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/*
* Copyright (c) 2021, 2024, 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 8240281
* @summary Test which needs to select the memory state of the first load in a load pack in SuperWord::co_locate_pack.
*
* @run main/othervm -Xcomp -XX:CompileCommand=compileonly,compiler.loopopts.superword.TestPickFirstMemoryState::*
* compiler.loopopts.superword.TestPickFirstMemoryState
* @run main/othervm -XX:CompileCommand=dontinline,compiler.loopopts.superword.TestPickFirstMemoryState::*
* compiler.loopopts.superword.TestPickFirstMemoryState
*/
package compiler.loopopts.superword;
public class TestPickFirstMemoryState {
static int iArrFld[] = new int[50];
static int test() {
int x = 2;
for (int i = 50; i > 9; i--) {
// We create an AddI pack and a LoadI pack for the following loop. The StoreI pack gets filtered. When
// finding the memory state for the load pack, we cannot pick the memory state from the last load as
// the stores (which are not vectorized) could interfere and be executed before the load pack (already
// writing 'j' to iArrFld which is afterwards loaded by the load vector operation). This leads to a
// wrong result for 'x'. We must take the memory state of the first load where we have not yet assigned
// any new values ('j') to the iArrFld array.
x = 2;
for (int j = 10; j < 50; j++) {
x += iArrFld[j]; // AddI pack + LoadI pack
iArrFld[j] = j; // StoreI pack that gets removed while filtering packs
}
reset();
}
return x;
}
static int test2() {
int x = 2;
int y = 3;
for (int i = 50; i > 9; i--) {
x = 2;
for (int j = 10; j < 50; j++) {
x += iArrFld[j];
iArrFld[j] = (y++);
}
reset();
}
return x;
}
static int test3() {
int x = 2;
for (int i = 50; i > 9; i--) {
x = 2;
int y = i;
for (int j = 10; j < 50; j++) {
y++;
x += iArrFld[j];
iArrFld[j] = y;
}
reset();
}
return x;
}
static int test4() {
int x = 2;
long y = 3L;
for (int i = 50; i > 9; i--) {
x = 2;
for (int j = 10; j < 50; j++) {
x += iArrFld[j];
iArrFld[j] = (int)(y++);
}
reset();
}
return x;
}
public static void main(String[] strArr) {
for (int i = 0; i < 5000; i++) {
reset();
int x = test();
if (x != 202) {
throw new RuntimeException("test() wrong result: " + x);
}
x = test2();
if (x != 202) {
throw new RuntimeException("test2() wrong result: " + x);
}
x = test3();
if (x != 202) {
throw new RuntimeException("test3() wrong result: " + x);
}
x = test4();
if (x != 202) {
throw new RuntimeException("test4() wrong result: " + x);
}
}
}
public static void reset() {
for (int i = 0; i < iArrFld.length; i++) {
iArrFld[i] = 5;
}
}
}
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