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8262721: Add Tests to verify single iteration loops are properly opti…
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test/hotspot/jtreg/compiler/c2/irTests/TestFewIterationsCountedLoop.java
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/* | ||
* Copyright (c) 2022, 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. | ||
*/ | ||
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package compiler.c2.irTests; | ||
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import compiler.lib.ir_framework.*; | ||
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/* | ||
* @test | ||
* @bug 8262721 | ||
* @summary Add Tests to verify single iteration loops are properly optimized | ||
* @library /test/lib / | ||
* @run driver compiler.c2.irTests.TestFewIterationsCountedLoop | ||
*/ | ||
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public class TestFewIterationsCountedLoop { | ||
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public static void main(String[] args) { | ||
TestFramework.runWithFlags("-XX:LoopUnrollLimit=0"); | ||
TestFramework.run(); | ||
} | ||
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static volatile int barrier; | ||
static final Object object = new Object(); | ||
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@Test | ||
@IR(failOn = { IRNode.COUNTEDLOOP, IRNode.LOOP }) | ||
public static void singleIterationFor() { | ||
for (int i = 0; i < 1; i++) { | ||
barrier = 0x42; // something that can't be optimized out | ||
} | ||
} | ||
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@Test | ||
@IR(failOn = { IRNode.COUNTEDLOOP, IRNode.LOOP }) | ||
public static void singleIterationWhile() { | ||
int i = 0; | ||
while (i < 1) { | ||
barrier = 0x42; | ||
i++; | ||
} | ||
} | ||
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@Test | ||
@IR(failOn = { IRNode.COUNTEDLOOP, IRNode.LOOP }) | ||
@Warmup(1) // So C2 can't rely on profile data | ||
public static void singleIterationDoWhile() { | ||
int i = 0; | ||
do { | ||
synchronized(object) {} // so loop head is not cloned by ciTypeFlow | ||
barrier = 0x42; | ||
i++; | ||
} while (i < 1); | ||
} | ||
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@Test | ||
@IR(applyIf = { "LoopUnrollLimit", "0" }, counts = { IRNode.COUNTEDLOOP, "1" }) | ||
@IR(applyIf = { "LoopUnrollLimit", "> 0" }, failOn = { IRNode.COUNTEDLOOP, IRNode.LOOP }) | ||
public static void twoIterationsFor() { | ||
for (int i = 0; i < 2; i++) { | ||
barrier = 0x42; // something that can't be optimized out | ||
} | ||
} | ||
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@Test | ||
@IR(applyIf = { "LoopUnrollLimit", "0" }, counts = { IRNode.COUNTEDLOOP, "1" }) | ||
@IR(applyIf = { "LoopUnrollLimit", "> 0" }, failOn = { IRNode.COUNTEDLOOP, IRNode.LOOP }) | ||
public static void twoIterationsWhile() { | ||
int i = 0; | ||
while (i < 2) { | ||
barrier = 0x42; | ||
i++; | ||
} | ||
} | ||
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@Test | ||
@IR(applyIf = { "LoopUnrollLimit", "0" }, counts = { IRNode.COUNTEDLOOP, "1" }) | ||
@IR(applyIf = { "LoopUnrollLimit", "> 0" }, failOn = { IRNode.COUNTEDLOOP, IRNode.LOOP }) | ||
public static void twoIterationsDoWhile() { | ||
int i = 0; | ||
do { | ||
synchronized(object) {} // so loop head is not cloned by ciTypeFlow | ||
barrier = 0x42; | ||
i++; | ||
} while (i < 2); | ||
} | ||
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@Test | ||
@IR(applyIf = { "LoopUnrollLimit", "0" }, counts = { IRNode.COUNTEDLOOP, "1" }) | ||
@IR(applyIf = { "LoopUnrollLimit", "> 0" }, failOn = { IRNode.COUNTEDLOOP, IRNode.LOOP }) | ||
public static void threadIterationsFor() { | ||
for (int i = 0; i < 2; i++) { | ||
barrier = 0x42; // something that can't be optimized out | ||
} | ||
} | ||
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@Test | ||
@IR(applyIf = { "LoopUnrollLimit", "0" }, counts = { IRNode.COUNTEDLOOP, "1" }) | ||
@IR(applyIf = { "LoopUnrollLimit", "> 0" }, failOn = { IRNode.COUNTEDLOOP, IRNode.LOOP }) | ||
public static void threeIterationsWhile() { | ||
int i = 0; | ||
while (i < 2) { | ||
barrier = 0x42; | ||
i++; | ||
} | ||
} | ||
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@Test | ||
@IR(applyIf = { "LoopUnrollLimit", "0" }, counts = { IRNode.COUNTEDLOOP, "1" }) | ||
@IR(applyIf = { "LoopUnrollLimit", "> 0" }, failOn = { IRNode.COUNTEDLOOP, IRNode.LOOP }) | ||
public static void threeIterationsDoWhile() { | ||
int i = 0; | ||
do { | ||
synchronized(object) {} // so loop head is not cloned by ciTypeFlow | ||
barrier = 0x42; | ||
i++; | ||
} while (i < 2); | ||
} | ||
} |
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