135 lines
4.1 KiB
Java
135 lines
4.1 KiB
Java
/*
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* Copyright (c) 2025, Red Hat, Inc. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/**
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* @test
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* @bug 8356708
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* @summary C2: loop strip mining expansion doesn't take sunk stores into account
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*
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* @run main/othervm -XX:-TieredCompilation -XX:-UseOnStackReplacement -XX:-BackgroundCompilation -XX:LoopMaxUnroll=0
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* -XX:+UnlockDiagnosticVMOptions -XX:+StressGCM -XX:StressSeed=26601954 TestStoresSunkInOuterStripMinedLoop
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* @run main/othervm -XX:-TieredCompilation -XX:-UseOnStackReplacement -XX:-BackgroundCompilation -XX:LoopMaxUnroll=0
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* -XX:+UnlockDiagnosticVMOptions -XX:+StressGCM TestStoresSunkInOuterStripMinedLoop
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* @run main TestStoresSunkInOuterStripMinedLoop
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*
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*/
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public class TestStoresSunkInOuterStripMinedLoop {
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private static int field;
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private static volatile int volatileField;
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public static void main(String[] args) {
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A a1 = new A();
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A a2 = new A();
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A a3 = new A();
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for (int i = 0; i < 20_000; i++) {
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field = 0;
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test1();
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if (field != 1500) {
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throw new RuntimeException(field + " != 1500");
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}
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a1.field = 0;
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test2(a1, a2);
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if (a1.field != 1500) {
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throw new RuntimeException(a1.field + " != 1500");
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}
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a1.field = 0;
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test3(a1, a2);
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if (a1.field != 1500) {
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throw new RuntimeException(a1.field + " != 1500");
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}
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a1.field = 0;
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test4(a1, a2, a3);
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if (a1.field != 1500) {
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throw new RuntimeException(a1.field + " != 1500");
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}
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}
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}
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// Single store sunk in outer loop, no store in inner loop
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private static float test1() {
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int v = field;
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float f = 1;
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for (int i = 0; i < 1500; i++) {
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f *= 2;
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v++;
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field = v;
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}
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return f;
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}
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// Couple stores sunk in outer loop, no store in inner loop
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private static float test2(A a1, A a2) {
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field = a1.field + a2.field;
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volatileField = 42;
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int v = a1.field;
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float f = 1;
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for (int i = 0; i < 1500; i++) {
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f *= 2;
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v++;
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a1.field = v;
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a2.field = v;
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}
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return f;
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}
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// Store sunk in outer loop, store in inner loop
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private static float test3(A a1, A a2) {
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field = a1.field + a2.field;
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volatileField = 42;
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int v = a1.field;
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float f = 1;
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A a = a2;
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for (int i = 0; i < 1500; i++) {
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f *= 2;
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v++;
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a.field = v;
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a = a1;
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a2.field = v;
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}
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return f;
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}
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// Couples stores sunk in outer loop, store in inner loop
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private static float test4(A a1, A a2, A a3) {
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field = a1.field + a2.field + a3.field;
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volatileField = 42;
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int v = a1.field;
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float f = 1;
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A a = a2;
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for (int i = 0; i < 1500; i++) {
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f *= 2;
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v++;
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a.field = v;
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a = a1;
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a2.field = v;
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a3.field = v;
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}
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return f;
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}
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static class A {
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int field;
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}
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}
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