1 /*
2 * Copyright © 2015 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 */
23
24 #include <stdio.h>
25 #include <stdbool.h>
26 #include <string.h>
27 #include <math.h>
28
29 #include "macros.h"
30 #include "rounding.h"
31
32 #include <gtest/gtest.h>
33
TEST(Rounding,RoundevenFloat)34 TEST(Rounding, RoundevenFloat)
35 {
36 const struct {
37 float input, expected;
38 } float_data[] = {
39 { 0.0, 0.0 },
40 { nextafterf(0.5, 0.0), 0.0 },
41 { 0.5, 0.0 },
42 { nextafterf(0.5, 1.0), 1.0 },
43 { 1.0, 1.0 },
44 { nextafterf(1.5, 1.0), 1.0 },
45 { 1.5, 2.0 },
46 { nextafterf(1.5, 2.0), 2.0 },
47 { 2.0, 2.0 },
48 { nextafterf(2.5, 2.0), 2.0 },
49 { 2.5, 2.0 },
50 { nextafterf(2.5, 3.0), 3.0 },
51 };
52
53 for (unsigned i = 0; i < ARRAY_SIZE(float_data); i++) {
54 float output = _mesa_roundevenf(float_data[i].input);
55 EXPECT_TRUE(memcmp(&float_data[i].expected, &output, sizeof(float)) == 0)
56 << "Subtest " << i << " float value: expected " << float_data[i].expected << " from "
57 << "_mesa_roundevenf(" << float_data[i].input << " but got " << output << "\n";
58 }
59
60 // Test negated values.
61 for (unsigned i = 0; i < ARRAY_SIZE(float_data); i++) {
62 float output = _mesa_roundevenf(-float_data[i].input);
63 float negated_expected = -float_data[i].expected;
64 EXPECT_TRUE(memcmp(&negated_expected, &output, sizeof(float)) == 0)
65 << "Subtest " << i << " float value: expected " << negated_expected << " from "
66 << "_mesa_roundevenf(" << -float_data[i].input << " but got " << output << "\n";
67 }
68 }
69
TEST(Rounding,RoundevenDouble)70 TEST(Rounding, RoundevenDouble)
71 {
72 const struct {
73 double input, expected;
74 } double_data[] = {
75 { 0.0, 0.0 },
76 { nextafter(0.5, 0.0), 0.0 },
77 { 0.5, 0.0 },
78 { nextafter(0.5, 1.0), 1.0 },
79 { 1.0, 1.0 },
80 { nextafter(1.5, 1.0), 1.0 },
81 { 1.5, 2.0 },
82 { nextafter(1.5, 2.0), 2.0 },
83 { 2.0, 2.0 },
84 { nextafter(2.5, 2.0), 2.0 },
85 { 2.5, 2.0 },
86 { nextafter(2.5, 3.0), 3.0 },
87 };
88
89 for (unsigned i = 0; i < ARRAY_SIZE(double_data); i++) {
90 double output = _mesa_roundeven(double_data[i].input);
91 EXPECT_TRUE(memcmp(&double_data[i].expected, &output, sizeof(double)) == 0)
92 << "Subtest " << i << " double value: expected " << double_data[i].expected << " from "
93 << "_mesa_roundeven(" << double_data[i].input << " but got " << output << "\n";
94 }
95
96 // Test negated values.
97 for (unsigned i = 0; i < ARRAY_SIZE(double_data); i++) {
98 double output = _mesa_roundeven(-double_data[i].input);
99 double negated_expected = -double_data[i].expected;
100 EXPECT_TRUE(memcmp(&negated_expected, &output, sizeof(double)) == 0)
101 << "Subtest " << i << " double value: expected " << negated_expected << " from "
102 << "_mesa_roundeven(" << -double_data[i].input << " but got " << output << "\n";
103 }
104 }
105