1 /*
2 * Copyright (c) 2014, 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
25 /**
26 * @test
27 * @bug 8055494
28 * @summary Add C2 x86 intrinsic for BigInteger::multiplyToLen() method
29 *
30 * @run main/othervm/timeout=600 -XX:-TieredCompilation -Xbatch
31 * -XX:CompileCommand=exclude,TestMultiplyToLen::main
32 * -XX:CompileCommand=option,TestMultiplyToLen::base_multiply,ccstr,DisableIntrinsic,_multiplyToLen
33 * -XX:CompileCommand=option,java.math.BigInteger::multiply,ccstr,DisableIntrinsic,_multiplyToLen
34 * -XX:CompileCommand=inline,java.math.BigInteger::multiply TestMultiplyToLen
35 */
36
37 import java.util.Arrays;
38 import java.util.Random;
39 import java.math.*;
40
41 public class TestMultiplyToLen {
42
43 // Avoid intrinsic by preventing inlining multiply() and multiplyToLen().
44 public static BigInteger base_multiply(BigInteger op1, BigInteger op2) {
45 return op1.multiply(op2);
46 }
47
48 // Generate multiplyToLen() intrinsic by inlining multiply().
49 public static BigInteger new_multiply(BigInteger op1, BigInteger op2) {
50 return op1.multiply(op2);
51 }
52
53 public static boolean bytecompare(BigInteger b1, BigInteger b2) {
54 byte[] data1 = b1.toByteArray();
55 byte[] data2 = b2.toByteArray();
56 if (data1.length != data2.length)
57 return false;
58 for (int i = 0; i < data1.length; i++) {
59 if (data1[i] != data2[i])
60 return false;
61 }
62 return true;
63 }
64
65 public static String stringify(BigInteger b) {
66 String strout= "";
67 byte [] data = b.toByteArray();
68 for (int i = 0; i < data.length; i++) {
69 strout += (String.format("%02x",data[i]) + " ");
70 }
71 return strout;
72 }
73
74 public static void main(String args[]) throws Exception {
75
76 BigInteger oldsum = new BigInteger("0");
77 BigInteger newsum = new BigInteger("0");
78
79 BigInteger b1, b2, oldres, newres;
80
81 Random rand = new Random();
82 long seed = System.nanoTime();
83 Random rand1 = new Random();
84 long seed1 = System.nanoTime();
85 rand.setSeed(seed);
86 rand1.setSeed(seed1);
87
88 for (int j = 0; j < 1000000; j++) {
89 int rand_int = rand1.nextInt(3136)+32;
90 int rand_int1 = rand1.nextInt(3136)+32;
91 b1 = new BigInteger(rand_int, rand);
92 b2 = new BigInteger(rand_int1, rand);
93
94 oldres = base_multiply(b1,b2);
95 newres = new_multiply(b1,b2);
96
97 oldsum = oldsum.add(oldres);
98 newsum = newsum.add(newres);
99
100 if (!bytecompare(oldres,newres)) {
101 System.out.println(b1);
102 System.out.println(b2);
103 System.out.print("mismatch for:b1:" + stringify(b1) + " :b2:" + stringify(b2) + " :oldres:" + stringify(oldres) + " :newres:" + stringify(newres));
104 throw new Exception("Failed");
105 }
106 }
107
108 // Test carry propagation. Multiple carries during bignum
109 // multiplication are rare (especially when using 64-bit
110 // arithmetic) so we have to provoke them deliberately.
111 for (int j = 4; j <= 396; j += 4) {
112 byte[] bytes = new byte[j];
113 Arrays.fill(bytes, (byte)255);
114 b1 = new BigInteger(bytes);
115 b2 = new BigInteger(bytes);
116
117 oldres = base_multiply(b1,b2);
118 newres = new_multiply(b1,b2);
119
120 oldsum = oldsum.add(oldres);
121 newsum = newsum.add(newres);
122
123 if (!bytecompare(oldres,newres)) {
124 System.out.print("mismatch for:b1:" + stringify(b1) + " :b2:" + stringify(b2) + " :oldres:" + stringify(oldres) + " :newres:" + stringify(newres));
125 System.out.println(b1);
126 System.out.println(b2);
127 throw new Exception("Failed");
128 }
129 }
130
131 if (!bytecompare(oldsum,newsum)) {
132 System.out.println("Failure: oldsum:" + stringify(oldsum) + " newsum:" + stringify(newsum));
133 throw new Exception("Failed");
134 } else {
135 System.out.println("Success");
136 }
137 }
138 }