1 /*
2 * Copyright (c) 2009, 2011, 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 package marlin;
24
25 import sun.java2d.marlin.FloatMath;
26
27 /*
28 * @test
29 * @summary Check for correct implementation of FloatMath.ceil/floor
30 * @run main CeilAndFloorTests
31 */
32 public class CeilAndFloorTests {
33
34 public static String toHexString(float f) {
35 if (!Float.isNaN(f))
36 return Float.toHexString(f);
37 else
38 return "NaN(0x" + Integer.toHexString(Float.floatToRawIntBits(f)) + ")";
39 }
40
41 public static int test(String testName, float input,
42 float result, float expected) {
43 if (Float.compare(expected, result) != 0) {
44 System.err.println("Failure for " + testName + ":\n" +
45 "\tFor input " + input + "\t(" + toHexString(input) + ")\n" +
46 "\texpected " + expected + "\t(" + toHexString(expected) + ")\n" +
47 "\tgot " + result + "\t(" + toHexString(result) + ").");
48 return 1;
49 }
50 else
51 return 0;
52 }
53
54 public static int test_skip_0(String testName, float input,
55 float result, float expected)
56 {
57 // floor_int does not distinguish +0f and -0f
58 // but it is not critical for Marlin
59 if (Float.compare(expected, result) != 0 && (expected != 0f))
60 {
61 System.err.println("Failure for " + testName + ":\n" +
62 "\tFor input " + input + "\t(" + toHexString(input) + ")\n" +
63 "\texpected " + expected + "\t(" + toHexString(expected) + ")\n" +
64 "\tgot " + result + "\t(" + toHexString(result) + ").");
65 return 1;
66 }
67 else
68 return 0;
69 }
70
71 private static int testCeilCase(float input, float expected) {
72 int failures = 0;
73 // float result:
74 failures += test("FloatMath.ceil_f", input, FloatMath.ceil_f(input), expected);
75 // int result:
76 failures += test("FloatMath.ceil_int", input, FloatMath.ceil_int(input), (int)expected);
77 failures += test("FloatMath.ceil_f (int)", input, (int)FloatMath.ceil_f(input), (int)expected);
78 return failures;
79 }
80
81 private static int testFloorCase(float input, float expected) {
82 int failures = 0;
83 // float result:
84 failures += test ("FloatMath.floor_f", input, FloatMath.floor_f(input), expected);
85 // ignore difference between +0f and -0f:
86 failures += test_skip_0("FloatMath.floor_int", input, FloatMath.floor_int(input), (int)expected);
87 failures += test_skip_0("FloatMath.floor_f (int)", input, (int)FloatMath.floor_f(input), (int)expected);
88 return failures;
89 }
90
91 private static int nearIntegerTests() {
92 int failures = 0;
93
94 float [] fixedPoints = {
95 -0.0f,
96 0.0f,
97 -1.0f,
98 1.0f,
99 -0x1.0p52f,
100 0x1.0p52f,
101 -Float.MAX_VALUE,
102 Float.MAX_VALUE,
103 Float.NEGATIVE_INFINITY,
104 Float.POSITIVE_INFINITY,
105 Float.NaN,
106 };
107
108 for(float fixedPoint : fixedPoints) {
109 failures += testCeilCase(fixedPoint, fixedPoint);
110 failures += testFloorCase(fixedPoint, fixedPoint);
111 }
112
113 for(int i = Float.MIN_EXPONENT; i <= Float.MAX_EXPONENT; i++) {
114 float powerOfTwo = Math.scalb(1.0f, i);
115 float neighborDown = Math.nextDown(powerOfTwo);
116 float neighborUp = Math.nextUp(powerOfTwo);
117
118 if (i < 0) {
119 failures += testCeilCase( powerOfTwo, 1.0f);
120 failures += testCeilCase(-powerOfTwo, -0.0f);
121
122 failures += testFloorCase( powerOfTwo, 0.0f);
123 failures += testFloorCase(-powerOfTwo, -1.0f);
124
125 failures += testCeilCase( neighborDown, 1.0f);
126 failures += testCeilCase(-neighborDown, -0.0f);
