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