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8262721: Add Tests to verify single iteration loops are properly opti…
…mized

Reviewed-by: neliasso, chagedorn, kvn
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rwestrel committed Feb 9, 2022
1 parent f092bab commit 69e390a0e86f82eaa7bcdbc3ef509734dbe3b22f
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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.
*
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*/

package compiler.c2.irTests;

import compiler.lib.ir_framework.*;

/*
* @test
* @bug 8262721
* @summary Add Tests to verify single iteration loops are properly optimized
* @library /test/lib /
* @run driver compiler.c2.irTests.TestFewIterationsCountedLoop
*/

public class TestFewIterationsCountedLoop {

public static void main(String[] args) {
TestFramework.runWithFlags("-XX:LoopUnrollLimit=0");
TestFramework.run();
}

static volatile int barrier;
static final Object object = new Object();

@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
}
}

@Test
@IR(failOn = { IRNode.COUNTEDLOOP, IRNode.LOOP })
public static void singleIterationWhile() {
int i = 0;
while (i < 1) {
barrier = 0x42;
i++;
}
}

@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);
}

@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
}
}

@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++;
}
}

@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);
}

@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
}
}

@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++;
}
}

@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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