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8289954: C2: Assert failed in PhaseCFG::verify() after JDK-8183390
Reviewed-by: kvn, thartmann, roland
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Pengfei Li
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Jul 18, 2022
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test/hotspot/jtreg/compiler/loopopts/TestUnreachableInnerLoop.java
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/* | ||
* Copyright (c) 2022, Arm Limited. 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. | ||
*/ | ||
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/** | ||
* @test | ||
* @bug 8289954 | ||
* @summary C2: Assert failed in PhaseCFG::verify() after JDK-8183390 | ||
* | ||
* @run main/othervm -Xcomp -Xbatch | ||
* -XX:CompileOnly=compiler/loopopts/TestUnreachableInnerLoop | ||
* compiler.loopopts.TestUnreachableInnerLoop | ||
*/ | ||
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package compiler.loopopts; | ||
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public class TestUnreachableInnerLoop { | ||
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public static int field = 0; | ||
public static int arr[] = new int[500]; | ||
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public static void fun() { | ||
for (int elem : arr) { | ||
int x = 1, y = 2, z = 3; | ||
int i, j; | ||
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// This is a good loop | ||
for (i = 2; i < 63; i++) { | ||
arr[i] = arr[i] + 3592870; | ||
} | ||
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// The inner loop looks quite complex but it's unreachable | ||
// code as loop condition "k < 2" never satisfies | ||
for (j = 3; j < 63; j++) { | ||
for (int k = j; k < 2; k++) { | ||
arr[j] <<= k; | ||
try { | ||
x = k / i; | ||
y = j % 6; | ||
arr[k] = 88 % elem; | ||
} catch (ArithmeticException ex) {} | ||
switch (2) { | ||
case 2: { | ||
try { | ||
y = arr[j] % y; | ||
z = x / 2345; | ||
elem = j % -2; | ||
} catch (ArithmeticException ex) {} | ||
break; | ||
} | ||
case 3: { | ||
y = arr[j] / 2; | ||
z -= k; | ||
break; | ||
} | ||
} | ||
arr[100] -= j; | ||
field += k; | ||
} | ||
} | ||
} | ||
} | ||
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public static void main(String[] args) { | ||
fun(); | ||
} | ||
} |