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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.codegen;
/**
* @test
* @bug 8333393
* @summary Test that loads are not scheduled too late.
* @run main/othervm -XX:CompileCommand=compileonly,*Test*::test
* -XX:-TieredCompilation -Xbatch
* -XX:PerMethodTrapLimit=0
* -XX:CompileCommand=dontinline,*::dontInline
* compiler.codegen.TestGCMLoadPlacement
* @run main/othervm -XX:CompileCommand=compileonly,*Test*::test
* -XX:-TieredCompilation -Xbatch
* -XX:PerMethodTrapLimit=0
* -XX:CompileCommand=dontinline,*::dontInline
* -XX:+UnlockDiagnosticVMOptions
* -XX:+StressGCM -XX:+StressLCM
* compiler.codegen.TestGCMLoadPlacement
* @run main/othervm -XX:LoopMaxUnroll=0
* -XX:CompileCommand=compileonly,*Test*::test
* -XX:-TieredCompilation -Xbatch
* -XX:PerMethodTrapLimit=0
* compiler.codegen.TestGCMLoadPlacement
* @run main/othervm -XX:LoopMaxUnroll=0
* -XX:CompileCommand=compileonly,*Test*::test
* -XX:-TieredCompilation -Xbatch
* -XX:PerMethodTrapLimit=0
* -XX:+UnlockDiagnosticVMOptions
* -XX:+StressGCM -XX:+StressLCM
* compiler.codegen.TestGCMLoadPlacement
* @run main compiler.codegen.TestGCMLoadPlacement
*/
public class TestGCMLoadPlacement {
public static void main(String[] args) {
int c = 0;
try {
Test1.run();
} catch (Exception e) {
c++; System.out.println("Test1 failure");
}
try {
Test2.run();
} catch (Exception e) {
c++; System.out.println("Test2 failure");
}
try {
Test3.run();
} catch (Exception e) {
c++; System.out.println("Test3 failure");
}
try {
Test4.run();
} catch (Exception e) {
c++; System.out.println("Test4 failure");
}
try {
Test5.run();
} catch (Exception e) {
c++; System.out.println("Test5 failure");
}
if (c > 0) {
throw new RuntimeException("Test failures: " + c);
}
}
static class Test1 {
static boolean flag;
volatile byte volFld;
int iFld;
int test() {
for (int i = 0; i < 50; ++i) {
for (int j = 0; j < 50; ++j) {
if (flag) { return 0; } // Forces peeling
iFld = 0;
for (int k = 0; k < 1; ++k) {
}
}
}
int res = iFld; // This load needs to schedule before the loop below ...
for (int i = 0; i < 50; ++i) {
volFld = 0;
iFld -= 42;
}
// ... and was incorrectly scheduled here.
return res;
}
static void run() {
Test1 t = new Test1();
for (int i = 0; i < 10; i++) {
int res = t.test();
if (res != 0) {
throw new RuntimeException("Unexpected result: " + res);
}
}
}
}
static class Test2 {
static void run() {
for (int i = 0; i < 500; i++) {
int res = test();
if (res != 0) {
throw new RuntimeException("res = " + res);
}
}
}
static int test() {
int res = 0;
int array[] = new int[50];
for (int j = 0; j < array.length; j++) {
array[j] = 0;
}
int x = array[0];
for (int i = 5; i < 10; i++) {
array[0] = 42;
for (int j = 0; j < 10; j++) {
dontInline();
res = x;
}
}
return res;
}
static void dontInline() {}
}
static class Test3 {
static boolean flag;
static int N = 400;
long instanceCount;
float fFld = 2.957F;
volatile short sFld;
int iArrFld[] = new int[N];
int test() {
int i22 = 7, i25, i27, i28 = 5, i29, i31, i33;
for (i25 = 229; i25 > 2; --i25) {
if (flag) { return 9; }
iArrFld[1] *= instanceCount;
for (i27 = 4; i27 < 116; ++i27) {
}
}
i22 += fFld;
for (i29 = 23; 8 < i29; i29--) {
for (i31 = 2; i31 < 17; i31++) {
if (flag) { return 9; }
i28 = sFld;
}
for (i33 = 1; 7 > i33; ++i33) {
if (flag) { return 9; }
fFld = instanceCount;
}
}
return i22;
}
static void run() {
Test3 r = new Test3();
int result = r.test();
if (result != 9) {
throw new RuntimeException("Expected 9 but found " + result);
}
}
}
static class Test4 {
static boolean flag;
volatile byte volFld;
int iFld;
int test() {
for (int j = 0; j < 50; ++j) {
iFld = 0;
if (flag) { return 0; }
for (int k = 0; k < 2000; ++k) {
}
}
int res = iFld;
for (int i = 0; i < 50; ++i) {
volFld = 0;
iFld -= 1;
}
return res;
}
static void run() {
Test4 t = new Test4();
for (int i = 0; i < 10; i++) {
int res = t.test();
if (res != 0) {
throw new RuntimeException("Unexpected result: " + res);
}
}
}
}
static class Test5 {
static boolean flag;
volatile byte volFld;
int iFld, iFld2;
int test() {
for (int j = 0; j < 50; ++j) {
iFld2 = 0;
if (flag) { return 0; }
for (int k = 0; k < 2000; ++k) {
}
}
int res = iFld;
for (int i = 0; i < 50; ++i) {
volFld = 0;
iFld -= 1;
}
return res;
}
static void run() {
Test5 t = new Test5();
for (int i = 0; i < 10; i++) {
t.iFld = 0;
int res = t.test();
if (res != 0) {
throw new RuntimeException("Unexpected result: " + res);
}
}
}
}
}
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