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8296545: C2 Blackholes should allow load optimizations
Reviewed-by: mdoerr Backport-of: eab0ada3a16a432fdfd1f0b8fceca149c725451b
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111 changes: 111 additions & 0 deletions
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test/hotspot/jtreg/compiler/c2/irTests/blackhole/BlackholeLoadOptoTest.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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/* | ||
* @test | ||
* @bug 8296545 | ||
* @requires vm.compiler2.enabled | ||
* @summary Blackholes should allow load optimizations | ||
* @library /test/lib / | ||
* @run driver compiler.c2.irTests.blackhole.BlackholeLoadOptoTest | ||
*/ | ||
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package compiler.c2.irTests.blackhole; | ||
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import compiler.lib.ir_framework.*; | ||
import jdk.test.lib.Asserts; | ||
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public class BlackholeLoadOptoTest { | ||
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public static void main(String[] args) { | ||
TestFramework.runWithFlags( | ||
"-XX:+UnlockExperimentalVMOptions", | ||
"-XX:CompileThreshold=100", | ||
"-XX:-TieredCompilation", | ||
"-XX:CompileCommand=blackhole,compiler.c2.irTests.blackhole.BlackholeLoadOptoTest::blackhole", | ||
"-XX:CompileCommand=dontinline,compiler.c2.irTests.blackhole.BlackholeLoadOptoTest::dontinline" | ||
); | ||
} | ||
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static int x, y; | ||
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/* | ||
* Negative test: check that dangling expressions are eliminated | ||
*/ | ||
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@Test | ||
@IR(failOn = {IRNode.LOAD_I, IRNode.MUL_I}) | ||
static void testNothing() { | ||
int r1 = x * y; | ||
int r2 = x * y; | ||
} | ||
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@Run(test = "testNothing") | ||
static void runNothing() { | ||
testNothing(); | ||
} | ||
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/* | ||
* Auxiliary test: check that dontinline method does break optimizations | ||
*/ | ||
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@Test | ||
@IR(counts = {IRNode.LOAD_I, "4"}) | ||
@IR(counts = {IRNode.MUL_I, "2"}) | ||
static void testDontline() { | ||
int r1 = x * y; | ||
dontinline(r1); | ||
int r2 = x * y; | ||
dontinline(r2); | ||
} | ||
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static void dontinline(int x) {} | ||
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@Run(test = "testDontline") | ||
static void runDontinline() { | ||
testDontline(); | ||
} | ||
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/* | ||
* Positive test: check that blackhole does not break optimizations | ||
*/ | ||
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@Test | ||
@IR(counts = {IRNode.LOAD_I, "2"}) | ||
@IR(counts = {IRNode.MUL_I, "1"}) | ||
static void testBlackholed() { | ||
int r1 = x * y; | ||
blackhole(r1); | ||
int r2 = x * y; | ||
blackhole(r2); | ||
} | ||
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static void blackhole(int x) {} | ||
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@Run(test = "testBlackholed") | ||
static void runBlackholed() { | ||
testBlackholed(); | ||
} | ||
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} |
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