/* * Copyright (c) 2022, Red Hat, Inc. 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. */ /* * @test * bug 8280799 * @summary C2: assert(false) failed: cyclic dependency prevents range check elimination * @run main/othervm -XX:-BackgroundCompilation -XX:-UseCountedLoopSafepoints TestPredicateInputBelowLoopPredicate */ public class TestPredicateInputBelowLoopPredicate { private static final Object object = new Object(); private static int fieldStop = 100; private static int[] array = new int[200]; private static int[] array2 = new int[200]; private static int fieldStart = 0; public static void main(String[] args) { for (int i = 0; i < 20_000; i++) { test(true); test(false); } } private static void test(boolean flag) { if (array == null) { } int start = fieldStart; int i = start; for(;;) { int j; for (j = -10; j < 0; j++) { } int stop = fieldStop; // bound check becomes candidate for predication once // loop above is optimized out array[stop - i + j] = 0; // A bunch of stuff to grow loop body size and prevent peeling: array2[0] = 0; array2[1] = 0; array2[2] = 0; array2[3] = 0; array2[4] = 0; array2[5] = 0; array2[6] = 0; array2[7] = 0; array2[8] = 0; array2[9] = 0; array2[10] = 0; array2[11] = 0; array2[12] = 0; array2[13] = 0; array2[14] = 0; array2[15] = 0; array2[16] = 0; array2[17] = 0; array2[18] = 0; array2[19] = 0; array2[20] = 0; array2[21] = 0; array2[22] = 0; array2[23] = 0; array2[24] = 0; array2[25] = 0; array2[26] = 0; array2[27] = 0; array2[28] = 0; array2[29] = 0; array2[30] = 0; array2[31] = 0; array2[32] = 0; array2[33] = 0; array2[34] = 0; array2[35] = 0; array2[36] = 0; array2[37] = 0; array2[38] = 0; array2[39] = 0; array2[40] = 0; array2[41] = 0; array2[42] = 0; array2[43] = 0; array2[44] = 0; array2[45] = 0; array2[46] = 0; array2[47] = 0; array2[48] = 0; array2[49] = 0; array2[50] = 0; array2[51] = 0; array2[52] = 0; array2[53] = 0; array2[54] = 0; array2[55] = 0; array2[56] = 0; array2[57] = 0; array2[58] = 0; array2[59] = 0; array2[60] = 0; array2[61] = 0; array2[62] = 0; array2[63] = 0; array2[64] = 0; array2[65] = 0; array2[66] = 0; array2[67] = 0; array2[68] = 0; array2[69] = 0; array2[70] = 0; array2[71] = 0; array2[72] = 0; array2[73] = 0; array2[74] = 0; array2[75] = 0; array2[76] = 0; array2[77] = 0; array2[78] = 0; array2[79] = 0; array2[80] = 0; array2[81] = 0; array2[82] = 0; array2[83] = 0; array2[84] = 0; array2[85] = 0; array2[86] = 0; array2[87] = 0; array2[88] = 0; array2[89] = 0; array2[90] = 0; array2[91] = 0; array2[92] = 0; array2[93] = 0; array2[94] = 0; array2[95] = 0; array2[96] = 0; array2[97] = 0; array2[98] = 0; array2[99] = 0; array2[100] = 0; array2[101] = 0; array2[102] = 0; array2[103] = 0; array2[104] = 0; array2[105] = 0; array2[106] = 0; array2[107] = 0; array2[108] = 0; array2[109] = 0; array2[110] = 0; array2[111] = 0; array2[112] = 0; array2[113] = 0; array2[114] = 0; array2[115] = 0; array2[116] = 0; array2[117] = 0; array2[118] = 0; array2[119] = 0; array2[120] = 0; array2[121] = 0; array2[122] = 0; array2[123] = 0; array2[124] = 0; array2[125] = 0; array2[126] = 0; array2[127] = 0; array2[128] = 0; array2[129] = 0; array2[130] = 0; array2[131] = 0; array2[132] = 0; array2[133] = 0; array2[134] = 0; array2[135] = 0; array2[136] = 0; array2[137] = 0; array2[138] = 0; array2[139] = 0; array2[140] = 0; array2[141] = 0; array2[142] = 0; array2[143] = 0; array2[144] = 0; array2[145] = 0; array2[146] = 0; array2[147] = 0; array2[148] = 0; array2[149] = 0; array2[150] = 0; array2[151] = 0; array2[152] = 0; array2[153] = 0; array2[154] = 0; array2[155] = 0; array2[156] = 0; array2[157] = 0; array2[158] = 0; array2[159] = 0; array2[160] = 0; array2[161] = 0; array2[162] = 0; array2[163] = 0; array2[164] = 0; array2[165] = 0; array2[166] = 0; array2[167] = 0; array2[168] = 0; array2[169] = 0; array2[170] = 0; array2[171] = 0; array2[172] = 0; array2[173] = 0; array2[174] = 0; array2[175] = 0; array2[176] = 0; array2[177] = 0; array2[178] = 0; array2[179] = 0; array2[180] = 0; array2[181] = 0; array2[182] = 0; array2[183] = 0; array2[184] = 0; array2[185] = 0; array2[186] = 0; array2[187] = 0; array2[188] = 0; array2[189] = 0; array2[190] = 0; array2[191] = 0; array2[192] = 0; array2[193] = 0; array2[194] = 0; array2[195] = 0; array2[196] = 0; array2[197] = 0; array2[198] = 0; array2[199] = 0; i++; if (i == stop) { // requires a loop limit predicate break; } } } }