1 /* 2 * Copyright (c) 2011, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 25 package org.graalvm.compiler.nodes.calc; 26 27 import org.graalvm.compiler.core.common.type.ArithmeticOpTable; 28 import org.graalvm.compiler.core.common.type.ArithmeticOpTable.BinaryOp; 29 import org.graalvm.compiler.core.common.type.ArithmeticOpTable.BinaryOp.Xor; 30 import org.graalvm.compiler.core.common.type.PrimitiveStamp; 31 import org.graalvm.compiler.core.common.type.Stamp; 32 import org.graalvm.compiler.graph.NodeClass; 33 import org.graalvm.compiler.graph.spi.Canonicalizable.BinaryCommutative; 34 import org.graalvm.compiler.graph.spi.CanonicalizerTool; 35 import org.graalvm.compiler.lir.gen.ArithmeticLIRGeneratorTool; 36 import org.graalvm.compiler.nodeinfo.NodeInfo; 37 import org.graalvm.compiler.nodes.ConstantNode; 38 import org.graalvm.compiler.nodes.NodeView; 39 import org.graalvm.compiler.nodes.ValueNode; 40 import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool; 41 import org.graalvm.compiler.nodes.util.GraphUtil; 42 43 import jdk.vm.ci.code.CodeUtil; 44 import jdk.vm.ci.meta.Constant; 45 import jdk.vm.ci.meta.PrimitiveConstant; 46 47 @NodeInfo(shortName = "^") 48 public final class XorNode extends BinaryArithmeticNode<Xor> implements BinaryCommutative<ValueNode>, NarrowableArithmeticNode { 49 50 public static final NodeClass<XorNode> TYPE = NodeClass.create(XorNode.class); 51 XorNode(ValueNode x, ValueNode y)52 public XorNode(ValueNode x, ValueNode y) { 53 super(TYPE, ArithmeticOpTable::getXor, x, y); 54 assert x.stamp(NodeView.DEFAULT).isCompatible(y.stamp(NodeView.DEFAULT)); 55 } 56 create(ValueNode x, ValueNode y, NodeView view)57 public static ValueNode create(ValueNode x, ValueNode y, NodeView view) { 58 BinaryOp<Xor> op = ArithmeticOpTable.forStamp(x.stamp(view)).getXor(); 59 Stamp stamp = op.foldStamp(x.stamp(view), y.stamp(view)); 60 ConstantNode tryConstantFold = tryConstantFold(op, x, y, stamp, view); 61 if (tryConstantFold != null) { 62 return tryConstantFold; 63 } 64 return canonical(null, op, stamp, x, y, view); 65 } 66 67 @Override canonical(CanonicalizerTool tool, ValueNode forX, ValueNode forY)68 public ValueNode canonical(CanonicalizerTool tool, ValueNode forX, ValueNode forY) { 69 ValueNode ret = super.canonical(tool, forX, forY); 70 if (ret != this) { 71 return ret; 72 } 73 74 NodeView view = NodeView.from(tool); 75 return canonical(this, getOp(forX, forY), stamp(NodeView.DEFAULT), forX, forY, view); 76 } 77 canonical(XorNode self, BinaryOp<Xor> op, Stamp stamp, ValueNode forX, ValueNode forY, NodeView view)78 private static ValueNode canonical(XorNode self, BinaryOp<Xor> op, Stamp stamp, ValueNode forX, ValueNode forY, NodeView view) { 79 if (GraphUtil.unproxify(forX) == GraphUtil.unproxify(forY)) { 80 return ConstantNode.forPrimitive(stamp, op.getZero(forX.stamp(view))); 81 } 82 if (forX.isConstant() && !forY.isConstant()) { 83 return new XorNode(forY, forX); 84 } 85 if (forY.isConstant()) { 86 Constant c = forY.asConstant(); 87 if (op.isNeutral(c)) { 88 return forX; 89 } 90 91 if (c instanceof PrimitiveConstant && ((PrimitiveConstant) c).getJavaKind().isNumericInteger()) { 92 long rawY = ((PrimitiveConstant) c).asLong(); 93 long mask = CodeUtil.mask(PrimitiveStamp.getBits(stamp)); 94 if ((rawY & mask) == mask) { 95 return new NotNode(forX); 96 } 97 } 98 return reassociate(self != null ? self : (XorNode) new XorNode(forX, forY).maybeCommuteInputs(), ValueNode.isConstantPredicate(), forX, forY, view); 99 } 100 return self != null ? self : new XorNode(forX, forY).maybeCommuteInputs(); 101 } 102 103 @Override generate(NodeLIRBuilderTool nodeValueMap, ArithmeticLIRGeneratorTool gen)104 public void generate(NodeLIRBuilderTool nodeValueMap, ArithmeticLIRGeneratorTool gen) { 105 nodeValueMap.setResult(this, gen.emitXor(nodeValueMap.operand(getX()), nodeValueMap.operand(getY()))); 106 } 107 } 108