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/*
* Copyright (c) 2025, 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.
*/
/**
* @test
* @bug 8356708
* @summary C2: loop strip mining expansion doesn't take sunk stores into account
*
* @run main/othervm -XX:-TieredCompilation -XX:-UseOnStackReplacement -XX:-BackgroundCompilation -XX:LoopMaxUnroll=0
* -XX:+UnlockDiagnosticVMOptions -XX:+StressGCM -XX:StressSeed=26601954 TestStoresSunkInOuterStripMinedLoop
* @run main/othervm -XX:-TieredCompilation -XX:-UseOnStackReplacement -XX:-BackgroundCompilation -XX:LoopMaxUnroll=0
* -XX:+UnlockDiagnosticVMOptions -XX:+StressGCM TestStoresSunkInOuterStripMinedLoop
* @run main TestStoresSunkInOuterStripMinedLoop
*
*/
public class TestStoresSunkInOuterStripMinedLoop {
private static int field;
private static volatile int volatileField;
public static void main(String[] args) {
A a1 = new A();
A a2 = new A();
A a3 = new A();
for (int i = 0; i < 20_000; i++) {
field = 0;
test1();
if (field != 1500) {
throw new RuntimeException(field + " != 1500");
}
a1.field = 0;
test2(a1, a2);
if (a1.field != 1500) {
throw new RuntimeException(a1.field + " != 1500");
}
a1.field = 0;
test3(a1, a2);
if (a1.field != 1500) {
throw new RuntimeException(a1.field + " != 1500");
}
a1.field = 0;
test4(a1, a2, a3);
if (a1.field != 1500) {
throw new RuntimeException(a1.field + " != 1500");
}
}
}
// Single store sunk in outer loop, no store in inner loop
private static float test1() {
int v = field;
float f = 1;
for (int i = 0; i < 1500; i++) {
f *= 2;
v++;
field = v;
}
return f;
}
// Multiple stores sunk in outer loop, no store in inner loop
private static float test2(A a1, A a2) {
field = a1.field + a2.field;
volatileField = 42;
int v = a1.field;
float f = 1;
for (int i = 0; i < 1500; i++) {
f *= 2;
v++;
a1.field = v;
a2.field = v;
}
return f;
}
// Store sunk in outer loop, store in inner loop
private static float test3(A a1, A a2) {
field = a1.field + a2.field;
volatileField = 42;
int v = a1.field;
float f = 1;
A a = a2;
for (int i = 0; i < 1500; i++) {
f *= 2;
v++;
a.field = v;
a = a1;
a2.field = v;
}
return f;
}
// Multiple stores sunk in outer loop, store in inner loop
private static float test4(A a1, A a2, A a3) {
field = a1.field + a2.field + a3.field;
volatileField = 42;
int v = a1.field;
float f = 1;
A a = a2;
for (int i = 0; i < 1500; i++) {
f *= 2;
v++;
a.field = v;
a = a1;
a2.field = v;
a3.field = v;
}
return f;
}
static class A {
int field;
}
}
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