| /* |
| * Copyright (c) 2024, Oracle and/or its affiliates. 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 8331717 |
| * @summary C2: Crash with SIGFPE |
| * |
| * @run main/othervm -XX:CompileCommand=compileonly,*TestLoopPredicationDivZeroCheck*::* -XX:-TieredCompilation -Xbatch TestLoopPredicationDivZeroCheck |
| */ |
| |
| public class TestLoopPredicationDivZeroCheck { |
| static int iArr[] = new int[100]; |
| static volatile long lFld; |
| static int iFld; |
| |
| public static void main(String[] strArr) { |
| for (int i = 0; i < 10000; i++) { |
| test(); |
| } |
| for (int i = 0; i < 10000; i++) { |
| test2(); |
| } |
| } |
| |
| /* |
| * The division 2 / i4 requires a non-zero check. As the result is an array access, it will be the input to a range |
| * check. Loop predication will try to move the range check and the division to right before the loop as the division |
| * appears to be invariant (i4 is always 0). However, the division is not truly invariant as it requires the zero |
| * check for i4 that can throw an exception. The bug fixed in 8331717 caused the division to still be moved before the |
| * for loop with the range check. |
| */ |
| static void test() { |
| int i1 = 0; |
| |
| for (int i4 : iArr) { |
| i4 = i1; |
| try { |
| iArr[0] = 1 / i4; |
| i4 = iArr[2 / i4]; |
| } catch (ArithmeticException a_e) { |
| } |
| } |
| } |
| |
| /* |
| * Loop predication will try to move 3 / y (input to the range check for bArr[x / 30]) before its containing for loop |
| * but it may not as y must be zero-checked. The same problem as above occurred before the fix in 8331717. |
| */ |
| static void test2() { |
| int x = 0; |
| int y = iFld; |
| long lArr[] = new long[400]; |
| boolean bArr[] = new boolean[400]; |
| for (int i = 0; i < 10000; i++) { |
| for (int j = 1; j < 13; j++) { |
| for (int k = 1; k < 2; k++) { |
| lFld = 0; |
| lArr[1] = 7; |
| try { |
| x = 3 / y; |
| } catch (ArithmeticException a_e) { |
| } |
| bArr[x / 30] = true; |
| } |
| } |
| } |
| } |
| } |
