1 /* 2 * Copyright (c) 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 package compiler.runtime; 25 26 /* 27 * @test 28 * @summary testing deoptimization on safepoint with floating point values on stack 29 * @bug 8202710 30 * @run main/othervm -XX:+DeoptimizeALot 31 * -XX:+UnlockDiagnosticVMOptions -XX:+IgnoreUnrecognizedVMOptions 32 * compiler.runtime.TestFloatsOnStackDeopt 33 */ 34 35 public class TestFloatsOnStackDeopt { 36 37 private static final int ARRLEN = 97; 38 private static final int ITERS1 = 100; 39 private static final int ITERS2 = 40000; 40 private static final float VALUE = 15.f; 41 public static String dummyString = "long long string"; 42 static volatile boolean pleaseStop = false; 43 run_loop_with_safepoint(float[] a0, float b)44 static void run_loop_with_safepoint(float[] a0, float b) { 45 // Non-counted loop with safepoint. 46 for (long l = 0; l < ITERS2; l++) { 47 // Counted and vectorized loop. 48 for (int i = 0; i < a0.length; i += 1) { 49 a0[i] += b; 50 } 51 } 52 } 53 test()54 static int test() { 55 // thread provokes frequent GC - together with +DeoptimizeALot and safepoint it forces executed function deoptimization 56 Thread th = new Thread() { 57 public void run() { 58 while (!pleaseStop) { 59 synchronized(this) { try { wait(1); } catch (Exception ex) {} } 60 dummyString = new StringBuilder(dummyString).append(dummyString).toString(); 61 if (dummyString.length() > 1024*1024) { dummyString = "long long string"; } 62 } 63 } 64 }; 65 th.start(); 66 67 int errn = 0; 68 for (int j = 0; j < ITERS1; j++) { 69 float[] x0 = new float[ARRLEN]; 70 run_loop_with_safepoint(x0, VALUE); 71 for (int i = 0; i < ARRLEN; i++) { 72 if (x0[i] != VALUE * ITERS2) { 73 System.err.println("(" + j + "): " + "x0[" + i + "] = " + x0[i] + " != " + VALUE * ITERS2); 74 errn++; 75 } 76 x0[i] = 0.f; // Reset 77 } 78 if (errn > 0) break; 79 } 80 81 pleaseStop = true; 82 try { 83 th.join(); 84 } catch (InterruptedException e) { 85 throw new Error("InterruptedException in main thread ", e); 86 } 87 return errn; 88 } 89 main(String args[])90 public static void main(String args[]) { 91 int errn = test(); 92 System.err.println((errn > 0) ? "FAILED" : "PASSED"); 93 } 94 } 95 96