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8260407: cmp != __null && cmp->Opcode() == Op_CmpL failure with -XX:StressLongCountedLoop=200000000 in lucene

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Reviewed-by: thartmann, kvn
This commit is contained in:
Roland Westrelin 2021-01-28 12:27:40 +00:00
parent d07af2b8ec
commit 11d6467c50
2 changed files with 73 additions and 1 deletions
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2
src/hotspot/share/opto/loopopts.cpp
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@ -1151,7 +1151,7 @@ Node *PhaseIdealLoop::place_near_use(Node *useblock) const {
bool PhaseIdealLoop::identical_backtoback_ifs(Node *n) {
if (!n->is_If() || n->is_CountedLoopEnd()) {
if (!n->is_If() || n->is_BaseCountedLoopEnd()) {
return false;
}
if (!n->in(0)->is_Region()) {

72
test/hotspot/jtreg/compiler/longcountedloops/TestLongCountedLoopSplitIf.java Normal file
View file

@ -0,0 +1,72 @@
/*
* Copyright (c) 2021, 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 8260407
* @summary cmp != __null && cmp->Opcode() == Op_CmpL failure with -XX:StressLongCountedLoop=200000000 in lucene
*
* @run main/othervm -XX:-BackgroundCompilation TestLongCountedLoopSplitIf
*
*/
public class TestLongCountedLoopSplitIf {
public static void main(String[] args) {
for (int i = 0; i < 20_000; i++) {
test(0, 100);
test_helper(100, 0, 0);
}
}
private static float test(long start, long stop) {
for (int i = 0; i < 10; i++) {
for (int j = 0; j < 10; j++) {
}
}
float res = 1;
long l = start;
for (; ; ) {
res = test_helper(l, stop, res);
if (shouldStop(l, stop)) {
break;
}
l++;
}
return res;
}
private static boolean shouldStop(long l, long stop) {
return l >= stop;
}
private static float test_helper(long l, long stop, float res) {
if (l < stop) {
res += l;
} else {
res *= l;
}
return res;
}
}