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8309902: C2: assert(false) failed: Bad graph detected in build_loop_late after JDK-8305189

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Reviewed-by: kvn, chagedorn
This commit is contained in:
Roland Westrelin 2023-06-29 15:05:49 +00:00
parent 05c2b6cd47
commit 26efff7586
2 changed files with 58 additions and 6 deletions
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6
src/hotspot/share/opto/loopTransform.cpp
View File

@ -2043,12 +2043,6 @@ bool IdealLoopTree::is_invariant(Node* n) const {
// to the new stride.
void PhaseIdealLoop::update_main_loop_assertion_predicates(Node* ctrl, CountedLoopNode* loop_head, Node* init,
const int stride_con) {
if (init->Opcode() == Op_CastII) {
// skip over the cast added by PhaseIdealLoop::cast_incr_before_loop() when pre/post/main loops are created because
// it can get in the way of type propagation
assert(((CastIINode*)init)->carry_dependency() && loop_head->skip_predicates() == init->in(0), "casted iv phi from pre loop expected");
init = init->in(1);
}
Node* entry = ctrl;
Node* prev_proj = ctrl;
LoopNode* outer_loop_head = loop_head->skip_strip_mined();

58
test/hotspot/jtreg/compiler/loopopts/TestAssertPredicatePeeling.java Normal file
View File

@ -0,0 +1,58 @@
/*
* 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 8309902
* @summary C2: assert(false) failed: Bad graph detected in build_loop_late after JDK-8305189
* @run main/othervm -Xcomp -XX:CompileCommand=compileonly,TestAssertPredicatePeeling::* TestAssertPredicatePeeling
*/
public class TestAssertPredicatePeeling {
static volatile long instanceCount;
public static void main(String[] strArr) {
test();
}
static int test() {
int i2 = 2, i17 = 3, i18 = 2, iArr[] = new int[10];
int i15 = 1;
while (i15 < 100000) {
for (int i16 = i15; i16 < 1; ++i16) {
try {
iArr[i16] = 5 / iArr[6];
i17 = iArr[5] / i2;
i2 = i15;
} catch (ArithmeticException a_e) {
}
instanceCount -= i15;
}
i15++;
}
return i17;
}
}