1 /*
2 * Copyright (c) 2015, 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 import sun.java2d.marlin.FloatMath;
25
26 /*
27 * @test
28 * @summary Check for correct implementation of FloatMath.ceil/floor
29 * @run main CeilAndFloorTests
30 */
31 public class CeilAndFloorTests {
32
33 public static String toHexString(float f) {
34 if (!Float.isNaN(f))
35 return Float.toHexString(f);
36 else
37 return "NaN(0x" + Integer.toHexString(Float.floatToRawIntBits(f)) + ")";
38 }
39
40 public static int test(String testName, float input,
41 float result, float expected) {
42 if (Float.compare(expected, result) != 0) {
43 System.err.println("Failure for " + testName + ":\n" +
44 "\tFor input " + input + "\t(" + toHexString(input) + ")\n" +
45 "\texpected " + expected + "\t(" + toHexString(expected) + ")\n" +
46 "\tgot " + result + "\t(" + toHexString(result) + ").");
47 return 1;
48 }
49 else
50 return 0;
51 }
52
53 public static int test_skip_0(String testName, float input,
54 float result, float expected)
55 {
56 // floor_int does not distinguish +0f and -0f
57 // but it is not critical for Marlin
58 if (Float.compare(expected, result) != 0 && (expected != 0f))
59 {
60 System.err.println("Failure for " + testName + ":\n" +
61 "\tFor input " + input + "\t(" + toHexString(input) + ")\n" +
62 "\texpected " + expected + "\t(" + toHexString(expected) + ")\n" +
63 "\tgot " + result + "\t(" + toHexString(result) + ").");
64 return 1;
65 }
66 else
67 return 0;
68 }
69
70 private static int testCeilCase(float input, float expected) {
71 int failures = 0;
72 // float result:
73 failures += test("FloatMath.ceil_f", input, FloatMath.ceil_f(input), expected);
74 // int result:
75 failures += test("FloatMath.ceil_int", input, FloatMath.ceil_int(input), (int)expected);
76 failures += test("FloatMath.ceil_f (int)", input, (int)FloatMath.ceil_f(input), (int)expected);
77 return failures;
78 }
79
80 private static int testFloorCase(float input, float expected) {
81 int failures = 0;
82 // float result:
83 failures += test ("FloatMath.floor_f", input, FloatMath.floor_f(input), expected);
84 // ignore difference between +0f and -0f:
85 failures += test_skip_0("FloatMath.floor_int", input, FloatMath.floor_int(input), (int)expected);
86 failures += test_skip_0("FloatMath.floor_f (int)", input, (int)FloatMath.floor_f(input), (int)expected);
87 return failures;
88 }
89
90 private static int nearIntegerTests() {
91 int failures = 0;
92
93 float [] fixedPoints = {
94 -0.0f,
95 0.0f,
96 -1.0f,
97 1.0f,
98 -0x1.0p52f,
99 0x1.0p52f,
100 -Float.MAX_VALUE,
101 Float.MAX_VALUE,
102 Float.NEGATIVE_INFINITY,
103 Float.POSITIVE_INFINITY,
104 Float.NaN,
105 };
106
107 for(float fixedPoint : fixedPoints) {
108 failures += testCeilCase(fixedPoint, fixedPoint);
109 failures += testFloorCase(fixedPoint, fixedPoint);
110 }
111
112 for(int i = Float.MIN_EXPONENT; i <= Float.MAX_EXPONENT; i++) {
113 float powerOfTwo = Math.scalb(1.0f, i);
114 float neighborDown = Math.nextDown(powerOfTwo);
115 float neighborUp = Math.nextUp(powerOfTwo);
116
117 if (i < 0) {
118 failures += testCeilCase( powerOfTwo, 1.0f);
119 failures += testCeilCase(-powerOfTwo, -0.0f);
120
121 failures += testFloorCase( powerOfTwo, 0.0f);
122 failures += testFloorCase(-powerOfTwo, -1.0f);
123
124 failures += testCeilCase( neighborDown, 1.0f);
125 failures += testCeilCase(-neighborDown, -0.0f);
126
