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8315088: C2: assert(wq.size() - before == EMPTY_LOOP_SIZE) failed: expect the EMPTY_LOOP_SIZE nodes of this body if empty

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Reviewed-by: thartmann, chagedorn
This commit is contained in:
Roland Westrelin 2023-09-05 07:32:51 +00:00
parent 8bbebbba8f
commit fe4f90021f
2 changed files with 55 additions and 1 deletions
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2
src/hotspot/share/opto/loopTransform.cpp
View File

@ -3530,7 +3530,7 @@ void IdealLoopTree::enqueue_data_nodes(PhaseIdealLoop* phase, Unique_Node_List&
void IdealLoopTree::collect_loop_core_nodes(PhaseIdealLoop* phase, Unique_Node_List& wq) const {
uint before = wq.size();
wq.push(_head->in(LoopNode::LoopBackControl));
for (uint i = 0; i < wq.size(); ++i) {
for (uint i = before; i < wq.size(); ++i) {
Node* n = wq.at(i);
for (uint j = 0; j < n->req(); ++j) {
Node* in = n->in(j);

54
test/hotspot/jtreg/compiler/loopstripmining/TestBrokenEmptyLoopLogic.java Normal file
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@ -0,0 +1,54 @@
/*
* Copyright (c) 2023, 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 8315088
* @requires vm.compiler2.enabled
* @summary C2: assert(wq.size() - before == EMPTY_LOOP_SIZE) failed: expect the EMPTY_LOOP_SIZE nodes of this body if empty
* @run main/othervm -Xbatch -XX:CompileCommand=compileonly,TestBrokenEmptyLoopLogic::* -XX:-TieredCompilation TestBrokenEmptyLoopLogic
*
*/
public class TestBrokenEmptyLoopLogic {
public static void main(String[] strArr) {
for (int i = 0; i < 10000; i++) {
test();
}
}
static void test() {
int i8 = 209, i = 1, i12 = 1;
while (++i < 8) {
for (int j = 5; j > 1; j -= 2) {
i12 = 1;
do {
} while (++i12 < 3);
}
for (int j = i; j < 5; ++j) {
i8 += i12;
}
}
}
}