test/hotspot/jtreg/compiler/loopopts/BadPredicateAfterPartialPeel.java

/*
 * Copyright (c) 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.
 */

/**
 * @test
 * @bug 8146792
 * @summary Predicate moved after partial peel may lead to broken graph
 * @run main/othervm -XX:-TieredCompilation -XX:-BackgroundCompilation
 *      -XX:-UseOnStackReplacement
 *      -XX:CompileCommand=compileonly,compiler.loopopts.BadPredicateAfterPartialPeel::m
 *      -XX:CompileCommand=dontinline,compiler.loopopts.BadPredicateAfterPartialPeel::not_inlined*
 *      -XX:CompileCommand=quiet
 *      compiler.loopopts.BadPredicateAfterPartialPeel
 */

package compiler.loopopts;

public class BadPredicateAfterPartialPeel {

    static void not_inlined1() {}
    static void not_inlined4() {}

    static int m_helper(int i, int i3, int i4) {
        return i3 == 4 ? i4 : i;
    }

    static float[] array = new float[1000];
    static int[] array2 = new int[1000];

    boolean flag;
    int j;

    static void m(BadPredicateAfterPartialPeel o1, BadPredicateAfterPartialPeel o2, BadPredicateAfterPartialPeel o, int i4) {
        int i1 = 1;

        // To delay partial peeling to the loop opts pass right before CCP
        int i2 = 0;
        for (; i2 < 10; i2 += i1);
        i2 = i2 / 10;

        // Simplified during CCP:
        int i3 = 2;
        for (; i3 < 4; i3 *= 2);

        // Loop is partial peeled right before CCP
        int i = 0;
        boolean b = true;

        not_inlined1();

        array[0] = -1;
        do {
            // peeled section starts here
            o.flag = false;
            o.j = 0;

            if (b) {
                // The following store will be pinned between
                // predicates and the loop after partial peeling. All
                // control flow will be optimized out and so nothing
                // will prevent predicates from being moved out the
                // loop.
                array[i] = 0;
            }
            if (array[0] != 0) {
            }
            if (i >= 10) {
                // peeled section ends here
                return;
            }
            i += i2;
            b = false;
            int i5 = m_helper(i, i3, i4); // This will be simpliflied during CCP
            if (array[i5] != 0) { // and this will become a predicate
            }
            if (o2.flag) {
            }
            // 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;
            if (o1.j >= 20) {
                break;
            }
            o1.j++;
        } while(true);
        not_inlined4();
    }

    static public void main(String[] args) {
        BadPredicateAfterPartialPeel o1 = new BadPredicateAfterPartialPeel();
        BadPredicateAfterPartialPeel o2 = new BadPredicateAfterPartialPeel();
        for (int i = 0; i < 20000; i++) {
            o1.j = 0;
            m(o1, o2, o2, 0);
            m_helper(i, 2, i); // pollute profile
        }
    }
}