1 /*
2 * Copyright (c) 2020, 2022, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 package compiler.c2;
25
26 import jdk.test.lib.process.OutputAnalyzer;
27 import jdk.test.lib.process.ProcessTools;
28
29 /*
30 * @test
31 * @bug 8247408
32 * @summary C2 should convert ((var&16) == 16) to ((var&16) != 0) for power-of-two constants
33 * @library /test/lib /
34 *
35 * @requires vm.flagless
36 * @requires os.arch=="aarch64" | os.arch=="amd64" | os.arch == "ppc64le" | os.arch == "riscv64"
37 * @requires vm.debug == true & vm.compiler2.enabled
38 *
39 * @run driver compiler.c2.TestBit
40 */
41 public class TestBit {
42
43 static void runTest(String testName) throws Exception {
44 String className = TestBit.class.getName();
45 String[] procArgs = {
46 "-Xbatch",
47 "-XX:-TieredCompilation",
48 "-XX:+PrintOptoAssembly",
49 "-XX:CompileCommand=compileonly," + className + "::tst*",
50 className, testName};
51
52 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(procArgs);
53 OutputAnalyzer output = new OutputAnalyzer(pb.start());
54
55 String expectedTestBitInstruction =
56 "ppc64le".equals(System.getProperty("os.arch")) ? "ANDI" :
57 "aarch64".equals(System.getProperty("os.arch")) ? "tb" :
58 "amd64".equals(System.getProperty("os.arch")) ? "test" :
59 "riscv64".equals(System.getProperty("os.arch")) ? "andi" : null;
60
61 if (expectedTestBitInstruction != null) {
62 output.shouldContain(expectedTestBitInstruction);
63 } else {
64 System.err.println("unexpected os.arch");
65 }
66 }
67
68 static final int ITER = 100000; // ~ Tier4CompileThreshold + compilation time
69
70 // dummy volatile variable
71 public static volatile long c = 0;
72
73 // C2 is expected to generate test bit instruction on the test
74 static void tstBitLong(long value) {
75 if (1L == (1L & value)) {
76 c++;
77 } else {
78 c--;
79 }
80 }
81
82 // C2 is expected to generate test bit instruction on the test
83 static void tstBitInt(int value) {
84 if (1 == (1 & value)) {
85 c++;
86 } else {
87 c--;
88 }
89 }
90
91 public static void main(String[] args) throws Exception {
92 if (args.length == 0) {
93 // Fork VMs to check their debug compiler output
94 runTest("tstBitLong");
95 runTest("tstBitInt");
96 }
97 if (args.length > 0) {
98 // We are in a forked VM to execute the named test
99 String testName = args[0];
100 switch (testName) {
101 case "tstBitLong":
102 for (int i = 0; i < ITER; i++) {
103 tstBitLong(i % 2);
104 }
105 break;
106 case "tstBitInt":
107 for (int i = 0; i < ITER; i++) {
108 tstBitInt(i % 2);
109 }
110 break;
111 default:
112 throw new RuntimeException("unexpected test name " + testName);
113 }
114 }
115 }
116 }