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/*
* Copyright (c) 2025, 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.loopopts;
import compiler.lib.ir_framework.*;
import java.util.Random;
import jdk.test.lib.Utils;
import jdk.test.lib.Asserts;
/*
* @test
* @bug 8346552
* @summary Test that all parse predicates are cloned after loop unswitching.
* @key randomness
* @library /test/lib /
* @run driver compiler.loopopts.TestUnswitchPredicateCloning
*/
public class TestUnswitchPredicateCloning {
static final int SIZE = 100;
private static final Random random = Utils.getRandomInstance();
public static void main(String[] strArr) {
TestFramework.run();
}
@Run(test = {"testUnswitchingBeforePredication", "testPredicationBeforeUnswitching", "testUnswitchingUncounted"})
@Warmup(0)
private static void runNoWarmup() {
final int idx = random.nextInt(SIZE);
final boolean cond = random.nextBoolean();
int res = testUnswitchingBeforePredication(idx);
Asserts.assertEQ(SIZE * idx, res);
res = testPredicationBeforeUnswitching(idx, cond);
Asserts.assertEQ((SIZE * (SIZE - 1)) / 2 + (cond ? SIZE * idx : 0), res);
res = testUnswitchingUncounted(cond);
Asserts.assertEQ((SIZE * (SIZE - 1)) / 2 + (cond ? SIZE : 0), res);
}
@DontInline
private static int[] getArr() {
int[] arr = new int[SIZE];
for (int i = 0; i < SIZE; i++) {
arr[i] = i;
}
return arr;
}
@Test
// Check that Loop Unswitching doubled the number of Parse Predicates: We have
// them at the true- and false-path-loop. Note that the Loop Limit Check Parse
// Predicate is not cloned when we already have a counted loop.
@IR(counts = { IRNode.LOOP_PARSE_PREDICATE, "3",
IRNode.PROFILED_LOOP_PARSE_PREDICATE, "3",
IRNode.LOOP_LIMIT_CHECK_PARSE_PREDICATE, "3",
IRNode.AUTO_VECTORIZATION_CHECK_PARSE_PREDICATE, "3" },
phase = CompilePhase.BEFORE_LOOP_UNSWITCHING)
// Since we know that Loop Predication happens after Loop Unswitching, we can test the
// have already been removed in the beautify loop phase.
@IR(counts = { IRNode.LOOP_PARSE_PREDICATE, "4",
IRNode.PROFILED_LOOP_PARSE_PREDICATE, "4",
IRNode.LOOP_LIMIT_CHECK_PARSE_PREDICATE, "3",
IRNode.AUTO_VECTORIZATION_CHECK_PARSE_PREDICATE, "4" },
phase = CompilePhase.BEFORE_LOOP_PREDICATION_RC)
// Check that Opaque Template Assertion Predicates are added in Loop Predication
// even if Loop Predication only happens after Loop Unswitching.
@IR(failOn = { IRNode.OPAQUE_TEMPLATE_ASSERTION_PREDICATE },
phase = CompilePhase.AFTER_LOOP_UNSWITCHING)
@IR(counts = { IRNode.OPAQUE_TEMPLATE_ASSERTION_PREDICATE, "2" },
phase = CompilePhase.AFTER_LOOP_PREDICATION_RC)
static int testUnswitchingBeforePredication(int j) {
int zero = 34;
int limit = 2;
// Ensure zero == 0 is only known after CCP
for (; limit < 4; limit *= 2) {
}
for (int i = 2; i < limit; i++) {
zero = 0;
}
int[] arr = getArr();
int res = 0;
for (int i = 0; i < arr.length; i++) {
// Trigger unswitching only after CCP
if (zero == 0) {
// Trigger range check after loop unswitching
res += arr[j];
} else {
res += arr[i];
}
}
return res;
}
@Test
// Check that Loop Unswitching doubled the number of Parse and Template
// Assertion Predicates. Again, the Loop Limit Check Parse Predicate
// remains at the Loop Selector since this is a counted loop.
@IR(failOn = { IRNode.OPAQUE_TEMPLATE_ASSERTION_PREDICATE },
phase = CompilePhase.BEFORE_LOOP_PREDICATION_RC)
@IR(counts = { IRNode.OPAQUE_TEMPLATE_ASSERTION_PREDICATE, "2",
IRNode.LOOP_PARSE_PREDICATE, "1",
IRNode.PROFILED_LOOP_PARSE_PREDICATE, "1",
IRNode.LOOP_LIMIT_CHECK_PARSE_PREDICATE, "1",
IRNode.AUTO_VECTORIZATION_CHECK_PARSE_PREDICATE, "1" },
phase = CompilePhase.BEFORE_LOOP_UNSWITCHING)
// After Loop Unswitching and after removing the killed predicates.
@IR(counts = { IRNode.OPAQUE_TEMPLATE_ASSERTION_PREDICATE, "4",
IRNode.LOOP_PARSE_PREDICATE, "2",
IRNode.PROFILED_LOOP_PARSE_PREDICATE, "2",
IRNode.LOOP_LIMIT_CHECK_PARSE_PREDICATE, "1",
IRNode.AUTO_VECTORIZATION_CHECK_PARSE_PREDICATE, "2" },
phase = CompilePhase.PHASEIDEALLOOP2)
static int testPredicationBeforeUnswitching(int j, boolean cond) {
int[] arr = getArr();
int res = 0;
for (int i = 0; i < arr.length; i++) {
if (cond) {
res += arr[j];
}
res += arr[i];
}
return res;
}
@Test
// Check that Loop Unswitching doubled the number of all Parse Predicates.
// Since this is not counted loop, the Loop Limit Check Parse Predicate
// has to be cloned to both unswitched loops.
@IR(counts = { IRNode.LOOP_PARSE_PREDICATE, "1",
IRNode.PROFILED_LOOP_PARSE_PREDICATE, "1",
IRNode.LOOP_LIMIT_CHECK_PARSE_PREDICATE, "1",
IRNode.AUTO_VECTORIZATION_CHECK_PARSE_PREDICATE, "1" },
phase = CompilePhase.BEFORE_LOOP_UNSWITCHING)
// After Loop Unswitching and after removing the killed predicates all
// Parse Predicates are doubled.
@IR(counts = { IRNode.LOOP_PARSE_PREDICATE, "2",
IRNode.PROFILED_LOOP_PARSE_PREDICATE, "2",
IRNode.LOOP_LIMIT_CHECK_PARSE_PREDICATE, "2",
IRNode.AUTO_VECTORIZATION_CHECK_PARSE_PREDICATE, "2" },
failOn = { IRNode.COUNTED_LOOP },
phase = CompilePhase.PHASEIDEALLOOP1)
@IR(failOn = { IRNode.COUNTED_LOOP })
static int testUnswitchingUncounted(boolean cond) {
int[] arr = getArr();
int res = 0;
int i = 0;
while (i < arr.length) {
if (cond) {
res += 1;
}
res += arr[i];
i = arr[i] + 1; // effectively i += 1, but don't tell the compiler!
}
return res;
}
}
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