127
128 failures += testFloorCase( neighborUp, 0.0f);
129 failures += testFloorCase(-neighborUp, -1.0f);
130 } else {
131 failures += testCeilCase(powerOfTwo, powerOfTwo);
132 failures += testFloorCase(powerOfTwo, powerOfTwo);
133
134 if (neighborDown==Math.rint(neighborDown)) {
135 failures += testCeilCase( neighborDown, neighborDown);
136 failures += testCeilCase(-neighborDown, -neighborDown);
137
138 failures += testFloorCase( neighborDown, neighborDown);
139 failures += testFloorCase(-neighborDown,-neighborDown);
140 } else {
141 failures += testCeilCase( neighborDown, powerOfTwo);
142 failures += testFloorCase(-neighborDown, -powerOfTwo);
143 }
144
145 if (neighborUp==Math.rint(neighborUp)) {
146 failures += testCeilCase(neighborUp, neighborUp);
147 failures += testCeilCase(-neighborUp, -neighborUp);
148
149 failures += testFloorCase(neighborUp, neighborUp);
150 failures += testFloorCase(-neighborUp, -neighborUp);
151 } else {
152 failures += testFloorCase(neighborUp, powerOfTwo);
153 failures += testCeilCase(-neighborUp, -powerOfTwo);
154 }
155 }
156 }
157
158 for(int i = -(0x10000); i <= 0x10000; i++) {
159 float f = (float) i;
160 float neighborDown = Math.nextDown(f);
161 float neighborUp = Math.nextUp(f);
162
163 failures += testCeilCase( f, f);
164 failures += testCeilCase(-f, -f);
165
166 failures += testFloorCase( f, f);
167 failures += testFloorCase(-f, -f);
168
169 if (Math.abs(f) > 1.0) {
170 failures += testCeilCase( neighborDown, f);
171 failures += testCeilCase(-neighborDown, -f+1);
172
173 failures += testFloorCase( neighborUp, f);
174 failures += testFloorCase(-neighborUp, -f-1);
175 }
176 }
177
178 return failures;
179 }
180
181 public static int roundingTests() {
182 int failures = 0;
183 float [][] testCases = {
184 { Float.MIN_VALUE, 1.0f},
185 {-Float.MIN_VALUE, -0.0f},
186 { Math.nextDown(Float.MIN_NORMAL), 1.0f},
187 {-Math.nextDown(Float.MIN_NORMAL), -0.0f},
188 { Float.MIN_NORMAL, 1.0f},
189 {-Float.MIN_NORMAL, -0.0f},
190
191 { 0.1f, 1.0f},
192 {-0.1f, -0.0f},
193
194 { 0.5f, 1.0f},
195 {-0.5f, -0.0f},
196
197 { 1.5f, 2.0f},
198 {-1.5f, -1.0f},
199
200 { 2.5f, 3.0f},
201 {-2.5f, -2.0f},
202
203 { 12.3456789f, 13.0f},
204 {-12.3456789f, -12.0f},
205
206 { Math.nextDown(1.0f), 1.0f},
207 { Math.nextDown(-1.0f), -1.0f},
208
209 { Math.nextUp(1.0f), 2.0f},
210 { Math.nextUp(-1.0f), -0.0f},
211
212 { 0x1.0p22f, 0x1.0p22f},
213 {-0x1.0p22f, -0x1.0p22f},
214
215 { Math.nextDown(0x1.0p22f), 0x1.0p22f},
216 {-Math.nextUp(0x1.0p22f), -0x1.0p22f},
217
218 { Math.nextUp(0x1.0p22f), 0x1.0p22f+1f},
219 {-Math.nextDown(0x1.0p22f), -0x1.0p22f+1f},
220
221 { Math.nextDown(0x1.0p23f), 0x1.0p23f},
222 {-Math.nextUp(0x1.0p23f), -0x1.0p23f-1f},
223
224 { Math.nextUp(0x1.0p23f), 0x1.0p23f+1f},
225 {-Math.nextDown(0x1.0p23f), -0x1.0p23f+1f},
226 };
227
228 for(float[] testCase : testCases) {
229 failures += testCeilCase(testCase[0], testCase[1]);
230 failures += testFloorCase(-testCase[0], -testCase[1]);
231 }
232 return failures;
233 }
234
235 public static void main(String... args) {
236 int failures = 0;
237
238 System.out.println("nearIntegerTests");
239 failures += nearIntegerTests();
240
241 System.out.println("roundingTests");
242 failures += roundingTests();
243
244 if (failures > 0) {
245 System.err.println("Testing {FloatMath}.ceil/floor incurred "
246 + failures + " failures.");
247 throw new RuntimeException();
248 }
249 }
250 }