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