView.DEFAULT), forX, forY, view);
if (valueNode != null) {
return valueNode;
}
return this;
}
@SuppressWarnings("unused")
public static <OP> ValueNode canonical(ShiftOp<OP> op, Stamp stamp, ValueNode forX, ValueNode forY, NodeView view) {
if (forX.isConstant() && forY.isConstant()) {
JavaConstant amount = forY.asJavaConstant();
assert amount.getJavaKind() == JavaKind.Int;
return ConstantNode.forPrimitive(stamp, op.foldConstant(forX.asConstant(), amount.asInt()));
}
return null;
}
public int getShiftAmountMask() {
return getArithmeticOp().getShiftAmountMask(stamp(NodeView.DEFAULT));
}
@Override
public boolean isNarrowable(int resultBits) {
assert CodeUtil.isPowerOf2(resultBits);
int narrowMask = resultBits - 1;
int wideMask = getShiftAmountMask();
assert (wideMask & narrowMask) == narrowMask : String.format("wideMask %x should be wider than narrowMask %x", wideMask, narrowMask);
IntegerStamp yStamp = (IntegerStamp) getY().stamp(NodeView.DEFAULT);
return (yStamp.upMask() & (wideMask & ~narrowMask)) == 0;
}
}