127 failures += testFloorCase( neighborUp, 0.0f);
128 failures += testFloorCase(-neighborUp, -1.0f);
129 } else {
130 failures += testCeilCase(powerOfTwo, powerOfTwo);
131 failures += testFloorCase(powerOfTwo, powerOfTwo);
132
133 if (neighborDown==Math.rint(neighborDown)) {
134 failures += testCeilCase( neighborDown, neighborDown);
135 failures += testCeilCase(-neighborDown, -neighborDown);
136
137 failures += testFloorCase( neighborDown, neighborDown);
138 failures += testFloorCase(-neighborDown,-neighborDown);
139 } else {
140 failures += testCeilCase( neighborDown, powerOfTwo);
141 failures += testFloorCase(-neighborDown, -powerOfTwo);
142 }
143
144 if (neighborUp==Math.rint(neighborUp)) {
145 failures += testCeilCase(neighborUp, neighborUp);
146 failures += testCeilCase(-neighborUp, -neighborUp);
147
148 failures += testFloorCase(neighborUp, neighborUp);
149 failures += testFloorCase(-neighborUp, -neighborUp);
150 } else {
151 failures += testFloorCase(neighborUp, powerOfTwo);
152 failures += testCeilCase(-neighborUp, -powerOfTwo);
153 }
154 }
155 }
156
157 for(int i = -(0x10000); i <= 0x10000; i++) {
158 float f = (float) i;
159 float neighborDown = Math.nextDown(f);
160 float neighborUp = Math.nextUp(f);
161
162 failures += testCeilCase( f, f);
163 failures += testCeilCase(-f, -f);
164
165 failures += testFloorCase( f, f);
166 failures += testFloorCase(-f, -f);
167
168 if (Math.abs(f) > 1.0) {
169 failures += testCeilCase( neighborDown, f);
170 failures += testCeilCase(-neighborDown, -f+1);
171
172 failures += testFloorCase( neighborUp, f);
173 failures += testFloorCase(-neighborUp, -f-1);
174 }
175 }
176
177 return failures;
178 }
179
180 public static int roundingTests() {
181 int failures = 0;
182 float [][] testCases = {
183 { Float.MIN_VALUE, 1.0f},
184 {-Float.MIN_VALUE, -0.0f},
185 { Math.nextDown(Float.MIN_NORMAL), 1.0f},
186 {-Math.nextDown(Float.MIN_NORMAL), -0.0f},
187 { Float.MIN_NORMAL, 1.0f},
188 {-Float.MIN_NORMAL, -0.0f},
189
190 { 0.1f, 1.0f},
191 {-0.1f, -0.0f},
192
193 { 0.5f, 1.0f},
194 {-0.5f, -0.0f},
195
196 { 1.5f, 2.0f},
197 {-1.5f, -1.0f},
198
199 { 2.5f, 3.0f},
200 {-2.5f, -2.0f},
201
202 { 12.3456789f, 13.0f},
203 {-12.3456789f, -12.0f},
204
205 { Math.nextDown(1.0f), 1.0f},
206 { Math.nextDown(-1.0f), -1.0f},
207
208 { Math.nextUp(1.0f), 2.0f},
209 { Math.nextUp(-1.0f), -0.0f},
210
211 { 0x1.0p22f, 0x1.0p22f},
212 {-0x1.0p22f, -0x1.0p22f},
213
214 { Math.nextDown(0x1.0p22f), 0x1.0p22f},
215 {-Math.nextUp(0x1.0p22f), -0x1.0p22f},
216
217 { Math.nextUp(0x1.0p22f), 0x1.0p22f+1f},
218 {-Math.nextDown(0x1.0p22f), -0x1.0p22f+1f},
219
220 { Math.nextDown(0x1.0p23f), 0x1.0p23f},
221 {-Math.nextUp(0x1.0p23f), -0x1.0p23f-1f},
222
223 { Math.nextUp(0x1.0p23f), 0x1.0p23f+1f},
224 {-Math.nextDown(0x1.0p23f), -0x1.0p23f+1f},
225 };
226
227 for(float[] testCase : testCases) {
228 failures += testCeilCase(testCase[0], testCase[1]);
229 failures += testFloorCase(-testCase[0], -testCase[1]);
230 }
231 return failures;
232 }
233
234 public static void main(String... args) {
235 int failures = 0;
236
237 System.out.println("nearIntegerTests");
238 failures += nearIntegerTests();
239
240 System.out.println("roundingTests");
241 failures += roundingTests();
242
243 if (failures > 0) {
244 System.err.println("Testing {FloatMath}.ceil/floor incurred "
245 + failures + " failures.");
246 throw new RuntimeException();
247 }
248 }
249 }