1 /*
2 * Copyright (c) 2020, 2021, 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"
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" : null;
59
60 if (expectedTestBitInstruction != null) {
61 output.shouldContain(expectedTestBitInstruction);
62 } else {
63 System.err.println("unexpected os.arch");
64 }
65 }
66
67 static final int ITER = 100000; // ~ Tier4CompileThreshold + compilation time
68
69 // dummy volatile variable
70 public static volatile long c = 0;
71
72 // C2 is expected to generate test bit instruction on the test
73 static void tstBitLong(long value) {
74 if (1L == (1L & value)) {
75 c++;
76 } else {
77 c--;
78 }
79 }
80
81 // C2 is expected to generate test bit instruction on the test
82 static void tstBitInt(int value) {
83 if (1 == (1 & value)) {
84 c++;
85 } else {
86 c--;
87 }
88 }
89
90 public static void main(String[] args) throws Exception {
91 if (args.length == 0) {
92 // Fork VMs to check their debug compiler output
93 runTest("tstBitLong");
94 runTest("tstBitInt");
95 }
96 if (args.length > 0) {
97 // We are in a forked VM to execute the named test
98 String testName = args[0];
99 switch (testName) {
100 case "tstBitLong":
101 for (int i = 0; i < ITER; i++) {
102 tstBitLong(i % 2);
103 }
104 break;
105 case "tstBitInt":
106 for (int i = 0; i < ITER; i++) {
107 tstBitInt(i % 2);
108 }
109 break;
110 default:
111 throw new RuntimeException("unexpected test name " + testName);
112 }
113 }
114 }
115 }