92 lines
3.2 KiB
Java
92 lines
3.2 KiB
Java
/*
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* Copyright (c) 2024, 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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package compiler.loopopts.superword;
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/*
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* @test id=Vanilla
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* @bug 8327172
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* @summary Test bad loop ctrl: a node is in the loop, but has no input in the loop
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* @run main/othervm compiler.loopopts.superword.TestNoInputInLoop
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*/
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/*
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* @test id=WithFlags
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* @bug 8327172
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* @summary Test bad loop ctrl: a node is in the loop, but has no input in the loop
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* @run main/othervm -Xbatch -XX:PerMethodTrapLimit=0
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* compiler.loopopts.superword.TestNoInputInLoop
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*/
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/*
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* @test id=WithMoreFlags
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* @bug 8327172
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* @summary Test bad loop ctrl: a node is in the loop, but has no input in the loop
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* @run main/othervm -Xbatch -XX:PerMethodTrapLimit=0
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* -XX:CompileCommand=compileonly,compiler.loopopts.superword.TestNoInputInLoop::test*
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* compiler.loopopts.superword.TestNoInputInLoop
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*/
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public class TestNoInputInLoop {
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static long lFld;
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static float fFld;
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static int iArr[] = new int[400];
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public static void main(String[] strArr) {
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for (int i = 0; i < 100; i++) {
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test1();
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}
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for (int i = 0; i < 1_000; i++) {
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test2(0);
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}
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}
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// It specifically reproduced with UseAVX=2
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// 1. PhaseIdealLoop::build_loop_early
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// We have a Store in a loop, with a Load after it.
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// Both have ctrl as the CountedLoopNode.
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// 2. split_if_with_blocks -> PhaseIdealLoop::try_move_store_before_loop
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// The Store is moved out of the loop, and its ctrl updated accordingly.
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// But the Load has its ctrl not updated, even though it has now no input in the loop.
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// 3. SuperWord (VLoopBody::construct)
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// We detect a data node in the loop that has no input in the loop.
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// This is not expected.
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// OSR failure
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static void test1() {
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for (int i = 0; i < 200; i++) {
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fFld *= iArr[0] - lFld;
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iArr[1] = (int) lFld;
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for (int j = 0; j < 100_000; j++) {} // empty loop, trigger OSR
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}
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}
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// Normal compilation
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static void test2(int start) {
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for (int i = start; i < 200; i++) {
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fFld *= iArr[0] - lFld;
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iArr[1] = (int) lFld;
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}
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}
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}
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