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8308660: C2 compilation hits 'node must be dead' assert

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Reviewed-by: chagedorn, kvn
This commit is contained in:
Roland Westrelin 2024-03-19 07:57:53 +00:00
parent e1b0af29e4
commit 053ff76e14
2 changed files with 73 additions and 0 deletions
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4
src/hotspot/share/opto/ifnode.cpp
View File

@ -1051,6 +1051,10 @@ bool IfNode::fold_compares_helper(ProjNode* proj, ProjNode* success, ProjNode* f
}
hook->destruct(igvn);
if (adjusted_val->is_top() || adjusted_lim->is_top()) {
return false;
}
if (igvn->type(adjusted_lim)->is_int()->_lo < 0 &&
!igvn->C->post_loop_opts_phase()) {
// If range check elimination applies to this comparison, it includes code to protect from overflows that may

69
test/hotspot/jtreg/compiler/c2/TestFoldIfRemovesTopNode.java Normal file
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@ -0,0 +1,69 @@
/*
* Copyright (c) 2024, 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 8308660
* @summary C2 compilation hits 'node must be dead' assert
* @requires vm.compiler2.enabled
* @run main/othervm -XX:-BackgroundCompilation -XX:-TieredCompilation -XX:-UseOnStackReplacement
* -XX:+UnlockDiagnosticVMOptions -XX:+StressIGVN -XX:StressSeed=242006623 TestFoldIfRemovesTopNode
* @run main/othervm -XX:-BackgroundCompilation -XX:-TieredCompilation -XX:-UseOnStackReplacement
* -XX:+UnlockDiagnosticVMOptions -XX:+StressIGVN TestFoldIfRemovesTopNode
*
*/
public class TestFoldIfRemovesTopNode {
public static void main(String[] args) {
int[] array = new int[100];
for (int i = 0; i < 20_000; i++) {
test(false, true, 0, array);
test(false, false, 0, array);
testHelper2(false, false, 0, array);
testHelper(0, true, array);
}
}
private static void test(boolean flag, boolean flag2, int k, int[] array) {
if (flag2) {
testHelper2(flag, flag2, k, array);
}
}
private static void testHelper2(boolean flag, boolean flag2, int k, int[] array) {
if (flag2) {
k = -1;
}
testHelper(k, flag, array);
}
private static void testHelper(int k, boolean flag, int[] array) {
if (flag) {
k = new int[k].length;
int j = k + 3;
if (j >= 0 && j <= array.length) {
}
}
}
}