642d2ddcbc
Do not try to verify strip mining if the strip mined loop is malformed. Reviewed-by: roland, vlivanov
101 lines
3.2 KiB
Java
101 lines
3.2 KiB
Java
/*
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* Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
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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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/*
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* @test
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* @bug 8235452
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* @library /test/lib /
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* @summary Test loop strip mining verification with dying outer loop.
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* @run main/othervm -Xbatch -XX:-TieredCompilation
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* compiler.loopstripmining.TestDeadOuterStripMinedLoop
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*/
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package compiler.loopstripmining;
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import jdk.test.lib.Asserts;
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public class TestDeadOuterStripMinedLoop {
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public static int test(boolean b) {
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int res = 5000;
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for (int i = 0; i < 42; i++) {
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if (!b) {
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break;
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}
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// Strip mined loop
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while (--res > 0) {
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if (res < 1) {
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throw new RuntimeException("Should not reach here!");
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}
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}
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/*
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After parsing:
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Loop:
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res--;
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if (res <= 0) {
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goto End;
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}
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if (res < 1) { <- Treated as loop exit check (res <= 0)
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UncommonTrap();
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}
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goto Loop;
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End:
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Loop opts convert this into:
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// Outer strip mined loop
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do {
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// Strip mined loop
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do {
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res--;
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if (res <= 0) {
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goto End;
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}
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} while (res > 0); <- Always false due to above res <= 0 check
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Safepoint()
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} while (false);
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UncommonTrap();
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End:
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The safepoint path dies, because the exit condition of the strip mined loop is always false:
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// Strip mined loop
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do {
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res--;
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if (res <= 0) {
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goto End;
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}
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} while (true);
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End:
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*/
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}
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return res;
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}
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public static void main(String[] args) {
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for (int i = 0; i < 100; i++) {
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Asserts.assertEQ(test(true), -41);
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}
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Asserts.assertEQ(test(false), 5000);
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}
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}
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