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78 lines
2.7 KiB
Java
78 lines
2.7 KiB
Java
/*
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* Copyright (c) 2026, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package compiler.integerArithmetic;
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import compiler.lib.ir_framework.*;
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import jdk.test.lib.Asserts;
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/*
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* @test
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* @bug 8347365
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* @summary Tests that divisions are hoisted when their zero checks are elided.
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* @library /test/lib /
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* @run driver ${test.main.class}
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*/
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public class TestHoistDivision {
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public static void main(String[] args) {
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TestFramework.run();
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}
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@DontInline
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private static void dontInline() {}
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@Run(test = {"testCommon", "testHoistOutOfLoop"})
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public void run() {
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Asserts.assertEQ(2, testCommon(1, 1));
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Asserts.assertEQ(0, testHoistOutOfLoop(1, 1, true, 1, 4, 2));
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Asserts.assertEQ(0, testHoistOutOfLoop(1, 1, false, 1, 4, 2));
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}
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@Test
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@IR(counts = {IRNode.DIV_I, "1", IRNode.DIV_BY_ZERO_TRAP, "1"})
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public int testCommon(int x, int y) {
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// The 2 divisions should be commoned
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int result = x / y;
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dontInline();
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return result + x / y;
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}
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@Test
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@IR(failOn = IRNode.DIV_BY_ZERO_TRAP, counts = {IRNode.DIV_I, "1", IRNode.TRAP, "1"})
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public int testHoistOutOfLoop(int x, int y, boolean b, int start, int limit, int step) {
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// The divisions should be hoisted out of the loop, allowing them to be commoned
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int result = 0;
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for (int i = start; i < limit; i *= step) {
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if (b) {
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dontInline();
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result += x / y;
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} else {
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result -= x / y;
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}
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b = !b;
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}
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return result;
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}
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}
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