| /* |
| * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package org.graalvm.compiler.loop; |
| |
| import org.graalvm.compiler.core.common.type.IntegerStamp; |
| import org.graalvm.compiler.nodes.FixedNode; |
| import org.graalvm.compiler.nodes.StructuredGraph; |
| import org.graalvm.compiler.nodes.ValueNode; |
| import org.graalvm.compiler.nodes.calc.BinaryArithmeticNode; |
| import org.graalvm.compiler.nodes.calc.SignedDivNode; |
| |
| /** |
| * Utility methods to perform integer math with some obvious constant folding first. |
| */ |
| public class MathUtil { |
| private static boolean isConstantOne(ValueNode v1) { |
| return v1.isConstant() && v1.stamp() instanceof IntegerStamp && v1.asJavaConstant().asLong() == 1; |
| } |
| |
| private static boolean isConstantZero(ValueNode v1) { |
| return v1.isConstant() && v1.stamp() instanceof IntegerStamp && v1.asJavaConstant().asLong() == 0; |
| } |
| |
| public static ValueNode add(StructuredGraph graph, ValueNode v1, ValueNode v2) { |
| if (isConstantZero(v1)) { |
| return v2; |
| } |
| if (isConstantZero(v2)) { |
| return v1; |
| } |
| return BinaryArithmeticNode.add(graph, v1, v2); |
| } |
| |
| public static ValueNode mul(StructuredGraph graph, ValueNode v1, ValueNode v2) { |
| if (isConstantOne(v1)) { |
| return v2; |
| } |
| if (isConstantOne(v2)) { |
| return v1; |
| } |
| return BinaryArithmeticNode.mul(graph, v1, v2); |
| } |
| |
| public static ValueNode sub(StructuredGraph graph, ValueNode v1, ValueNode v2) { |
| if (isConstantZero(v2)) { |
| return v1; |
| } |
| return BinaryArithmeticNode.sub(graph, v1, v2); |
| } |
| |
| public static ValueNode divBefore(StructuredGraph graph, FixedNode before, ValueNode dividend, ValueNode divisor) { |
| if (isConstantOne(divisor)) { |
| return dividend; |
| } |
| SignedDivNode div = graph.add(new SignedDivNode(dividend, divisor)); |
| graph.addBeforeFixed(before, div); |
| return div; |
| } |
| } |