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/*
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58299
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* Copyright (c) 2012, 2019, Oracle and/or its affiliates. All rights reserved.
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43972
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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50858
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package org.graalvm.compiler.core.test;
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import org.graalvm.compiler.core.common.type.IntegerStamp;
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import org.graalvm.compiler.nodes.StructuredGraph;
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import org.graalvm.compiler.nodes.StructuredGraph.AllowAssumptions;
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import org.graalvm.compiler.phases.common.CanonicalizerPhase;
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import org.graalvm.compiler.phases.common.DeadCodeEliminationPhase;
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import org.junit.Test;
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/**
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* This class tests some specific patterns the stamp system should be able to canonicalize away
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* using {@link IntegerStamp#upMask()}.
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*/
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public class StampCanonicalizerTest extends GraalCompilerTest {
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public static int andStamp(int a, int b) {
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int v = (a & 0xffff00) & (b & 0xff0000f);
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return v & 1;
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}
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@Test
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public void testAnd() {
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testZeroReturn("andStamp");
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}
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public static int shiftLeftStamp1(int a) {
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int v = a << 1;
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return v & 1;
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}
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public static int shiftLeftStamp2(int a) {
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int v = a << 1;
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if (a == 17) {
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v = a * 4;
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}
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return v & 1;
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}
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@Test
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public void testShift() {
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testZeroReturn("shiftLeftStamp1");
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testZeroReturn("shiftLeftStamp2");
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}
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public static int upperBoundShiftStamp1(int a) {
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int v = a & 0xffff;
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return (v << 4) & 0xff00000;
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}
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public static int upperBoundShiftStamp2(int a) {
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int v = a & 0xffff;
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return (v >> 4) & 0xf000;
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}
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@Test
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public void testUpperBoundShift() {
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testZeroReturn("upperBoundShiftStamp1");
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testZeroReturn("upperBoundShiftStamp2");
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}
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public static int divStamp1(int[] a) {
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int v = a.length / 4;
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return v & 0x80000000;
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}
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public static int divStamp2(int[] a) {
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int v = a.length / 5;
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return v & 0x80000000;
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}
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@Test
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public void testDiv() {
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testZeroReturn("divStamp1");
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testZeroReturn("divStamp2");
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}
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public static int distinctMask(int a, int b) {
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int x = a & 0xaaaa;
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int y = (b & 0x5555) | 0x1;
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return x == y ? 1 : 0;
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}
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@Test
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public void testDistinctMask() {
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testZeroReturn("distinctMask");
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}
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private void testZeroReturn(String methodName) {
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StructuredGraph graph = parseEager(methodName, AllowAssumptions.YES);
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new CanonicalizerPhase().apply(graph, getProviders());
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new DeadCodeEliminationPhase().apply(graph);
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assertConstantReturn(graph, 0);
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}
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}
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