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/*
* Copyright (c) 2020, 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.
*/
/*
* @test
* @bug 8240227
* @summary Test different cases of overunrolling the main loop of unswitched loops (pre/main/post) which are then not entered.
* @run main/othervm -XX:CompileCommand=compileonly,compiler.loopopts.TestUnswitchOverunrolling::test*
* -Xcomp -Xbatch -XX:-TieredCompilation compiler.loopopts.TestUnswitchOverunrolling
* @run main/othervm -XX:CompileCommand=compileonly,compiler.loopopts.TestUnswitchOverunrolling::*
* -Xcomp -Xbatch -XX:-TieredCompilation compiler.loopopts.TestUnswitchOverunrolling
*/
package compiler.loopopts;
public class TestUnswitchOverunrolling {
public static int v = 1;
public static int w = 2;
public static int x = 3;
public static int y = 4;
public static int z = 5;
// The inner for-loop is unswitched and pre-main-post loops are created for both unswitched loop versions.
// Afterwards, both main loops are over-unrolled and vectorized resulting in a crash in the matcher because
// the memory input to a vector is top.
public static int test(int[] array) {
int result = 0;
int[] iArr = new int[8];
for (int i = 0; i < array.length; i++) {
for (int j = 5; j < i; j++) {
if (x == 42) {
y = 34;
}
iArr[j] += array[j];
result += array[j];
}
}
return result;
}
// Test with additional null check predicates for objects
public static int test2(int[] array, A a, A a2) {
int result = 0;
int[] iArr = new int[8];
for (int i = 0; i < array.length; i++) {
for (int j = 5; j < i; j++) {
y = a2.iFld;
if (x == 42) {
y = 34;
}
z = a.iFld;
iArr[j] += array[j];
result += array[j];
}
}
return result;
}
// Test with two conditions (unswitch twice) and additional null check predicates for objects
public static int testUnswitchTwice(int[] array, A a, A a2, A a3) {
int result = 0;
int[] iArr = new int[8];
for (int i = 0; i < array.length; i++) {
for (int j = 5; j < i; j++) {
y = a2.iFld;
if (x == 42) {
y = 34;
}
z = a.iFld;
if (w == 22) {
y = 55;
}
v = a3.iFld;
iArr[j] += array[j];
result += array[j];
}
}
return result;
}
// Test with three conditions (unswitch three times) and additional null check predicates for objects
public static int testUnswitchThreeTimes(int[] array, A a, A a2, A a3) {
int result = 0;
int[] iArr = new int[8];
for (int i = 0; i < array.length; i++) {
for (int j = 5; j < i; j++) {
y += a2.iFld;
if (x == 42) {
y = 34;
}
if (w == 22) {
y = 55;
}
v = a3.iFld;
if (z == 75) {
y = 66;
}
y += a.iFld + a2.iFld + a3.iFld;
iArr[j] += array[j];
result += array[j];
}
}
return result;
}
public static void main(String args[]) {
int[] array = new int[8];
for (int i = 0; i < array.length; i++) {
array[i] = i + 1;
}
check(test(array), 1, 2, 3, 4, 5);
check(test2(array, new A(), new A()), 1, 2, 3, 6, 6);
check(testUnswitchTwice(array, new A(), new A(), new A()), 6, 2, 3, 6, 6);
check(testUnswitchThreeTimes(array, new A(), new A(), new A()), 6, 2, 3, 78, 6);
for (int i = 0; i < array.length; i++) {
if (array[i] != i + 1) {
throw new RuntimeException("array values should not change");
}
}
}
public static void check(int result, int expV, int expW, int expX, int expY, int expZ) {
if (result != 19 || expV != v || expW != w || expX != x || expY != y || expZ != z) {
throw new RuntimeException("wrong execution");
}
}
}
class A {
int iFld = 6;
}
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