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8314997: Missing optimizations due to missing try_clean_mem_phi() calls
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126 changes: 126 additions & 0 deletions
126
test/hotspot/jtreg/compiler/c2/irTests/igvn/TestCleanMemPhi.java
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| /* | ||
| * Copyright (c) 2023, 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. | ||
| */ | ||
| package compiler.c2.irTests.igvn; | ||
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| import compiler.lib.ir_framework.*; | ||
| import jdk.test.lib.Asserts; | ||
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| /* | ||
| * @test | ||
| * @bug 8314997 | ||
| * @requires vm.debug == true & vm.compiler2.enabled | ||
| * @summary Test that diamond if-region is removed due to calling try_clean_mem_phi(). | ||
| * @library /test/lib / | ||
| * @run driver compiler.c2.irTests.igvn.TestCleanMemPhi | ||
| */ | ||
| public class TestCleanMemPhi { | ||
| static boolean flag, flag2; | ||
| static int iFld; | ||
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| public static void main(String[] args) { | ||
| TestFramework testFramework = new TestFramework(); | ||
| testFramework.setDefaultWarmup(0); | ||
| testFramework.addFlags("-XX:+AlwaysIncrementalInline", "-XX:-PartialPeelLoop", "-XX:-LoopUnswitching"); | ||
| testFramework.addScenarios(new Scenario(1, "-XX:-StressIGVN"), | ||
| new Scenario(2, "-XX:+StressIGVN")); | ||
| testFramework.start(); | ||
| } | ||
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| static class A { | ||
| int i; | ||
| } | ||
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| static A a1 = new A(); | ||
| static A a2 = new A(); | ||
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| @Test | ||
| @IR(counts = {IRNode.COUNTED_LOOP, "> 0"}) | ||
| static void testCountedLoop() { | ||
| int zero = 34; | ||
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| int limit = 2; | ||
| for (; limit < 4; limit *= 2) ; | ||
| for (int i = 2; i < limit; i++) { | ||
| zero = 0; | ||
| } | ||
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| // Loop is not converted to a counted loop because a diamond is not removed due to missing to call | ||
| // try_clean_mem_phi() again on the diamond region. | ||
| int i = 0; | ||
| do { | ||
| iFld = 34; | ||
| if (flag2) { | ||
| iFld++; | ||
| } | ||
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| int z = 34; | ||
| if (flag) { | ||
| lateInline(); // Inlined late -> leaves a MergeMem | ||
| if (zero == 34) { // False but only cleaned up after CCP | ||
| iFld = 38; | ||
| } | ||
| z = 32; // Ensures to get a diamond If-Region | ||
| } | ||
| // Region merging a proper diamond after CCP with a memory phi merging loop phi and the MergeMem from lateInline(). | ||
| // Region is not added to the IGVN worklist anymore once the second phi dies. | ||
| i++; | ||
| } while (zero == 34 || (i < 1000 && a1 == a2)); // Could be converted to a counted loop after the diamond is removed after CCP. | ||
| } | ||
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| @Test | ||
| @IR(failOn = IRNode.LOOP) | ||
| static void testRemoveLoop() { | ||
| int zero = 34; | ||
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| int limit = 2; | ||
| for (; limit < 4; limit *= 2) ; | ||
| for (int i = 2; i < limit; i++) { | ||
| zero = 0; | ||
| } | ||
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| // Loop is not converted to a counted loop and thus cannot be removed as empty loop because a diamond is not | ||
| // removed due to missing to call try_clean_mem_phi() again on the diamond region. | ||
| int i = 0; | ||
| do { | ||
| iFld = 34; | ||
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| int z = 34; | ||
| if (flag) { | ||
| lateInline(); // Inlined late -> leaves a MergeMem | ||
| if (zero == 34) { // False but only cleaned up after CCP | ||
| iFld = 38; | ||
| } | ||
| z = 32; // Ensures to get a diamond If-Region | ||
| } | ||
| // Region merging a proper diamond after CCP with a memory phi merging loop phi and the MergeMem from lateInline(). | ||
| // Region is not added to the IGVN worklist anymore once the second phi dies. | ||
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| i++; | ||
| } while (zero == 34 || (i < 21 && a1 == a2)); | ||
| } | ||
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| static void lateInline() { | ||
| } | ||
| } |