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8264360: Loop strip mining verification fails with "should be on the backedge"

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Reviewed-by: kvn, thartmann
This commit is contained in:
Roland Westrelin 2021-03-30 07:58:49 +00:00
parent 8100a20e98
commit d2a63f259e
2 changed files with 72 additions and 1 deletions
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2
src/hotspot/share/opto/loopnode.cpp
View File

@ -1807,7 +1807,7 @@ void LoopNode::verify_strip_mined(int expect_skeleton) const {
for (DUIterator_Fast jmax, j = be->fast_outs(jmax); j < jmax; j++) {
Node* n = be->fast_out(j);
if (n->is_Load()) {
assert(n->in(0) == be, "should be on the backedge");
assert(n->in(0) == be || n->find_prec_edge(be) > 0, "should be on the backedge");
do {
n = n->raw_out(0);
} while (!n->is_Phi());

71
test/hotspot/jtreg/compiler/loopstripmining/TestLoadOnBackedgeWithPrec.java Normal file
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@ -0,0 +1,71 @@
/*
* 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 8264360
* @summary Loop strip mining verification fails with "should be on the backedge"
*
* @run main/othervm -XX:-TieredCompilation -XX:-BackgroundCompilation TestLoadOnBackedgeWithPrec
*
*/
class a {
int g = 20;
float h = 2;
long b = 6;
}
public class TestLoadOnBackedgeWithPrec {
int c ;
a[] i = {new a()};
float j() {
a k = new a();
float l = 5;
for (int d = 0; d < 8; ++d) {
for (int e = 0; e < 9; ++e) {
k = k;
l *= k.g;
}
for (int f = 0; f < 9; ++f) {
new a();
}
{
a[] m = {
new a(), new a(), new a(),
new a(), new a(), new a(),
new a(), new a(), new a()};
c = i[0].g + k.g;
}
}
return k.h;
}
public static void main(String[] args) {
TestLoadOnBackedgeWithPrec n = new TestLoadOnBackedgeWithPrec();
for (int i = 0; i < 5_000; i++) {
n.j();
}
}
}