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comparison test/compiler/6921969/TestMultiplyLongHiZero.java @ 1209:e8443c7be117

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6921969: optimize 64 long multiply for case with high bits zero Reviewed-by: never, twisti, kvn, rasbold Contributed-by: Hiroshi Yamauchi <yamauchi@google.com>
author never
date Wed, 03 Feb 2010 15:56:37 -0800
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1207:74c848d437ab 1209:e8443c7be117
1 /*
2 * Copyright 2010 Google, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 /*
26 * @test
27 * @bug 6921969
28 * @summary Tests shorter long multiply sequences when the high 32 bits of long operands are known to be zero on x86_32
29 * @run main/othervm -Xbatch -XX:-Inline -XX:CompileOnly=.testNormal,.testLeftOptimized,.testRightOptimized,.testOptimized,.testLeftOptimized_LoadUI2L,.testRightOptimized_LoadUI2L,.testOptimized_LoadUI2L TestMultiplyLongHiZero
30 */
31
32 // This test must run without any command line arguments.
33
34 public class TestMultiplyLongHiZero {
35
36 private static void check(long leftFactor, long rightFactor, long optimizedProduct, long constantProduct) {
37 long normalProduct = leftFactor * rightFactor; // unaffected by the new optimization
38 if (optimizedProduct != constantProduct || normalProduct != constantProduct) {
39 throw new RuntimeException("Not all three products are equal: " +
40 Long.toHexString(normalProduct) + ", " +
41 Long.toHexString(optimizedProduct) + ", " +
42 Long.toHexString(constantProduct));
43 }
44 }
45
46 private static int initInt(String[] args, int v) {
47 if (args.length > 0) {
48 try {
49 return Integer.valueOf(args[0]);
50 } catch (NumberFormatException e) { }
51 }
52 return v;
53 }
54
55 private static final long mask32 = 0x00000000FFFFFFFFL;
56
57 private static void testNormal(int leftFactor, int rightFactor, long constantProduct) {
58 check((long) leftFactor,
59 (long) rightFactor,
60 (long) leftFactor * (long) rightFactor, // unaffected by the new optimization
61 constantProduct);
62 }
63
64 private static void testLeftOptimized(int leftFactor, int rightFactor, long constantProduct) {
65 check((leftFactor & mask32),
66 (long) rightFactor,
67 (leftFactor & mask32) * (long) rightFactor, // left factor optimized
68 constantProduct);
69 }
70
71 private static void testRightOptimized(int leftFactor, int rightFactor, long constantProduct) {
72 check((long) leftFactor,
73 (rightFactor & mask32),
74 (long) leftFactor * (rightFactor & mask32), // right factor optimized
75 constantProduct);
76 }
77
78 private static void testOptimized(int leftFactor, int rightFactor, long constantProduct) {
79 check((leftFactor & mask32),
80 (rightFactor & mask32),
81 (leftFactor & mask32) * (rightFactor & mask32), // both factors optimized
82 constantProduct);
83 }
84
85 private static void testLeftOptimized_LoadUI2L(int leftFactor, int rightFactor, long constantProduct, int[] factors) {
86 check((leftFactor & mask32),
87 (long) rightFactor,
88 (factors[0] & mask32) * (long) rightFactor, // left factor optimized
89 constantProduct);
90 }
91
92 private static void testRightOptimized_LoadUI2L(int leftFactor, int rightFactor, long constantProduct, int[] factors) {
93 check((long) leftFactor,
94 (rightFactor & mask32),
95 (long) leftFactor * (factors[1] & mask32), // right factor optimized
96 constantProduct);
97 }
98
99 private static void testOptimized_LoadUI2L(int leftFactor, int rightFactor, long constantProduct, int[] factors) {
100 check((leftFactor & mask32),
101 (rightFactor & mask32),
102 (factors[0] & mask32) * (factors[1] & mask32), // both factors optimized
103 constantProduct);
104 }
105
106 private static void test(int leftFactor, int rightFactor,
107 long normalConstantProduct,
108 long leftOptimizedConstantProduct,
109 long rightOptimizedConstantProduct,
110 long optimizedConstantProduct) {
111 int[] factors = new int[2];
112 factors[0] = leftFactor;
113 factors[1] = rightFactor;
114 testNormal(leftFactor, rightFactor, normalConstantProduct);
115 testLeftOptimized(leftFactor, rightFactor, leftOptimizedConstantProduct);
116 testRightOptimized(leftFactor, rightFactor, rightOptimizedConstantProduct);
117 testOptimized(leftFactor, rightFactor, optimizedConstantProduct);
118 testLeftOptimized_LoadUI2L(leftFactor, rightFactor, leftOptimizedConstantProduct, factors);
119 testRightOptimized_LoadUI2L(leftFactor, rightFactor, rightOptimizedConstantProduct, factors);
120 testOptimized_LoadUI2L(leftFactor, rightFactor, optimizedConstantProduct, factors);
121 }
122
123 public static void main(String[] args) {
124 for (int i = 0; i < 100000; ++i) { // Trigger compilation
125 int i0 = initInt(args, 1);
126 int i1 = initInt(args, 3);
127 int i2 = initInt(args, -1);
128 int i3 = initInt(args, 0x7FFFFFFF);
129 test(i0, i1, 3L, 3L, 3L, 3L);
130 test(i0, i2, -1L, -1L, 0xFFFFFFFFL, 0xFFFFFFFFL);
131 test(i0, i3, 0x7FFFFFFFL, 0x7FFFFFFFL, 0x7FFFFFFFL, 0x7FFFFFFFL);
132 test(i1, i2, -3L, -3L, 0x2FFFFFFFDL, 0x2FFFFFFFDL);
133 test(i1, i3, 0x17FFFFFFDL, 0x17FFFFFFDL, 0x17FFFFFFDL, 0x17FFFFFFDL);
134 test(i2, i3, 0xFFFFFFFF80000001L, 0x7FFFFFFE80000001L,
135 0xFFFFFFFF80000001L, 0x7FFFFFFE80000001L);
136 }
137 }
138 }