Mercurial > hg > truffle
view graal/com.oracle.graal.compiler.hsail.test/src/com/oracle/graal/compiler/hsail/test/IntLookupSwitchTest.java @ 17051:c25fcf343b4f
improved javadoc for NodeClass.is()
author | Doug Simon <doug.simon@oracle.com> |
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date | Thu, 04 Sep 2014 22:33:17 +0200 |
parents | 64dcb92ee75a |
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/* * Copyright (c) 2009, 2013, 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 com.oracle.graal.compiler.hsail.test; import org.junit.*; import com.oracle.graal.compiler.hsail.test.infra.*; /** * Tests a switch statement with integer keys. This test exercises the LOOKUPSWITCH Java bytecode * instruction. * * The HSAIL code generated for this example is a series of cascading compare and branch * instructions for each case of the switch. * * These HSAIL instructions have the following form: * * * //Check whether the key matches the key constant of the case. Store the result of the compare (0 * or 1) in the control register c0. * * cmp_eq $c0 <source register>, <key constant for case statement> * * //Branch to the corresponding label of that case if there's a match. * * cbr $c0 <branch target for that case> */ public class IntLookupSwitchTest extends GraalKernelTester { static final int num = 20; // Output array storing the results of the operations. @Result protected int[] outArray = new int[num]; /** * The static "kernel" method we will be testing. This method writes to an output array based on * switching on an element of an input array. By convention the gid is the last parameter. * * Note: Because the key constants used in the cases of the switch are sparsely distributed, the * Java source compiler compiles this example into the LOOKUPSWITCH bytecode instruction. So * this is really a test to see whether the HSAIL backend is appropriately handling the * LOOKUPSWITCH bytecode. * * @param out the output array * @param ina the input array * @param gid the parameter used to index into the input and output arrays */ public static void run(int[] out, int[] ina, int gid) { switch (ina[gid]) { case 0: out[gid] = ina[gid]; break; case 1: case 2: break; case 5: out[gid] = ina[gid] * ina[gid]; break; case 10: out[gid] = -ina[gid]; break; case 15: out[gid] = ina[gid] - ina[gid]; break; case 19: out[gid] = ina[gid] + ina[gid]; break; default: out[gid] = 9; break; } out[gid] += ina[gid]; } /** * Tests the HSAIL code generated for this unit test by comparing the result of executing this * code with the result of executing a sequential Java version of this unit test. */ @Test public void test() { super.testGeneratedHsail(); } /** * Initializes the input and output arrays passed to the run routine. * * @param in the input array */ void setupArrays(int[] in) { for (int i = 0; i < num; i++) { in[i] = i < num / 2 ? i : -i; outArray[i] = 0; } } /** * Dispatches the HSAIL kernel for this test case. */ @Override public void runTest() { int[] inArray = new int[num]; setupArrays(inArray); dispatchMethodKernel(num, outArray, inArray); } }