russell@unturf.com
0a580b313d
Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com Patches, unit tests, benchmarks, whitepaper, and outreach briefs. Public domain — no copyright claimed. Use freely.
72 lines
2.5 KiB
Java
72 lines
2.5 KiB
Java
/*
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* Copyright (c) 2025, 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 8320909
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* @summary AndNode has a special handling when one of the operands is a LShiftNode:
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* (LHS << s) & RHS
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* if RHS fits in less than s bits, the value of this expression is 0.
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* The case where there is a conversion node between the Shift and the And as in:
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* AndLNode(ConvI2L(LShiftI(LHS, s)), RHS)
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* is also handled, but the AndL must be pushed directly in IGVN's worklist because
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* ConvI2L might not have an update when its input change. In this example, the
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* input was a Phi with a dead branch and becomes a LShiftI with the same type.
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*
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* @run main/othervm
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* -XX:CompileOnly=MissedOptWithShiftConvAnd::test
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* -XX:-TieredCompilation -Xbatch
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* -XX:+IgnoreUnrecognizedVMOptions -XX:VerifyIterativeGVN=10
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* MissedOptWithShiftConvAnd
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*/
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/*
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* @test
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* @bug 8320909
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*
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* @run main/othervm MissedOptWithShiftConvAnd
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*/
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public class MissedOptWithShiftConvAnd {
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static long lFld;
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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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test();
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}
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}
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static void test() {
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long l3 = 0;
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int i13 = 1;
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for (l3 = 8; l3 < 200; ++l3) {
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for (int i12 = 1; i12 < 2; i12++) {
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i13 <<= 73;
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}
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}
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for (int i14 = 1; 2 > i14; ++i14) {
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i13 &= l3;
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lFld = i13;
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}
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}
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}
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